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{{Infobox computer
{{Infobox computer
| name          = IBM Personal System/2 Model 30
| name          = IBM Personal System/2 Model 30
| logo          = [[File:IBM PS2 Model 30 8086 badge.svg|150px]]
| image        = [[File:IBM PS2 Model 30 system unit.jpg|260px]]
| image        = [[File:IBM PS2 Model 30 system unit.jpg|260px]]
| caption      = IBM PS/2 Model 30 (8530-002 / 021)
| caption      = IBM PS/2 Model 30 (8530)
| developer    = IBM Entry Systems Division, Boca Raton
| developer    = IBM Entry Systems Division, Boca Raton
| manufacturer  = IBM
| manufacturer  = IBM
| type          = Desktop personal computer
| type          = Desktop personal computer
| release date  = April 2, 1987 (Model 30 8086); September 13, 1988 (Model 30 286)
| release date  = 2 April 1987 (Model 30, 8086); 13 September 1988 (Model 30 286)
| discontinued  = c. 1992 (Model 30 286)
| discontinued  = c. 1992
| cpu          = Intel 8086 @ 8 MHz, 0 wait states (Model 30); Intel 80286 @ 10 MHz (Model 30 286)
| cpu          = Intel 8086-2 @ 8 MHz, 0 wait states; Intel 80286 @ 10 MHz on the Model 30 286
| memory        = 640 KB on-board (Model 30); 512 KB – 4 MB (Model 30 286)
| memory        = 640 KB (8086); 512 KB to 4 MB on the board (286)
| storage      = One or two 3.5" 720 KB diskette drives, or one 720 KB diskette + 20 MB / 30 MB hard disk
| storage      = One or two 3.5" diskette drives; optional IBM fixed disk drive with its controller on the drive
| display      = MCGA (Model 30) or VGA (Model 30 286) integrated on planar
| display      = MCGA (8086) or VGA (286), integrated on the planar
| sound        = PC speaker; 1/4" mono earphone jack
| sound        = PC speaker; earphone jack
| dimensions    = 406 W × 397 D × 102 H mm
| os            = IBM PC DOS 3.3 and later; IBM OS/2 1.x on the 286
| weight        = ~8 kg (17.5 lb)
| os            = IBM PC DOS 3.3 and later; IBM OS/2 1.x (Model 30 286)
| predecessor  = [[IBM PC XT (5160)]]
| predecessor  = [[IBM PC XT (5160)]]
| successor    = IBM PS/1; IBM PS/ValuePoint
| successor    = IBM PS/1; IBM PS/ValuePoint
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}}
}}


The '''IBM Personal System/2 Model 30''' (machine type '''8530''') is one of the four original IBM PS/2 systems announced on April 2, 1987 alongside the [[IBM PS/2 Model 50/60|IBM PS/2 Model 50]], [[IBM PS/2 Model 50/60|IBM PS/2 Model 60]] and [[IBM PS/2 Model 70/80|IBM PS/2 Model 80]]. The Model 30 was the lowest-end entry of the original four and was designed to directly replace the IBM PC and [[IBM PC XT (5160)|PC XT]]. Unlike the higher-end original PS/2 models, the Model 30 retains an '''ISA''' expansion bus rather than the new Micro Channel Architecture (MCA), making it electrically compatible with PC/XT and (with the Model 30 286) PC/AT expansion cards.
The '''IBM Personal System/2 Model 30''' (machine type '''8530''') is one of the four original PS/2 systems announced on 2 April 1987, alongside the [[IBM PS/2 Model 50]], [[IBM PS/2 Model 60]] and [[IBM PS/2 Model 80]]. It was the lowest-end of the four and was aimed squarely at replacing the [[IBM PC (5150)|PC]] and [[IBM PC XT (5160)|PC XT]]. Unlike the other three, it keeps an '''ISA''' expansion bus rather than Micro Channel.


The Model 30 was sold in two CPU generations:
Two generations were sold:


* '''Model 30''' (8530-002 / 021) — Intel 8086 at 8 MHz with MCGA video and 8-bit ISA expansion, April 1987 onwards.
* '''Model 30''' (8530-002, -021) &mdash; Intel 8086-2 at 8 MHz with MCGA video and three 8-bit ISA slots, from April 1987.<ref name="ann187048">IBM Announcement Letter 187-048, ''IBM Personal System/2 Model 30 (8530-002, -021)'', 2 April 1987. Gives the "Universal 70W power supply, with internal sensing, for worldwide usage", the 8530-002 (two 720 KB diskette drives) and 8530-021 (20 MB fixed disk with integrated controller plus one 720 KB drive) configurations, and MCGA graphics.</ref>
* '''Model 30 286''' (8530-E01 / E21 / E31 / E41) &mdash; Intel 80286 at 10 MHz with VGA and 16-bit ISA expansion, September 1988 onwards.
* '''Model 30 286''' (8530-E01, E21, E31, E41) &mdash; 80286 at 10 MHz with VGA and 16-bit ISA, from September 1988.<ref name="ann189035">IBM Announcement Letter 189-035, ''Personal System/2 Model 30 286 (8530-E01)''. Gives the 90-watt dual-voltage power supply with a switch on the rear, the 90&ndash;137 Vac and 180&ndash;265 Vac input ranges, the 10 MHz 80286, VGA graphics and the 1.44 MB diskette drive.</ref>


Both generations share the same case mouldings, the same proprietary PS/2 single-cable floppy/hard-drive interface, and the same family of PS/2 (Mini-DIN) keyboard and pointing-device ports. The Model 30 was sold concurrently with the [[IBM PS/2 Model 25|Model 25]] (an all-in-one entry-level variant introduced August 1987) and was followed in the home and education market by the IBM PS/1 line from 1990.
Both share the case, the single-cable drive arrangement and the PS/2 Mini-DIN keyboard and pointing-device ports. The all-in-one [[IBM PS/2 Model 25|Model 25]] is its close relative: the 8086 planars of the two machines use largely the same reference designators.<ref name="at8530planar">Louis Ohland, Tomáš Slavotínek ''et al.'', "8530 Planar (8086)", Ardent Tool of Capitalism, https://www.ardent-tool.com/8530/Planar.html. Gives the "P-PLANAR" P/N 61X8823 designator map, the two Greenock planar variants (P/N 33F4888 and FRU P/N 33F8474 / P/N 33F4871), the ROM image list, the riser card part numbers (61X8864, 61X8910) and its B1 3 V lithium battery (Panasonic BR-2/3A), the note that reference designators are largely consistent across all 8086-based Model 30 and Model 25 planars, and IBM retain tips H007157, H043664, H067282 and H094152.</ref>


== History ==
== Submodels ==


IBM launched the PS/2 family on April 2, 1987 with the Model 30 (8086), Model 50 (80286 MCA), Model 60 (80286 MCA tower) and Model 80 (80386 MCA tower). The Model 30 was positioned at US $2,295 for the entry-level 8530-002 configuration and US $3,495 for the hard-disk equipped 8530-021. By June 1987 IBM's Boca Raton factory was producing approximately 1,000 Model 50s and 800 Model 60s per day, and Model 30 production was at scale alongside; the Model 30 became the dominant entry-level PS/2 in the first two years of the line.
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:95%; text-align:center;"
|+'''IBM PS/2 Model 30 submodels'''
! Submodel !! CPU !! RAM !! Diskette !! Fixed disk !! Video !! Bus
|-
| 8530-002 || 8086-2, 8 MHz || 640 KB || 2 &times; 720 KB || none || MCGA || ISA 8-bit
|-
| 8530-021 || 8086-2, 8 MHz || 640 KB || 1 &times; 720 KB || 20 MB with integrated controller || MCGA || ISA 8-bit
|-
| 8530-E01 || 80286, 10 MHz || 512 KB (4 MB max) || 2 &times; 1.44 MB || none || VGA || ISA 16-bit
|-
| 8530-E21 || 80286, 10 MHz || 1 MB (4 MB max) || 1 &times; 1.44 MB || 20 MB || VGA || ISA 16-bit
|-
| 8530-E31 || 80286, 10 MHz || 1 MB (4 MB max) || 1 &times; 1.44 MB || 30 MB || VGA || ISA 16-bit
|-
| 8530-E41 || 80286, 10 MHz || 1 MB (4 MB max) || 1 &times; 1.44 MB || 45 MB || VGA || ISA 16-bit
|}


The '''Model 30 286''' (8530-E series) was announced on September 13, 1988 to address the Model 30 8086's poor performance in business applications and to give the Model 30 line VGA video and an AT-class 80286 CPU at 10 MHz with 16-bit ISA expansion. It was sold concurrently with the original Model 30 8086 until c. 1990, then continued in the catalogue until 1992 when the PS/2 line was largely replaced by the IBM PS/1 and PS/ValuePoint families.
The 8530-002 and -021 configurations are IBM's own, from the announcement letter.<ref name="ann187048" />


== Submodels ==
== Telling the two generations apart ==


The principal Model 30 submodels are listed below. The 8530-E series is the Model 30 286 variant.
{| class="wikitable styled-table" style="width:95%; text-align:center;"
 
|+'''Model 30 generation identification'''
<templatestyles src="Template:StyledTable/styles.css" />
! Marker !! Model 30 8086 !! Model 30 286
{| class="wikitable styled-table" style="width:70%; text-align:center;"
|-
|+'''IBM PS/2 Model 30 submodels'''
| Machine types || 8530-002, -021 || 8530-E01, E21, E31, E41
! Submodel !! CPU !! RAM !! FDD !! HDD !! Video !! Bus !! Notes
|-
| CPU || Intel 8086-2 at 8 MHz, planar '''U10''' || 80286 at 10 MHz, socket '''ZM36'''
|-
| Chipset || IBM gate arrays || VLSI VL82CPCAT-QC at ZM2&ndash;ZM6
|-
|-
| 8530-002 || Intel 8086 @ 8 MHz || 640 KB || 2 × 720 KB || none || MCGA || ISA 8-bit || Base 1987 configuration, US $2,295
| Video || MCGA || VGA
|-
|-
| 8530-021 || Intel 8086 @ 8 MHz || 640 KB || 1 × 720 KB || 20 MB ST-506 || MCGA || ISA 8-bit || With hard drive, US $3,495
| Riser || three 8-bit ISA slots || 16-bit ISA
|-
|-
| 8530-E01 || Intel 80286 @ 10 MHz || 512 KB (4 MB max) || 2 × 1.44 MB || none || VGA || ISA 16-bit || Model 30 286, 1988
| Extra bus power connector || absent || present (J14, 4-pin)
|-
|-
| 8530-E21 || Intel 80286 @ 10 MHz || 1 MB (4 MB max) || 1 × 1.44 MB || 20 MB || VGA || ISA 16-bit || Model 30 286 with HDD
| Real-time clock || '''NS MM58167AN at U16'''; battery on the '''riser card''' || '''Dallas DS1287''' module at ZM35, cell sealed inside
|-
|-
| 8530-E31 || Intel 80286 @ 10 MHz || 1 MB (4 MB max) || 1 × 1.44 MB || 30 MB || VGA || ISA 16-bit || Model 30 286, larger HDD
| Diskette as shipped || 720 KB || 1.44 MB
|-
|-
| 8530-E41 || Intel 80286 @ 10 MHz || 1 MB (4 MB max) || 1 × 1.44 MB || 45 MB || VGA || ISA 16-bit || Model 30 286, latest configuration
| Power supply || '''70 W''', internal sensing, no voltage switch || '''90 W''', dual voltage, switch on the rear
|}
|}
Sources: the planar designator maps,<ref name="at8530planar" /><ref name="at8530planar286">Louis Ohland, Tomáš Slavotínek ''et al.'', "8530 286 Planar", Ardent Tool of Capitalism, https://www.ardent-tool.com/8530/Planar_286.html. Gives the full 8530-286 planar designator map (VLSI VL82CPCAT-QC chipset at ZM2&ndash;ZM6, VL16C451 at ZM9, DS1287 RTC/CMOS at ZM35, 8042/8742 keyboard controller at ZM33, 286-10 at ZM36), the old PGA and new PLCC planar builds with FRU P/N 34F0046, the J13 password-override jumper, and IBM retain tip H036143.</ref> IBM's announcement letters<ref name="ann187048" /><ref name="ann189035" /> and IBM's ''Technical Reference''.<ref name="tr30">IBM, ''IBM Personal System/2 Model 30 Technical Reference'', January 1987. [[:File:IBM PS2 Model 30 Technical Reference Jan87.pdf]]. Section 1 lists the system board's integrated I/O functions, including "Real-time clock with battery", the I/O address map (real-time clock at hex 00B0&ndash;00BF and 00E0&ndash;00EF), and the diskette and fixed-disk connector pin assignments. Section 3 "Power Supply", pages 3-3 to 3-6, gives the 70 W rating, rail currents, regulation tolerances, under-voltage sense levels, power-good characteristics and the P3/P4 pin assignments.</ref>


== Architecture ==
== Architecture ==
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=== Model 30 8086 planar ===
=== Model 30 8086 planar ===


The Model 30 8086 planar (silkscreened part-numbers in the IBM 23F/72X range) is closely related to the [[IBM PS/2 Model 25|Model 25]] 8086 planar &mdash; the two units share a common ISA + MCGA + PS/2-port architecture, and an 8530 8086 planar can be physically and electrically swapped with an 8525 8086 planar. Key chips:
The board exists as the original "P-PLANAR" P/N 61X8823 and two later Greenock builds, P/N 33F4888 and FRU P/N 33F8474 (P/N 33F4871). The layouts look nothing like each other, but the reference designators are largely consistent &mdash; and consistent with the 8086 [[IBM PS/2 Model 25|Model 25]] planars too.<ref name="at8530planar" />
 
{| class="wikitable styled-table" style="width:95%;"
|+'''Model 30 8086 planar &mdash; principal designators'''
! Designator !! Device
|-
| U10 || Intel 8086-2 CPU, 8 MHz
|-
| U13 || 8087 coprocessor socket
|-
| U8 || Intel P8253-5 timer
|-
| U5 || Inmos IMSG171S RAMDAC
|-
| U16 || '''NS MM58167AN real-time clock'''
|-
| U17, U20 || ROM BIOS (even / odd)
|-
| U18 || NEC uPD765AC diskette controller
|-
| U19 || 8237A DMA controller
|-
| U27 || NS8250AV UART
|-
| J1 / J2 || Mouse / keyboard connectors
|-
| J6 || Riser slot
|-
| J7, J9 || Power connectors
|-
| J11 || '''44-pin fixed-disk connector'''
|-
| J12 || 40-pin diskette connector
|-
| J13 || Dual 30-pin SIMM socket
|-
| F1 / F2 || Mouse and keyboard fuses
|-
| Y1 / Y2 / Y3 || 14.31818 / 25.175 / 48.000 MHz oscillators
|-
| Y4 || '''32.768 kHz crystal''' (real-time clock)
|}


* '''Intel 8086''' (or compatible AMD R80C86) at 8 MHz with zero wait states from on-board DRAM.
'''The 8086 Model 30 does have a real-time clock.''' IBM lists "real-time clock with battery" among the system board's integrated functions, gives it IRQ2 and I/O addresses hex 00B0&ndash;00BF and 00E0&ndash;00EF, and the planar carries the MM58167AN at U16 with its own 32.768 kHz crystal at Y4.<ref name="tr30" /><ref name="at8530planar" /> The '''cell is not on the planar''' &mdash; it is a 3 V lithium Panasonic BR-2/3A at '''B1 on the riser card''' (riser P/N 61X8864 or 61X8910).<ref name="at8530planar" /> That is the part to look for when the clock will not hold time, and it is easy to miss because it is not where a PC-compatible battery usually is.
* '''Three ISA expansion slots''' on a riser card.
* Three IBM-fabricated PS/2 gate-array support chips (72X8202 / 72X8203 / 72X8206 family) handling CPU/bus glue, planar I/O and integrated MCGA video.
* '''Intel P8253-5''' programmable interval timer.
* '''NEC D765AC-2''' floppy disk controller for the PS/2 single-cable diskette interface.
* '''Siemens 8237A''' DMA controller (one, not the dual pair used on the AT).
* '''NS8250AV''' UART for the integrated serial port.
* '''Intel 8042''' keyboard/mouse controller driving the PS/2 (Mini-DIN-6) keyboard and pointing-device ports.
* '''Inmos IMSG171P''' video RAMDAC.
* Two 32 KB EPROM sockets carrying the 64 KB BIOS (split between CBIOS and ABIOS).
* '''ROM BASIC is not provided''' &mdash; the BIOS prompts for a boot diskette if no boot device is found.
* No hardware RTC and no battery-backed CMOS on the original 8086 planar: date and time are set manually at every boot from DOS.
* Single MMK 30-pin SIMM socket for memory expansion to 640 KB; the on-board DRAM provides the lower 512 KB.


The Model 30 8086 PSU is rated '''70 W''', 110/220 VAC switchable, with the proprietary PS/2 single-cable drive power+data combined feed (no Molex). The IBM Model 55 PSU is a drop-in replacement.
Three 62-pin card-edge sockets on the vertical riser extend the I/O channel to three ISA slots.<ref name="tr30" />


=== Model 30 286 planar ===
=== Model 30 286 planar ===


The Model 30 286 planar (8530-E series) is an architectural relative of the Model 25 286 planar &mdash; both use a VLSI '''VL82C100 / 101 / 102 / 103 / 104''' "Popular AT" chipset, the VLSI VL16C451 integrated UART + parallel port, the NEC D765BC FDC, the Intel 8042 keyboard controller, an IBM 15F6864 VGA gate array and the IMSG171P RAMDAC. Key differences from the 8086 planar:
The 286 board uses the VLSI '''VL82CPCAT-QC''' chipset, in a ZM-prefixed designator scheme: ZM2 VL82C100 peripheral controller, ZM3 VL82C102A memory controller, ZM4 VL82C103A address buffer, ZM5 VL82C104 data buffer, ZM6 VL82C101B system controller, ZM9 VL16C451 parallel port and UART, ZM19 uPD765AC-2 diskette controller, ZM33 8042/8742 keyboard controller, '''ZM35 Dallas DS1287''' RTC/CMOS, ZM36 the 286 CPU (PGA on early boards, PLCC later, FRU P/N 34F0046). Power arrives at J7 and J14; '''J13''' is the password-override jumper.<ref name="at8530planar286" />


* '''Intel 80286 @ 10 MHz, 1 wait state to memory'''.
The DS1287 has its lithium cell '''sealed inside the module'''. Replacing it means desoldering and fitting a fresh DS12887 or equivalent &mdash; or cutting into the original case to reach the cell and fitting an external holder.<ref name="at8530planar286" />
* '''Two 30-pin MMK parity SIMM sockets''' &mdash; 512 KB modules each, expandable to 4 MB total.
* '''ISA 16-bit expansion''' on the riser (vs ISA 8-bit on the 8086 Model 30). Three slots.
* '''Auxiliary 4-pin power connector''' supplies +12 V to the 16-bit ISA bus &mdash; this connector is present on the Model 30 286 and absent on the 8086 Model 30.
* '''VGA video''' integrated on the planar with the IBM 15F6864 VGA gate array and IMSG171P RAMDAC, exposed on the standard 15-pin DSUB at the rear.
* '''Battery-backed hardware RTC''' (Dallas DS1287 / DS12887 or equivalent) provides the date/time and stores CMOS configuration. This is the same battery family used in the Model 25 286 and Model 25 SX.
* '''80287 math coprocessor socket''' near the 80286 CPU.


The Model 30 286 PSU is rated '''70 W''' (some sources cite 80 W for late E-series units), 110/220 VAC switchable, with the additional 16-bit ISA aux power connector.
== Memory ==


== Memory ==
* '''Model 30 8086''' &mdash; the machine ships at the 640 KB architectural ceiling, using the dual 30-pin SIMM socket at J13 alongside the on-board DRAM.<ref name="at8530planar" />
* '''Model 30 286''' &mdash; 512 KB minimum, '''4 MB maximum''' on the planar, using 30-pin parity SIMMs with the IBM pinout. Standard PC/AT 30-pin SIMMs may fit physically but are not recognised.


The Model 30 memory subsystem differs between the two generations:
== Display ==


* '''Model 30 8086''': 512 KB on the planar, expandable to '''640 KB''' via one 128 KB IBM memory module (IBM P/N 78X8955 family) at a proprietary 30-pin DIP/SMK RAM socket. The architectural ceiling is the 640 KB IBM PC limit.
The 8086 Model 30 has MCGA, the same integrated subsystem as the 8086 [[IBM PS/2 Model 25|Model 25]]: all the standard CGA modes plus 640 &times; 480 in two colours and 320 &times; 200 in 256 colours, from a 256-entry 18-bit palette driving three 6-bit DACs. It is '''analogue only''' and will not drive a TTL CGA or MDA monitor.
* '''Model 30 286''': 512 KB on the planar with one PS/2-pinout MMK 30-pin parity SIMM socket (or 1 MB factory-fit on -E21 onwards). Two SIMM sockets total; the maximum supported is '''4 MB''' (2 × 2 MB MMK SIMMs). Modules must have the IBM-specific pinout &mdash; standard PC-AT 30-pin SIMMs may fit physically but are not recognised by the BIOS.


The MMK SIMM is similar in geometry to standard 30-pin SIMMs but uses different chip-select routing and is not interchangeable with PC-AT-class parity SIMMs.
The Model 30 286 has full VGA integrated on the planar.


== Display ==
== Storage ==


The Model 30 8086 uses MCGA &mdash; the same integrated video controller as the [[IBM PS/2 Model 25|Model 25]] 8086. MCGA supports the standard CGA modes plus two MCGA-specific modes:
=== Diskette ===


{| class="wikitable styled-table" style="width:100%; text-align:center;"
Power and data reach the drive on a single cable from the planar's 40-pin connector; there are no Molex leads in this machine.<ref name="dosdays30">"IBM PS/2 Model 30", DOS Days, https://www.dosdays.co.uk/computers/IBM%20PS2%20Model%2030/ibm_ps2_model_30.php. Source for the single-cable drive interface with no Molex connectors, the extra 4-pin bus power connector added on the Model 30 286, the statement that the fixed-disk interface is neither ESDI nor standard MFM, the drive caddy, and the Sony 1.44 MB drive compatibility note including the "1.44MB" marking on the eject button.</ref> The 8086 Model 30's BIOS supports 720 KB natively; specific Sony 1.44 MB drives are known to work, and a "1.44MB" marking on the eject button is the usual field identifier.<ref name="dosdays30" /> The Model 30 286 supports 1.44 MB properly.
|+'''Model 30 8086 MCGA video modes'''
! Mode !! Resolution !! Colours !! Refresh
|-
| 0/1 || 40×25 text || 16 || 70 Hz
|-
| 2/3 || 80×25 text || 16 || 70 Hz
|-
| 4/5 || 320×200 || 4 || 70 Hz (CGA-compatible)
|-
| 6 || 640×200 || 2 || 70 Hz (CGA-compatible)
|-
| 0x11 || 640×480 || 2 || 60 Hz (MCGA-specific)
|-
| 0x13 || 320×200 || 256 || 70 Hz (MCGA-specific)
|}


Total palette: 262,144 colours. MCGA drives '''analog''' monitors only (15-pin DSUB connector) and is not compatible with TTL digital CGA or MDA monitors.
PS/2 3.5-inch drives are '''direct drive''' &mdash; the Mitsubishi MF355C specification states a DC brushless motor coupled straight to the spindle at 300 rpm, with no belt.<ref name="mf355c">Mitsubishi Electric, ''3.5 inch Flexible Disk Drive Standard Specifications, MF355C'', document UGD-0527A, February 1987. [[:File:Mitsubishi MF355C 3.5 inch Diskette Drive Specifications (UGD-0527A, Feb 1987).pdf]]. Section 3 states that the disk rotation mechanism uses a DC brushless direct-drive motor to rotate the spindle directly at 300 rpm; the drive has no belt.</ref> What fails on these drives is the surface-mount electrolytics on the logic board and the corrosion they leave behind.<ref name="ibmfiles">[https://www.ibmfiles.com/pages/ps2capacitors.htm PS/2 Surface Mount Capacitors], ibmfiles.com. Community teardown source; documents surface-mount electrolytic failure and pad corrosion on PS/2 Mitsubishi diskette drives and on the DBA hard-drive logic boards, and the technique of fitting through-hole parts to the surface-mount pads.</ref>


The Model 30 286 has '''full VGA''' integrated on the planar &mdash; the same VGA chipset family used in the [[IBM PS/2 Model 25|Model 25]] 286. Modes include all of MCGA's plus the standard VGA 16-colour 640×480 graphics mode and the additional text modes.
=== Fixed disk ===


== Storage and Expansion ==
'''The Model 30's fixed-disk interface is not ST-506, ESDI or any other standard drive interface.''' IBM's ''Technical Reference'' describes the planar's connector as a dedicated I/O channel "for the connection of the IBM Personal System/2 20MB Fixed Disk Drive and Controller, or similar attachment", carrying ordinary I/O-channel signals plus a disk card-select, a disk-installed signal and three address lines that select a register '''inside the controller'''.<ref name="tr30" /> The controller is part of the drive assembly, and it plugs into the '''44-pin''' connector at J11.<ref name="at8530planar" /><ref name="dosdays30" />


* '''Floppy interface''': PS/2 single-cable, carrying both power and data on one ribbon. Same as Model 25. Drives are typically ALPS, Mitsubishi, Sony or YE-Data. The Model 30 8086 BIOS only supports 720 KB diskettes natively, though specific Sony 1.44 MB drives are documented to work. The Model 30 286 supports 1.44 MB natively.
The practical consequence is the one owners run into: the Reference Diskette offers no drive-type list, because there is no drive-type table to choose from. Only drives built for this interface will work, and the drive sits in a caddy.<ref name="dosdays30" />
* '''Hard drive interface''' (Model 30): Proprietary planar-integrated ST-506 controller. Different from later MCA models' ESDI. Setup disk does not offer alternative drive types &mdash; only two or three specific drive part numbers will work. The drive sits in a caddy.
* '''Expansion bus''': Three '''ISA''' slots on a riser card. 8-bit on the Model 30, 16-bit on the Model 30 286.
* '''No MCA''' &mdash; the Model 30 is the only original PS/2 (along with the Model 25) that uses ISA.


== Keyboard and Mouse ==
== Keyboard and Mouse ==


The Model 30 introduces the '''PS/2 keyboard connector''' (Mini-DIN-6) and the PS/2 mouse port. The two connectors are functionally identical at the 8042 controller level but the BIOS expects each device on its designated port; swapping them produces a 301 error at POST.
The Model 30 uses the 6-pin Mini-DIN keyboard and pointing-device connectors. On the 8086 machine the two interfaces are identical and IBM states the keyboard and pointing device may "plug into either of the two 6-pin connectors at the rear of the system".<ref name="tr30" /> The 286 planar uses a discrete 8042/8742 at ZM33 instead.<ref name="at8530planar286" />


Default keyboards are the IBM Space-Saving Keyboard (P/N 1391472, 84-key) or the Enhanced Keyboard (P/N 1391406, 101-key Model M).
Each port is fuse-protected on the planar (F1 and F2, combined into F1 on the later Greenock board).<ref name="at8530planar" /> A '''305''' at POST is a keyboard voltage error and IBM's first suggested FRU is that fuse.<ref name="aterr">"PS/2 Error Codes", Ardent Tool of Capitalism, https://www.ardent-tool.com/trouble/ps2error.html, with the error code listings at https://www.ardent-tool.com/trouble/error_02.html (160&ndash;199) and https://www.ardent-tool.com/trouble/error_04.html (300&ndash;999). Gives the beep codes, the 161/162/163/167/168 battery and clock cluster with IBM's FRU order and the lithium battery caution, the 301&ndash;307 keyboard cluster including 305 "keyboard voltage error" with the keyboard port fuse as first FRU, the diskette cluster including 604 "unsupported drive or cable" and 662/663 wrong drive and media type, the dead-system isolation procedure, and the warning that soft-booting the Reference Diskette can produce false errors.</ref>


== BIOS and Reference Diskette ==
== Power Supply ==


The Model 30 BIOS is the standard PS/2 split CBIOS / ABIOS architecture:
'''Two supplies, 70 W and 90 W. There is no 80 W Model 30 supply.'''


* '''CBIOS''' (Compatible BIOS) for backward-compatible DOS support.
* '''Model 30 8086''' &mdash; IBM's announcement letter specifies a "Universal 70W power supply, with internal sensing, for worldwide usage". There is no voltage selector switch to set.<ref name="ann187048" /> IBM's ''Technical Reference'' gives the 70 W rating along with the rail currents, regulation tolerances, under-voltage sense levels, power-good characteristics and the P3/P4 pin assignments.<ref name="tr30" />
* '''ABIOS''' (Advanced BIOS) for OS/2 protected-mode operation.
* '''Model 30 286''' &mdash; a '''90 W''' dual-voltage supply with a switch on the rear, accepting 90&ndash;137 Vac or 180&ndash;265 Vac.<ref name="ann189035" /> '''Set that switch before the cord goes into the wall.'''<ref name="atpower">Louis Ohland, Tomáš Slavotínek ''et al.'', "8525 / 8530 Power", Ardent Tool of Capitalism, https://www.ardent-tool.com/8530/Power.html. Transcribes IBM's Hardware Maintenance Service data for the 8525 and 8530: the J7 connector measurement limits for the Models 25, 25 SX and 25-286, the minimum under-voltage sense levels, the power-good range and the dead-system isolation procedure, and the warning that the manually-switchable supply must be set before the cord is plugged in.</ref>


There is no built-in SETUP screen. Configuration is performed by booting the model-specific '''IBM PS/2 Reference Diskette'''. The Model 30 8086 and the Model 30 286 have '''different''' Reference Diskettes; they are not interchangeable, and neither is interchangeable with the Model 25, Model 50, or higher-model PS/2 Reference Diskettes.
The supply generates 'power good' after the system has been off for five seconds or more, once the minimum under-voltage sense levels are established: +5 V at +4.5 V, &minus;5 V at &minus;4.3 V, +12 V at +10.8 V and &minus;12 V at &minus;10.2 V. Power Good itself should read +3.5 to +5 V on a working machine; if it does not, strip the machine to the planar and add devices back one at a time, because a short on any of them will hold it down.<ref name="atpower" />


The Reference Diskette includes:
Measurement limits at the P3/P4 connectors, for a machine that is running:<ref name="atpower" />


* '''SETUP''' &mdash; configures memory size, drive types, date/time (Model 30 286 only), display and mouse.
{| class="wikitable styled-table" style="width:80%; text-align:center;"
* '''Advanced Diagnostics''' (entered with Ctrl-A) &mdash; full hardware test suite.
|+'''Model 30 / 30 286 &mdash; P3 / P4 measurement limits'''
! &minus; lead !! + lead !! Minimum !! Maximum
|-
| P3-5 || P4-4 || +4.8 V || +5.2 V
|-
| P4-3 || P3-6 || +4.6 V || +5.5 V
|-
| P4-1 || P3-3 || +11.5 V || +12.6 V
|-
| P3-4 || P4-2 || +10.8 V || +13.2 V
|}


== Power Supply ==
== BIOS and Reference Diskette ==


The Model 30 uses a proprietary '''70 W''' PS/2 power supply with single-cable drive outputs and direct connections to the planar. Power connectors are '''not''' Molex 4-pin. The Model 30 286 adds a 4-pin auxiliary connector for the 16-bit ISA bus.
Split '''CBIOS''' / '''ABIOS''', as on every PS/2. There is no built-in SETUP screen: configuration is done from the model-specific '''Reference Diskette''', which also carries Advanced Diagnostics (Ctrl-A). The 8086 and 286 Reference Diskettes are '''different''' and neither works on the other machine or on a [[IBM PS/2 Model 25|Model 25]].


The IBM Model 55 PSU is a drop-in replacement for the Model 30 PSU.
Cold-boot the Reference Diskette. A warm boot can produce false errors, including a false indication that a power-on password is set.<ref name="aterr" /> On the 286, the power-on password is cleared with the '''J13''' jumper, moved between the first-and-second and second-and-third pin positions.<ref name="gto30286">IBM, ''Personal System/2 Model 30 286 Guide to Operations'', first edition, September 1988. [[:File:IBM PS2 Model 30 286 Guide to Operations.pdf]]. "Cover Removal", page 2-2, and "Power-on Password Reset", pages 3-4 and 3-5, which locate the J13 jumper on the system board and describe moving it between the first-and-second and second-and-third pin positions.</ref>


== General Maintenance ==
== General Maintenance ==


PSU rail checks, RTC battery replacement on the Model 30 286, planar inspection, PS/2 connector care and floppy / hard drive maintenance are documented in [[IBM PS/2 Model 30 Maintenance Guide]].
Opening the machine, the captive push-pin fittings, rail checks, the riser battery and connector care are in [[IBM PS/2 Model 30 Maintenance Guide]].


== Troubleshooting ==
== Troubleshooting ==


Audio beep codes, the complete PS/2 numeric POST error code reference, Reference Diskette procedures, dead-system isolation, ECA recalls and Model-30-specific quirks are documented in [[IBM PS/2 Model 30 Troubleshooting Guide]].
Beep codes, the numeric POST code list, dead-system isolation and the documented IBM retain tips are in [[IBM PS/2 Model 30 Troubleshooting Guide]].


== Capacitor Replacement ==
== Capacitor Replacement ==


Tantalum failure on the planar, PSU electrolytic ageing and the drive logic board are documented in [[IBM PS/2 Model 30 Capacitor Replacement Guide]].
Planar decoupling, the supply, and the diskette and fixed-disk logic boards are in [[IBM PS/2 Model 30 Capacitor Replacement Guide]].


== Gallery ==
== Gallery ==
<gallery mode="packed" heights="220">
<gallery mode="packed" heights="220">
File:IBM PS2 Model 30 system unit.jpg|IBM PS/2 Model 30 (8530) system unit
File:IBM PS2 Model 30 system unit.jpg|IBM PS/2 Model 30 (8530) system unit
File:IBM PS2 Model 30 286 front view.jpg|PS/2 Model 30 286 (8530-E series) front view
File:IBM PS2 Model 30 286 front view.jpg|Model 30 286 front view
File:IBM PS2 Model 30 286 open top.jpg|Model 30 286 with top cover removed
File:IBM PS2 Model 30 286 open top.jpg|Model 30 286 with the cover off
File:IBM PS2 Model 30 8086 badge.svg|Front-panel badge from the 8086 Model 30
File:IBM PS2 Model 30 8086 badge.svg|8086 front badge
File:IBM PS2 Model 30 286 badge.svg|Front-panel badge from the Model 30 286
File:IBM PS2 Model 30 286 badge.svg|Model 30 286 front badge
</gallery>
</gallery>


== Related Pages ==
== References ==


* [[IBM PS/2 Model 30 Maintenance Guide]]
<references />
* [[IBM PS/2 Model 30 Troubleshooting Guide]]
* [[IBM PS/2 Model 30 Capacitor Replacement Guide]]
* [[IBM PS/2 Model 25]] &mdash; sister all-in-one variant
* [[IBM PS/2 Model 50/60|IBM PS/2 Model 50]] &mdash; mid-range MCA 286 desktop
* [[IBM PC XT (5160)]] &mdash; preceded
* (Service Manual: see if a PDF has been uploaded to the wiki under Category:IBM Service Manuals.)


== References ==
== Related Pages ==


* [https://en.wikipedia.org/wiki/IBM_PS/2_Model_30 IBM PS/2 Model 30 &mdash; Wikipedia]. Source for release dates, submodel list, MCGA/VGA video distinction and chronology.
* [[IBM PS/2 Model 30 Maintenance Guide]] &middot; [[IBM PS/2 Model 30 Troubleshooting Guide]] &middot; [[IBM PS/2 Model 30 Capacitor Replacement Guide]]
* [https://www.dosdays.co.uk/computers/IBM%20PS2%20Model%2030/ibm_ps2_model_30.php IBM PS/2 Model 30 &mdash; DOS Days]. Source for submodel pricing, hardware compatibility, ISA bus distinction, PSU rating (70 W), proprietary ST-506 hard drive interface, single Sony 1.44 MB drive compatibility, dimensions (406 × 397 × 102 mm), weight (~8 kg).
* [[IBM PS/2 Model 25]] &mdash; the all-in-one sibling
* [https://www.ardent-tool.com/qtechinfo/GJAN-43VKBR.html IBM PS/2 Model 30 &mdash; Technical Specifications], Ardent Tool of Capitalism (IBM document GJAN-43VKBR). Source for the 8086 / 286 planar architectures, MMK SIMM details, and option-card list.
* [[IBM PS/2 Model 50]] &middot; [[IBM PS/2 Model 60]] &middot; [[IBM PS/2 Model 80]]
* IBM, ''IBM Personal System/2 Hardware Maintenance Reference'' (S52G-9971 series, October 1994). Authoritative source for FRU listings.
* [[IBM PC XT (5160)]] &mdash; the machine it replaced
* '''IBM documentation hosted here:''' [[IBM PS2 Model 30 Technical Reference (January 1987)]] &middot; [[IBM PS2 Model 30 Schematics]] &middot; [[IBM PS2 Model 30 286 Hardware Maintenance Reference]] &middot; [[IBM PS2 Model 30 286 Guide to Operations]]


{{Navbox-IBMComputers|state=expanded}}
{{Navbox-IBMComputers|state=collapsed}}


[[Category:IBM]]
[[Category:IBM]]

Latest revision as of 00:20, 25 September 2026

IBM Personal System/2 Model 30
IBM PS/2 Model 30 (8530)
Specifications
DeveloperIBM Entry Systems Division, Boca Raton
ManufacturerIBM
TypeDesktop personal computer
Released2 April 1987 (Model 30, 8086); 13 September 1988 (Model 30 286)
Discontinuedc. 1992
CPUIntel 8086-2 @ 8 MHz, 0 wait states; Intel 80286 @ 10 MHz on the Model 30 286
Memory640 KB (8086); 512 KB to 4 MB on the board (286)
StorageOne or two 3.5" diskette drives; optional IBM fixed disk drive with its controller on the drive
DisplayMCGA (8086) or VGA (286), integrated on the planar
SoundPC speaker; earphone jack
OS / FirmwareIBM PC DOS 3.3 and later; IBM OS/2 1.x on the 286
PredecessorIBM PC XT (5160)
SuccessorIBM PS/1; IBM PS/ValuePoint
Model no.8530

The IBM Personal System/2 Model 30 (machine type 8530) is one of the four original PS/2 systems announced on 2 April 1987, alongside the IBM PS/2 Model 50, IBM PS/2 Model 60 and IBM PS/2 Model 80. It was the lowest-end of the four and was aimed squarely at replacing the PC and PC XT. Unlike the other three, it keeps an ISA expansion bus rather than Micro Channel.

Two generations were sold:

  • Model 30 (8530-002, -021) — Intel 8086-2 at 8 MHz with MCGA video and three 8-bit ISA slots, from April 1987.[1]
  • Model 30 286 (8530-E01, E21, E31, E41) — 80286 at 10 MHz with VGA and 16-bit ISA, from September 1988.[2]

Both share the case, the single-cable drive arrangement and the PS/2 Mini-DIN keyboard and pointing-device ports. The all-in-one Model 25 is its close relative: the 8086 planars of the two machines use largely the same reference designators.[3]

Submodels

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IBM PS/2 Model 30 submodels
Submodel CPU RAM Diskette Fixed disk Video Bus
8530-002 8086-2, 8 MHz 640 KB 2 × 720 KB none MCGA ISA 8-bit
8530-021 8086-2, 8 MHz 640 KB 1 × 720 KB 20 MB with integrated controller MCGA ISA 8-bit
8530-E01 80286, 10 MHz 512 KB (4 MB max) 2 × 1.44 MB none VGA ISA 16-bit
8530-E21 80286, 10 MHz 1 MB (4 MB max) 1 × 1.44 MB 20 MB VGA ISA 16-bit
8530-E31 80286, 10 MHz 1 MB (4 MB max) 1 × 1.44 MB 30 MB VGA ISA 16-bit
8530-E41 80286, 10 MHz 1 MB (4 MB max) 1 × 1.44 MB 45 MB VGA ISA 16-bit

The 8530-002 and -021 configurations are IBM's own, from the announcement letter.[1]

Telling the two generations apart

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Model 30 generation identification
Marker Model 30 8086 Model 30 286
Machine types 8530-002, -021 8530-E01, E21, E31, E41
CPU Intel 8086-2 at 8 MHz, planar U10 80286 at 10 MHz, socket ZM36
Chipset IBM gate arrays VLSI VL82CPCAT-QC at ZM2–ZM6
Video MCGA VGA
Riser three 8-bit ISA slots 16-bit ISA
Extra bus power connector absent present (J14, 4-pin)
Real-time clock NS MM58167AN at U16; battery on the riser card Dallas DS1287 module at ZM35, cell sealed inside
Diskette as shipped 720 KB 1.44 MB
Power supply 70 W, internal sensing, no voltage switch 90 W, dual voltage, switch on the rear

Sources: the planar designator maps,[3][4] IBM's announcement letters[1][2] and IBM's Technical Reference.[5]

Architecture

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Model 30 8086 planar

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The board exists as the original "P-PLANAR" P/N 61X8823 and two later Greenock builds, P/N 33F4888 and FRU P/N 33F8474 (P/N 33F4871). The layouts look nothing like each other, but the reference designators are largely consistent — and consistent with the 8086 Model 25 planars too.[3]

Model 30 8086 planar — principal designators
Designator Device
U10 Intel 8086-2 CPU, 8 MHz
U13 8087 coprocessor socket
U8 Intel P8253-5 timer
U5 Inmos IMSG171S RAMDAC
U16 NS MM58167AN real-time clock
U17, U20 ROM BIOS (even / odd)
U18 NEC uPD765AC diskette controller
U19 8237A DMA controller
U27 NS8250AV UART
J1 / J2 Mouse / keyboard connectors
J6 Riser slot
J7, J9 Power connectors
J11 44-pin fixed-disk connector
J12 40-pin diskette connector
J13 Dual 30-pin SIMM socket
F1 / F2 Mouse and keyboard fuses
Y1 / Y2 / Y3 14.31818 / 25.175 / 48.000 MHz oscillators
Y4 32.768 kHz crystal (real-time clock)

The 8086 Model 30 does have a real-time clock. IBM lists "real-time clock with battery" among the system board's integrated functions, gives it IRQ2 and I/O addresses hex 00B0–00BF and 00E0–00EF, and the planar carries the MM58167AN at U16 with its own 32.768 kHz crystal at Y4.[5][3] The cell is not on the planar — it is a 3 V lithium Panasonic BR-2/3A at B1 on the riser card (riser P/N 61X8864 or 61X8910).[3] That is the part to look for when the clock will not hold time, and it is easy to miss because it is not where a PC-compatible battery usually is.

Three 62-pin card-edge sockets on the vertical riser extend the I/O channel to three ISA slots.[5]

Model 30 286 planar

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The 286 board uses the VLSI VL82CPCAT-QC chipset, in a ZM-prefixed designator scheme: ZM2 VL82C100 peripheral controller, ZM3 VL82C102A memory controller, ZM4 VL82C103A address buffer, ZM5 VL82C104 data buffer, ZM6 VL82C101B system controller, ZM9 VL16C451 parallel port and UART, ZM19 uPD765AC-2 diskette controller, ZM33 8042/8742 keyboard controller, ZM35 Dallas DS1287 RTC/CMOS, ZM36 the 286 CPU (PGA on early boards, PLCC later, FRU P/N 34F0046). Power arrives at J7 and J14; J13 is the password-override jumper.[4]

The DS1287 has its lithium cell sealed inside the module. Replacing it means desoldering and fitting a fresh DS12887 or equivalent — or cutting into the original case to reach the cell and fitting an external holder.[4]

Memory

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  • Model 30 8086 — the machine ships at the 640 KB architectural ceiling, using the dual 30-pin SIMM socket at J13 alongside the on-board DRAM.[3]
  • Model 30 286 — 512 KB minimum, 4 MB maximum on the planar, using 30-pin parity SIMMs with the IBM pinout. Standard PC/AT 30-pin SIMMs may fit physically but are not recognised.

Display

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The 8086 Model 30 has MCGA, the same integrated subsystem as the 8086 Model 25: all the standard CGA modes plus 640 × 480 in two colours and 320 × 200 in 256 colours, from a 256-entry 18-bit palette driving three 6-bit DACs. It is analogue only and will not drive a TTL CGA or MDA monitor.

The Model 30 286 has full VGA integrated on the planar.

Storage

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Diskette

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Power and data reach the drive on a single cable from the planar's 40-pin connector; there are no Molex leads in this machine.[6] The 8086 Model 30's BIOS supports 720 KB natively; specific Sony 1.44 MB drives are known to work, and a "1.44MB" marking on the eject button is the usual field identifier.[6] The Model 30 286 supports 1.44 MB properly.

PS/2 3.5-inch drives are direct drive — the Mitsubishi MF355C specification states a DC brushless motor coupled straight to the spindle at 300 rpm, with no belt.[7] What fails on these drives is the surface-mount electrolytics on the logic board and the corrosion they leave behind.[8]

Fixed disk

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The Model 30's fixed-disk interface is not ST-506, ESDI or any other standard drive interface. IBM's Technical Reference describes the planar's connector as a dedicated I/O channel "for the connection of the IBM Personal System/2 20MB Fixed Disk Drive and Controller, or similar attachment", carrying ordinary I/O-channel signals plus a disk card-select, a disk-installed signal and three address lines that select a register inside the controller.[5] The controller is part of the drive assembly, and it plugs into the 44-pin connector at J11.[3][6]

The practical consequence is the one owners run into: the Reference Diskette offers no drive-type list, because there is no drive-type table to choose from. Only drives built for this interface will work, and the drive sits in a caddy.[6]

Keyboard and Mouse

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The Model 30 uses the 6-pin Mini-DIN keyboard and pointing-device connectors. On the 8086 machine the two interfaces are identical and IBM states the keyboard and pointing device may "plug into either of the two 6-pin connectors at the rear of the system".[5] The 286 planar uses a discrete 8042/8742 at ZM33 instead.[4]

Each port is fuse-protected on the planar (F1 and F2, combined into F1 on the later Greenock board).[3] A 305 at POST is a keyboard voltage error and IBM's first suggested FRU is that fuse.[9]

Power Supply

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Two supplies, 70 W and 90 W. There is no 80 W Model 30 supply.

  • Model 30 8086 — IBM's announcement letter specifies a "Universal 70W power supply, with internal sensing, for worldwide usage". There is no voltage selector switch to set.[1] IBM's Technical Reference gives the 70 W rating along with the rail currents, regulation tolerances, under-voltage sense levels, power-good characteristics and the P3/P4 pin assignments.[5]
  • Model 30 286 — a 90 W dual-voltage supply with a switch on the rear, accepting 90–137 Vac or 180–265 Vac.[2] Set that switch before the cord goes into the wall.[10]

The supply generates 'power good' after the system has been off for five seconds or more, once the minimum under-voltage sense levels are established: +5 V at +4.5 V, −5 V at −4.3 V, +12 V at +10.8 V and −12 V at −10.2 V. Power Good itself should read +3.5 to +5 V on a working machine; if it does not, strip the machine to the planar and add devices back one at a time, because a short on any of them will hold it down.[10]

Measurement limits at the P3/P4 connectors, for a machine that is running:[10]

Model 30 / 30 286 — P3 / P4 measurement limits
− lead + lead Minimum Maximum
P3-5 P4-4 +4.8 V +5.2 V
P4-3 P3-6 +4.6 V +5.5 V
P4-1 P3-3 +11.5 V +12.6 V
P3-4 P4-2 +10.8 V +13.2 V

BIOS and Reference Diskette

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Split CBIOS / ABIOS, as on every PS/2. There is no built-in SETUP screen: configuration is done from the model-specific Reference Diskette, which also carries Advanced Diagnostics (Ctrl-A). The 8086 and 286 Reference Diskettes are different and neither works on the other machine or on a Model 25.

Cold-boot the Reference Diskette. A warm boot can produce false errors, including a false indication that a power-on password is set.[9] On the 286, the power-on password is cleared with the J13 jumper, moved between the first-and-second and second-and-third pin positions.[11]

General Maintenance

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Opening the machine, the captive push-pin fittings, rail checks, the riser battery and connector care are in IBM PS/2 Model 30 Maintenance Guide.

Troubleshooting

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Beep codes, the numeric POST code list, dead-system isolation and the documented IBM retain tips are in IBM PS/2 Model 30 Troubleshooting Guide.

Capacitor Replacement

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Planar decoupling, the supply, and the diskette and fixed-disk logic boards are in IBM PS/2 Model 30 Capacitor Replacement Guide.

[edit | edit source]
  • IBM PS/2 Model 30 (8530) system unit
    IBM PS/2 Model 30 (8530) system unit
  • Model 30 286 front view
    Model 30 286 front view
  • Model 30 286 with the cover off
    Model 30 286 with the cover off
  • 8086 front badge
    8086 front badge
  • Model 30 286 front badge
    Model 30 286 front badge

References

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  1. ↑ 1.0 1.1 1.2 1.3 IBM Announcement Letter 187-048, IBM Personal System/2 Model 30 (8530-002, -021), 2 April 1987. Gives the "Universal 70W power supply, with internal sensing, for worldwide usage", the 8530-002 (two 720 KB diskette drives) and 8530-021 (20 MB fixed disk with integrated controller plus one 720 KB drive) configurations, and MCGA graphics.
  2. ↑ 2.0 2.1 2.2 IBM Announcement Letter 189-035, Personal System/2 Model 30 286 (8530-E01). Gives the 90-watt dual-voltage power supply with a switch on the rear, the 90–137 Vac and 180–265 Vac input ranges, the 10 MHz 80286, VGA graphics and the 1.44 MB diskette drive.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Louis Ohland, Tomáš Slavotínek et al., "8530 Planar (8086)", Ardent Tool of Capitalism, https://www.ardent-tool.com/8530/Planar.html. Gives the "P-PLANAR" P/N 61X8823 designator map, the two Greenock planar variants (P/N 33F4888 and FRU P/N 33F8474 / P/N 33F4871), the ROM image list, the riser card part numbers (61X8864, 61X8910) and its B1 3 V lithium battery (Panasonic BR-2/3A), the note that reference designators are largely consistent across all 8086-based Model 30 and Model 25 planars, and IBM retain tips H007157, H043664, H067282 and H094152.
  4. ↑ 4.0 4.1 4.2 4.3 Louis Ohland, Tomáš Slavotínek et al., "8530 286 Planar", Ardent Tool of Capitalism, https://www.ardent-tool.com/8530/Planar_286.html. Gives the full 8530-286 planar designator map (VLSI VL82CPCAT-QC chipset at ZM2–ZM6, VL16C451 at ZM9, DS1287 RTC/CMOS at ZM35, 8042/8742 keyboard controller at ZM33, 286-10 at ZM36), the old PGA and new PLCC planar builds with FRU P/N 34F0046, the J13 password-override jumper, and IBM retain tip H036143.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 IBM, IBM Personal System/2 Model 30 Technical Reference, January 1987. File:IBM PS2 Model 30 Technical Reference Jan87.pdf. Section 1 lists the system board's integrated I/O functions, including "Real-time clock with battery", the I/O address map (real-time clock at hex 00B0–00BF and 00E0–00EF), and the diskette and fixed-disk connector pin assignments. Section 3 "Power Supply", pages 3-3 to 3-6, gives the 70 W rating, rail currents, regulation tolerances, under-voltage sense levels, power-good characteristics and the P3/P4 pin assignments.
  6. ↑ 6.0 6.1 6.2 6.3 "IBM PS/2 Model 30", DOS Days, https://www.dosdays.co.uk/computers/IBM%20PS2%20Model%2030/ibm_ps2_model_30.php. Source for the single-cable drive interface with no Molex connectors, the extra 4-pin bus power connector added on the Model 30 286, the statement that the fixed-disk interface is neither ESDI nor standard MFM, the drive caddy, and the Sony 1.44 MB drive compatibility note including the "1.44MB" marking on the eject button.
  7. ↑ Mitsubishi Electric, 3.5 inch Flexible Disk Drive Standard Specifications, MF355C, document UGD-0527A, February 1987. File:Mitsubishi MF355C 3.5 inch Diskette Drive Specifications (UGD-0527A, Feb 1987).pdf. Section 3 states that the disk rotation mechanism uses a DC brushless direct-drive motor to rotate the spindle directly at 300 rpm; the drive has no belt.
  8. ↑ PS/2 Surface Mount Capacitors, ibmfiles.com. Community teardown source; documents surface-mount electrolytic failure and pad corrosion on PS/2 Mitsubishi diskette drives and on the DBA hard-drive logic boards, and the technique of fitting through-hole parts to the surface-mount pads.
  9. ↑ 9.0 9.1 "PS/2 Error Codes", Ardent Tool of Capitalism, https://www.ardent-tool.com/trouble/ps2error.html, with the error code listings at https://www.ardent-tool.com/trouble/error_02.html (160–199) and https://www.ardent-tool.com/trouble/error_04.html (300–999). Gives the beep codes, the 161/162/163/167/168 battery and clock cluster with IBM's FRU order and the lithium battery caution, the 301–307 keyboard cluster including 305 "keyboard voltage error" with the keyboard port fuse as first FRU, the diskette cluster including 604 "unsupported drive or cable" and 662/663 wrong drive and media type, the dead-system isolation procedure, and the warning that soft-booting the Reference Diskette can produce false errors.
  10. ↑ 10.0 10.1 10.2 Louis Ohland, Tomáš Slavotínek et al., "8525 / 8530 Power", Ardent Tool of Capitalism, https://www.ardent-tool.com/8530/Power.html. Transcribes IBM's Hardware Maintenance Service data for the 8525 and 8530: the J7 connector measurement limits for the Models 25, 25 SX and 25-286, the minimum under-voltage sense levels, the power-good range and the dead-system isolation procedure, and the warning that the manually-switchable supply must be set before the cord is plugged in.
  11. ↑ IBM, Personal System/2 Model 30 286 Guide to Operations, first edition, September 1988. File:IBM PS2 Model 30 286 Guide to Operations.pdf. "Cover Removal", page 2-2, and "Power-on Password Reset", pages 3-4 and 3-5, which locate the J13 jumper on the system board and describe moving it between the first-and-second and second-and-third pin positions.
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