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IBM PS/2 Model 80 Maintenance Guide

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Revision as of 00:03, 22 September 2026 by Josh (talk | contribs) (Verified against IBM Technical Reference (Oct 1990) and ardent-tool. Fixed: PSU rail table replaced with IBM service limits and the fabricated -5 V rail deleted - IBM documents three DC outputs only; RTC section rewritten (MC146818A + separate 6 V pack, retain tip H024809 5.5 V threshold), Dallas DS1287/DS12887 claim removed; case opens by two captive coin-slot screws and a hinged side cover, not rear screws and a sliding panel; 225 W is not universal across submodels; planar types corrected...)

This guide covers preventive maintenance and routine service on the IBM PS/2 Model 80 (machine type 8580, all submodels). The Model 80 shares its chassis, side cover, front bezel, drive support structure, power-supply form factor and battery/speaker assembly with the Model 60 and the Model 65 SX, so the mechanical work below applies to those too.[1]

Safety Warning

The tower supply is mains-rectified, and its two primary reservoir capacitors are in series across the rectified mains with a balancing resistor chain. Before opening the supply shell, unplug the mains lead, discharge each reservoir individually through a 1 kΩ / 5 W resistor across its own terminals, and confirm with a meter that both read near zero. Do not probe a powered primary side without an isolation transformer. The supply is universal and voltage-sensing; there is no range selector to set wrongly.[2][3]

There is no CRT in the system unit. The matching IBM displays are serviced separately — see CRT Discharge Procedure.

The machine is heavy. IBM's announcement gives 23.1 kg for the -041 and -071; the technical reference gives 20.6 kg with one fixed disk fitted for the 25 MHz machines. Get help before manhandling one onto a bench.[4][3]

Physical Specification

Model 80 — IBM published figures
Item Value
Width × depth × height 165 mm (318 mm with the feet extended) × 483 mm × 597 mm
Weight 23.1 kg (-041, -071); 20.6 kg with one fixed disk (25 MHz models)
Heat output 350 W/hour with the 225 W supply, 375 W/hour with the 242 W, 390 W/hour with the 250 W
Mains input 100–125 V or 200–240 V, 50–60 Hz, automatically selected
Operating temperature and humidity 15.6 to 32.2 °C, 8 % to 80 % RH
Micro Channel slots Eight. 16/20 MHz planars: three 32-bit and five 16-bit, one with the auxiliary video extension. 25 MHz planar: four 32-bit with Matched Memory Extension and four 16-bit, two with the auxiliary video extension
Drive positions Four 3.5-inch half-height (two accessible) plus one 5.25-inch full-height, which can carry two 3.5-inch half-height drives instead
Keyboard port, maximum allowable current 275 mA
Auxiliary device port, maximum allowable current 300 mA

[3][4][5]

Opening the Tower

No screwdriver is needed.[1]

  1. Power off and unplug everything.
  2. Use a coin or a large flat blade to turn the two large screwheads on the side cover anticlockwise. They are captive and will not come out.
  3. Pivot the side cover outwards on its bottom hinges until the top edge clears the case, then pull it up and out.

Removing the front bezel

  1. Open the side cover.
  2. In the bottom front corner, pull the speaker/battery assembly out horizontally by its frame. Do not pull the battery header out of the planar — if you do, the configuration is gone. Set the loose assembly down in the bottom of the case.
  3. Press the white thermoplastic catch below the grille down and out towards the front. The second catch is hidden behind the black foam around the grille; feel for the inner edge of the foam and push that catch down and forwards too.
  4. With both catches level with the case, grab the bottom edge of the bezel and pull it off. There is a third catch to the right of the power switch.

Unlike the Model 95 bezel, this one has no upper pivots — all three catches grip the frame and pull the bezel onto it.[1]

If the cover lock is engaged and you have no key

Turn the machine upside down, remove the front bezel, loosen the slot retainer for what is now the upper slot and push the slot blank into the case. With a torch you can see the front and rear retaining tabs on the side cover and lever them down with a long thin screwdriver — from the rear through the slot opening, from the front through one of the bezel holes. Shim the first tab once it clears so it cannot snap back. On a measured 8580 the front tab is 71 mm from the front corner and 38 mm in; the rear tab is 91 mm from the back and 38 mm in, both about 6 mm deep — some people drill small access holes at those points instead.[1]

Power Supply Checks

The supply mates with a 15-pin connector on the planar.[6]

8560 / 8565 / 8580 planar power connector
Pin(s) Signal
1, 4, 7, 10, 13 +5 V DC
2, 5, 6, 8, 11, 14 Ground
3 +12 V DC
9 −12 V DC
12 Power Good — +5 V once all voltages are stabilised
15 Hard-drive LED, active high

There is no −5 V rail. IBM's technical reference states plainly that the supply "converts the ac input voltage to three dc output voltages" and lists them as +5 V, +12 V and −12 V for the system board, with +5 V and +12 V for the drives.[3][6]

IBM's service limits, measured with the black lead on pin 2:

Model 60 / 65 / 80 — IBM service limits
Measure Rail Minimum Maximum
Pin 2 to pin 9 −12 V −9.0 V −15.0 V
Pin 2 to pin 3 +12 V +9.0 V +15.0 V
Pin 2 to pin 1 +5 V +3.7 V +6.2 V
Drive connector, B to D +5 V +3.7 V +6.2 V
Drive connector, C to A +12 V +9.0 V +15.0 V

Disconnect the 15-pin planar connector before taking the drive-connector readings. If the voltages are wrong, or the fan is not turning, IBM's instruction is to replace the supply.[6][7]

These are service limits — the window inside which IBM does not replace the supply — and they are deliberately very wide. They are not a statement that +4 V on the 5 V rail is healthy.

Three documented behaviours worth knowing before you diagnose a "dead" machine:[3]

  • Protection latches. A short circuit on any DC output — between two outputs, or between an output and DC return — latches every output into shutdown with no damage to the supply. An internal over-voltage fault latches every output into shutdown before any output exceeds 130 % of nominal.
  • It stays latched. After either shutdown the supply returns to normal only once the fault has been removed and the power switch has been off for at least ten seconds. A tower that clicks and dies, and then will not restart immediately, is doing what it was designed to do.
  • Rails track at power-on. The outputs track within 50 ms of each other measured at their 50 % points. There is no published "Power Good within N milliseconds" figure for this machine, and none should be quoted.

The front-panel power light is driven by Power Good, and an under-voltage on any rail simply de-asserts it. A machine that runs with the light off has a supply that is not meeting its own thresholds.[2]

Before blaming the electronics: roughly half of failed Model 80 supplies failed on a broken power switch, the red ones more often than the white. The same switch was used in IBM 327x and 525x terminals and was a stocked spare.[6]

Removing the supply: take the rear drive carrier out of the drive support structure, unplug any 4-pin drive power leads and the planar power plug, remove the three screws that hold the supply in, and pull it out of the top of the chassis.[6]

Power budget

Maximum load per Micro Channel connector is 1.6 A at +5 V on a 16-bit slot and 2.0 A at +5 V on a 32-bit slot, with 0.175 A at +12 V and 0.040 A at −12 V on both; an internal fixed disk may draw 1.5 A at +5 V and 2.5 A at +12 V per supply connector.[3] IBM's figures for the original fixed disks are 31–39 W for the 44 MB, 70 MB and 115 MB drives, 35–42 W for the 314 MB, and 13–19 W for a 3.5-inch SCSI drive. Assume roughly 7–13 W per IBM adapter. A fully populated tower on a 225 W supply has less headroom than the number suggests.[6]

Battery and Real-Time Clock

The Model 80 does not use a Dallas RTC module. The clock is a Motorola MC146818A soldered to the planar — U187 on the Type 1, U186 on the Type 2, U132 on the Type 3 — with a 32.768 kHz crystal beside it, and the battery is a separate 6 V two-cell lithium pack in the battery/speaker assembly.[8][9][10]

Battery and speaker parts
Item FRU
Battery/speaker assembly 33F5950
Battery 72X8498 — 6 V two-cell lithium pack
Speaker cable 72X8558

The pack is a standard camera battery: CR-P2, also sold as Duracell DL223A, Ever Ready EL223AP, Kodak K223LA and Ray-O-Vac PC223. Its contacts face the rear of the assembly, where they press against the spring clips.[11][12]

Checking the battery

IBM retain tip H024809 gives the numeric threshold. Intermittent 161, 162 and 163 errors can come from a low battery or from a faulty battery/speaker assembly:[1]

  1. Turn off the system.
  2. Remove the battery from the assembly before measuring — measuring it in situ gives a false reading.
  3. Set the meter to a 12 V DC range.
  4. Replace the pack if it reads below 5.5 V.

A clock that does not advance while CMOS contents survive is the classic early warning: as the pack's voltage falls, the RTC's 32 kHz oscillator stops before the CMOS RAM loses its contents. Expect 161 and 163 shortly after.[1]

On the Model 80 the assembly is removed by sliding it towards the open side of the case.[11]

Draining CMOS deliberately

The field procedure is to remove the battery and wait for CMOS to drain, which can take hours. IBM retain tip H104756 gives a faster route: disconnect the battery, then with a meter lead connected to frame ground — the power-supply case will do — drag the lead carefully around each pin of the two configuration modules. This drains CMOS immediately. Reconnect the battery afterwards.[13]

CMOS module positions
Models Positions
-041, -071 (16 MHz) U186 and U187
-081, -111, -121, -161, -311, -321 (20 MHz) U146 and U186
-A16, -A21, -A31 (25 MHz) U132 and U152 (near the blue connector)

Clearing a power-on password

The battery/speaker assembly carries the Clear POP line.[11]

  1. Power off and unplug the mains lead.
  2. If the assembly has pins, short pins 2 and 3 together. If it does not, put a meter lead into connector position 1 and short the other end to frame ground.
  3. With the short in place, power on. This erases the power-on password. Remove the short once POST has finished.

Dust — The Most Underrated Maintenance Job

The supply's fan sits directly over a sensitive part of the planar and draws household dust onto it. That dust is often conductive, and current leaking between IC pins produces lost configuration, a clock showing nonsense after a long power-off, and disk read/write errors — exactly the symptoms people blame on a battery or a drive. On a Model 80 board the ICs under the fan are the 8042 keyboard controller, the MC146818A, the diskette controller, the NS16550 UART, the RTC crystal and sometimes an 8259A.[1]

Strip the machine, blow the supply out with a compressor and a fine nozzle somewhere you do not mind making filthy, then brush and vacuum the board and check between the IC pins. Reassemble, boot the Reference Diskette, and reset the date, time and configuration.[1]

The diskette controller in particular accumulates dirt under the fan and produces 6xx errors that look exactly like a dead drive. Clean it with a cotton bud and alcohol before condemning a drive.[14]

Micro Channel Adapters

Every Micro Channel card carries an ID that the Reference Diskette matches to an Adapter Description File, from which it allocates interrupts, DMA channels and addresses. After changing any card:[13]

  1. Boot the Reference Diskette from a cold start, with the diskette in the drive at power-on.
  2. Select Set Configuration, then Run Automatic Configuration.
  3. Supply the option diskette when prompted so the ADF can be copied onto the working Reference Diskette.
  4. Save and restart.

Clean the card edge fingers and the slot contacts before reseating anything.

Two limits worth knowing:

  • The 8580's SC.EXE supports 64 MB. Two 64 MB memory cards will not work.[13]
  • The IBM SCSI-2 Fast/Wide adapter is not supported on the 8570 or 8580 — the BIOS on these earlier 32-bit systems does not handle it.[13]

Memory

The 8580's planar memory sits on IBM's own memory cards in two connectors — J15 and J16 on the 16/20 MHz planars, J8 and J9 on the 25 MHz. These are not 72-pin SIMM sockets. The board maximum is 4 MB on the 16 and 20 MHz planars and 8 MB on the 25 MHz planar; beyond that, memory goes on Micro Channel adapters to a system ceiling of 16 MB.[15][5][10]

Memory error codes and their actions:[13]

  • 00011000 — system-board parity check. Remove the card in J15 or J8; if the problem goes, replace that card. If not, try the one in J16 or J9. If neither, replace the system board.
  • 00011100 — memory-adapter parity check. Remove adapters one at a time until the error clears.
  • 00021500 — the card in J15 or J8 has failed.
  • 00021600 or 00022100 — the card in J16 or J9 has failed.
  • Intermittent 110 — Advanced Diagnostics loads into the first 256 KB and cannot stress-test it. Swap the two cards and re-run the memory test (IBM retain tip H006554).

The Model 80 deactivates memory in 1 MB blocks. If POST finds an error in the first 512 KB and a second 1 MB block is installed, the addresses are reassigned to it; past the first two blocks, an error code is displayed instead. After the first megabyte, a faulty block is not deactivated automatically — the customer diagnostics on the Reference Diskette do that and reassign the addresses, after which POST ignores it.[13]

Linux users: the 8580 restricts DMA to the lower 16 MB. With more than 16 MB fitted, the ibmmca SCSI driver needs its unchecked_isa_dma flag set.[13]

Diskette Drive

The 25 MHz -Axx machines use the 34-pin style drive; every earlier model uses the card-edge style, P/N 90X6766 with FRU 72X8523. All take power through the interface with no separate power connector. 2.88 MB drives were released for later PS/2 systems and should not be fitted here. The two interfaces are not interchangeable — there are electrical differences that could damage the planar.[14]

  • There is no drive belt. Mitsubishi's specification for the MF355C states a DC brushless direct-drive motor coupled straight to the spindle at 300 rpm. Any maintenance list calling for a replacement belt for this drive is wrong.[16]
  • 162 at POST with the drive dead. During POST the heads are driven off track 0 and back within a fixed window. A sticking head carriage, a dirty track-0 photo-sensor or a detached head damper misses it. ALPS drives have a much higher error rate than the Mitsubishi drives and lose the damper pad glued to the head assembly; the Mitsubishi 355 collects dirt around the read/write head actuator spindle. Recommended lubricant for the head guides and servo spindle is a light ball-gear grease.[14][1]
  • 6xx errors — failed surface-mount electrolytics on the drive's logic board, or dirt on the planar's diskette controller. See IBM PS/2 Model 80 Capacitor Replacement Guide.[1]
  • After a 161 / 163, be patient. The first load of the Reference Diskette can take up to 90 seconds because the BIOS falls back to its lowest transfer rate while it works out what drive is fitted. If it seems to hang, press F1 to force the load; the earlier Model 80 BIOS does not always auto-load even a valid Reference Diskette.[13]
  • Both drive types lack a dust shield over the slot when empty. Keep the flap closed.[1]

Fixed Disks

The 8580's drives are conventional ST-506, ESDI or SCSI units on adapter cards, with their own cabling and 4-pin power leads.[5]

  • 1780 on a -041 — IBM retain tip H064300: verify the fixed disk cables are installed properly before anything else.[1]
  • A 314 MB drive on a -311 that will not come ready — IBM ECA 040 attributes this to a fault in the drive logic board.[13]
  • Will not spin up after long storage — stiction. Unplug, shake the unit vertically, rotate it sharply a few times and try again. Whatever frees it, image the contents immediately.[17]
  • 104xx codes — 010455 and 010456 are controller errors, 010462 a controller seek error, 010464 a drive read error and 010454 a sector-buffer test error.[18]

Engineering Changes

Eight ECAs are documented for the 8580. Two are worth checking on any machine you acquire:[13][10]

  • ECA 031 and ECA 048 — bus mastering. Early planars (FRU 90X7390 below EC C00835, and FRU 33F8415) have a general problem with bus-master adapters, usually seen as a 110 parity error. ECA 048 names the IBM Wizard, Portmaster and XGA, the BICC Isolan, ComTech Channel/2, Metacomp Psconnect, Northern Telecom LanStar/MC, Proteon P1840, Racore 4x16 and Yarc Micro785+ among the affected cards.
  • ECA 051 — 25 MHz memory parity. On an -A16, -A21 or -A31 with 8 MB on the planar showing intermittent OS/2 Trap 0002 or NMI errors, examine the modules at U24 and U34, near memory connectors J8 and J9. If either is marked FCT841 the board qualifies for replacement. Any other marking — F841, 841D, 72F841, 72F841D — is good. Ignore anything printed on the board near the module; only the marking on the module itself counts.

The others are ECA 008 (speaker noise on early -111 and -311 with an 80387 fitted), ECA 011 (386/387 conflict on some -111 and -311 boards), ECA 035 (down-level 8514/A adapters), ECA 040 (314 MB drive not coming ready) and ECA 069 (162 with 601 caused by down-level diskette drives across the early PS/2 range).[13]

Self-Inflicted Faults

  • Pulling the battery header out of the planar while removing the front bezel. Your configuration goes with it. Lift the assembly out by its frame and put it down inside the case.[1]
  • Fitting a second VGA-driving adapter. Some non-IBM graphics adapters drive the VGA signals rather than receiving them. With the on-board VGA present, fitting two such adapters will damage both.[1]
  • Swapping a base frame assembly between models. FRU 64F0157 (the -041 through -321) has a metal back plane needed for EMC and should not be removed; FRU 64F0158 (the 25 MHz machines) has none, because that planar has components on its solder side. They are not interchangeable.[13]
  • Fitting a 34-pin diskette drive to a 20 MHz planar. It has been done, but there are reported electrical differences that could damage the planar.[14]
  • A coin or large flat blade for the captive cover screws — the case itself needs no screwdriver.
  • Security Torx for the power-supply shell.
  • Anti-static strap connected to chassis ground.
  • Digital multimeter, and an ESR meter if you intend to work on drive logic boards.
  • A compressor with a fine nozzle, a soft brush and a vacuum cleaner. On this machine that is a repair tool, not a cosmetic one.
  • Isopropyl alcohol and cotton buds for the diskette controller area.
  • Reference Diskette and the option diskettes for every fitted adapter.
  • A CR-P2 / 72X8498 6 V lithium pack.
  • Fine-tipped soldering iron and wick for drive logic board work.

See also Recommended Tools.

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 60, 65 SX, and 80 — Common Devices, Ardent Tool of Capitalism. Source for the side-cover and front-bezel removal procedures, the locked-case workaround, IBM retain tip H064300 (1780 on the -041 machines), the dust-under-the-fan cause of lost configuration and disk errors with the list of affected ICs, IBM retain tip H024809 on checking the battery for a minimum of 5.5 V DC, the Mitsubishi/ALPS diskette-drive comparison and "killer caps", Alan Douglas's capacitor-replacement notes, and the on-board VGA capabilities and the multiple-VGA-driver warning.
  2. ↑ 2.0 2.1 Eric Schlaepfer ("Tube Time"), IBM PS/2 225 W Power Supply 72X6665 — reverse-engineered schematic, 2024, CC BY-SA 4.0 — hosted on this wiki as File:IBM PS2 225W Power Supply 72X6665 Reverse-Engineered Schematic (Tube Time 2024).pdf. Drawn from a physical 72X6665 / PEC 3978 unit; the only component-level reference published for this supply. IBM did not publish capacitor values for any PS/2 power supply.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 IBM, IBM Personal System/2 Model 80 386 Technical Reference, October 1990 — hosted on this wiki as File:IBM PS2 Model 80 Technical Reference Oct90.pdf. Section 1: "Physical Specifications", "Power Supply", "Outputs", "Output Protection", "Voltage Sequencing", "Component Maximum Current" and "Channel Load Current".
  4. ↑ 4.0 4.1 IBM Announcement Letter 187-051, "IBM Personal System/2 Model 80 (8580-041/071)", 2 April 1987, reproduced at ardent-tool.com. Source for the launch prices, the "eight I/O bus slots with five 16-bit and three 16/32-bit (one 16-bit slot is occupied by the disk controller adapter)", the 225-watt universal power supply, and the physical specifications (165.1 × 482.6 × 597.2 mm, 23.1 kg).
  5. ↑ 5.0 5.1 5.2 IBM product information document GJAN-43WKBR, "IBM PS/2 (Model 80) — Technical specifications", mirrored at ardent-tool.com. IBM's own summary: announce date 2 April 1987; 16 MHz (041, 071), 20 MHz (1xx), 25 MHz (Axx); 3 32-bit slots on the 0xx/1xx and 4 on the Axx; 1–4 MB on the system board in two sockets, expandable to 16 MB with memory options; cache 0 KB except 64 KB on the Axx; 225 W (242 W on the Axx); drive bays 4 × 3.5-inch half-height plus 1 × 5.25-inch full height; and the interface and access time of every fixed disk offered.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 60, 65 SX, and 80 — Power Supply, Ardent Tool of Capitalism. Secondary source reproducing IBM's 15-pin planar power-connector pinout and service test-voltage table for the 8560/8565/8580, the observed supply variants with their FRU numbers and output ratings, the removal procedure, Peter Wendt's note on the high failure rate of the power switch, and Fred Spencer's fixed-disk power-consumption figures.
  7. ↑ IBM, IBM Personal System/2 Hardware Maintenance Manual, S52G-9971-02, October 1994 — hosted on this wiki as File:IBM PS2 HMM S52G-9971 Oct 1994.pdf. Sections "Power Supply Voltage Check", "System-Unit Power Supplies", "Numeric Error Codes" and the Model 50/70 and Model 60/65/80 parts catalogues. Note that the printed Models 50/70 voltage table on page 141 repeats each rail's maximum in the minimum column; the facing 60/65/80 table and ardent-tool's transcription of the same IBM table give the correct minima, which are the figures used here.
  8. ↑ 8580 Type 1 Planar, Ardent Tool of Capitalism. Component-designator map for the 16 MHz planar (FRU 33F8416): J1/J2/J4 32-bit Micro Channel slots with Matched Memory Extension, J3/J5/J7/J8 16-bit slots, J6 16-bit slot with auxiliary video extension, J15 and J16 memory-expansion connectors, J18 battery/speaker connector, U72 72X8287ESD VGA controller with eight OKI M41464-12 64 K × 4 video DRAMs, U187 Motorola MC146818A RTC and U186 2 K × 8 configuration SRAM.
  9. ↑ 8580 Type 2 Planar, Ardent Tool of Capitalism. Component-designator map for the 20 MHz planar (FRU 33F8506 / 92F0756 / 92F0767, P/N 90X7390): the same slot arrangement as the Type 1, J15 and J16 memory-expansion connectors, J18 battery/speaker connector, U87 72X8287 VGA with eight TI TMS4464FML-12 video DRAMs, U131 Intel 386DX-20, U186 MC146818A RTC and U146 configuration SRAM. Also links IBM's Model 80 planar schematics.
  10. ↑ 10.0 10.1 10.2 8580 Type 3 Planar, Ardent Tool of Capitalism. Component-designator map for the 25 MHz planar (FRU 34F0022 / 85F0046): J10–J13 32-bit slots with Matched Memory Extension, J6/J7 16-bit slots with auxiliary video extension, J14/J15 16-bit slots, J8 and J9 memory-expansion connectors, J19 battery/speaker connector, F2/F3/F4 1 A, 1.5 A and 2.0 A fuses, U54 Intel 82385-25 cache controller with eight Mitsubishi M5M5178P-33 8 K × 8 SRAMs, U96 80386DX-25 and U132 MC146818AFN RTC. Also carries the full text of IBM ECA 051.
  11. ↑ 11.0 11.1 11.2 Battery/Speaker Assembly, Ardent Tool of Capitalism. Source for the assembly FRU 33F5950, the battery FRU 72X8498, both connector pinouts (speaker data, ground, +6 V battery, Clear POP) and the power-on-password clearing procedure for Models 50, 50 Z, 60, 65 SX, 70 and 80.
  12. ↑ PS/2 Batteries, Ardent Tool of Capitalism, based on content by Bob Eager and Peter H. Wendt. Cross-reference of PS/2 models to battery types: the Model 70 and the Model 80 both take FRU 72X8498, a 6 V two-cell lithium pack equivalent to a CR-P2 / DL223A / EL223AP / K223LA / PC223 camera battery.
  13. ↑ 13.00 13.01 13.02 13.03 13.04 13.05 13.06 13.07 13.08 13.09 13.10 13.11 8580 Common Devices, Ardent Tool of Capitalism. Source for Fred Spencer's submodel table (processor speed, disk interface and capacity, and the 32-bit/16-bit/AVE slot split for every 8580), IBM retain tip H104756 on draining CMOS by grounding the configuration modules, the memory-error codes and memory activation/deactivation behaviour, Peter Wendt's summary of Model 80 ECAs 008, 011, 031, 035, 040, 048, 051 and 069, retain tip H006554 on intermittent 110 parity errors, the 64 MB configuration limit, and retain tip H021673 on the two non-interchangeable base frame assemblies.
  14. ↑ 14.0 14.1 14.2 14.3 8580 Diskette Drives, Ardent Tool of Capitalism, content by Fred Spencer and Al Savage. Source for the PS/2 diskette-drive part numbers (P/N 90X6766, FRU 72X8523 card-edge; FRU 64F0162 pin-interface), for Al Savage's teardown of a Mitsubishi MF355W-99M3 identifying five failed surface-mount electrolytics — two 22 µF/16 V, one 1 µF/50 V and two 0.22 µF/50 V — for the diskette-controller dirt problem under the power-supply fan, and for Peter Wendt's list of mechanical causes of a 162 at POST.
  15. ↑ 8580 Planar Memory, Ardent Tool of Capitalism. Catalogue of the IBM planar memory cards used in the 8580's two on-board memory-expansion connectors, with part numbers, DRAM complements and the connector pinout. These cards are specific to the Model 80 and are not 72-pin SIMMs.
  16. ↑ Mitsubishi Electric, 3.5-inch Diskette Drive MF355C Specifications, UGD-0527A, February 1987 — hosted on this wiki as File:Mitsubishi MF355C 3.5 inch Diskette Drive Specifications (UGD-0527A, Feb 1987).pdf. The drive uses a DC brushless, direct-drive motor coupled straight to the spindle at 300 rpm. There is no belt in this drive.
  17. ↑ Known Problems — Experience, RETAIN Tips, ECAs, Ardent Tool of Capitalism. Source for Peter Wendt's account of hard-disk stiction and the recovery options.
  18. ↑ PS/2 Error Codes and the linked code tables 160–199, 300–999 and 10000–11999, Ardent Tool of Capitalism. Secondary source; the tables reproduce IBM's own symptom-to-FRU lists.


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