Editing Macintosh IIvx

{{Infobox computer
| name         = Macintosh IIvx
| image        = [[File:Macintosh_IIvx.jpg|250px]]
| caption      = Macintosh IIvx
| manufacturer = Apple Computer, Inc.
| type         = Desktop Personal Computer
| release date = October 19, 1992
| discontinued = October 21, 1993
| price        = US$2,950 – $3,550
| cpu          = Motorola 68030 @ 32 MHz
| fpu          = Motorola 68882 @ 32 MHz
| memory       = 4–5 MB RAM onboard (expandable to 68 MB)
| storage      = 40 MB, 80 MB, or 230 MB SCSI hard drive
| display      = DB-15 video, 640×480 @ 16-bit (1 MB VRAM)
| sound        = 8-bit stereo output, mono input
| dimensions   = 6.0" H × 13.0" W × 16.5" D (15.2 × 33 × 41.9 cm)
| weight       = 25 lbs (11.3 kg)
| os           = System 7.1 – Mac OS 7.6.1
| predecessor  = [[Macintosh IIci]]
| successor    = [[Macintosh Centris 650]]
| codename     = 
| model        = M1350
}}
The '''Macintosh IIvx''' is a desktop personal computer manufactured by Apple Computer, Inc. from October 1992 to October 1993.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_ii/specs/mac_iivx.html |title=Macintosh IIvx Specs |publisher=EveryMac.com |access-date=2026-02-09}}</ref> The IIvx was the last of the [[Macintosh II family]] and the first Macintosh to accommodate an internal CD-ROM drive.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIvx |title=Macintosh IIvx |publisher=Wikipedia |access-date=2026-02-09}}</ref>

The IIvx was introduced alongside the slower [[Macintosh IIvi]]. Both models use the same high-profile desktop case. The consumer version, the [[Performa 600]], was based on the same architecture.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIvx |title=Macintosh IIvx |publisher=Wikipedia |access-date=2026-02-09}}</ref>

== Development History ==

The IIvx began as a proof-of-concept to demonstrate how an internal CD-ROM drive could be added to a Macintosh. After Apple CEO John Sculley announced a Mac with CD-ROM at MacWorld Tokyo, the IIvx was rushed into production with several design compromises.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIvx |title=Macintosh IIvx |publisher=Wikipedia |access-date=2026-02-09}}</ref>

Apple originally intended the IIvx to be the first Macintosh Centris, but trademark clearance was not completed in time. The Centris name debuted a few months later with 68040-based models.

== Architecture and Processor ==

The Macintosh IIvx uses a '''Motorola MC68030''' microprocessor running at 32 MHz, paired with a '''Motorola 68882''' FPU.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_ii/specs/mac_iivx.html |title=Macintosh IIvx Specs |publisher=EveryMac.com |access-date=2026-02-09}}</ref>

* '''Clock Speed''': 32 MHz
* '''Bus Speed''': 16 MHz
* '''Data Path''': 32-bit
* '''L1 Cache''': 0.5 KB (on-chip)
* '''L2 Cache''': 32 KB
* '''FPU''': Motorola 68882 @ 32 MHz (included)

The 32 MHz CPU runs on a 16 MHz bus, which limits performance. The IIvx is slightly slower than the older [[Macintosh IIci]] in many benchmarks despite the higher clock speed.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIvx |title=Macintosh IIvx |publisher=Wikipedia |access-date=2026-02-09}}</ref> Apple's specification for the serial ports is '''230.4 Kbaud maximum''', or 0.92 Mbit/s with an external clock source<ref name="ssiivx" />. A 57.6 kbit/s limit was previously stated here and is not Apple's figure; the MIDI difficulty on these machines is a clocking problem rather than a ceiling on the port's rate, and no source for a specific number has been found.

The 32K L2 cache distinguishes the IIvx from the IIvi and Performa 600, which lack L2 cache.

== Memory ==

=== RAM Configuration ===

* '''Onboard RAM''': 4 MB or 5 MB (depending on configuration)
* '''SIMM Slots''': 4 × 30-pin
* '''SIMM Speed''': 80 ns minimum
* '''Maximum RAM''': 68 MB (4 MB onboard + 64 MB in SIMMs)
* '''SIMM Installation''': Four identical SIMMs must be installed as a group

=== ROM ===

* '''ROM Size''': 1 MB
* '''ROM Type''': Macintosh ROM

=== VRAM ===

* '''Standard VRAM''': 512 KB or 1 MB (depending on configuration)
* '''Maximum VRAM''': 1 MB (two 512 KB VRAMs)
* '''VRAM Slots''': 2 × VRAM SIMM slots
* '''VRAM Speed''': 100 ns

== Video ==

* '''Video Output''': DB-15 connector
* '''Maximum Resolution''': 640 × 480 pixels
* '''Color Depth (512K VRAM)''': 8-bit (256 colors) at 640×480, 16-bit at 512×384
* '''Color Depth (1 MB VRAM)''': 16-bit (thousands) at 640×480

Additional displays can be connected via NuBus video cards.

== Storage ==

=== Hard Drive ===

* '''Interface''': SCSI (DB-25 external connector)
* '''Standard Capacities''': 40 MB, 80 MB, or 230 MB

=== Floppy Drive ===

* '''Drive Type''': Apple SuperDrive (1.44 MB)
* '''Auto-inject''': Yes

=== CD-ROM Drive ===

* '''Type''': 2X internal (optional, standard on M1373LL/A configuration)
* '''Bay''': Front-accessible 5.25" bay

The IIvx was the first Macintosh to offer an internal CD-ROM drive option.

== Input/Output and Expansion ==

=== Ports ===

* '''ADB Ports''': 2 (Apple Desktop Bus)
* '''Serial Ports''': 2 × Mini DIN-8 RS-422 (Printer and Modem) — limited to 57.6 kbit/s
* '''SCSI Port''': DB-25 connector
* '''Video Port''': DB-15 connector
* '''Audio Output''': 3.5 mm stereo jack
* '''Audio Input''': 3.5 mm mono jack

=== Expansion Slots ===

* '''NuBus slots''': 3, plus what Apple calls an '''accelerator slot''' (not a general-purpose PDS)<ref name="ssiivx" />
* '''Processor Direct Slot (PDS)''': 1
* '''Expansion Bay''': 1 × 5.25" (for CD-ROM)

== Power ==


=== Power — Apple's figures, and the trap in them ===

Apple's Electrical specification for the IIvi, IIvx and Performa 600 is in '''three''' parts, and
they are easy to conflate:<ref name="ssiivx">Apple Computer, ''Macintosh IIvx, Macintosh IIvi, Performa 600 Service Source'' ([[Macintosh IIvx Service Source]], [[:File:Macintosh_iivx.vi.perf_600.pdf]]), Specifications chapter and Additional Procedures → Battery Verification ("if the battery voltage is below 2.8 volts, replace the battery").</ref>

* '''A/C line input: 100–120 VAC, 200 W'''
* '''A/C line output receptacle: 100–240 VAC, 3 A maximum''' — this is the '''switched monitor
  outlet''' on the back, not the machine's own input
* '''DC power: 112 W maximum'''

'''"Input voltage 100–240 V AC" was previously given here. That is the output receptacle's
rating.''' Apple prints the machine's own line input as '''100–120 VAC''' — a domestic figure — so
a 220–240 V IIvx is a different supply, and its primary-side parts are not interchangeable with a
110 V one. Check which board is in front of you before ordering primary-side capacitors.

'''"230 W maximum" was also previously given here and is not Apple's figure''' for any part of this
machine: 200 W is the AC input rating and 112 W the DC output. 230 W is the '''Macintosh IIfx'''
figure.

'''Apple publishes no rail tolerance and no power-supply adjustment for this machine.'''

=== Battery ===

'''3.6 V ½AA lithium; Apple's instruction is to replace it below 2.8 V'''<ref name="ssiivx" /> — measured
on the 10 V DC range. 2.8 V is the IIcx / IIci / IIvi / IIvx / Quadra 700 / SE / SE-30 figure;
3.0 V and 3.2 V belong to other machines and get transplanted between them. Lithium leakage is
neutralised with '''bicarbonate of soda''', not vinegar.


== Case Design ==

The IIvx uses a high-profile desktop case shared with the [[Macintosh IIvi]], [[Performa 600]], [[Macintosh Centris 650]], [[Macintosh Quadra 650]], and [[Power Macintosh 7100]]. The case design continued through the PowerPC era. The logic board can be swapped with a Centris/Quadra 650 board for an upgrade.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIvx |title=Macintosh IIvx |publisher=Wikipedia |access-date=2026-02-09}}</ref>

* '''Dimensions''': 6.0" H × 13.0" W × 16.5" D (15.2 × 33 × 41.9 cm)
* '''Weight''': 25 lbs (11.3 kg)

== General Maintenance ==

Common maintenance concerns include capacitor leakage, PRAM battery failure, and power supply issues.

For cleaning, battery maintenance, and inspection procedures, see the [[Macintosh IIvx General Maintenance]] page.

== Capacitor Replacement Guide ==

The Macintosh IIvx logic board contains surface-mount electrolytic capacitors that leak over time.

For capacitor specifications and procedures, see the [[Macintosh IIvx Capacitor Replacement Guide]].

== Troubleshooting ==

Common issues include startup failures, video problems, slow serial ports, and SCSI errors.

For diagnostics, see the [[Macintosh IIvx Troubleshooting]] page.

== Technical Specifications ==

<templatestyles src="Template:StyledTable/styles.css" />

{| class="wikitable styled-table" style="width:90%; text-align:center;"
! Sub-system !! Specification (Macintosh IIvx, October 1992)
|-
| '''CPU''' || Motorola 68030 @ 32 MHz
|-
| '''FPU''' || Motorola 68882 @ 32 MHz (included)
|-
| '''Bus Speed''' || 16 MHz
|-
| '''ROM''' || 1 MB
|-
| '''RAM''' || 4–5 MB onboard + 4 × 30-pin SIMM slots (68 MB max)
|-
| '''L1 Cache''' || 0.5 KB (on-chip)
|-
| '''L2 Cache''' || 32 KB
|-
| '''Video''' || 640 × 480 @ 8-bit (512K VRAM), 16-bit with 1 MB
|-
| '''Sound''' || 8-bit stereo output, mono input
|-
| '''Storage''' || 40/80/230 MB SCSI HDD, 1.44 MB SuperDrive, optional 2X CD-ROM
|-
| '''Expansion''' || Apple: '''three NuBus slots''' and '''one accelerator slot'''<ref name="ssiivx" />; plus a 5.25-inch bay
|-
| '''Ports''' || 2 × ADB, 2 × Serial (57.6 kbit/s), SCSI, Video, Audio I/O
|}

=== Model Configurations ===
{| class="wikitable styled-table" style="width:85%; text-align:center;"
|+ '''Macintosh IIvx Order Numbers'''
! Order Number !! RAM !! VRAM !! Hard Drive !! CD-ROM !! Price (1992)
|-
| M1355LL/A || 4 MB || 512 KB || 80 MB || No || US$2,949
|-
| M1371LL/A || 4 MB || 512 KB || 230 MB || No || US$3,549
|-
| M1373LL/A || 5 MB || 1 MB || 80 MB || Yes (2X) || US$3,219
|}

=== Identification ===
{| class="wikitable styled-table" style="width:60%;"
|-
! Identifier !! Value
|-
| Apple Model Number || M1350
|-
| Gestalt ID || 48
|}

== See Also ==

* [[Macintosh IIvi]]
* [[Performa 600]]
* [[Macintosh Centris 650]]
* [[Macintosh Quadra 650]]

== References ==
<references />

[[Category:Apple Vintage Computers]]
[[Category:Macintosh II series]]