Macintosh Performa 640CD DOS Compatible
 | |
| Macintosh Performa 640CD DOS Compatible | |
| Specifications | |
|---|---|
| Manufacturer | Apple Computer, Inc. |
| Type | Personal Computer |
| Released | May 1, 1995 |
| Discontinued | February 1996 |
| Intro price | US$2,199 |
| CPU | Motorola 68040 @ 33 MHz + Intel 80486DX2 @ 66 MHz |
| Memory | 8 MB Mac-side RAM (4 MB built in + 4 MB SIMM), max 52 MB; 4 MB on the DOS card, max 32 MB |
| Storage | 500 MB IDE hard drive, 2× CD-ROM, 1.44 MB floppy drive |
| Display | Supports up to 832×624 at 8-bit color |
| Sound | 8-bit mono input, 8-bit stereo output (16-bit in CD mode) |
| Dimensions | 4.3" H × 16.5" W × 12.6" D (10.95 × 41.95 × 32 cm) |
| Weight | 19 lbs (8.6 kg) |
| OS / Firmware | System 7.1.2P – Mac OS 8.1 / MS-DOS 6.22 / Windows 3.1 |
| Predecessor | Performa 630CD |
| Successor | Power Mac 6100 DOS Compatible |
| Codename | Crusader |
| Model no. | M3076 |
The Macintosh Performa 640CD DOS Compatible is a dual-platform personal computer manufactured by Apple Computer and released on May 1, 1995.[1] It combines the Performa 631CD with an Intel 486DX2 processor card, allowing the computer to run both Mac OS and DOS/Windows applications.
The Performa 640CD DOS Compatible was not sold in the United States and was marketed primarily in international markets.
Dual-Platform Architecture
[edit | edit source]The system features two processors:
- Macintosh: Motorola 68LC040 @ 33 MHz
- DOS/Windows: Intel 486DX2 @ 66 MHz on a PDS card
Users could switch between Mac and DOS environments, with the DOS card appearing as a virtual PC within the Mac OS.
DOS Card Specifications
[edit | edit source]- Intel 486DX2 processor at 66 MHz
- Dedicated RAM (up to 32 MB)
- Shared use of display, keyboard, and mouse
- Includes MS-DOS 6.22 and Windows 3.1[2]
The DOS card occupies the LC PDS slot, leaving the comm and video slots available for other expansion.
Memory and Storage
[edit | edit source]Mac RAM
[edit | edit source]8 MB standard with two 72-pin SIMM sockets for expansion up to 52 MB total.
DOS RAM
[edit | edit source]The DOS card has dedicated RAM expandable up to 32 MB independent of Mac system RAM.
Storage
[edit | edit source]- 500 MB IDE hard drive (partitioned for Mac and DOS)
- 2× Apple CD 300i plus CD-ROM drive
- 1.44 MB SuperDrive floppy (accessible from both environments)
Display and Graphics
[edit | edit source]1 MB of dedicated DRAM for Mac video. The DOS card provides VGA-compatible graphics.
Bundle Contents
[edit | edit source]- Modem
- Apple display (varies by market)
- Keyboard and mouse
- MS-DOS 6.22
- Windows 3.1
- Mac consumer software bundle
General Maintenance
[edit | edit source]For maintenance procedures, refer to the Macintosh LC 630 DOS Compatible page. General maintenance is covered on the Macintosh LC 630 General Maintenance page.
Capacitor Replacement Guide
[edit | edit source]See the Macintosh LC 630 Capacitor Replacement Guide page.
Troubleshooting
[edit | edit source]See the Macintosh LC 630 Troubleshooting page. For DOS-specific issues, refer to Macintosh LC 630 DOS Compatible.
Apple service data
[edit | edit source]Apple treats the Performa 640 DOS-Compatible as the Macintosh LC 630 DOS-Compatible with a different bundle, and says so in terms: "treat LC 630 DOS-Compatible information as applicable to the Performa 640 LC DOS-Compatible unless specified otherwise."[3]
| Item | Apple's figure |
|---|---|
| Macintosh processor | Motorola 68040 at 33 MHz — the full 68040 with its floating-point unit, not the 68LC040 of the plain 630 series |
| DOS processor | Intel 80486DX2 at 66 MHz on a DOS-Compatible board |
| Macintosh memory | Ships with 8 MB on the main logic board (4 MB built in plus a 4 MB DRAM SIMM in one slot); maximum addressable 52 MB (4 MB built in, a 32 MB SIMM in one slot and a 16 MB SIMM in the other) |
| DOS memory | Ships with a 4 MB SIMM; maximum addressable 32 MB on the DOS-Compatible board |
| SIMM type | Both boards require 72-pin, 80 ns or faster SIMMs |
| Processor-direct slot | Occupied. A DOS-Compatible adapter board fills the LC processor-direct slot and provides a DB-15 connector for a PC/AT game controller |
| Hard drive | 500 MB IDE |
| Sound | 8-bit monophonic input; 8-bit stereo output (16-bit in CD mode) |
| Maximum power | 45 W, not including the monitor |
| Case | Height 4.3 in., width 16.5 in., depth 12.6 in.; 17 lb / 19 lb with CD-ROM |
There is also a separate DOS-Compatible sound board in this machine, which Apple lists as its own replaceable module alongside the DOS-Compatible board and the adapter board.[3]
See Also
[edit | edit source]References
[edit | edit source]- ↑ Macintosh Quadra 630, Wikipedia—link(accessed 2026-02-10)
- ↑ Performa 630 and LC 630, Low End Mac—link(accessed 2026-02-10)
- ↑ 3.0 3.1 Apple Computer, LC 630/Quadra 630/Performa 640, Service Source. Hosted here as LC 630/Quadra 630/ Performa 640 Service Source (File:Quadra.lc_630.performa_640.pdf). Specifications chapter.