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 68LC040 @ 33 MHz + Intel 486DX2 @ 66 MHz |
| Memory | 8 MB Mac RAM + 8 MB DOS RAM (expandable) |
| 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 | Stereo 16-bit sound input/output |
| Dimensions | 4.3" H × 12.6" W × 16.5" D |
| 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.