Essentially this is Power Mac 8100 with a few modifications. First of all, while almost all of 8100 Macs came with a 2MB video board in its PDS slot, this one has no video board, only a built-in circuitry is used. To make the system stable, a PDS terminator board should be put into PDS slot. The 110MHz (in earlier versions 80MHz) PowerPC 601 CPU was sufficient for powering services for a small Macs network in 1994 when it was released. The hard drives started from 500MB to 2GB. Built-in RAM was still 8MB, expandable by 8 72-pin SIMMs. The network could be built using AAUI and transceivers or a network board in NuBus slot. It came with System 7.5 line, probably with some server extensions.
|CPU:||PowerPC 601 80MHz
|RAM:||136MB (4x32 SIMM)
|RAM Type:||8x72-pin SIMM|
|Hard disk:||2GB SCSI, 3.5" SL
Also delivered with 500MB
|Floppy drives:||1 1.4M 3.5"|
|Other drives:||Apple SCSI CD-ROM drive|
|Graphics:||1MB VRAM, built-in, Apple's "high-density" connector.|
|Display:||External, 45-pin HD45 connector|
|Dedicated OS:||Mac System 7.1|
|Maximum OS:||Mac System 9.1|
- 4 SIMMs for RAM Expansion
- 4 VRAM SIMMs
- 3 NuBus slots
- PDS slot
|Connectors:|| - 45-pin video
- External SCSI port (DB25)
- AAUI network card connector
- 2 serial ports (RS-422) for modem and printer)
- ADB connector for keyboard and mouse
- Sound output
- Microphone in
Origin of my unit is not known. Although I suspected a graphics studio, there were stickers all around referring to different companies, so it is possible that it was passed between different second-hand computer retailers. It came in a quite bad condition, now it is restored into more or less working state but it's still incomplete - some front covers are missing.
Although the mainboard has been repaired, the termination
board for multimedia expansion slot is missing so it is not stable and
sometimes it does not even boot to desktop. Usually a multimedia/video
board is present and it terminates a system bus. Otherwise, a board with
capacitors and resistors on some lines is present to make bus stable.
According to some sources, running with PDS slot unpopulated may even
damage the mainboard.
https://www.macgurus.com/products/motherboards/mbppc8100.php - Power Mac 8100 mainboard
https://support.apple.com/kb/SP266 - Apple's technical specifications