<GALLERY>IBM>3090UP
The IBM System/23 Datamaster is an 8085-based personal computer designed for business, programmed in BASIC, and requiring little specialist attention for installation or operation. It's announcement was nearly contemporaneous with the IBM PC announcement.
The following photos are of the insides of one of my S/23 model 5322 units, which is undergoing repair as of this writing.
A forum page I found lists a few house number -> normal number mappings for some of the ICs in an IBM DisplayWriter, and the list overlaps this machine (unsurprising, since the designs are related). The page is here, and the list of mappings found there is:
- 4178615
- 8085 CPU
- 4178628
- 8255A-5 parallel port.
- 8493077
- 8086 CPU
- 4178619
- 8251A USART
- 4178617
- 8257-5 DMA controller
- 4178623
- 8259A programmable interrupt controller
- 4178625
- 8253-5 programmable interval timer
A far more extensive list of IBM IC house numbers is in the Displaywriter section of Bitsavers.
Some documentation for these beasts is available in the S/23 section of Bitsavers.
- Head of one of the 8" floppy drives
- Head actuator, flywheel, part of a circuit board of one of the 8" floppy drives
- Part of a circuit board of one of the 8" floppy drives
- Video circuitry and tube
- Top of the two 8" floppy drives
- Planar board
- Planar board - lower left corner
- Planar board - lower right corner
- Planar board - upper right corner
- Planar board - upper left corner
- R/W storage card
- Word processing feature card
- Machine update card
- Internal floppy controller card (NEC D765)
