MITS - 88-DCDD Floppy Disk Controller Boards
This thing looks primitive - a single density 8" FDC on two boards!
However you should remember is was designed at a time before the Western
Digital 179x LSI chips, even before a time when it was agreed all S-100
boards would sit in a card cage that want front to back in a computer box
rather than side to side as was the case for the Altair. Thus the
connections coming out of the side of the boards. Needless to say you
never found this board in other S-100 systems.
The board consisted completely of standard 7400 series
TTL logic. The 18 twisted pair flat cable with two 37 pin connectors
connected the two boards together AND connected to a separate unit
containing the 8" floppy disk(s) and power supply. The board had hard
wired I/O ports (10H to 12H). Altair supplied the boards in kit form along
with a kit to build the 8" Floppy disk unit with its own power supply.
They also supplied some very simple software to checkout your finished
system. The code was listed in Octal!
The detailed construction manual for this board can be
obtained
here.
Other MITS S-100 Boards
1K RAM
4K RAM
4K Dynamic RAM
16K RAM
16K Dynamic RAM
4PIO
8080 CPU VI/RTC
PCI ADC
2K PROM
8K PROM
88-2 SIO
SIO-B
MITS FDC Boards
TurnKey Board
This page was last modified
on
10/25/2013