Sardis Technologies ST-2900 FDC Board
(This page is still under construction.)
The ST-2900 FDC board is an expansion board that plugs into the
ST-2900 CPU board to provide parallel ports
and a floppy disk controller.
The parallel ports can also connect to other adapter boards to provide
FDC board features:
(Click on a picture for a larger version.)
- disk controller:
- Western Digital
floppy disk controller chip
FDC9229T/BT (p. 497) digital data separator -- no adjustments required
- selectable write precompensation
- single/double density (FM/MFM), single/double sided
- supports 4 drives (5.25" or 3.5")
- parallel ports:
- MOS Technology
6522 VIA chip
- two 8-bit parallel ports, each with 2 control lines
- two 16-bit counter/timers
- 8-bit shift register (in/out)
- large prototyping area
- 60-pin connector plugs into CPU or
- only 3.9" x 6.3" (100mm x 160mm), 2-layer board with soldermask and silkscreen
Pictures of bare boards (1MB .jpg),
and assembled boards (540-560KB .jpg).
||ST-2900 FDC Assembly Instructions and User's Manual.
(4.3MB .pdf scanned image)
||Other notes for the ST-2900 FDC board. Includes addendum
and errata to the manual, etc.
(not available yet)
(??KB .pdf scanned image)
||Centronics Parallel Printer Driver board that connects to one of
the FDC board's parallel ports.
||SASI hard disk drive adapter board that connects to the
FDC board's two parallel ports.
||SCSI hard disk drive adapter board that installs into the
FDC board's prototyping area.
NVRAM/RTC adapter board (non-volatile 1MB SRAM-Disk, 16MB Flash-Disk,
real-time clock) that plugs into the FDC board's parallel port P2.
"FLEX" was a trademark of Technical System Consultants (TSC).
"OS-9" is a registered trademark of Microware LP.
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Last revised 2020-Jun-21 12:49 PDT.
Copyright 2020 by David C. Wiens.