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 additional functionality.

FDC board features:

• disk controller:
  • Western Digital 1793 floppy disk controller chip
  • SMsC FDC9229T/BT (p. 497) digital data separator -- no adjustments required
  • selectable write precompensation
  • single/double density (FM/MFM), single/double sided
  • supports 4 drives (5¼" or 3½")
• 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 RAM-512 boards
• only 3.9" x 6.3" (100mm x 160mm), 2-layer board with soldermask and silkscreen

(Click on a picture for a larger version.)

Pictures of bare FDC boards. (801-837KB .jpg)

Pictures of assembled FDC boards. (540-1029KB .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, 1MB EEPROM-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.

Last revised 2025-Jun-02 22:50 PDT.
Copyright 2018- David C. Wiens.

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