Sardis Technologies DMC Floppy Disk Controller for the CoCo

image of No Halt sticker with red circle and slash (Yes, I now know the red bar
should slope in the other
direction, but I had already
printed a thousand stickers
like this before I was told.)

(This page is still under construction.)

The "No Halt" Dual Mode Controller (DMC) from Sardis Technologies is an enhanced floppy disk controller cartridge for the Radio Shack Color Computer (CoCo).

DMC features:

The DMC controller started shipping in July 1987, and was sold world-wide for several years. And, yes, a few people are still using the DMC, over 30 years later!

Enhanced "no halt" drivers are provided for Microware's OS-9/6809 (and NitrOS-9/6809), both Level I and Level II, for the CoCo 1/2 and CoCo 3. (Requires PAL-4 board installed to use latest version.) The drivers are based on licensed copies of D.P. Johnson's SDisk and SDisk3.

Rainbow magazine first mentioned the DMC controller in an article by Dale L. Puckett, and in the report on the April 1987 RAINBOWfest. The book Tandy's Little Wonder, the Color Computer mentions the DMC controller on page 65, but incorrectly states that Sardis Technologies had dropped out of the CoCo market by 1988.
///////// etc. ////////////

I sold my last remaining inventory of boards, components, and metal cases to a customer in Canada in 2013. If you are interested in purchasing any metal cases or other items, contact me, and I will forward your request to this person.

Detailed background information is provided in The DMC Story.


(Click on a picture for a larger version.)

icon to link to image of DMC advertisement in 68 Micro Journal icon to link to image of DMC advertisement in Rainbow magazine
Advertisements in '68' Micro Journal (1.4MB .png) and Rainbow Magazine (1.7MB .png).
 
icon to link to picture of assembled DMC board icon to link to picture of top side of bare DMC board icon to link to picture of bottom side of bare DMC board
Pictures of assembled DMC board (minus PAL-4 board) (540KB .jpg) and bare DMC board (179-203KB .jpg).
 
icon to link to picture of top side of assembled PAL-4 board icon to link to picture of bottom side of assembled PAL-4 board icon to link to picture of side view of assembled PAL-4 board
Pictures of PAL-4 board (132-156KB .jpg).
 
icon to link to picture of top and bottom pieces of empty DMC case icon to link to picture of assembled DMC used for testing
Picture of DMC metal case (130KB .jpg), and assembled board used for testing over 200 PAL-4 boards (note IC sockets and yellow and blue wires for PAL-4) (556KB .jpg).

icon to link to DMC brochure file Brochure for DMC Floppy Disk Controller.
(2.9MB .pdf scanned image)
icon to link to DMC Hardware Manual file Hardware Manual for DMC Floppy Disk Controller.
(preliminary version dated 1987-Jul-14)
(771KB .pdf scanned image)
icon to link to DMC schematics file Schematics for DMC controller and PAL-4 board.
(last revised 1988-Oct-04)
(171KB .pdf scanned image)
icon to link to DMC Level 1 Software User Manual
   file -- not available yet User's Manual for SDisk3-DMC Software for OS-9 Level I.
(preliminary version)
(not available yet)
(??MB .pdf scanned image)
icon to link to DSK image file for SDisk3-DMC Level 1 DSK image (35T/SS/DD CoCo OS-9 format) of SDisk-DMC Software for OS-9 Level I, as distributed.
(requires the PAL-4 board installed)
(24KB .zip)
icon to link to DMC Level 2 Software User
   Manual file User's Manual for SDisk3-DMC Software for OS-9 Level II.
(preliminary version #3 dated 1988-May-15)
(2.1MB .pdf scanned image)
icon to link to DSK image file for SDisk3-DMC Level 2 DSK image (35T/SS/DD CoCo OS-9 format) of SDisk3-DMC Software for OS-9 Level II, as distributed.
(requires the PAL-4 board installed)
(41KB .zip)
icon to link to file of DMC metal case drawings DMC metal case drawings.
(699KB .pdf)
(Note that a thin fiber washer needs to be placed between the PCB and each standoff to get the right spacing.)
icon to link to file of sample pages of final DMC Level 2 Software User Manual Sample pages from "final" version of "OS-9 Level II SDISK3-DMC Software User's Manual".
(was never completed or released)
(1.2MB .pdf scanned image)

"FLEX" was a trademark of Technical System Consultants (TSC).
"OS-9" is a registered trademark of Microware LP.
"Radio Shack" and "Color Computer" are trademarks of Tandy Corp.
"MS-DOS" is a trademark of Microsoft Corp.

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Last revised 2022-May-20 12:58 PDT.
Copyright 2018-2022 David C. Wiens.


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