Development, round II

From: Don Maslin <>
Date: Tue Jan 27 19:18:57 1998

On Tue, 27 Jan 1998, Daniel A. Seagraves wrote:

> I have a pinout of the casette cable somewhere, in fact I have the book with
> the schematics and the dump of the ROMs for the IBM PC... I'll have to go
> dig it out.
> -------
Well, this will give you a good start.
                                                 - don
  The interface to the cassette adapter is through a 5-pin DIN
  connector at the rear of the system unit:
                             3 1
                             5 4
                 1. relay common
                 2. ground
                 3. relay (normally open)
                 4. data in
                 5. data out
 The data output level can be selected to be 0.68v or 75mv by moving
 a jumper on the system board. Writing a zero to bit 3 of the I/O
 port at hex 61 will close the contacts of the relay.
    Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
         Chairman, Dina-SIG of the San Diego Computer Society
       Clinging tenaciously to the trailing edge of technology.
         Sysop - Elephant's Graveyard (CP/M) - 619-454-8412
        see old system support at
Received on Tue Jan 27 1998 - 19:18:57 GMT

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