27 Jan
1998
27 Jan
'98
11:18 a.m.
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:
key
3 1
5 4
2
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.
donm(a)cts.com
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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
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see old system support at http://www.psyber.com/~tcj