Restoring an XT - transfer problem

[Michael B. Brutman]

Tony Duell wrote:
>> The MDA port can also be reconfigured as bidirectional, but IIRC, 
>> it's a cut trace and a jumper.  I did that with one and ran it until 
> 
> Sure. As can a lot of the clone printer cards. The mod is to disconnect 
> the OE/ pin of the data latch ('374) from ground and to connect it to the 
> bit 5 (?) output of the control port (nearly always a '174, and nearly 
> always the input of this section is already wired to the D5 line from the 
> ISA bus). 

And the modification works on PCjr parallel printer sidecars too:

http://www.brutman.com/PCjr/parallel_port.html


Mike