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Enabling LPT "Nibble" mode on a Tandy 1000

dJOS

Veteran Member
Joined
Apr 5, 2017
Messages
621
Location
Melbourne, Australia
So I've been mucking about with a Covox Clone on my Tandy 1000 EX and the results frankly sucked:


So I've been reading up a bit more on the eccentricities of the Tandy Printer port and found this thread:

http://www.vcfed.org/forum/showthread.php?33992-Tandy-1000-Parallel-Ports-Part-II

which mentions the following:

The Select Input signal can be sent to the card edge on the 1000A, 1000HD, 1000EX, 1000SX, 1000HX, 1000TX, 1000TL, 1000SL, 1000SL/2 via jumper.

I assume this should enable the Nibble mode (basic bi-directional function) from Gen 1 IBM LPT ports but I've been looking thru the EX Technical Reference Manual but I cant see any references to a "jumper" and I cant find much else on this - anyone know exactly what is meant by this?

I know the Select signal is on Pin 16 of the Parallel Chip and it's not connected to anything - I assume one would jumper this pin to another pin on the Tandy Parallel chip but I cant find anything definitive.

Anyone know more about this?
 
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