4 Sep
2015
4 Sep
'15
9:10 p.m.
The idea for using the tristate control for an OC output has been
used many times before.
An example is on the SwyftCard for the Apple 2e.
It needed a OC for the reset as I recall and the PAL used
that trick.
The only possible issue is the limited current drive for older
DTL circuits.
Dwight