[Coco] *SLENB behavior?
go4retro at go4retro.com
Wed Nov 9 22:45:01 EST 2016
Though I *think* I know the answer to this question, I'd like to get
more opinions on the behavior of *SLENB. I assumed *SLENB is a signal
to be treated like RESETB. Namely, the signal is weakly pulled high and
any number of devices can pull *SLENB low if needed to offer functionality.
The internal wiring of the 'G' line of the '138 to *SLENB with the 4.7K
pullup suggests this usage, but I've found a cartridge that appears to
hold *SLENB at an active high state, preventing other cartridges from
pulling the line low.
I thought I would check with others, since I am new here.
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