[Coco] *SLENB behavior?

RETRO Innovations 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.


RETRO Innovations, Contemporary Gear for Classic Systems

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