adamd@rhi.hi.is (Adam David) (12/17/90)
What I really meant was: Is it sufficient to put a diode on a TTL output in order to pull /DTACK low on newly-defined address regions (wire-AND)? Is this enough to stop GLUE from generating /BERR on normally non-existent addresses? What is the upper limit for the number of such /DTACK ANDed inputs to guarantee correct operation? I see no reason why it shouldn't work for small numbers unless GLUE is actively banning larger addressing ranges. Have any spec. sheets been made available for the custom Atari chips or do we still have to guess and make mistakes, not knowing whether an experimental circuit works by accident or by design? Is there a list somewhere of which 3rd-party products use which extra addresses? Thanks in advance for sensible info. Adam David. adamd@rhi.hi.is