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41CL: AMMC_OSX Rom, Bug in PGSIG?
10-03-2016, 10:23 PM
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RE: 41CL: AMMC_OSX Rom, Bug in PGSIG?
I also had some issues with this OSREV function of the Library 4 module a few months back and saw similar behavior as you observe, but I have also seen it working, on the same machine.

The code that updates the LCD here does not deselect the LCD (using PFAD=C), but assumes it will be taken care of by DADD=C (RAM select). For the emulator I am working on, it caused massive problems. On real hardware, it seems to work better, but not always.

I have looked into a lot of internal papers trying to figure out if DADD=C should indeed deselect the LCD, but found nothing to indicate such behavior should exist on the LCD. (The timer chip have this feature).

Håkan
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RE: 41CL: AMMC_OSX Rom, Bug in PGSIG? - hth - 10-03-2016 10:23 PM



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