Am Donnerstag, 20. August 2020, 21:31:30 CEST schrieb Francesco Messineo: > Hi all, > I am wondering whether or not you can set and read the unused bit P5 > on the internal 7501/8501 CPU. I don't have a working CPU to make the > test. > However, I can set and read both the P6 and P7 bits on a 6510 and set > the corresponding DDR bits in the register too. If P6 and P7 DDR is 0 > (so, inputs) the port bits read 0, I assume they're pulled down > internally somehow? > Can someone make a similar test on a 7501 please? > Thanks in advance. > Frank IZ8DWF on the 6510, all port bits exist and work - they are just not connected to the outside world. i'd assume the same for other variants of the cpu. see here: https://sourceforge.net/p/vice-emu/code/HEAD/tree/testprogs/CPU/ cpuport/ and yes, it would indeed be interesting to know test results from 7501/8501 :) -- http://hitmen.eu http://ar.pokefinder.org http://vice-emu.sourceforge.net http://magicdisk.untergrund.net Das Licht am Ende des Tunnels koennte auch der Gegenzug sein.Received on 2020-08-20 22:02:16
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