On 8/20/2020 2:45 PM, groepaz_at_gmx.net wrote: > 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. > > > > > If someone will send a sample app, I am happy to try it on the +4 sitting here. Jim -- Jim Brain brain_at_jbrain.com www.jbrain.comReceived on 2020-08-21 02:00:03
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