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Forums > C64 Coding > $DC08 / TOD issue in Vice?

2015-09-13 23:41

mhindsbo

Registered: Dec 2014
Posts: 51

$DC08 / TOD issue in Vice?

I am using $DC08 as the seed value for a random function and in Vice it always reads as 0 whereas when I run it on real hardware it has the expected behavior.

I do "unlatch" the TOD in my initialization code and when I use the monitor in Vice it shows values != 0 in $DC08 - $DC0B (as you would expect), but lda $DC08 always returns 0 in AR.

Is this a known Vice issue or am I doing something wrong?

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2015-09-15 10:35

chatGPZ

Registered: Dec 2001
Posts: 11386

- yes, the monitor _should_ not have side-effects when accessing I/O. however, that part of the code apparently wasn't implemented properly in all cases (i have fixed a bunch of things related to that since 2.4, but i still would'nt guarantee it works 100%)
- the random autostart delay is 5 frames maximum (by default anyway), you'd have to make that value quite a bit larger to see values other than 0 in dc08 often enough (iirc the TOD cant expected to be running after plain reset/kernal init though)

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