Posted By
gerliczer
on 2021-01-11
05:45:38
|  Re: Polish games from 1989-92 dug up after 30+ years
@Gaia: Regarding TP register value 0 the manual really not says anything explicitly. However, there is this sentence: "Note also that due to the design technique used in the Tone Period count-down, the lowest period value is 000000000001 (divide by 1) and the highest period value is 111111111111 (divide by 4,095)." That may suggest writing 0 to TP should result in a different value. I read somewhere that 0=1. On the other hand, reading a random discussion of seemingly AY emulation developers of hackers yields another strange nugget of information. One person stated that the phases of tone generators are only after reset in a determined state, later they are driven in all directions by the periods, but writing 0 and the desired period back-to-back to TP register causes the channel phase to reset.
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