Posted By
Gaia
on 2018-08-25
15:43:50
|  Re: Tom Thumb
As siz hinted Tom Thumb regularly writes to the raster counters (namely $FF1D and $FF1F) which has an impact on the TV as well, since the TED emits video signals defined by events triggered by these counters. It can happen, that Tom Thumb unwillingly increases the number of raster lines per frame - 312 per default in the PAL machines, which is non-standard already on its own right. So, in case your video grabber is extremely picky on the signal quality, alas, this means that it gets confused and thinks the signal is invalid. Question is whether it can be tweaked somehow to have a larger tolerance than the default.
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