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c0pperdragon / C64-Video-Enhancement

Component video modification for the C64 8-bit computer
MIT License
257 stars 36 forks source link

Grey dot bug is not reproduced? #92

Closed modeler closed 1 year ago

modeler commented 1 year ago

Hi,

This is more of an observation than an issue, but I noticed that the grey dot bug (or gray dot bug depending on your dialect) found in the later VIC-II models e.g. MOS 8565 is not reproduced by the FPGA. This is noticeable as 'snow' on the title screen in Great Giana Sisters and other programs, but there is even a demo that uses it to draw star fields and vertical lines:

https://csdb.dk/release/?id=233555

I am interested to know if this was a conscious decision and if there is any scope for enabling it in software at some point? For the record I would prefer to keep it turned off to be honest, so please don't take this as a complaint of any kind.

Thanks!

c0pperdragon commented 1 year ago

I know of this white point but, but I just didn't want to bother trying to simulate this. Anyway, as it is, the FPGAs logic fabric is completely filled up, so there is no room for new features, anyway.

modeler commented 1 year ago

No problem, if anything I just wanted to document that the bug is not there. Thanks again for your support.