Re: GO64 tech stuff?

From: Richard Atkinson (
Date: 2000-08-26 16:06:40

On Sat, 26 Aug 2000, Richard Atkinson wrote:

> Some much-needed corrections and further thoughts

OK, forget that. This TEST bit clearly is a "can of worms"; I just tried
lines 043 and 042 and got completely different results with each again.
Line 42 was particularly interesting as there was no flickering around the
spot where TEST got set (I think it is that place, rather than 8 cycles
later where it gets reset), but instead what looks rather like the 3 cycle
period at the beginning of an FLI line; the character colour was light
grey and the character was $FF, for the whole of the character. The
routine was synchronised with the screen by this (no flickering), hence I
suspect the processor was stopped during those 3 cycles.

I suspect full understanding of what the TEST bit does is going to take a
long time. Having opened the can of worms, we must now delve inside :)


Richard Atkinson
Software Engineer
Tenison Technology EDA Ltd

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