Fixes to shadow mode on Master

BigEd / beeb816

65816 upgrade for BBC Micro, including lots of fast RAM (see also boot816)

https://sites.google.com/site/beeb816

GNU Lesser General Public License v2.1

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Fixes to shadow mode on Master #3

Closed hoglet67 closed 3 years ago

hoglet67 commented 3 years ago

Actually, don't merge this yet, something is not quite right.....

hoglet67 commented 3 years ago

I think the sync changes you made are having an unexpected effect.

Before that change, I could run in shadow mode (mode 133) and the VDU driver would be able to write to the shadow frame buffer when running at speed (how I have no idea, but it just worked).

After that change this no longer works.

I'll investigate further....

revaldinho commented 3 years ago

Merging this pull request and will invert the polarity of the SYNC signal when in high speed mode in the next commit.