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keirf / flashfloppy-osd

On Screen Display and keyboard controller for FlashFloppy
The Unlicense
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A600 video info #5

Closed penfold42 closed 4 years ago

penfold42 commented 4 years ago

If you are only using RGB analog (and not composite) the same approach as the A1200 should work. E253R CSYNC E260R Red E259R Green E258R Blue

If you also want the OSD to work via composite (or S-Video if you have modified it) then we will need to test a slightly different approach. If will likely involve injecting the video into R212 or R215: image

keirf commented 4 years ago

I will add info on this to the wiki. Looks like no handy test point for kbd signals either, sadly.

keirf commented 4 years ago

I have updated the wiki, please take a look. I'm pretty sure mixing OSD into the signal at R211-213 will work fine. Perhaps the 150-ohm impedance will require a slightly bigger-than-usual resistor in the OSD wire.

penfold42 commented 4 years ago

Looks good - I may soon have access to a 600 for validation

keirf commented 4 years ago

It would be nice to get photos too... Perhaps we leave this open for a bit.

penfold42 commented 4 years ago

Of course !