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mlorenzati / pico-rgb2hdmi

A microprocessed RGB to HDMI Converter with USB capture
MIT License
70 stars 11 forks source link

CSYNC only will it work #35

Open shift838 opened 1 year ago

shift838 commented 1 year ago

I have an old computer that has CSYNC, Red, Green, Blue and ground.

Will this work for a system that only has a CSYNC line?

mlorenzati commented 1 year ago

Hi @shift838, short answer is yes, since the code is prepared to use HSYNC line to manage CSYNC when VSYNC is grounded. The double click is that not all CSYNCs are the same, example wise I know it works with SEGA and AMIGA CSYNC, but Sinclair + uses inverter polarity for vertical inside the CSYNC. The next step is to test it, and if it does not work we need to add a config option to invert VSYNC polarity triggering inside CSYNC.

shift838 commented 1 year ago

Is the latest gerbers the Beta3? Also it seems the wm8213 IC it is designed for is obsolete and so is the alternate WM8199.

Is there another one that can be used on this board?

mlorenzati commented 1 year ago

Latest PCB is on PCB Way https://www.pcbway.com/project/shareproject/pico_RGB_2_HDMI_3b12cb39.html

I did not check the gerbers on github, that was other collaborator work

El vie, 1 sept 2023 a la(s) 18:37, shift838 @.***) escribió:

Is the latest gerbers the Beta3?

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shift838 commented 1 year ago

Also it seems the wm8213 IC it is designed for is obsolete and so is the alternate WM8199. Is there another IC that can be used on this board to replace it?

mlorenzati commented 1 year ago

wm8199 is not yet a replacement there are some fundamental changes that renders it invalid. We need another AFE family

El sáb, 2 sept 2023, 0:19, shift838 @.***> escribió:

Also it seems the wm8213 IC it is designed for is obsolete and so is the alternate WM8199. Is there another IC that can be used on this board to replace it?

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mwedmark commented 10 months ago

AD9826 seem to be very similar, still available pretty cheap but also "on the way out". Maybe worth trying out?