✅ means I tested the functionality and it works, ❌ means I tested the functionality and found issues, ? means that the functionality has yet to be tested. You're encourauged to take what you deem fit from this, and use it in your projects! Functionalities Your computer might crash, catch fire or be destroyed in other nasty ways. I take NO responsibility for what happens if you decide to build and use this card. Pics!Įxample of a low-res EGA game, with palette choosen between the 64 EGA colors (instead of the 16 CGA colors) You will need a monitor capable of syncing to 15, 18 and 21Khz. This board does NOT perform any frequency conversion. It is recommended to use an 'LS244 as the output buffer, an LS or an HCT is fine for the input. The PLD is sandwiched between two '244 buffers to protect it from shorts and allow the user to experiment with different logic families to better handle the input. The board uses a GAL20V8 PLD to implement the conversions, sync polarity detection, brown-fix, etc. This board converts CGA/EGA/MDA/Hercules TTL signals into analog RGB signals that can be fed into a compatible monitor.ĭepending on jumper settings, it can automatically detect MDA/Hercules and Hi-res EGA modes (uses vsync polarity detection), can be forced into low-res 64 colors EGA and can perform the "brown-fix" for CGA. MDA/CGA/EGA/HERCULES TTL-to-ANALOG Converter Introduction
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