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Cirrus Logic GD542x based ISA VGA card.
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Alexander Petrov 7bb83a2b5b Initial build.
2025-09-13 16:40:54 +03:00
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README.md

Helios

CL-GD542x-based ISA VGA card. Tested, works, but may still contain minor errors. Feature connector and 64k rom option are not tested yet. Notes:

  1. R1-R5 are configuration resistors, install R2 & R4 for fast DRAM, R2 & R3 for slow DRAM. Check CL-GD543x databook if you need more info.
  2. U10 - optional, provides DD2B support (works with generic PCI BIOS).
  3. FB1-F1-D2-C68 - DDC monitor power, remove if not using U10. D2 - BAT54 or equivalent, F1 - 200mA poly fuse.
  4. U11 - optional, 93C46 used to store video modes supported by your monitor.
  5. U12, U13 - optional, ESD & hot-plug protection.
  6. C90-C92 - 10uF - 47uF 6.3V+
  7. D1 can be replaced with 1n4148

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