Macintosh-HW/SE-VGA
1
0
Fork 0
mirror of https://github.com/techav-homebrew/SE-VGA.git synced 2025-03-28 09:35:57 +00:00
Code Issues Projects Releases Wiki Activity
SE-VGA/README.md
techav 77a0a23e1a partial draft 1
2021-04-06 23:15:48 -05:00

413 B
Raw Blame History

SE-VGA

Simple CPLD project to mirror the Mac SE video over VGA. No scaling is performed -- the Mac 512x342 video is displayed letterboxed (black borders) in a 640x480 frame.

Circuit uses a single AFT1508AS-100AU CPLD, 32kx8 15ns SRAM, and a 25.175MHz can oscillator, along with some passives.

Plugs into SE PDS slot and snoops writes to the frame buffer memory locations. Writes are cached and copied to VRAM.