I just found this Hires-Graphics-Extension in a B720. It plugs between the Char ROM and the Screen Memory. It also plugs in the 74245 buffer U30 - and the 245 is on the hires-board. It has 32kB dedicated ram. That's enough for one page with 640x350 resolution monochrom. It also has some wires to the userport and an addition 7414 piggypacked...
Has anybody Infos about this extension?
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