[mapesdhs]

Thanks guys! That's been my rationale too. Oddly enough I found the kevin009.com site yesterday which is why, after reading through the docs, indeed my thinking moved more towards an XMAP2 or CLUT memory. The described parallelism reflects the 12x5 layout of the VRAM ICs, etc., but I didn't want to clutter up my OP with that. Eventually I'd like to sort out combined info pages that show how a board functions conceptually, electrically and schematically, hopefully construct PDFs if none exist atm so that one can work on repairs in the same way Rossmann does. That's a very long term goal though.

Alas the striping is so bad it makes text too unreadable, not worth running the ide tests as it is. Re fixing such things, that is my ultimate goal, to offer repairs instead of just supplying replacements, since working spares/systems are almost impossible to find these days. A very different kind of task to what I do atm though, very time consuming. I'll be about two years before I'm good enough I think.

I'm about to knock up an XMAP2 pinout in WinFIG.

Ian.