🚀 go-pugleaf

In article <JITA.90Dec9215738@polaris.utu.fi> jita@polaris.utu.fi (Marko Katajisto) writes:
>In article <598@amix.commodore.com> ford@amix.commodore.com (Mike "Ford" Ditto) writes:

>PS. Any ideas how to break this annoying 4 meg barrier on this board, maybe
>Dave Haynie could hack out a replacement of these 1 mb chips to 4 mb chips?

For the A2620, its possible to replace the memory decoding PAL with one that
allows you to move the 4 Megs of 32 bit memory from being autoconfigured to
sitting fixed at $01000000.  There's no simple way to get more addressing on
the A2620 without some serious hacking to it, since the extra address lines 
needed don't go anywhere, etc.  So you can have more 16bit RAM, but no more
32 bit RAM.  Maybe if I had the 4MB DRAM specs back then I would have thrown 
something in.  The A2630 doesn't support this relocation, though it does in
theory have this daughterboard support, should someone ever feel inclined to
build such a device.  The current board would need about as much hacking for
4MB DRAM support as the A2620.

>Jita - Marko Katajisto    University of Turku  Department of Computer Science


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