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Home Forums 68kMLA Designing a portable RAM card — #169
Post #169 by techknight
Source Forum68kMLA
CategoryHardware
Post DateFri, 7 Nov 2014 - 23:38
Original URLhttps://68kmla.org/bb/threads/designing-a-portable-ram-card.314/
Post
Doubt it. The 170 is 32-bit throughout.

Best I can do is LC. As itll be 32 bit shoehorned on a 16 bit bus.. however... there is a however.

I can fill the rest of the new address space as RAM, 32 Bit RAM.

Then if I can figure out how to tell Mac os to use the RAM at the end of address space instead of the beginning, it should increase the performance immensely.

Nothing I can do about exception and interrupt vectors which reside on low ram. But eh. Just got to tell the mac memory manager where "ram" is.

Im sure itll be some sort of extension or system enabler coded to do it. Leave interrupts and exception in low ram. Move heaps and system into high ram.

Bbraun would know more than I about this part.

mp.ls