mka@sean.UUCP (mka) (08/09/90)
Ages ago I heard of an adapter that allows a 68020 chip to be
inserted into a 68010 socket. Reportedly, the 68020 would then
run without further fuss. Anyone know about this: where they
might be obtained and if they work?
Thanks in advance,
Mike Anderson
{uunet|uokmax}!sean!mka
(405) 943-3123 ofc
(405) 752-5293 homegreg@cheers.uucp (Greg Onufer) (08/09/90)
mka@sean.UUCP (mka) writes: >Ages ago I heard of an adapter that allows a 68020 chip to be >inserted into a 68010 socket. Reportedly, the 68020 would then >run without further fuss. Anyone know about this: where they >might be obtained and if they work? Motorola has an Application Note containing the schematics for such an adapter. It is relatively simple and also allows use of a floating-point chip. The board uses the following: 1 - MC68020 1 - MC68881 4 - PAL16R4A-15 6 - 4.7K pullup resistors The Application Note is AN944, "MC68020 and MC68881 Platform Board for Evaluation in a 16-Bit System". The drawback is that software which relies on the exception stack frames must be modified. I had looked into this a while ago as a means of speeding up my Sun-2, but determined that since the boot proms and SunOS would no longer run, it was of no use. The advantages are increases of performance up to 200% (in the App Note's benchmarks). Cheers!greg