icsu8212@caesar.cs.montana.edu (Stone) (12/06/89)
I recently bought a SupraRam 2000 w/2MB installed for my Amiga 2000. I have
a version 4.5 mother board. After trying everything I can imagine: switching
ram chips, trying every slot, and even buying a second board, I still can't
make it work. All the rolling bits tests and address tests return errors.
They indicate an error in data bit D1 bad bit 00000000 00000010 for both
boards and every configuration of ram chips in every slot. Supra
suggested (after getting the same results with two different boards) that
I probably have a problem with my Agnes chip. I was hoping that someone
might have run across a similar problem or might have some suggestions.
I have had my computer for 10 months and have not had any problems with
it or any sign of unusual operation.
Thanks
--
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//X\\ | icsu8212@caesar.cs.montana.edu
/// \\\ AMIGA HACKER | Murphy's First Law: (un-amended)
/// Mike Stone | Nothing can possibly go wrong.daveh@cbmvax.UUCP (Dave Haynie) (12/07/89)
in article <2646@caesar.cs.montana.edu>, icsu8212@caesar.cs.montana.edu (Stone) says: > I recently bought a SupraRam 2000 w/2MB ... All the rolling bits tests and > They indicate an error in data bit D1 bad bit 00000000 00000010 for both > boards and every configuration of ram chips in every slot. Supra > suggested (after getting the same results with two different boards) that > I probably have a problem with my Agnes chip. I certainly wouldn't suspect Agnus. She's not in the data path. If you're saying that in every single test, every memory location, etc. you're seeing a D1 high, my first guess would be that you have a rather persistent short on the D1 line in the expansion bus, possibly directly to +5V. If you had only tested one Supra board, I would be real sure that the board itself had this short. If you have other expansion devices that work well, I'd start to suspect Supra's manufacturing, since that would tend to point to two boards each with the D1 short. If you have nothing else in the expansion bus, my guess would that there's a D1 short on your motherboard. I've never heard of this happening before, but I suppose there's a first for everything. Note that the board would still configure with that short -- autoconfig only uses D15-D8 for most boards. If you have something like an autoboot hard disk controller out there, you can be sure there's no short on the bus. In any case, it wouldn't hurt to try a different memory board in the bus, maybe you could just borrow one from someone. Every 2000 is supposed to be tested with memory and other cards on the production line. > /// Mike Stone | Nothing can possibly go wrong. -- Dave Haynie Commodore-Amiga (Systems Engineering) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy Too much of everything is just enough