a1532@mindlink.UUCP (Alan Wong) (03/17/90)
I've recently upgraded my 520 ST to 2.5 megs with an EZ-RAM board and I've had a few problems. The first 2 megs of memory (from address $0000 to $200000) is fine, but I have problems with the 512 K bank at the end of memory($20000-$27FFFF). When I do word-length or long-length reads from this area, I sometimes get the wrong value back. With byte reads, this almost never happens. Secondly, only the lower half of a word gets munged up on the read. Has anyone else had problems like these and does anyone have a solution?
cmm1@cunixa.cc.columbia.edu (Christopher M Mauritz) (03/19/90)
In article <1329@mindlink.UUCP> a1532@mindlink.UUCP (Alan Wong) writes: > > I've recently upgraded my 520 ST to 2.5 megs with an EZ-RAM board and I've >had a few problems. The first 2 megs of memory (from address $0000 to $200000) >is fine, but I have problems with the 512 K bank at the end >of memory($20000-$27FFFF). When I do word-length or long-length reads from this >area, I sometimes get the wrong value back. With byte reads, this almost never >happens. Secondly, only the lower half of a word gets munged up on the read. >Has anyone else had problems like these and does anyone have a solution? Did you connect the extra power leads that are attached to the board to the power supply? At first, I blew this off and figured the bus could provide enough power (WRONGO!) for the extra RAM, but you will get flaky results without them connected. I used to get intermittent errors until I connected the buggers. Hope this helps. Chris ------------------------------+--------------------------- Chris Mauritz |Where there's a BEER, cmm1@cunixa.cc.columbia.edu |there's a plan. (c)All rights reserved. | Send flames to /dev/null |Need I say more? ------------------------------+---------------------------