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- Newsgroups: comp.sys.amiga.hardware
- Path: sparky!uunet!mcsun!Germany.EU.net!news.uni-bielefeld.de!techfak.uni-bielefeld.de!markus
- From: markus@techfak.uni-bielefeld.de (Markus Illenseer)
- Subject: A2630 and A2091 problems solved
- Sender: news@unibi.uni-bielefeld.de (News Administrator)
- Message-ID: <1992Jul28.120643.5874@unibi.uni-bielefeld.de>
- Date: Tue, 28 Jul 92 12:06:43 GMT
- Nntp-Posting-Host: aidec501.techfak.uni-bielefeld.de
- Organization: Universitaet Bielefeld, Technische Fakultaet.
- Keywords: 2630
- Lines: 25
-
- As it might be for common interest, i post it.
- I had lot of trouble with my A2000 (Rev 4.1) , A2091 (Rev 6.6) and A2630
- (Rev 9.1). When the A2630 wanted to use RAM in an DMA cycle, i got a crash,
- this mostly happened while working on the harddrives. When the 32 Bit Mem
- was disabled (the RAM on the 2630) all worked fine.
- With an Oscilloscope we detected some flaky signals during DMA cycle,
- looking on the 2630 you can see that there are some Pulldown-resistor-packets,
- those weren't in the right sense.
- Soldering them out , turning them to 180 degrees and soldering them in again,
- they turn to be Pullup-resistors.
- (Unit RP100, RP101, RP102, RP103, RP104, RP105, RP106 and RP107)
-
- From now on i had no more problems at all.
- I hear this operation is called 'field upgrade from 9.2 to 9.2' ...
-
- Hope i can help anyone with this problem ..
-
- Markus.
-
-
- --
- Markus Illenseer EMail: markus@TechFak.Uni-Bielefeld.de
- Universitaet Bielefeld Fax: (+49 521) 106-2992
- Technische Fakultaet Phone: (+49 521) 106-2926(internal only); -5329
- Angewandte Informatik SnailMail: Postfach 100131, D-4800 BIELEFELD 1
-