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- Newsgroups: comp.sys.atari.st
- Path: sparky!uunet!usc!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!news.csuohio.edu!hoare.cba.csuohio.edu!llunch
- From: llunch@hoare.cba.csuohio.edu (Jason Baker)
- Subject: Re: JRI simm upgrade questions
- Message-ID: <1992Dec12.183359.25050@news.csuohio.edu>
- Sender: news@news.csuohio.edu (USENET News System)
- Organization: Cleveland State University, Cleveland, Ohio
- References: <Bz4BoE.7up@srgenprp.sr.hp.com>
- Date: Sat, 12 Dec 1992 18:33:59 GMT
- Lines: 9
-
- Well, if your 520st is like mine (extarnal power supply, external
- floppy, RF modulator), you should do the following:
- If 4 meg of rma is to be installed using the jri ram+ type "c"
- board, the existing 512k of ram will need to be disabled by
- removing the (cas0l) and (cas0h) signals supplied by the mmu
- chip to pin 15 of the ram chips. This is accomplished by
- removing r133 and r134 then connecting pin 15 of u30 and pin
- 15 of u32 to pin 8 of any ram (+5 volt buss).
-
-