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- Newsgroups: comp.sys.atari.st
- Path: sparky!uunet!mnemosyne.cs.du.edu!nyx!jbunch
- From: jbunch@nyx.cs.du.edu (John Bunch)
- Subject: Re: JRI simm upgrade questions
- Message-ID: <1992Dec12.223657.26231@mnemosyne.cs.du.edu>
- Sender: usenet@mnemosyne.cs.du.edu (netnews admin account)
- Organization: University of Denver, Dept. of Math & Comp. Sci.
- References: <Bz4BoE.7up@srgenprp.sr.hp.com>
- Date: Sat, 12 Dec 92 22:36:57 GMT
- Lines: 45
-
- randyh@sad.hp.com (Randy Hosler) writes:
-
- >[ Article crossposted from comp.sys.atari.st.tech ]
- >[ Author was Randy Hosler ]
- >[ Posted on Tue, 8 Dec 1992 17:09:57 GMT ]
-
- >Hello all,
-
- >I recently became the owner of a 520ST upgraded to 2.5 megs and TOS 1.4.
- >Last night I opened up the box to do the Overscan mod and discovered that
- >my 520ST had the JRI simm memory upgrade. I have no documentation on it
- >and so am hoping that someone out there can answer my questions.
-
- >I want to add another 2 megs of simms. How do I disable the 1/2 meg that's
- >on the motherboard? I saw one jumper on the board that plugs into the
- >video shifter. Do I need to remove it to add the extra ram?
-
- I dont remember about how that was done.. I had a 520 with a jri board.
- I had 4 megs, but it has been 2 years since I have used, looked at that
- machine.
-
- >Also there is an extra video shifter socket. What's the story on this?
- >Do I just plug in another shifter for the larger palette or do I need
- >some software to enable it?
-
- As far as I can remeber all you have to do is install the second
- videoshifter chip and you then get the 4096 color palette. I dont think
- there was any software needed, but if you try it and get no extra palette
- colors then send me mail, cause I know I still have the disk that came
- with the jri board around here somewhere.
-
- >Please post or email any and all information you may have about this upgrade.
-
- >Thanks, Randy Hosler
-
- John
-
- P.S. I had no problems with the board, But I bought an STe for some of
- the other feature it offered... (Blitter, Hardware scrolling etc..)
-
- --
- John B Bunch * I don't want the world, I just want your
- 280 Quail St. 1st Floor * half.... -TMBG
- Albany, NY 12208 * jbunch@nyx.cs.du.edu If mail here bounces
- (518) 436-3810 * Try John.Bunch@bbs.oit.unc.edu
-