Newsgroups: comp.sys.apple2 Path: news.weeg.uiowa.edu!news.uiowa.edu!hobbes.physics.uiowa.edu!zaphod.mps.ohio-state.edu!cs.utexas.edu!uunet!munnari.oz.au!comp.vuw.ac.nz!actrix!David.Empson From: David.Empson@bbs.actrix.gen.nz Subject: Re: OctoRAM Memory upgrade Organization: Actrix Information Exchange Date: Sun, 17 Jan 1993 13:28:02 GMT Message-ID: <1993Jan17.132802.18052@actrix.gen.nz> References: <1993Jan12.022552.27758@nuscc.nus.sg> Sender: David.Empson@actrix.gen.nz (David Empson) Lines: 65 In article <1993Jan12.022552.27758@nuscc.nus.sg> ltchean@iss.nus.sg (Lim Thye Chean) writes: > > Hi, any OctoRAM users out there? Yep. :-) > I lost my OctoRAM manual, so I have to ask this in InterNet: > > I am now using 2MB on my RAM card, all 8 rows filled with 256K simms. I plan > to upgrade to at least 4MB. > > 1. Can I upgrade to more than 4MB? Yes. You can use eight 1 megabyte SIMMs, but DMA compatibility might be a problem. > 2. Do I have to throw away all 8 rows of 256K simms and used all 1MB simms? Yes. > 3. Can I mixed both simms? For example, reserved 6 rows of 256K simms > (6 x 256K = 1.5MB), and used 2 rows of 1MB simms to get a total of > 3.5MB? Or reserved 4 rows of 256K simms (4 x 256K = 1MB) and used 4 > rows of 1MB simms to get 5MB? No. All SIMMs must be the same type. > 4. Can I have the dip-switch configuration? In the following diagrams, L means 'jumper to the left' and R means 'jumper to the right', and the jumpers are listed top to bottom. Using 256k SIMMs: 1 (256k) L, L, L, L, L 2 (512k) L, L, L, R, L 4 (1 MB) L, L, L, R, R 8 (2 MB) R, L, L, R, R (This should be your current setting) Using 1 MB SIMMs: 1 (1 MB) L, R, R, L, L 2 (2 MB) L, R, R, R, L 4 (4 MB) L, R, R, R, R 8 (8 MB) R, R, R, R, R > 5. What precautions should I take? When buying the SIMMs, make sure you get ones that will work on a Mac Plus, SE, or II. IBM SIMMs (9 way) should also work, but I've heard of some people who have had problems. If you're installing less than 8, make sure you put them in the correct slots. The first SIMM goes in the top of the group of two slots, the second below that, then fill the group of six slots from the top. The only valid combinations are 1, 2, 4 or 8 SIMMs. -- David Empson Internet: David.Empson@bbs.actrix.gen.nz EMPSON_D@kosmos.wcc.govt.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand Path: news.weeg.uiowa.edu!news.uiowa.edu!uunet!ddsw1!panix!not-for-mail From: blakjak@panix.com (Noah Mittman) Newsgroups: comp.sys.apple2 Subject: Re: need OctoRam manual Date: 27 Feb 1994 19:38:17 -0500 Organization: School of Visual Arts: Video Junkies Lines: 42 Message-ID: <2kredp$4eq@panix.com> References: NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Richard Murray 235-4680 (xint@cuug.ab.ca) screamed from comp.sys.apple2: : As the heading implies I am searching for instructions on how to set my : OctoRam cards jumpers to accept 1 meg SIMMS. Any help would be Appreciated. The following are the jumper positions for the 1Meg SIMM configurations: - [ ] means jumper over middle and right pins [ ] - means the opposite ========================= [ ] - - [ ] - [ ] [ ] - [ ] - FOR 1 MEG [ ] - - [ ] - [ ] - [ ] [ ] - FOR 2 MEG [ ] - - [ ] - [ ] - [ ] - [ ] FOR 4 MEG - [ ] - [ ] - [ ] - [ ] - [ ] FOR 8 MEG -- b l a c k J A C k Internet blakjak@panix.com FVNet #3@#53 original score by Wierzbowski written and directed by Noah Mittman produced by SVA & digitalTarget video "She's dead. She's alive. It's a little confusing."-Alek COMING THESIS '95