news@hod.uit.no (USENET News System) (10/23/90)
I have tried to upgrade a new MacSE with a combination of two original 256 kb (?) SIMM bricks at position 3 and 4 - and two NEC 1 Mb SIMM's at position 1 and 2. Strapping the board for 2/4 Mb. This is - i think - how I have done this on SE's before, but on this version there were only two chips on the original lower bricket. Is this a new technical solution or what ? As this has been working alright on the previous simmilar upgrades I would like advice on the subject. Most combinations (strapping,upper/lower,old-SIMM's,...) have been tested but with no good results like 512 kb RAM or zzzzummmm. From: torstein@forit.uit.no (Torstein Meyer) Path: forit.uit.no!torstein Any advice are welcome ! Torstein Meyer Systems Consultant FORUT (Reasearch Institute, Tromso, Norway) torstein@forit.uit.no torstein.meyer@itek.forut.no
torstein@forit.uit.no (Torstein Meyer) (10/31/90)
In <torstein.656691864@forit.uit.no> torstein@forit.uit.no (Torstein Meyer) writes: >Any advice are welcome ! >Torstein Meyer >Systems Consultant >FORUT (Reasearch Institute, Tromso, Norway) >torstein@forit.uit.no torstein.meyer@itek.forut.no A Brief Summary compiled by Tortein Meyer ========================================= Says Gordon Davisson at Westwind Computing : The jumper block should either be removed completely, or set so that it isn't connecting any of the pins together (I usually hang it sideways off the middle pin). Says Clark Anderson at PCB Software Tools : I recently installed (2) 1Mb SIMMs (80ns) by removing the two low density SIMMs. The silkscreen on the motherboard is wrong. Take the jumper off completely for a 4 or 2.5 meg configuration. Says Roman Kanala, University of Geneva : On 2.5 or 4 Mb Mac configurations both jumpers (or resistors on older MacSEs) should be set free. If in doubt, check with Tech. Note 176, Macintosh Memory Configurations, Apple Developer Technical Support. You can get it if you if you are registered as developer, or if you are memeber of APDA (Apple Prog's and Developer's Association, Apple Computer Inc., 20525 Mariani Ave., M/S 33-G, Cupertino, CA 95014, voice (408) 562-3910, fax (408) 562-3971, AppleLink APDA, Internet APDA@applel =========================================