Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!wang!root From: MICHAEL.SOPER@OFFICE.WANG.COM (Michael Soper) Newsgroups: comp.sys.mac.hardware Subject: Parity SIMMs in a MacPlus Summary: Parity SIMMs in a MacPlus Keywords: SIMM, memory, parity Message-ID: Date: 8 Aug 90 19:27:47 GMT Sender: news@wang.com Reply-To: Michael.Soper@office.wang.com Organization: Wang Labs, Lowell MA, USA Lines: 13 I'm interested in using parity (9 chip) 1 meg SIMMs in a MacPlus. Is there any known problem with this? My experience so far: I've tried a 4 meg configuration using both 120ns and 80ns SIMMs (shouldn't be any difference really). I clip R8 resistor according to Apple Technical Note #176. I power-up the machine and the screen is blank for an unusual period of time before searching for the boot drive (RAM diagnostics on 4X the memory I presume). Boot successful. But applications bomb almost immediately with a variety of IDs. Not a single application will run, like memory is unstable or something. Is any other modification needed on the logic board to accommodate the extra chip in each SIMM? I've made sure the same speed are used in all banks. (My apology to those of you who got cross-postings from comp.sys.mac.prog).