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Date Posted: 18:02:06 07/19/01 Thu
Author: Chris Lawson
Subject: 64MB RAM in Mystic

Just got finished talking with Velocity Upgrades about their 64MB RAM chips. Rob, their head tech, claims they tested all variants of the 64MB 72-pin module that they make (single-banked, double-banked, 2K refresh, 4K refresh, etc.) and none of them worked. I don't believe him, at least not completely.

However, we did agree that an issue here might be the RAM controller used in the various LC575s. I have two LC575 boards, neither of which works with a 4K refresh, double-banked chip. The RAM controllers are located next to the PRAM battery, between it and the VRAM slots.

Controller #1 from LC575 logic board part no. 820-0464-B:

9446 (made 46th week of 1994)
ADN141A3
343S1091-A N
(M)(C)1992 Apple

Controller #2 from Performa 578 logic board part number 820-0464-A:

AT&T
343S1091-A B
1042BE
9404S 47487743
(M) (C) 1992 Apple

More in next post since the Forum only allows 50 lines maximum...

cl

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