Date: Wed, 20 Jul 2005 15:25:32 -0700
Subject: Re: 512 & Plus RAM change?
From: <[EMAIL PROTECTED]>
From: "J.B. Troost" <[EMAIL PROTECTED]>
Is it possible to use the SIMMS in a 512 for a Plus and if so how do I
dismantle the logic board of the 512? The board of the Plus is no
problem, but a small board prevents the thing from sliding out the
case.
No. The RAM chips in the 512k cannot be used in a Plus. They are easy to
remove from the logic board, however, just desolder, but they will only be
good on another 512k or a 128k (w/minimux). And I don't understand the last
part of your question at all. Are you talking about the RAM SIMMs that stick
up at an angle at the rear of the Plus logic board? If so, you have a
problem with the way they are seated or the chassis is bent. Either way, the
board is designed to slid in and out easily with those SIMMs installed.
It sounds as if the 512 has a daughter board on top, in which case it
is not a stock 512K. Because the original poster specifically
mentioned SIMMs on the 512K, my guess would be that there is actually
an upgrade board on his 512K which uses SIMMs and he doesn't realize
that it is not a normal part of the 512K.
So Mr. Troost may have been referring to actual SIMMs in the 512,
rather than the motherboard memory chips.
J.B. we need to know whether there is a daughter card attached to
the main board in your 512. It sounds like there is since you're
having trouble removing the logic board.
If that is the case, unplug the cable that attached the logic board
(horizontal board) to the analog board (vertical board) and unplug
the floppy cable. Then turn the machine upside down and using a
medium flathead screwdriver, gently pry one side of the metal frame
away from the logic board just enough to slip that edge of the logic
board loose.
The logic board is on two rails/slots which are part of the frame.
You can't slide the board in and out once there's a daughter card
installed.
I hope that helps.
Jeff Walther
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