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520ST 1Mb upgrade hints
| 520ST 1Mb upgrade hints [message #283095] |
Fri, 21 March 1986 21:19 |
dyer
Messages: 16
Registered: March 2013
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<pre>
Article-I.D.: atari.147
Posted: Fri Mar 21 21:19:05 1986
Date-Received: Tue, 25-Mar-86 02:49:25 EST
Organization: Atari Corp., Sunnyvale CA
Lines: 15
Keywords: Atari ST, 1 Megabyte, Bloody Resistors
Make sure you use heavy gauge wire (#22 or so) across the tops of the
RAM chips, and from the memory controller to the chips. Using something
like wire-wrap wire is not a good idea. Stretch the wires taut across the
tops of the chips and point-solder; don't leave any slack. (We've seen
upgrades with the wires kind of looped from one chip to the next. We don't
know /how/ they worked....)
Whether or not you need the resistors depends on the RAM chips and the
memory controller you've got. Some memory controllers have faster rise
and fall times, and generate undershoot which can fry the RAMs unless
they're protected by the resistors. The resistors should be placed close
to the memory controller (not near the RAM chips).
-Landon
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