Thread View: net.micro.atari16
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Started by Landon Dyer
Sat, 22 Mar 1986 02:19
520ST 1Mb upgrade hints
Author: Landon Dyer
Date: Sat, 22 Mar 1986 02:19
Date: Sat, 22 Mar 1986 02:19
15 lines
1300 bytes
1300 bytes
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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