Model 200 RAM: Difference between revisions
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*[https://oshpark.com/shared_projects/tepuH2VQ PCB by Steven Adolf] | *[https://oshpark.com/shared_projects/tepuH2VQ PCB by Steven Adolf] | ||
*[http://www.digikey.com/short/q71vcp Parts] | *[http://www.digikey.com/short/q71vcp Parts] | ||
::(1) TC551001 128kB SRAM | ::(1) TC551001 128kB SRAM TSOP32 package | ||
::(1) 74AHC1G08 AND gate | ::(1) 74AHC1G08 5-pin AND gate | ||
::(1) | ::(1) 1uF ceramic capacitor, 0805 package | ||
::(29) round pins | ::(29) round pins | ||
Revision as of 18:17, 17 October 2017
- (1) TC551001 128kB SRAM TSOP32 package
- (1) 74AHC1G08 5-pin AND gate
- (1) 1uF ceramic capacitor, 0805 package
- (29) round pins
The ram in the DigiKey cart above is not yet tested and verified to be a working drop-in replacement for the original specified ram.
This is enough parts to build 3 boards, because you can't order less than 3 PCBs from OSHPark anyway. But you only need 1 board total per Model 200. The single new board takes the place of both ram sockets. You can reduce the parts quantities in the DigiKey order.
There will be a few unused pins left over. The order is for 3 sticks of 32 pins each. You will break away and use 14 + 14 + 1 pins from 1 stick for each ram module.