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/ | *[http://www.digikey.com/short/q7105r Parts] | ||
::(1) TC551001 128kB SRAM | ::(1) TC551001 128kB SRAM | ||
::(1) 74AHC1G08 AND gate | ::(1) 74AHC1G08 AND gate | ||
::(1) 0805 1uF ceramic cap | ::(1) 0805 1uF ceramic cap | ||
::(29) pins | ::(29) round pins | ||
The parts in the DigiKey cart above are not yet verified working/correct. | The parts in the DigiKey cart above are not yet verified working/correct. | ||
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This is parts enough 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. | This is parts enough 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 unused pins left over. The order is for 3 | 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. | ||
Revision as of 17:51, 17 October 2017
- (1) TC551001 128kB SRAM
- (1) 74AHC1G08 AND gate
- (1) 0805 1uF ceramic cap
- (29) round pins
The parts in the DigiKey cart above are not yet verified working/correct. - Ram might not work - Pins might not be optimal
This is parts enough 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.