Model 200 RAM: Difference between revisions
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The model 200 comes with 24k built in, and supports up to 3 banks of 24k | The model 200 comes with 24k built in, and supports up to 3 banks of 24k | ||
Steven Adolph | This module, designed by Steven Adolph, adds both possible optional 24K banks, for a total of 3 banks when installed. | ||
UPDATE: The pcb and parts below have been replaced by this updated design: | |||
*[https://oshpark.com/shared_projects/o1iXGzr1 PCB] | |||
*[http://www.digikey.com/short/jmq927 Parts] | |||
This is parts to build a single board, although OSHPark will ship you 3 boards. You only need one board for one Model 200 computer. If you want to build all 3 boards, then triple all the part quantities on the digikey cart. | |||
OLD VERSION: | |||
*[https://oshpark.com/shared_projects/tepuH2VQ PCB] | *[https://oshpark.com/shared_projects/tepuH2VQ PCB] | ||
*[http://www.digikey.com/short/q71vcp Parts] | *[http://www.digikey.com/short/q71vcp Parts] | ||
Revision as of 00:43, 11 May 2018
The model 200 comes with 24k built in, and supports up to 3 banks of 24k
This module, designed by Steven Adolph, adds both possible optional 24K banks, for a total of 3 banks when installed.
UPDATE: The pcb and parts below have been replaced by this updated design:
This is parts to build a single board, although OSHPark will ship you 3 boards. You only need one board for one Model 200 computer. If you want to build all 3 boards, then triple all the part quantities on the digikey cart.
OLD VERSION:
- (1) TC551001 128kB SRAM TSOP32 package
- (1) 74AHC1G08 5-pin AND gate
- (1) 1uF ceramic capacitor, 0805 package
- (29) round pins
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 part quantities in the DigiKey cart before ordering.
The pins are installed by pulling the pins out of the plastic insulator, and dropping the pins into the holes from the top, then soldering, then cutting off the top. You need 29 pins per board, so one 32-pin stick provides all the pins for one board.
More info