Model 200 RAM: Difference between revisions
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The model 200 supports up to 4 banks of 24k each. | |||
*[https://oshpark.com/shared_projects/tepuH2VQ PCB | There are several ways to add ram. | ||
Steven Adolph designed this module to provide all 4 possible banks at once. | |||
*[https://oshpark.com/shared_projects/tepuH2VQ PCB] | |||
*[http://www.digikey.com/short/q71vcp Parts] | *[http://www.digikey.com/short/q71vcp Parts] | ||
::(1) TC551001 128kB SRAM TSOP32 package | ::(1) TC551001 128kB SRAM TSOP32 package | ||
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::(29) round pins | ::(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 | 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. | 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. | ||
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[[File:200_ram_sa_2.jpg|200px]] | [[File:200_ram_sa_2.jpg|200px]] | ||
[[File:200_ram_sa_3.jpg|200px]] | [[File:200_ram_sa_3.jpg|200px]] | ||
[[File:200_ram_sa_4.jpg|200px]] | |||
[[File:200_ram_sa_5.jpg|200px]] | |||
[[File:200_ram_sa_6.jpg|200px]] | |||
[[File:200_ram_sa_7.jpg|200px]] | |||
[[File:200_ram_sa_8.jpg|200px]] | |||
[[File:200_ram_sa_9.jpg|200px]] | |||
[[File:200_ram_sa_10.jpg|200px]] | |||
[[File:200_ram_sa_11.jpg|200px]] | |||
[[File:200_ram_sa_12.jpg|200px]] | |||
[https://photos.app.goo.gl/g1G4bo6FbjJSgcqU2 More Pics] | [https://photos.app.goo.gl/g1G4bo6FbjJSgcqU2 More Pics] | ||
Revision as of 05:05, 6 November 2017
The model 200 supports up to 4 banks of 24k each.
There are several ways to add ram.
Steven Adolph designed this module to provide all 4 possible banks at once.
- (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.
