This card expands the RAM of your OtterX (a DIY CommanderX16 compatible) computer to 2MB!
Once You switch J27 to enable the external RAM and install this board, the computer will automatically detect the 2MB.
I take NO responsibility for what happens if you decide to build and use this card. Your computer might crash, catch fire or be destroyed in other nasty ways. You're encourauged to take what you deem fit from this, and use it in your projects!
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| Component | Qty | Type / Value | Link |
|---|---|---|---|
| C1, C2, C3, C4 | 4 | 100nF / 1206 / ceramic | https://www.mouser.it/ProductDetail/581-1206YC104JAT2A |
| U4 | 1 | 74AC139 / SOIC-16 | https://www.mouser.it/ProductDetail/863-MC74AC139DR2G |
| U1, U2, U3 | 3 | 512Kx8 SRAM / SOP-32 | https://www.mouser.it/ProductDetail/968-R1LP0408DSP5SIS1 |
| J1 | 1 | 2x20 header, 2mm pitch | https://www.mouser.it/ProductDetail/200-MTMM12004TD157 or https://www.mouser.it/ProductDetail/200-MTMM12009LD350 |
Depending on whether you added or not a socket for the IC in the area where the expansion is installed, select one type of header or the other: MTMM-120-09-L-D-350 clears the height for the sockets and the ICs.