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RAM Expansion for the OtterX (CommanderX16 compatible) computer

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OtterX RAM Expansion

Introduction

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.

Installed RAM Expansion

Disclaimer

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!

Known Issues

Rev. 0

  • None

Bill of Materials

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.

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RAM Expansion for the OtterX (CommanderX16 compatible) computer

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