O4MEGA/instructions.txt at master · msx-solis/O4MEGA · GitHub

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Description
This module increases the system's RAM memory quantity and can be filled partially to obtain 1M, 1.5Mb, 2...
Only valid for Omega Home computer because the mapper circuit is included on the Omega's mainboard.

Bill of materials

7x AS6C4008
1x 74HCT08 (74HC08 or 74LS08 should be valid too)
7x sockets 32DIP600
1x socket 14DIP300
8x 100nF capacitors (104) if you are going to add also the F4/FMPAC module, would be better chose SMD 1206 package for C1, C2 & C3.
1x 2x20 straight pinheader
1x O4MEGA PCB