Very Simple Cartridge for MSX Computers
With this PCB you can build your own MSX ROM cartridges.
You can use 8, 16 or 32kB ROM file.
To program the 32kB ROM correctly, you need to prepare the ROM file by swapping two 16kB blocks.
You can use simple windows CLI tool swapROM
The 32kB EPROM occupies address 4000h to BFFFh in the address space because it is using CS1 as read enable.
A14 will be high from 4000h to 7FFFh and low from 8000h to BFFFh. So A14 actually needs to be inverted.
By swapping the two areas no inverter is required.
Solder only capacitor C1
Only one of CS1, CS2 or CS12 should be closed.
Solder capacitor C1, resistor R1 and goldpins for JP1 jumper.
Solder goldpins for CS1, CS2 and CS12 jumper.
Only one of CS1, CS2 or CS12 should be closed.
Jumper JP1 must be closed on 1/2 or 2/3 position
