Hi All!
I'm trying to upgrade a CX-11 to MSX2. I know it is hard without the service manual, but I'm trying.
In my head, the steps are:
- Upgrade VRAM to 128K (a pair of 4464 on top of the 4464 pair, pin 16 of the top memories connected to pin 60 of VDP, CAS1)
- MSX 2.0 MAIN ROM (without RTC and F4 register code) on place of MSX1 MAIN ROM
- MSX 2.0 SUB-ROM in slot, CE/OE connected to /SLTSEL
It **should** work. But it isn't.
Did I miss something?
Thanks!
Alexandre
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