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R800 DMA...

by PingPong on 04-05-2019, 20:09
Score: 130.66 %, Type: Forum topic , Comments: 43 comments
instead of: ld a, l out (0x99),a ld a, h or 0x40 out (0x99),a became ld c, ... will need to change VDP R15 in order to read either status register S0 and S1. So _ANY_ non-interrupt code ... is extremely slower, in the best case you need 2us to perform a memory access (page 0). OK, the out on z80 ...

Cartridges that requires 12Vdc power supplies and MSX that do not do it

by Giangiacomo Zaf... on 04-05-2019, 13:12
Score: 130.63 %, Type: Forum topic , Comments: 5 comments
I have a Panasonics MSX FS-A1FX MSX2+ that does not work with some sound cards (Panamusement FM-PAC, yamaha SFG-05), and I put the blame on 12Vdc mains, I know this is just educated guess assumption. I found this item on Kadenken shop that allegedly ...
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