MSX complaints

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By l_oliveira

Hero (531)

l_oliveira의 아바타

12-05-2016, 03:00

Look the picture. There are two 74LS273s (D-Type flip-flop x 8) for a reason. Each holds 8 bits for one of the expanders. Each of the flip-flops will only respond to write or read from the primary slot they're connected to (ports from the 74LS32 make sure it goes that way).

That circuit works perfectly, by the way.

By tvalenca

Paladin (747)

tvalenca의 아바타

12-05-2016, 18:32

flyguille wrote:

I hope you didn't mix those $FFFF registers, Each $FFFF register value must be independent, one for each primary slot.

He could decode &HFFF and then sum this decode address to each SLTSEL independently. no actual problem here.

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