SNES M27C801 2in1 HiRom games - Diagram for Flip-flop 74HC74

[Kayumba]

Have you already made a reproduction without using the 74'74?

yes

If so, what did you do there?

For Hirom
My pin30 of 27C801 (originally A17) connected to pad 44 of PCB (which is A19)

For LoROM
My pin30 of 27C801 (originally A17) connected to pad 45 of PCB (which is A19)

After SWAP BIN method, pin30 of 27C801 digitally became A19.

So when you said :
"the 74'74 should be connected to A19"
My question is to confirm that you are talking about A19 of 27C801 (pin1) or after SWAP BIN method A19 = pin30 ?

[lidnariq]

The pin that is functionally used as A19, to distinguish between the first half and the second half of the data you programmed.


(that is, pin 30)

[Kayumba]

The pin that is functionally used as A19, to distinguish between the first half and the second half of the data you programmed.


(that is, pin 30)

If so, you talking about pin30 of 27C801 (originally A17 => became A19 after swap method).
I will try to do some test this week-end.

[Kayumba]

Thank you

[Kayumba]

Yes It's WORK!
Thank's.
Here is final diagram of LoROM/HiROM 2in1 games - for Flip-flop 74HC74 and M27C801