Hi,
I'm trying to make 512KB BNROM board using Mashou as a donor.
The cart have 74'161 IC and I was wondering how I can rewire it to support 512KB since the last 2 upper bank bits are not connected. I was able to get at least 256KB supported but then I got stuck.
Here's the wiring diagram for 256KB:
Any help to make this 512KB appreciated.
I'm trying to make 512KB BNROM board using Mashou as a donor.
The cart have 74'161 IC and I was wondering how I can rewire it to support 512KB since the last 2 upper bank bits are not connected. I was able to get at least 256KB supported but then I got stuck.
Here's the wiring diagram for 256KB:
Code:
.--\/--.
+5V -o|01 16|-- +5V
PRG /CE --|02 15|-- NC
PRG D0 --|03 14|-- PRG A15
PRG D1 --|04 13|-- PRG A16
PRG D2 --|05 12|-- PRG A17
PRG D3 --|06 11|-- PRG /OE
GND --|07 10|-- GND
GND --|08 09|o- PRG R/W
`------'
+5V -o|01 16|-- +5V
PRG /CE --|02 15|-- NC
PRG D0 --|03 14|-- PRG A15
PRG D1 --|04 13|-- PRG A16
PRG D2 --|05 12|-- PRG A17
PRG D3 --|06 11|-- PRG /OE
GND --|07 10|-- GND
GND --|08 09|o- PRG R/W
`------'
Any help to make this 512KB appreciated.