Yes, the I/O port will still be used for bank switching the different sets of 128kb vram. Im going
to make it to where the switch on the back of the console enables the modchip, the I/O ports will
switch between the 128kb sets of vram, but Im also going to have another switch on the modchip itself
that can disable the I/O ports if only the expanded 128kb vram is to be used. I think channel 3 will
disable the modchip and channel 4 will enable it. Now how the modchip is currently set up I believe
the I/O ports have a not gate on them because of trying to get games like yoshi's island to work
without having a switch. These not gates will be removed on the new modchip. Im also going to make a
new pcb for the controller connector so I can put a dual color (red/blue) led on it so when its red
it will be like the original console and when its blue it will have the modchip activated.
Let me know what you think about the new setup for the modchip.
Also the patch I posted doesn't use the I/O ports its just for 128kb vram testing. The hidden feature
in higan (tested on v100 - v106) to activate the 128kb should display the 64kb and 128kb correctly.
The patch was made to test the switch on the back of the console. The switch was wired to cpu pin 19
position on the modchip and cpu pin 20 was disconnected on the modchip to test it and it works perfectly.
Here is a picture of where I connected to the RF board on the snes:
When I get the new modchip made I would like to send you one of the consoles (for free) for research purposes
if you would like one to run test on. I still have to design the new pcb's and run test on them to make sure they
work properly so its probably going to be a couple of months before its ready.