Is this conversion as simple as replacing the CHR-ROM chip by a SRAM one (and bringing the CHR /WR signal to it)? I'm asking because I have never seen a TGROM board in person, and since the MMC3 controls a bunch of CHR address lines, I though maybe the address lines in this board are connected directly to the SRAM chip, instead of going through the MMC3.
If this is correct, what would be the correct way to perform this conversion? Would cutting all the traces of address lines comming from the MMC3 and soldering 13 wires (14 if you count the CHR /WR) from the cart connector into the SRAM chip work? Can all those lines comming out of the MMC3 be left unconnected?
Can anyone that owns a TGROM board tell me what happens to the CHR address pins comming out of the MMC3?
I'm looking into using this board for my project, since the 256KB of ROM I can have in a UOROM board seem to not be enough anymore. With a TGROM board I can have 512KB of program ROM, and the possibility to switch ROM in chunks of 8KB seems like a plus.
I have a bunch of TLROMs at home, but the TGROMs are pretty rare. So the only possible solution for me is this conversion.
Thanks for the help.
If this is correct, what would be the correct way to perform this conversion? Would cutting all the traces of address lines comming from the MMC3 and soldering 13 wires (14 if you count the CHR /WR) from the cart connector into the SRAM chip work? Can all those lines comming out of the MMC3 be left unconnected?
Can anyone that owns a TGROM board tell me what happens to the CHR address pins comming out of the MMC3?
I'm looking into using this board for my project, since the 256KB of ROM I can have in a UOROM board seem to not be enough anymore. With a TGROM board I can have 512KB of program ROM, and the possibility to switch ROM in chunks of 8KB seems like a plus.
I have a bunch of TLROMs at home, but the TGROMs are pretty rare. So the only possible solution for me is this conversion.
Thanks for the help.