It's another week, do you know what that means boys and girls? That's right, it's time for another of QBRADQ's inane mapper discussions
This time I'm trying to create a super UOROM board again, but this time I have an eye to emulator compatibility as well. I have implemented some of the features of the Bandai mapper (iNES #16) in discrete logic, specifically 16-KB PRG-ROM banking, fixed bank, WRAM and 4-mode mirroring select (H, V, 1A, 1B).
I think I'll actually try to build this one into a dev cart. I've been itching to do a discrete logic project, and this seems like a good one.
Here is the project page which includes the combinational logic equations, theory of opperation, the schematic in PNG and Eschema formats and other KiCad support files. The archive also contains a preliminary DIY Layout Creator file for the perfboard prototype. I've only found this program today so I'm not quite sure how this will turn out.
I am looking for some advice on how to connect the mapper board to the NES. My first thought was to take an NROM board, desolder the components (other than the CIC), solder wires to the pins I need, then solder those into a 60-pin ribbon cable header. I would connect that to the mapper board via a 60-pin ribbon cable. That takes care of the cart connector, and I can reuse it latter for other boards.
What other approaches have you all seen to get prototype boards connected to the cartridge slot (other than a custom PCB)?
This time I'm trying to create a super UOROM board again, but this time I have an eye to emulator compatibility as well. I have implemented some of the features of the Bandai mapper (iNES #16) in discrete logic, specifically 16-KB PRG-ROM banking, fixed bank, WRAM and 4-mode mirroring select (H, V, 1A, 1B).
I think I'll actually try to build this one into a dev cart. I've been itching to do a discrete logic project, and this seems like a good one.
Here is the project page which includes the combinational logic equations, theory of opperation, the schematic in PNG and Eschema formats and other KiCad support files. The archive also contains a preliminary DIY Layout Creator file for the perfboard prototype. I've only found this program today so I'm not quite sure how this will turn out.
I am looking for some advice on how to connect the mapper board to the NES. My first thought was to take an NROM board, desolder the components (other than the CIC), solder wires to the pins I need, then solder those into a 60-pin ribbon cable header. I would connect that to the mapper board via a 60-pin ribbon cable. That takes care of the cart connector, and I can reuse it latter for other boards.
What other approaches have you all seen to get prototype boards connected to the cartridge slot (other than a custom PCB)?