I don't think there are any dual port memories that would work. It should be something that has the same pinout as a 27c64 for example.

Hi.

Did you see this project? https://hackaday.io/project/8109-sram-as-replacement-for-eprom

===Jac

I have used SRAM with builtin batteries in the past. Maybe more expensive than his solution but the same function. You still need to move it between the programmer and the project. I had liked to ...

Cheapest, No development approach would be using EEPROMs I think.

You need some headers, a pin compatible EEPROM, a ZIF socket and a EPROM programmer. (Like TL866CS)

1. Wire headers and zif socket's pins
2. Put the headers on the IC socket where normally EPROM would be placed.
3. Program EEPROM
4 ...

Hi.

I had needed a EPROM emulator instead of using a burner and move chips back and forth all the time. I have googled a little but it seems like there are no one that makes any anymore (everything I found was old and not available). It was also very expensive. Around $500. Are there any relative ...

I was going to use Microchip tools but that forces you to use their horrid 'Harmony' framework on the PIC32MZs

I didn't wanted to use that either when I switched from the MX to MZ serie, but it's not to bad. I just use it to setup the pins and in the Harmony main loop I just jump to my own ...

The goal of my project is to run a real 6502 so I won't emulate it, but it's a nice idea to do on a PIC32 if you want to create a small system. It has a lot of power and 512k RAM and 2Mb FLASH. You can probably emulate an c64 on it without any problem for example.

The PIC32MZ at 200MHz has 330MIPS so it's rather fast. For an MMU it just need to monitor the address bus and do as little as possible. It something interessting happens. A page fault or whatever, when it can halt the processor and do whatever it needs before continue on.

I have created a graphic ...

That's where the 65C816 has the advantage. The ABORT interrupt was designed to do exactly what you describe: interrupt the MPU so the page fault can be corrected and then re-execute the last instruction.

Yes I understand the 65C816 is better to use, but when I guess there are other processors ...

I only knows the basics about how an MMU works, so it had been nice to make a project with one to learn more about it.
From what I understand, when a page fault is found, the MMU send an IRQ to the processor and the processor must deal with it and reserve a memory page and after that continue on ...

Yes I planned to use the newest 6502 from WDC so it would have a static core. I'm not sure I understand the RDY pin 100%, but is it halting the processor in the middle of the operation or will it finish it first? I need to halt the processor in the middle of the command so that the address is output ...

Hi,
I want to create an simple MMU to a 6502 system and maybe it will stay as a basic mapper like the 74LS610 circuit or might be improved in the future (the mapper will be in a programmable IC so it can be improved).
One idea I had, which maybe is not working at all, would be to control the CPU ...

Zamuel, I assume you've seen Ruud's project by now (http://www.baltissen.org/newhtm/mmu.htm)?
After designing the PC-Card I decided to make a version for 6502 based computers. This design enabled the user to expand his computer to 16 MB using a 65816, a 74LS612 MMU or both. Unfortunately I found ...

If I understand it correctly you only need memory protection if the program can allocate memory during runtime that you can't know in advance. So in C language you can't use malloc in the program, but fixed arrays will be fine.
No, memory protection really needs to trap and translate the address ...

Hey! That thing works pretty good. Nice job!

Yes and it would open up new possibilities for creating stuff on the Atari (or other old computers to). The only problem is that it needs someone to write the games and that will probably not happen so I had planned to make it commercial, but if you ...

Hi, I'm new to this forum, but I have been looking around here for something like 10 years. I have built some smaller 6502 based projects and also Atari ST related stuff (I did a 3d graphic accelerator a few years ago https://www.youtube.com/watch?v=NzXxsK9Lg5E)

I have always wanted to make my own ...