https://microcorelabs.wordpress.com/202 ... ing-mcl65/

Small 6502 emulation project for some fun!

Well, it does break. Maybe it won't be an easy fix, although I haven't found any C emulator with all illegal opcodes.
You could take a look at my MCL64 which is a 6510 emulator written in C and supports the undocumented/unstable opcodes fairly well when used as a drop-in replacement into a ...

Well, it does break. Maybe it won't be an easy fix, although I haven't found any C emulator with all illegal opcodes.
You could take a look at my MCL64 which is a 6510 emulator written in C and supports the undocumented/unstable opcodes fairly well when used as a drop-in replacement into a ...

I just came across your amazing project ... Would it be doable to make it emulate the 65C816 ? I have an Apple IIgs with missing CPU that would LOVE it ... Thanks a lot for your work !

I believe the 65C816 is not footprint compatible with the NMOS 6502, so the MCL65+ would not be able to be ...

... implementation of the 8086 microcode in 6502 assembler ...
Yes, using the microcode as a template is one option, but what I meant was to just implement the MCL86 microsequencer's ALU in 6502 assembler and then run the MCL86 microcode as-is.

The MCL86 microsequencer runs the 8086 emulation ...

Another option could be to use my microcoded x86, the MCL86: https://github.com/MicroCoreLabs/Projects/tree/master/MCL86

The MCL86 uses a seven-instruction microsequencer to run the x86 emulation microcode and access the BIU (Bus Interface Unit). It probably wouldn't be too difficult to port the ...

I recently completed an 8088 emulator which can replace the CPU on an IBM PC. Source is simple-C and is on GitHub.

https://microcorelabs.wordpress.com

I developed a ROM emulator which uses a Teensy and can be programmed in C via the Arduino IDE which could be useful for your project.

https://microcorelabs.wordpress.com/202 ... -emulator/

I wanted to share a note I posted regarding new information gathered about the Terminator T800.

https://hackaday.io/project/182913-term ... -555-timer

Hmm -- I thought the C64 also allows the video memory (screen buffer) to be mapped anywhere in the address space.
I'm sure you are correct.

If video RAM can be "anywhere", and that's determined by the individual program at runtime -- how do you use internal RAM in the Teensy to accelerate the ...

I don't see why not. Cartridge ROMs and RAM blocks have already be emulated using the Teensy's large memory, so adding a paging system for a large memory expansion would probably be easy.

Safari also misaligned

One option could be to add some printf's to both my emulator code and yours to output an opcode sequence number, the PC and opcode, and the state of the registers. Both of our emulators should execute addresses and opcodes in lockstep so you could use the traces to see where our emulators begin to ...

I posted an update to the MCL64 project: https://microcorelabs.wordpress.com/202 ... 64-update/

It appears that a number of Commodore 64 games rely on a few of the unstable undocumented opcodes, so I updated the code to support them.

There are a few options for your 65F02 if you wanted to make it a tester:

You could use a modified version of my MCL65 which is a microsequencer based 6502 FPGA core with the entire 6502, including the ALU and the bus interface, implemented in microcode running on a seven instruction microsequencer ...