What Does MiSTer Mean For Saturn Reversing?

[slinga]

What does MiSTer mean for Sega Saturn reversing? I'm 100% a software guy, just wondering. Does it mean the interaction between the CD drive and the SH-1 are fully documented?

 

[Mr Conan]

It looks like he has documented some of the interactions on his github and posted assembly. (Not sure if its his own implementation or just a dump of the actual sh1 rom).

Saturn_hw/CDB at main · srg320/Saturn_hw

Contribute to srg320/Saturn_hw development by creating an account on GitHub.

github.com

I couldnt find his vdp verilog, that might be private. Maybe someone with access to his paetron would know if hes instrumenting the hardware or just basing his HW design on the existing docs/emulator logic

 

[slinga]

Thanks for the response. What else can we do with MiSTer? Can we take the verilog and verify SH-2 disassembly? Could there be non-standard opcodes?

Mister sounds really cool, dunno where to start.

 

[Mr Conan]

You could make an in-circuit emulator or jtag interface by modifying the SH-2 core, and yeah you could add whatever op codes you want since you are defining the processor. Just think of it as a modifyable saturn hw clone. The limiting factor will be space since the de10 nano uses a smaller fpga, and excess hw will affect routing. His SH2 src is here, missed it the other day. GitHub - srg320/SH