Gigatron Hackers

It probably is out of date, (though it shouldn't have been). The best way to verify the opcodes is to use the actual ROM source at ROMvX0/Core/ROMvX0.asm.py Search for "$0300" to get to the intrinsic instructions. Search for "0x2200" to get to the PREFX3 instructions. Search for ...

Welcome, pretty cool design.

You can't post into someone else's Contrib without their permission, so the only place left is your own.

This is excellent, especially the second version!

You've found a couple of issues here: From SYS-functions.txt: Naming ------ The naming convention is: SYS_<CamelCase>[_v<V>]_<N> With <N> the maximum number of clocks or cycles (not ticks!) the function will need, counted from NEXT to NEXT. This duration <N> must be passed to the 'SYS' vCPU instruct...

Welcome to the forums, you sure can!
https://github.com/kervinck/gigatron-rom/pulls

Looks and plays great!

That's correct Xpp is a post increment of X, the increment happens after the operation

Emulator: Various HW/SW links:

Yes that's correct.

Documentation is here: You can also single step through ROM source code in my emulator package and watch exactly how the native instruction works.