Commander X16

What!? How can you use 255 opcodes and still be called RISC :P j/k (it's not) It's at least uniform instruction length? Sorting through the dynamic instruction length of the now-ancient System/3 was a pain. Nah. In fact, depending on operating mode, the same command can be two or three bytes, or so...

voidstar wrote: ↑Thu Nov 07, 2024 12:27 am The C is just for CMOS, right? Lower power and such? So subtle electrical differences, and who-knows-what "undocumented opcode" differences.

http://wilsonminesco.com/NMOS-CMOSdif/

I don't think there are any undocumented opcodes on the 816. They used all of them.

TomXP411 wrote: ↑Sat Nov 02, 2024 11:04 pm I would start with the Commodore VIC-20 User's Guide, which does an excellent job teaching BASIC. Then I'd modify the machine-specific instructions to work with the Commander.

I consider that book the gold standard.

Well, since r44 they've announced a second processor as a drop in replacement. So now the book needs to be twice as long.

Don't do it on the X16. Initially. There's a reason for this. There are countless C64 tutorials, books and tools available for nothing (there are for the X16 just fewer) which gives you a big choice at all levels, depending on how much knowledge you have ; everything from absolute basics through to...

Thanks for the very complete reply. Sorry for the slow respons. > Ah, VIC-20, that's a good one! Unfortunately, really starved on RAM... Yeah, I'm targeting the 16K expansion config. A Forth - or really any language - just wouldn't fit in 3K. Not unless it's like a crazy simple Assembly monitor or ...

Damn dudes. Unreal that this is on 6502.

Wow, first time I saw a still of that scene. It is bad form to have a label name which can also be interpreted as a hexadecimal value.

Why are the filenames listed like that? The file system doesn't do lowercase letters.

I've been working on a 3d first person shooter as well (on the back burner while I rewrite the META/L editor). My advice is to do as much precalculation as possible, and as few calculations at runtime as possible. For instance, I have 8 banks set aside for a single lookup table to convert a 16 bit d...