What do we need for a "How to program the X16" book?

[Ed Minchau]

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.

[voidstar]

What!? How can you use 255 opcodes and still be called RISC 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.

[Ed Minchau]

What!? How can you use 255 opcodes and still be called RISC 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 some are three or four bytes.