New machine language port

[Joe Horn]

If you're compiling using the 50g's built-in assembler, then you have a setting wrong somewhere*, or a syntax error (e.g. a missing final "@"), because the mnemonics you listed are valid in the 50g.

On the other hand, if you're using a non-HP assembler, you might need an HP<>AG translation table, such as the following:

http://holyjoe.net/hp/ROSETTA.TXT

For example, if you look up the D1=A mnemonic, you'll see that it's a valid HP mnemonic, whose AG equivalent is MOVE.A A,D1. Explanations are at the top of the file.

* EDIT: One setting which makes a difference is flag -92: Set means "MASD SysRPL mode" and clear means "MASD asm mode".

EDIT 2: ASM assembles the following (useless Code object) correctly in SysRPL mode (when flag -92 is set):

"CODE
D1=A
ENDCODE
@"

ASM assembles the the following into the same (useless) Code object when flag -92 is clear (asm mode):

"D1=A
@"

Do not run that Code object; it's just an example of using one of the opcodes you listed.