M0

The M0 assembly language is the simplest assembly language you can create that enables the creation of real world programs with practical application. It includes only a single keyword: DEFINE and leverages the language properties of Hex2 along with extending the behavior to populate immediate values of various difference sizes and formats.

Thus a programmer is able to write a series of defines like so:

DEFINE LOADR 2E0
DEFINE LOADR8 2E1
DEFINE LOADRU8 2E2

and then use them to create a rather readable assembly program:

# We still support these comments
;; We also added support for hex inserts like so
:My_Global
'00440044'
;; And we also support strings, that we null pad to 4byte boundaries to make disassembly easier.
:My_String
"Hello world!"

:Prompt_Loop
	LOADXU8 R0 R3 R4            ; Get a char
	CMPSKIPI.NE R0 0            ; If NULL
	JUMP @Prompt_Done           ; We reached the end
	FPUTC                       ; Write it to TTY
	ADDUI R3 R3 1               ; Move to next char
	JUMP @Prompt_Loop           ; And loop again

And more impressive programs have been created in it such as C compilers. such as the cc_* family of C compilers written in assembly.