5iasm

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5iasm stands for "5 Instruction ASseMbly language". Like the name suggests, it has 5 commands.

Instructions

Instructions:

Mnemonic	Meaning	What it does
inc [register]	INCrement	Increments a register
dec [register]	DECrement	Decrements a register
jmp [line]/[label]	JuMP	Jumps to a line or a label
isz [register]	Instruction Skip if Zero	Skips the next instruction if register is 0
stp	SToP	Halts

The first line in program is line 1. There are 10 registers : A,B,C,D,E,F,G,H,X, and Y. There are three special registers:

Special registers

Name	Action on read (by isz)	Action on write(by inc or dec)
I	Prompts one-character input (like brainfuck.) EOF=0	Acts like a normal register but is set to the last inputted value after input.
O	Returns 1	Prints its contents as a Unicode character
N	Returns 0	After operation,if the contents is divisible by 3, enable I/O. This is used to output higher ASCII values without printing the lower values

Labels and comments

To define a label:

label:

To jump to a label:

jmp label

Comments:

;comments are prepended with semicolons

Examples

Addition

; Clear C
clearC:
isz C
jmp decC
jmp clearX
decC:
dec C
jmp clearC
; Clear X
clearX:
isz X
jmp decX
jmp processA
decX:
dec X
jmp clearX
; Copy A to X and C
processA:
isz A
jmp inc
jmp restoreA
inc:
dec A
inc X
inc C
jmp processA
; Now A is in X and C, but A=0
; Now restore A from X
restoreA:
isz X
jmp incA
jmp processB
incA:
inc A
dec X
jmp restoreA
; Now we copy the value from B to X and C
; X is 0, so it becomes a backup copy again.
; And in C is the sum afterwards.
processB:
isz B
jmp inc2
jmp restoreB
inc2:
dec B
inc X
inc C
jmp processB
; We restore the value in B from X.
restoreB:
isz X
jmp incB
jmp done
incB:
inc B
dec X
jmp restoreB
; Done.
done: 
stp

Cat Program

A perpetually repeating cat program shall be demonstrated below:

repeat_program:

; Query input.
isz I

; Disable input/output.
inc N

; Handle special case of EOF input, which omits copying to the
; output register.
isz I
jmp copy_input_to_output
jmp print_input

; Copy input register value to output register.
; The register 'A' applies itself to an adminicular role, employed
; for a conditional skipping via 'isz A' during the 'O' register's
; resetting to zero (0).
copy_input_to_output:
inc O
inc A
dec I
isz I
jmp copy_input_to_output

; Adjust for supernumerary output register incrementation.
dec O
dec A

print_input:
; Enable input/output.
dec N
; Print input stored in output register.
inc O
inc A

; Disable input/output.
inc N

; Reset output register to zero.
reset_output_register:
dec O
dec A
isz A
jmp reset_output_register

; Enable input/output.
dec N

jmp repeat_program

Interpreter

• Common Lisp implementation of the 5iasm programming language.