CARP

CARP stands for 'Canonian Analog Redstone Processor.' It is an esoteric programming language created by User:TheCanon2.

As the name implies, CARP is designed as a machine code for a hexadecimal Minecraft redstone computer.

Commands

CARP 1

CARP has fifteen 1-nibble (4-bit) registers with addresses 1 to 15. All CARP commands accept and require 2 operands, a register R and a line C. CARP has five commands.

Opcode	Symbol	Action
1	INC	If the value at R is 15, goto C. Else, increment and move 1 line forward.
2	DEC	If the value at R is 0, move 1 line forward. Else, decrement and goto C
3	CLR	Set the value at R to 0 and move 1 line forward
4	OUT	Output the value at R and move 1 line forward.
5	INP	Accept an input and write it to R and move 1 line forward

Line numbers start at 1 and increment by 1 for each line in the program. Halting is done by forcing a jump to line 0, for the physical decoder only activates when it receives a non-zero signal strength.

Examples

Addition program

INC r3 2 # r3 is used for control flow
INP r1 3
INP r2 4
DEC r2 6
DEC r3 9
INC r1 7
INC r3 8
DEC r3 4
OUT r1 10
DEC r1 0

Computational class

CARP can simulate a two-register Minsky machine.

INC r1 2 Increment register 1

DEC r1 3 Decrement register 1 and jump to instruction 2 unless it is zero in which jump to instruction 3.

However, CARP is a bounded storage machine due to its limited cell width.