B E T A B L O C K E R (C) 2010 Dave Griffiths 

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Betablocker is a 8 bit processor with 256 bytes of memory. It's capable only of playing music, and it's threads of execution (which share the same memory) never crash or cease execution.

You write into memory in order to edit programs literally as they are running.

Instruction Set

Instr Oper Push Pop  Description

----------------------------------------------------------------------------

NOP   0    0    0    Does nothing

ORG   0    0    0    Program start

EQU   0    1    2    Push 1 if top 2 items in stack are equal, otherwise 0

JMP   1    0    0    Sets program counter

JMP   1    0    0    If top is 0, sets program counter

PSHL  1    1    0    Pushes literal to stack

PSH   1    1    0    Pushes value at this address

PSHI  1    1    0    Indirect push address at address

POP   1    0    1    Pop stack to address

POPI  1    0    1    Indrect pop stack to address at address

ADD   0    1    2    Adds top 2 items and pushes result

SUB   0    1    2    Subtracts top 2 items and pushes result

INC   0    1    1    Increments top of stack

DEC   0    1    1    Decrements top of stack

AND   0    1    2    Pushes bitwise AND of top two stack items

OR    0    1    2    Pushes bitwise OR of top two stack items

XOR   0    1    2    Pushes bitwise XOR of top two stack items

NOT   0    1    1    Pushes bitwise NOT of tow stack item

ROR   1    1    1    Bitwise right rotate top of stack 

ROL   1    1    1    Bitwise left rotate top of stack

PIP   1    0    0    Increments addr in-place (push increment pop)

PDP   1    0    0    Decrements addr in-place (push decrement pop)

DUP   0    1    0    Duplicates top of stack

NOTE  0    0    1    Plays current instrument at pitch from top of stack

VOX   0    0    1    Changes current instrument to top of stack