Instruction Set

Instructions are 1-3 words long and are fully defined by the first word. In a basic instruction, the lower five bits of the first word of the instruction are the opcode, and the remaining eleven bits are split into a five bit value b and a six bit value a. b is always handled by the processor after a, and is the lower five bits. In bits (in LSB-0 format), a basic instruction has the format: aaaaaabbbbbooooo

In the tables below, C is the time required in cycles to look up the value, or perform the opcode, VALUE is the numerical value,NAME is the mnemonic, and DESCRIPTION is a short text that describes the opcode or value.

Values: (5/6 bits)

• "next word" means "[PC++]". Increases the word length of the instruction by 1.
• By using 0x18, 0x19, 0x1a as PEEK, POP/PUSH, and PICK there's a reverse stack starting at memory location 0xffff. Example: "SET PUSH, 10", "SET X, POP"
• Attempting to write to a literal value fails silently