Instruction Format

Each instruction is a 32-bit word. It has three parts: a 4-bit opcode, a 1-bit addressing mode and a 27 bit address part.

    32   28    27                     0
    +----+-----+----------------------+
    | op | imm |         addresss     |
    +----+-----+----------------------+

The opcodes are:

• add m - A <- A + [m], CF set if overflow, ZF set if zero
• adc m - A <- A + [m] + CF, CF set if overflow, ZF set if zero
• sub m - A <- A - [m], CF set if underflow, ZF set if zero
• sbb m - A <- A - [m] - CF, CF set if underflow, ZF set if zero
• ior m - A <- A ior [m]
• xor m - A <- A xor [m]
• and m - A <- A and [m]
• ror m - A <- A rotated by [m] bits right
• jmp m - jump to [m]
• jz m - jump to [m], if ZF set
• jnz m - jump to [m], if ZF clear
• jc m - jump to [m], if CF set
• jnc m - jump to [m], if CF clear
• sto m - [m] <- A
• lod m - A <- [m]