Basic Opcodes

• SET a, b sets a to b
• ADD a, b sets a to a+b, sets O to 0x0001 if there's an overflow, 0x0 otherwise
• SUB a, b sets a to a-b, sets O to 0xffff if there's an underflow, 0x0 otherwise
• MUL a, b sets a to a*b, sets O to ((a*b)>>16)&0xffff
• DIV a, b sets a to a/b, sets O to ((a<<16)/b)&0xffff. if b==0, sets a and O to 0 instead.
• MOD a, b sets a to a%b. if b==0, sets a to 0 instead.
• SHL a, b sets a to a<>b)&0xffff
• SHR a, b sets a to a>>b, sets O to ((a<<16)>>b)&0xffff
• AND a, b sets a to a&b
• BOR a, b sets a to a|b
• XOR a, b sets a to a^b
• IFE a, b performs next instruction only if a==b
• IFN a, b performs next instruction only if a!=b
• IFG a, b performs next instruction only if a>b
• IFB a, b performs next instruction only if (a&b)!=0

Non-basic Opcodes

• JSR a pushes the address of the next instruction to the stack, then sets PC to a
• BRK stops execution (non-standard)

Registers

• A, B, C, X, Y, Z, I, J

Other Values

• POP / [SP++]
• PEEK / [SP]
• PUSH / [--SP]
• SP, PC, O