Copies in code from Day 23 with new out command. This is a little rougher than Day 23 due to infinite loop nature of the default program. Therefore, I recommend you enter i === 29 for the Break On conditional.

Op codes

cpy x y

cpy x ycopies x (either an integer or the value of a register) into register y.

inc x

inc x increases the value of register x by one.

dec x

dec x decreases the value of register x by one.

jnz x y

jnz x y jumps to an instruction y away (positive means forward; negative means backward), but only if x is not zero.

tgl x

tgl x toggles the instruction x away (pointing at instructions like jnz does: positive means forward; negative means backward):

• • For one-argument instructions, inc becomes dec, and all other one-argument instructions become inc.
• • For two-argument instructions, jnz becomes cpy, and all other two-instructions become jnz.
• • The arguments of a toggled instruction are not affected.
• • If an attempt is made to toggle an instruction outside the program, nothing happens.
• • If toggling produces an invalid instruction (like cpy 1 2) and an attempt is later made to execute that instruction, skip it instead.
• • If tgl toggles itself (for example, if a is 0, tgl a would target itself and become inc a), the resulting instruction is not executed until the next time it is reached.

out x

out x transmits x (either an integer or the value of a register) as the next value for the clock signal.

Interactive Application 💻