PS✦

THE EMULATOR REPAIR CLUB

Pocket Signal

0 / 8cartridges restored

Little machines.
Big second chances.

Repair a tiny 8-bit CPU, one mysterious opcode at a time. Read the test traces, patch the chip, and bring eight lost pocket worlds back to life.
POCKET / 08SIGNAL LOST
AWAITING REPAIR8 BIT · 16 ROWS

CARTRIDGE 01

PROGRAM COUNTER00
ACCUMULATOR00000000
VIDEO ROWS0 / 16

The machine is quiet. Check the diagnostic traces on the right.

Inspect the cartridge ROM

LD sets the accumulator. Each unknown opcode transforms it. OUT sends its eight bits to the display. All arithmetic wraps to 0–255.

DIAGNOSTIC BENCH

Give each opcode its job.

These known-good traces survived. Pick the operation that explains every trace. Numbers are decimal; bit readouts are binary.

Choose a job in each chip socket.

The pocket CPU manual

WELCOME TO THE CLUB

Follow the traces.

Each cartridge has a broken opcode table. You decide what its numbered chips do. No coding needed.

  1. Read each chip’s known-good examples: accumulator A, operand N, and the correct result.
  2. Use the manual to choose a job in each chip socket. A job must explain all examples.
  3. Check patches for feedback, or boot the cartridge to watch your CPU run. Wrong results scramble the picture.
  4. Restore all 16 video rows. Rewind or change a patch to try again. Reveal one patch if you get stuck.

Examples: ADD with A=250 and N=10 gives 4, because bytes wrap at 256. XOR flips the bits set in N. Shift moves bits; rotate wraps the end bit around.