Apple 1 Lab
6502 / Woz Monitor — Learn 6502 assembly
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Lessons
Examples
Reset progress
Welcome to Apple 1 Lab
program.s
Assemble
Step
Run
Stop
Reset
Check ✓
Speed: 100 Hz
Hint
Step
Run
Reset
Follow PC
Registers
6502 flags: N V - B D I Z C. Bits 4/5 (B / unused) are software-visible via PHP/PLP.
Breakpoints
no breakpoints
Click a listing address to add/remove a breakpoint.
Memory
PC in blue. SP region ($0100+SP) in green.
Errors / Status
Woz Monitor active — type an address like
0: 12 34
or
0R
to run.
Exit to RAM
Apple 1 Screen ($D010)
Type a key (or paste):
Send ↵
Listing
Trace
Help
No listing yet — click "Assemble" to compile your program.