Insert ROM Chips
This is a genuine emulator, not a fake. It needs the three real C64 ROM images (you must supply them — they're copyrighted). Drop the files or click to browse.
SingleStepTests 6502 harness
Runs the community SingleStepTests/65x02 per-opcode fixtures (00.json–ff.json, ~10k cases each) against this 6510 core. No ROMs required. Cycle counts here are approximate, so cycle mismatches are reported but never fail a test.
Idle. Pick a range and hit Run.
COMMODORE 64
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💾 COMMODORE 1541 FLOPPY DRIVE
6502 · 2 KB RAM · 16 KB CBM DOS · 2× VIA 6522
Disk: (no disk)
Head track: 18.0
Motor: off
Density: 0 (tracks 1–17)
WProt: PROTECTED 🔒
Dev#: 8
IEC: ATN H · CLK H · DATA H
VIA 1 (U1) · $1800 — IEC serial bus
PA 00
PB 00
DDR a/b 00/00
PB: 0=DATA IN · 1=DATA OUT · 2=CLK IN · 3=CLK OUT · 4=ATN ACK · 7=ATN IN (→CA1 IRQ). PA0-3: device# jumpers.
VIA 2 (U2) · $1C00 — drive mechanics
PA 00
PB 00
DDR a/b 00/00
PA: GCR R/W head data. PB: 0-1=stepper · 2=motor · 3=LED · 4-5=density · 6=SYNC in · 7=write-protect in.
☢ MEMORY CORRUPTOR
CPU
PLA Banking
Disassembly @ PC
Memory
On-screen keyboard (tap keys). Physical keyboard also works. Esc=RUN/STOP · PgUp=RESTORE