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Visual simulation of the 6502 CPU

www.visual6502.org Tools, games & demos Interactive tools & demos Hardware & electronics Candidate
Screenshot of www.visual6502.org captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 4 calendar years, with breakout response in 2 of them.

submissions
4
submitters
4
observed span
2012–2021
peak thread · 24 comments
129 pts
latest 20+ return · 2017-07-30
109 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

Any folks on here know of good resources that might help someone begin to understand what they're looking at here? More generally, learning about the physical operation of microprocessors? I'm particularly iffy when it gets to where the wires and the assembler meet, if you will.

It's a few years old now, but still quite interesting to play with. The CPU itself is only 3.5K transistors but already looks amazingly complex until you visualise how it's broken down into individual, mostly independent modules: http://forum.6502.org/viewtopic.php?t=2208&f=8 http://breaknes.com/ (The Russians seem to have a fondness for detailed IC reverse-engineering. There's a lot of Russian-only information on the internals of the 6502, 8080, 8085, Z80, etc.)

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
240

reference only — not used in Hall rules or ranking

Total comments
45

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2012-06-13Visual simulation of the 6502 CPUFirst breakout · Best threadgaoprea12924
2017-07-306502 transistor level hardware simulation in JavaScriptLatest 20+ point returndgellow10921
2020-01-23Visual Simulation of the 6502 Microprocessorkick10
2021-08-01Visual 6502 in JavaScriptbpierre10