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visual 6502 simulator
Posted: Sat Sep 18, 2010 12:24 pm
by dXtr
havn't been around so sorry if this have already been posted.
just saw this cool visual 6502 simulator
http://visual6502.org/JSSim/index.html
Posted: Sat Sep 18, 2010 1:24 pm
by Memblers
I haven't seen that, that's really cool though!
If you look around on their site, they've also done the TIA of the Atari 2600, and have gotten some video out of it.
The NES is on their donation wish-list, so maybe he'll do the NES PPU and CPU. I had at least one broken NES, but I already removed the CPU and sent it off for a similar kind of analysis (I don't know if it's affiliated with that site). I've got plenty of PPUs though.
Posted: Mon Sep 20, 2010 11:07 am
by sleepy9090
oops didnt see it already posted, my fault
still neat
Posted: Mon Sep 20, 2010 4:27 pm
by sahib
very interesting. albeit, it brings my system to a crawl.
I'd love to see a similar visualisation of the PPU.
Posted: Mon Sep 20, 2010 6:43 pm
by Jarhmander
sahib wrote:very interesting. albeit, it brings my system to a crawl.
I'd love to see a similar visualisation of the PPU.
I'm sure we'll discover some other bugs in it
Posted: Mon Sep 20, 2010 7:39 pm
by 3gengames
~J-@D!~ wrote:sahib wrote:very interesting. albeit, it brings my system to a crawl.
I'd love to see a similar visualisation of the PPU.
I'm sure we'll discover some other bugs in it
Anyone by any chance have the PPU drawn out in just standard chips? If so, getting the parts and building your own would be cool....and a good alternative to mod the PPU to do RGB without destroying a harder to find and more expensive arcade PPU. :3
Posted: Fri Oct 01, 2010 11:56 am
by clueless
The blog over at "pagetable.com" has a few recent articles about the 6502 that might interest some of you.
http://www.pagetable.com/?p=410 Internals of BRK/IRQ/NMI/RESET
http://www.pagetable.com/?p=406 Measuring the ROR Bug in the Early MOS 6502
http://www.pagetable.com/?p=401 Measuring the Entropy of the MOS 6502 CPU
Posted: Fri Oct 01, 2010 12:24 pm
by thefox
Cool! I was just thinking about the BRK/IRQ/NMI/RESET behaviour yesterday.
Posted: Wed Dec 29, 2010 2:54 am
by hyarion
the guy how has pagetable.com made a speak at 27c3 yesterday, really interesting stuff.
most of the undocumented opcodes aren't that undocumented anymore
you can read more about it here:
http://events.ccc.de/congress/2010/Fahr ... 59.en.html
stream dumps are available here:
http://events.ccc.de/congress/2010/wiki ... treamdumps
the talk was in saal1 ~12:45 2010-12-28 (day 2)
(some servers uses the time and place as filename)
Posted: Thu Dec 30, 2010 11:47 pm
by lidnariq
Did anyone else notice from the 27c3 video that in the die shot of the 2A03 the 6502 was a small portion of the total die space -- maybe 1/3 to 1/4? Makes me question some of our guesses "oh, they probably did that for space"...