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visual6502 bug report (irline3)
Posted: Sat Feb 02, 2013 8:19 pm
by cerebrum
From:
https://github.com/trebonian/visual6502 ... denames.js
irline3: 996, // internal signal: PLA input - ir0 AND ir1
But analysing the circuit I see that irline3 is actually ir0 OR ir1:
http://www.visual6502.org/JSSim/expert. ... &zoom=12.4
Edit: to clarify, the bug is just in the comment not in the code.
Re: visual6502 bug report (irline3)
Posted: Sun Feb 03, 2013 10:20 am
by BigEd
Quite so: 1133 is the output of a NOR and it's followed by an inverter.
You can watch the signals like this:
http://www.visual6502.org/JSSim/expert. ... 3&steps=40
I've sent a pull request to Barry: anyone could do the same, by using the 'Edit' button on github - you need to be logged in, but accounts are free.
Cheers
Ed
Re: visual6502 bug report (irline3)
Posted: Sun Feb 03, 2013 6:52 pm
by cerebrum
Good, didn't know that I could edit the source.
Re: visual6502 bug report (irline3)
Posted: Sun Feb 03, 2013 7:22 pm
by BigEd
Note that Barry won't necessarily act immediately to pull requests! And it's another step to publish. So please bear in mind this is a volunteer website. For many experimental purposes, running your own fork in a 'gh-pages' branch is a good way to proceed.
Cheers
Ed
Re: visual6502 bug report (irline3)
Posted: Mon Feb 04, 2013 10:22 pm
by BigEd
OK, that fix is deployed now. You may need to force a refresh.