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Dr Jefyll
PostPosted: Tue Nov 06, 2012 9:13 pm 
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Joined: Fri Dec 11, 2009 3:50 pm
Posts: 3354
Location: Ontario, Canada
Via Twitter, Jason Scott reports:
Quote:
MAME and MESS just completely rewrote their 6502 implementation. Crazy! (I mean, crazy GREAT, of course.)

Here is the link. For those (like me) unfamiliar with the terms, MAME = Multiple Arcade Machine Emulator. MESS = Multi Emulator Super System

-- Jeff
Code:
                          6502
                           |
        +------+--------+--+--+-------+-------+
        |      |        |     |       |       |
      6510   deco16   6504   6509   n2a03   65c02
        |                                     |
  +-----+-----+                            r65c02
  |     |     |                               |
6510t  7501  8502                         +---+---+     
                                          |       |
                                       65ce02   65sc02
                                          |
                                        4510

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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html
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ElEctric_EyE
PostPosted: Tue Nov 06, 2012 9:28 pm 
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Joined: Mon Mar 02, 2009 7:27 pm
Posts: 3258
Location: NC, USA
Multiple Arcade Machine Emulator is awesome, for the PC! If you have the ROMs that is... I've not played with MAME for over a year. Alot of the ROMs I was able to download from a website back then, not sure about nowadays though... The original Pacman was always hardest to find!

But what you have found here Dr. Jeff is awesome. This guy is committed! Still reading...

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65Org16:https://github.com/ElEctric-EyE/verilog-6502
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BigEd
PostPosted: Wed Nov 07, 2012 8:45 am 
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Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10800
Location: England
Excellent find! I see they used perfect6502 as a reference - that's the visual6502 simulator ported to C.

I had trouble squaring their verbal description of ASL Abs with the actual behaviour:
http://visual6502.org/JSSim/expert.html ... 0e0e0e0e0e
but it turns out I'd misread the description.
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