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Welcome to the visualchips wiki.  Please see also [http://visual6502.org the visual6502.org site] which contains the backstory, [http://visual6502.org/links.html useful links], [http://visual6502.org/faq.html a FAQ], and a link to [http://blog.visual6502.org/ the project blog].
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We're all about reverse-engineering popular chips from the 70's and 80's - initially the 6502 but others too. This wiki is for documenting our findings and recording our sources, and is of course a work in progress.
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The [[JssimUserHelp|online help for our JavaScript simulator]] is also here, to help you get the most from that. (Note that it's only a switch-level simulator - our data also supports more accurate models. For most purposes, there's no difference.)
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= Projects and status =
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See also the [http://visual6502.org/links.html links] and [http://visual6502.org/donate_hw.html status page] on our [http://visual6502.org main website].
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For each chip, we follow these steps (see [http://visual6502.org/downloads.html the PDFs] for details):
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* get a chip, or more than one, which we can depackage
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* depackage it
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* take many photographs through a microscope of the metal layer
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* stitch into a single large image, correcting for distortions and overlaps
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* capture the polygons - at least for metal, usually also for contact cuts - into a data file
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* usually, deprocess the chip to expose the lower silicon layers
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* photograph, stitch and capture
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* convert the data files into a description we can simulate
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* investigate the behaviour of the chip by simulation
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* investigate the layout and logic design
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* write up our results on this wiki
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== MOS 6502 family ==
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We have photographs of the metal and lower layers, the polygons captured, the circuit extracted and we have published [http://visual6502.org/JSSim a javascript simulator].  There is an [https://github.com/pmonta/FPGA-netlist-tools FPGA project] to implement the simulation in hardware. We have (as yet) unpublished simulators in python and C.
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See the [[#6502 additional information|additional information]] further down this page
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== Zilog Z80 ==
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We have photographs of the metal layer, and have started capturing the polygons.  No public information yet.
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== Atari support chips ==
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* TIA (television interface adaptor) fully extracted and simulated, no data yet published.
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* ANTIC layout is in the process of polygon capture or netlist extraction. Primary data not yet published, but see [http://www.atariage.com/forums/topic/172580-antic-decap-and-reverse-engineering/ these] [http://www.atariage.com/forums/topic/136706-internal-antic-and-gtia-schematics/ threads].
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== Motorola 68000 ==
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We have photographs of the metal layer, and have started capturing the polygons.
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* [[Motorola 68000|68000 project page]] containing die photo and showing areas being captured
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This chip will need further deprocessing and photography for the lower layers.
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== Ferranti ULA family ==
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Ferranti ULAs were used in Acorn's BBC and Electron computers, and Sinclair's ZX81 and Spectrum.
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See [http://www.zxdesign.info/book/ Chris Smith's excellent book] for ULA background and lots of detail about the Spectrum ULA
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* Spectrum ULA: photographed, circuit manually captured, original sources not presently public
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* Electron ULA: photographed and stitched, nothing online yet
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* Tube ULA: we have a 'spare' chip, yet to be decapsulated
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= 6502 additional information =
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== Primary Sources ==
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* [http://visual6502.org/images/6502/index.html Photos of a MOS 6502D]
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* [[Atari's 6507 Schematics]]
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* [[Photos of R6502]]
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== Secondary Sources ==
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* [[Hanson's Block Diagram]]
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* [[Balazs' schematic and documents]]
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== Previous Analysis ==
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* [http://impulzus.sch.bme.hu/6502/letolt.php3 Beregnyei Balazs: 6502 Reverse Engineering] ([http://www.downloads.reactivemicro.com/Public/Electronics/Reverse%20Engineering/ translation])
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* [http://anyplatform.net/media/guides/cpus/65xx%20Processor%20Data.txt Mark Ormston: 65xx Processor Data (version 0.2b)]
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* [http://www.textfiles.com/apple/6502.bugs.txt Ivo van Poorten: 6502 Bugs List]
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* [http://www.llx.com/~nparker/a2/opcodes.html Neil Parker: The 6502/65C02/65C816 Instruction Set Decoded]
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* [http://www.oxyron.de/html/opcodes02.html Graham: 6502/6510/8500/8502 Opcode matrix]
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* [http://members.chello.nl/taf.offenga/illopc31.txt Freddy Offenga: 6502 Undocumented Opcodes]
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* [http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/6502-NMOS.extra.opcodes Adam Vardy: Extra Instructions Of The 65XX Series CPU]
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== Our Analysis ==
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* collected [[6502Observations|observations]] of 6502 layout and behaviour.
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* [[6507 Decode ROM]] (note that this describes the Atari 6507, not exactly the same as the NMOS 6502 used in the [http://visual6502.org/JSSim visual6502 simulator]
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* [[6502 all 256 Opcodes|all 256 6502 opcodes]] including illegals and their actions
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* [[6502 Stack Register High Bits|Stack Register]]
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====  ====
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</small>

Revision as of 17:41, 25 January 2011

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