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www visual6502 org please click above to allow blocked content javascript so that you ll be able to see the left nav bar on each page feel free to view our simple script at www visual6502 org main js to verify there is nothing harmful visual transistor level simulation of the 6502 cpu and other chips nbsp nbsp welcome to visual6502 org here we ll slowly but surely present our small team s effort to preserve study and document historic computers we aim to present our work in a visual intuitive manner for education and inspiration and to serve as a solid verifiable reference for classic computer systems see our slides for an introduction and some fun images have you ever wondered how the chips inside your computer work how they process information and run programs are you maybe a bit let down by the low resolution of chip photographs on the web or by complex diagrams that reveal very little about how circuits work then you ve come to the right place the first of our projects is aimed at the classic mos 6502 processor it s similar to work carried out for the intel 4004 35th anniversary project though we ve taken a different approach to modeling and studying the chip in the summer of 2009 working from a single 6502 we exposed the silicon die photographed its surface at high resolution and also photographed its substrate using these two highly detailed aligned photographs we created vector polygon models of each of the chip s physical components about 20 000 of them in total for the 6502 these components form circuits in a few simple ways according to how they contact each other so by intersecting our polygons we were able to create a complete digital model and transistor level simulation of the chip this model is very accurate and can run classic 6502 programs including atari games by rendering our polygons with colors corresponding to their high or low logic state we can show visually exactly how the chip operates how it reads data and instructions from memory how its registers and internal busses operate and how toggling a single input pin the clock on and off drives the entire chip to step through a program and get things done you can see this operation right now in your browser except for internet explorer earlier than version 9 with our interactive javascript simulation we suggest a fast computer and lots of memory for this version our project debuted on july 27th at siggraph 2010 los angeles see the slides from our siggraph talk and our abstract for more information our links lead to a wealth of information about the 6502 other processors and folks doing similar work our work is ongoing and involves much more than the 6502 check our wiki list of chips and blog for updates and links to all our material we ve received over 200 chips from donors and have decapped more than 100 of these as part of this work we ve combined a reconstruction of the atari 2600 tia with our 6502 simulation to produce frames of video from classic atari games we re reconstructing several classic sound and speach synthesis chips commodore 6581 and 8580 sid chips and ohers and we re working on polygons and simulations for many classic chips from zilog amd intel motorola general instruments texas instruments and others thanks for your visit we hope you enjoy our little slices of computer archaeology and history and please keep an eye out for historic equipment we might like to model especially broken or non functional chips and boards since these are perfect for our approach with a bit of work we can preserve the form and function of this hardware long after the actual devices have failed last update jan 8 2012 special update 250 000 unique visitors we re very happy to report that as of december 2011 in our 15 months on the web visual6502 org has had a quarter of a million unique visitors in this time we ve served over 2 tb of die shot and simulation data and thanks to a growing circle of dedicated enthusiastic folks we re taking on a wide range of projects 10 5 2011 steve wozniak steve jobs and their apple i our condolences to friends and family words cannot express their impact stay hungry stay foolish thank you