writes: The MOS 6502 microprocessor is famous among the vintage computing and classic gaming crowds. It was used inside the Apple II, the Commodore 64, the Atari 2600, and the Nintendo Entertainment System (NES). Need I say more? In 2010, the chip's 35th anniversary year, reverse engineers came out in droves and published more details about the 6502 than ever before—yes, really! For the assembly language crowd there is Michael Steil's excellent 50 minute talk on the 6502's architecture and instruction set delivered at 27C3, the video posted just yesterday. Or maybe you just want a quick read on 6502 history and some awesome reverse engineering efforts? Check out Russ Cox's blog. But if you are looking for the original 6502 netlist, accurate down to the last undocumented instruction, or want to run an animated 6502 chip simulation in your browser, you'll definitely want to visit Greg James, Barry and Brian Silverman's visual6502.org web site. These pied pipers have attracted an enthusiastic following of like-minded engineers who are now photographing and disecting even more classic chips.
writes: When a small team of reverse engineers receives the blessing of a big corporate legal department, it is cause for celebration. For the 38th anniversary of Intel's groundbreaking 4004 microprocessor, the company is allowing us to release new details of their historic MCS-4 chip family announced on November 15, 1971. For the first time, the complete set of schematics and artwork for the 4001 ROM, 4002 RAM, 4003 I/O Expander, and 4004 Microprocessor is available to teachers, students, historians, and other non-commercial users. To their credit, the Intel Corporate Archives gave us access to the original 4004 schematics, along with the 4002, 4003, and 4004 mask proofs, but the rest of the schematics and the elusive 4001 masks were lost until just weeks ago when Lajos Kintli finished reverse-engineering the 4001 ROM from photomicrographs and improving the circuit-extraction software that helped him draw and verify the missing schematics. His interactive software can simulate an ensemble of 400x chips, and even lets you trace a wire or click on a transistor in the chip artwork window and see exactly where it is on the circuit diagram (and vice-versa).Link to Original Source