650X Schematic Notes
Notes on the original 650X schematics from MOS Technology, as safeguarded by Donald F Hanson.
In 1979, Donald F Hanson sought original design data for microprocessors and contacted several microelectronics companies. MOS Technology provided him with blueprint copies of two sheets which make up the logic diagram for a 6502-series microprocessor.
In 2011 he kindly forwarded scans of these two sheets to the visual6502 project and agreed that we could show details from them with a credit line as follows:
Credit: “MOS Technology, 1974-75, 6502 rev C, for educational use only.”
For further details of his improved modelling language for MOS design, see [his paper].
We thank Dr Hanson for these materials. Our analysis of the schematics follows below.
Chip Versions: 6501 and 6502
Chip Revision C, ROR Bug, Other Errors
- Donald F. Hanson, ["A VHDL Conversion Tool for Logic Equations with Embedded D Latches,"], Technical Committee on Computer Architecture Newsletter, pp. 49-56, Spring 1995, IEEE Computer Society.