Bruce Tomlin wrote:
In article <kKCdnXMGZogpR_XZRVn-qw@comcast.com>, "Michael J. Mahon" <mjmahon@aol.com> wrote:My mistake--from this chip photo, I incorrectly identified either the registers or the ALU as a PLA: http://micro.magnet.fsu.edu/chipshots/mos/6502large.htmlSee that mess of spaghetti in the middle? I think that's the instruction decoder.
It would actually be fun to see the real logic diagram of the 6502. ;-) All of the "internals" documentation I've found is very abstract with no detail where it would be most interesting. -michael Music synthesis for 8-bit Apple II's! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it is seriously underused."