Hello, * On Thu, Dec 08, 2011 at 10:04:29AM +0200 Marko Mäkelä wrote: > Thanks. FWIW, Jens Schönefeld posted the C64 PLA truth table on > German Z-Netz in the autumn of 1994. He had built an adapter that > makes the 82S100 PLA look like a 27512 EPROM. > > Back then, I managed to reverse engineer the equations for all > signals except CASRAM, which remained too complex to be plausible. > Verification was by a program that computes the truth table by > feeding all 65536 input combinations to the 8 equations, and by > comparing the resulting 64KB file with the PLA truth table dump. Interestingly, the output of your truth table equals the one in "64 intern" by Data Becker, if one changes some columns in the table of the book which were obviously mixed. Regards, Spiro. -- Spiro R. Trikaliotis http://opencbm.sf.net/ http://www.trikaliotis.net/ http://vice-emu.sf.net/ Message was sent through the cbm-hackers mailing listReceived on 2011-12-08 17:00:19
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