On 02/25/2014 07:07 PM, Bil Herd wrote: > Yeah I remember the 3 seconds where I made the mistake on hiding the > register in the VIC. I thought to do a “lock the door and throw away > the key” approach where only a cold start would bring it back in. Judging from the schematics, the C128 has a signal (labeled '64/128') that seems to tell some of the logic what mode it is in. That could have gotten used together with an unused pin (which it has as far as I know) on the 48pin VIC to 'disappear' the registers in C64 mode. That would also have prevented getting stuck with the registers gone in C128 mode. > But then we never said it was 100% compatible. >:) That's why I wrote 'almost'. It was still impressive. > (we had a LOT of 7406/7s) So I see... and most of them from Russia (EL74xx). Gerrit Message was sent through the cbm-hackers mailing listReceived on 2014-02-25 19:00:32
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