On 2015-03-04 20:36, Jim Brain wrote: >>>> The CIAs are not as easy to implement as one would expect. Digitally >>>> yes, but then there's the analog side (the way the output drivers >>>> behave) that will be hard to duplicate with todays technology. Some >>>> programs use that with the CIA for the keyboard. >>> Example(s)? >> >> Don't have one at the moment.. It was a while ago we were discussing >> that in the forum64.de and someone mentioned that multiple key presses >> together with the resistance of the keyboard itself would be detected >> differently depending on the output driver technology. Someone else >> mentioned examples. > > That is true, but I didn't know of a title or util that leveraged that. But is this something fully reproducible? Or a kind of an esoteric behaviour? Like that one opcode that doesn't work well on R6502s but we still consider the CPU to be fully 6502 compatible. If this is somehow fully reproducible then it's a valid point when talking about "100%" compatibility. Still - in the worst case the output drivers could be reimplemented with discrete elements, couldn't they (yeah - footprint, of course)? I guess that's not like each one would require a huge number of components, right? -- SD! Message was sent through the cbm-hackers mailing listReceived on 2015-03-04 20:04:40
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