On Thu, 27 Jul 2000, Nicolas Welte wrote: > Since I was not sure of that anymore, I did a few quick tests on a 8500 > and a 6510 with a few peek and poke commands. The results are as > follows: > > - both the 6510 and 8500 have a full featured 8bit data direction > register at $00. > - bits 6 and 7 of $01 will always return 0 on reads if their > corresponding bits are set to 0 (input) in $00 > - bits 6 and 7 of $01 will return 1 for a certain time after writing > this value if set to output via $01 > - this time varies between the 6510 and 8500 due to their different > nature (NMOS/HMOS). The 6510 will retain the value not as long as the > 8500. This is probably a matter of micro to milliseconds (6510) vs > several seconds (8500). Brilliant, Nicolas! I'll see that this functionality finds its way into LUnix. I must admit, I really didn't think it would be possible to detect between 6510 and 8500. cbm-hackers does it again! This is why CBM machines are so satisfying to hack. Richard -- Richard Atkinson Software Engineer Tenison Technology EDA Ltd http://www.tenisontech.com/ - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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