On 12/13/2011 12:36 AM, Segher Boessenkool wrote: > > It would be rather easier to test for the difference between 8250 > and 8251 directly (see if the TOD is a BCD or binary counter). Done... I have one board that got repaired at one time. The 2 CIAs are marked as: 6526 1685 6526A 0287 206A I then used a simple program that wrote to the 1/10th sec register for the TOD to start it and ran a simple loop that just prints the contents of both seconds registers: 10 POKE 56328,0:POKE56584,0 20 ? PEEK(56329)" "PEEK(56585) 30 GOTO 20 The output is the same for both CIAs, they both count seconds and 'jump' (9 -> 16), meaning they are BCD. Therefore the '206A' marking doesn't indicate a 8520. >>>>> 5710 if I remember right. >>>> >>>> The 5710 from the 128DCR (and 1571CR)? >>> >>> That's the one. Pretty obvious how they came up with that chip name, >>> heh :-) >> >> Well... 5xxx = CMOS, x7xx = gate arrays. See also 5717, 5719 and 5721. > > Aww, but it fit so well :-) > > Is the 7 in 67xx/77xx/87xx the same thing? (I'm reading "gate array" > as "random logic", none of these devices are gate arrays). Along those lines... The x7xx-chips where always support logic. The 5710 stretches that a bit though if it really contains the WD177x core. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2011-12-13 20:00:04
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