On 07/23/2016 11:56 PM, Segher Boessenkool wrote: > On Sat, Jul 23, 2016 at 09:21:26PM +0200, Gerrit Heitsch wrote: >> Forgot that in the last post... There is also the 6510T as used in the >> 1551 floppy drive. It has the full 8 Bit port. To me the pinout suggests >> that it's just a different bond out of the 6510: > > Or (more likely imnsho) 8500. Depends... On the later Chips, MOS included a number to the right of the datecode. From what we've been able to determine, if it starts with a '1', the Chip is NMOS and if it starts with a '2', the chip is HMOS-II. The other numbers are the revision and match the R-number if it's present on the chip. I have a few 6510 from after 1986 that have a '16' printed there, so they would be NMOS which would suggest the 6510T also to be NMOS since it's from 1984. > >> _______ _______ >> _RES [1 V ] Phi2 Phi0 [1 V ] _RES >> Phi0 [ ] R/_W _HALT [ ] Phi2 > > This is wrong btw, that #HALT pin is RDY. Where does that #HALT name > come from? Good question, it's been a long time since I wrote that. I'll change it. Still means the same though. RDY = HIGH => CPU is running. #HALT = LOW => CPU is stopped. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2016-07-24 05:00:02
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