Re: FPGATED

On Sun, Jul 24, 2016 at 06:43:15AM +0200, Gerrit Heitsch wrote:
> 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.

Great info, thanks!

I was thinking 1581 actually...  *facepalm*

1551 is from 1985, 1581 is from 1987.  Or so the net wants us to believe.

> >>                _______                 _______
> >>          _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.

Except during writes, etc.  But where did you get the name?  I've never
seen it before.


Segher

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