Re: Apple II Interrupt card

[Exegete <millers@noneofyourbusiness.com>]

Michael J. Mahon wrote:
> In article <wUFea.1008$oY6.85397@news20.bellglobal.com>, Yves McDonald
> <""yves.mcdonald\"@NO SPAM sympatico.ca> writes:
>
>
> > > What was the no slot clock made of, and can that be used to create an int?
> >
> > The not-slot clock was an hybrid component consisting of clock 
> > hardware/socket/battery you would install between a ROM chip and its 
> > socket. Its interface was on a single bit (serial) and it would be 
> > transparent when reading EPROM.  A program (like ProDOS) could set and 
> > read time.  The battery let the chip tick while the computer is turned 
> > off.  It didn't have interrupt output or even a counter output since ROM 
> > chips are not connected to IRQ* line normally :)
>
>
> Which is fine, since no interrupt is required.
>
> Adam said that the 50/60Hz interrupt was used only to synthesize
> a "seconds" time of day clock, which is polled only in the idle loop.
>
> CONTIKI DOES NOT NEED INTERRUPTS!!!

I wouldn't have mentioned it Michael, except some have posted that it 
did. I certainly don't know one way or another.

IF however, interrupts are needed, or are a more efficent way to get 
Contiki to work (again, I'm clueless on this) this little card seems to 
be the cheapest way to go.

I'm almost sorry I tried to help....

Roy

> -michael
>
> Check out amazing quality 8-bit Apple sound on my
> Home page:  http://members.aol.com/MJMahon/



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