Re: Apple II Interrupt card

[mjmahon@aol.com (Michael J. Mahon)]

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!!!

-michael

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