Re: "SmartWatch" for No-Slot-Clock?

[dempson@actrix.gen.nz (David Empson)]

In article <31JUL199622595506@vax2.concordia.ca>, spec@vax2.concordia.ca
(Mitchell Spector) wrote:

>   I now have both of the above programs, however something odd is up.
>Both programs claim they _cannot_ detect a No-Slot-Clock when the chip 
>is installed in my Apple IIc Plus. Plugging it into one of my Apple IIc's
>(a ROM 255) detects it and lets me set the time/date. I've transplanted
>the NCS back into the IIc Plus, and it's retained the correct time and
>date thankfully, but why is this happening?

Have you disabled the accelerator?  The No Slot Clock operates by
appearing to modify the state of one bit of a ROM location (it provides a
64-bit serial data stream through this one bit).  The ZIP (or equivalent,
such as the IIc+) caches the ROM location, so the software never sees the
changing bit.

To access a No Slot Clock requires turning off the ZIP first.  The driver
may be doing this, but the time setting programs may not.

It _might_ be possible to install the NSC under a ROM on a slot card in
the IIe, which shouldn't be cached by the ZIP, but there aren't any such
ROMs in the IIc or IIc+.

-- 
David Empson
dempson@actrix.gen.nz
Snail Mail: P.O. Box 27-103, Wellington, New Zealand