Re: [cc65] Apple II No-Slot-Clock

From: Greg King <>
Date: 2006-07-02 09:47:46
From: Spiro Trikaliotis; on Tuesday, June 13, 2006; at 01:12 PM -0400
> Just out of curiosity:
> * On Mon, Jun 12, 2006, at 11:20:36AM -0500, Ben Sinclair wrote:
> > I have a no-slot-clock on the way for my Apple II ...
>            ^^^^^^^^^^^^^
> What is that?

Nobody has given an answer to that question; so, I will try to pull one
from the dim recesses of my (feeble) mind:

I think that I bought that product a decade ago, for my Commodore 64.  If
my faded memory is correct, then "No-slot Clock" is a nice-sounding
marketing name for a Dallas Semiconductor DS1216E SmartWatch.  It is a
piggy-back socket that sits between a motherboard and a ROM.  That
SmartSocket has a clock chip on it.  It can disconnect the ROM, and connect
that Real-Time-Clock, in place of the ROM.

There is no firmware (it doesn't use a peripheral slot).  It probably came
with an Apple II disk of software, but I can't remember (I couldn't have
used that disk).  Fortunately, I had Dallas Semiconductor's Product Data
Book; it told me how to control the SmartWatch.

I stuck it under the 64's BASIC ROM. (It became a very tight fit when I
added a JiffyDOS daughterboard!)  Commodore's ROMs have slightly
non-standard pin-outs; so, the SmartWatch and the ROM clashed.  But, I
could access the clock 95% of the time.

P.S.  Eventually, I had that clock, a second one in Creative Micro Design's
FD-2000 floppy drive, and a third one in their SmartTrak trackball.  I
never could make a final decision about which one to use for GEOS. :-)
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Received on Sun Jul 2 23:23:26 2006

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