Date   : Wed, 22 Jul 1987 23:44:00 MDT
From   : "Frank J. Wancho" <WANCHO@SIMTEL20.ARPA>
Subject: No-slot clocks

     There are now at least three sources for "no-slot" clocks, the
cheapest of which is from Radio Shack on sale for $39.95.  The problem
is that the software that comes with it is an executable for MSDOS.
There is no source and no technical documentation on how to program it
under some other environment, such as CP/M.
     Short of writing Radio Shack directly, does anyone have the
necessary info to make it work under CP/M?  *Can* it work under CP/M,
or does it take advantage of some MSDOS peculiarity?
     For those unfamiliar with these no-slot clocks (probably
somebody's trademark), it is a clock/calendar chip and a lithium
battery wedged into the cavity of a PROM socket and meant to be
sandwiched between an existing ROM and its socket, or simply plugged
into any empty 28-pin ROM socket you may have available.  Seems to
simple to be true...considering that I have a whole S-100 card devoted
to apparently the same function...

--Frank