1 Aug
2004
1 Aug
'04
10:42 a.m.
On Sun, 1 Aug 2004, David V. Corbin wrote:
I have to disagree with you completely!
You are NOT being pedantic!
An RTC is indeed any source of information which can be used to monitor the
passage if time. It does not need to have any synchronization with "wall
time" at all.
The RTC may just provide an periodic norification that a certain amount of
time has elapsed [16.666mS for a 60Hz LTC] or may have register(s) for
accumulating a number of these events. If the processor contains built in
timers that can divide a clock signal, then any of these can be considered
an RTC.
Once any type of RTC exists, a computer can be programmed with a value which
matches the current "wall time" and use the information from the RTC to
update the wall time.
Right. So what I'm trying to determine now is whether the IBM 650 had an
internal hardware counter facility that could be accessed from within
software to allow for keeping time. And if not, were there any clock
products IBM made that could interface to the 650 to generate the local
time/date upon being polled?
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]