On 14 Mar 1999, Frank McConnell wrote:
#5 was the battery-backed-up real-time clock, and
I have this vague
recollection that #6 was something not directly on the card but
software which used the card, something like a RAMdisk driver.
I was joking when I said real-time clock since I thought the PC came with
a real-time clock. Is this not the case? Hmm, come to think of it, I
guess not since I don't see a battery on the MB of this 5150 here.
The real IBM PC and XT computers did not have a real time clock built in.
There were a number of third party cards that were available that provided
a RT clock as well as the stuff already talked about. Some of the clones
though did have a real time clock built in along with the associated
battery. The HeadStart is one that comes to mind, and I *think* the Leading
Edge Model D was another.