First computer with real-time clock?

On Mon, 02 Aug 2004 22:30:30 -0400 "David V. Corbin" <dvcorbin(a)optonline.net> wrote: IBM PC-DOS 1.0, for those who have never booted it, presents the user with a Time and Date prompt that can not be bypassed by simply hitting carriage return. The user can enter fictitious time and date if so desired, but not null. This was changed with later versions of PC-DOS and the parallel MS-DOS versions. You could simply hit return and default time/date values were assumed. I'm not sure if PC-DOS 1.0 supported autoexec.bat, which bypasses the Time/Date prompt on later versions (i.e. the Time/Date prompts are invisibly bypassed and a call to a small program that accessed the 'clock' hardware was not included (did anybody else back then feel like their machine was stunted if there wasn't a clock card plugged into an ISA slot on the machine?)) My point in bringing this up is to note that even though it didn't have a real-timekeeping function built in, an original IBM PC running PC-DOS 1.0 did have an inherent 'timekeeping' fuction which was often somewhat accurate. It didn't cost any more or less to enter the real time/date than a fictitious one, since some input with the right format was forced on system bootup. Granted, not many people at all ran IBM PCs on DOS 1.0, which was crippled in many other ways, and wasn't really that viable an 'OS' to run for several further releases. But back 'with the thread' being discussed, when I was in a programming class in college where we had to submit our FORTRAN decks to a batch terminal, there was definitely a high quality time and datestamp placed on the resulting printouts. This was on CDC Cyber hardware in the late 70's.