[TUHS] DECtapes under the UNIX room floor

[Phil Budne via TUHS]

> https://www.tuhs.org/Archive/Documentation/TechReports/USG_Library/1048_A_Continuous_Service_RTC_for_Digital_Computers.pdf

Looks like a combination of

Looks like a combination "RTC" (real time, "time of year" (TOY), or
"wall" clock) like the PC BIOS/CMOS clock chip (or an I2C RTC), which
by default uses line frequency, and ALSO an LTC (or line time clock)
interrupt source of "jiffies"

CTSS (the progenitor of both Multics and DEC timesharing systems) had
a "chronolog" device (attached as a magtape drive?) that supplied the
current time, month and day (but not year!), while even large (million
dollar) DEC timesharing systems in the 1970's and 80's expected a
human operator to be present to enter the date and time.

But I can understand AT&T wanting embedded billing systems to have
good timestamps!

I wonder: Was the VAX 11/780 the first DEC system that came with an
RTC/TOY clock out of the box?