>If the answer is: a device that maintains the time of day independent
>of the computer power, the oldest I know of is the DEC KW11-W (?not
>sure about the suffix). I don't remember when that came out, but it
>probably predates microcomputers. It wasn't a popular option.
As I mentioned in another post, I think it was the KW11-C, and was a
unibus-only option. There was a KWV11-C, but I don't know if they
were associated. Early 80s.
BTW - this board also had batteries, so the clock would maintain
time across system power cycles (it charged the batteries when
the mains were on)
>Another example, from roughly the same era, is the TOY clock in the
>Pro-350. That's a microcomputer chip, so presumably some PC type
>system offered it as well. (That may apply to the KW11-W as well... I
>don't know.)
It was separate from the actual CPU chip... it might have been
something like a Dallas chip, so probably someone else was using
it as well. Mid 80s.
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL,ST| email: mbg at world.std.com |
| Member of Technical Staff | megan at savaje.com |
| SavaJe Technologies, Inc. | (s/ at /_at_/) |
| 100 Apollo Drive | URL:
http://world.std.com/~mbg/ |
| Chelmsford, MA 01824 | "pdp-11 programmer - some assembler |
| (978) 256 6521 (DEC '77-'98) | required." - mbg KB1FCA |
+--------------------------------+-------------------------------------+
Received on Thu Jul 29 2004 - 12:13:58 BST