View Full Version : Is this an hour counter?

September 15th, 2017, 06:41 PM
In the second to the last picture:

http://www.ebay.com/itm/Vintage-Computer-PC-IMSAI-8080-/263198842886?hash=item3d47dfa006:g:ni4AAOSw9LxZtWB F

Is this some sort of time counter, like hours of use?

September 15th, 2017, 06:53 PM
It sure looks like it. The counter is driven by a synchronous motor.

September 15th, 2017, 07:31 PM
That is interesting - I haven't seen a counter like this on a computer before!

September 15th, 2017, 09:18 PM
I seem to recall that at one point the Teletype Corporation offered an hours meter for at least the ASR33. Still does not answer though why on earth an IMSAI would have one installed considering it would of cost pennies to operate and a few dollars to repair if it was a warranty thing.

September 16th, 2017, 10:07 AM
I knew a guy years ago (mid-1980s) that put hour counters on all his personal systems. No idea why, though.

September 16th, 2017, 11:24 AM
I've known guys over the years who put hour counters on everything they could. I don't recall any of them owning computers though.

September 16th, 2017, 12:15 PM
We have some rack mount Variacs at work, with hour counters on them. This thread has reminded me to wrangle them up and get them ready for sale.

That seems like a lot of hours on that IMSAI but we don't know what was already on the counter when it was retrofitted, nor how long it was used before the counter was added, so I guess it's more of a curiosity than a source of information.

October 1st, 2017, 01:47 PM
Yes, and looking at the finish on the bracket it came out of a Teletype

-pete Teleprinter collector