OK, maybe I'm imagining this but I'm sure I once read an article that said the timer function on the hp-45 was put in by a bored student/intern
I've tried finding the article.
Does anyone else remember this?
Thanks
Dave
HP-45 Question
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09-12-2007, 04:48 PM
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09-12-2007, 08:24 PM
Discovered by a bored student/intern, maybe. I don't see how you could add code into a masked ROM. Best,
--- Les ▼
09-12-2007, 08:31 PM
Dave presumably meant that he'd read that the timer function had been added by a student intern working at HP. I hadn't heard that. I know one of the guys that worked on the HP-45, so I'll inquire.
09-12-2007, 08:53 PM
The code for the timer is already in the rom, they decided not to add the timer at nearly the last minute. The timer would not be so accurate because they did not include the crystal to control the clock speed (system clock) I think there is a set of three buttons you can press at one time to get it in and out of timer mode though. I just don't remember what they were. ▼
09-13-2007, 03:36 AM
Quote:IIRC, mine is off by approx. 20%, so *not so accurate* seems to be an euphemism ;-). I don't remember the keys either, but this information is easily found on the net.
09-13-2007, 04:59 AM
A similar story was for an "easter egg" for a ROM for the HP-85. I think someone put in a game. Perhaps this was a student and someone mixed up both features?
09-13-2007, 10:05 AM
My friend, here is quote from this site as how timer work.
Quote:
09-14-2007, 02:48 AM
My 45 prototype comes with a crystal installed - so the timer certainly wasn't a secret feature. It was probably killed by marketing or due to being pointless (what good for is a clock that only runs for a couple of hours until the batteries are down; since the 45 is non-programmable, you cannot do some funky calculations either...) |
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