If this information is elsewhere in the forum, excuse me! I didn't find it.
In a post about a year ago in the thread Re: HP 30B not in blister pack Katie Wasserman wrote,
Quote:
....What's the date on the firmware?To check that:
1) Turn off
2) Press and hold PMT
3) Press ON
4) Press DOWN 4 times
Thanks, Katie
How interesting! My question is, what other power on key codes are there and what do they do?
Thank you,
Harry
Edited: 1 Oct 2011, 5:47 p.m.
Is there nothing online that lists the HP-30b/20-b self tests? Gee, I thought that Gene would have done that if not HP. At any rate they are:
- Screen Test, press INPUT to start and press to cyle through the 12 different displays
- Keyboard Test, press each key at least once in any order. Once they have all been pressed the test ends.
- Checksum, the number of the left side of the decimal point should equal the number on the right side of the decimal point.
- Battery Test, this is the voltage of the batteries. They are in parallel so it's sort of an average.
- Software Version, date of the firmware.
- Copyright message (also shows the amount of non-volitile RAM used by the firmware, should always be 2048, I think).
- Test System, pressing INPUT will toggle the test system on/off. The test system was used in development but when on will run the calculator somewhat faster and burn through batteries at lightning speed.
- Slow Clock, you can adjust the clock speed a little bit. I forget if this had a noticeable effect.
- Serial, I'm not sure. I think that this allows debugging of the serial interface that's used in the Test System.
Some of the above are guesses, please correct me if you know better.
-Katie
Edited: 1 Oct 2011, 8:20 p.m.
If you look into the sources of the SDK you can learn about the serial and test system stuff.