HP-9825B Desktop Calculator

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One of HPs first desktop calculators. More like a computer than calculator. Prgrammable in HPL.
printer works great I had to clean it out as typically have dissolved materials in there which prevent working almost not work great you can see it's producing the right answer I'm just multiplying four to five so the electronics is working great on this the tape drive on this still has a problem inside here there should be a light that's on that shines through the tape in replacing the capstone on here or somehow I got an intermittent connection or something and and so now the light inside doesn't shine through so we time you try to do a any kind of tape operation it'll it'll just give you the error of end of tape that's because that light it's just a loose connection I believe but I don't have time to take it apart and look for it like I say it was working the light was working until I replaced the cap seen

HP-9825B Desktop Calculator

10 thoughts on “HP-9825B Desktop Calculator”

  1. Man, I have one of these. Printer works on mine, but I have no tapes to try the drive with. They were made starting in 1976. The CPU was 16 bits, and ran at 10 MHz, which was actually faster than the first MACINTOSH computers built a decade later! Of course, the price of that speed in 1976 was that the CPU is under a heatsink that looks like a Honda motorcycle cylinder head! XD

    I'd love to get Hewlett Packard's HP 9100. It WAS HP's first calculator, made in 1968, using discrete components. The HP 9100 used resistor diode logic, and a bundle of transistors for flip flops. It had core memory, was fully programable, and had a 64 bit wide 32Kbit ROM made of zig zagging inductively coupled copper traces on a 16 layer PC board. Worked like a read only core memory!

  2. What blast from the past! I first programmed the 9825A in 1978 in the USAF. Even though it had 12K of memory and a tape drive, we managed to use it as a peripheral controller. Using the IEEE-488 bus, it was a powerhouse of the time. Maybe this was one of the computer we used in the AN/ALM126C SASE controller. Maybe someone out there might see this and remember? I worked at USAFTAWC/EC Test Center, Eglin AFB, FL. I did a lot of programming on this and I loved the hpl programming!!!

  3. hpl had r1-r99999 instead of basic letter-number variables. one-line display was first to do LOWER CASE, HP 9830 was upper case only. HP 9835 9845 were basic versions. Killed off by PC's, but HP is now world volume maker of pcs.

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