Online HP-45 Emulator - First calculator with a shift key

[van2z]

After building the HP-35 calculator, I was looking if there was any low hanging fruit for me to reuse the same code. I found the HP-80 used exactly the same hardware, but I couldn't find the ROM.

I see Brouhaha seems to have manually copied each assembly instruction from the original patent into his Nonpareil code, but I don't have an easy way to compile that to see the ROM binary. If anyone can do this, it would be appreciated.

Moving on after the HP-80, was the HP-45, for which I was able to find the ROM binary, also from Brouhaha, here.

The hardware here was also very similar. The main difference is the inclusion of a "data storage" chip, giving the calculator an extra 560 bits to use. Here it is:

https://veniamin-ilmer.github.io/hp45/

I have never used this calculator before. I see it starts out using fixed notation 2. If anyone has used this calculator before, please let me know if it is functioning properly, or if you see any issues.

[Thomas Klemm]

(12-28-2023 06:15 PM)van2z Wrote:  I found the HP-80 used exactly the same hardware, but I couldn't find the ROM.

You may have to build the nonpareil project and use uasm to compile 80.asm into an object file.

You can find here the: 70.rom.
This is another calculator that used the same chip.

From HP-45:

Quote:The timer could be invoked by pressing RCL and then pressing CHS 7 8 all at the same time.

Not sure if this is possible, but it would be cool if the timer could be started.

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Addendum: If found them here: ROMs

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Relevant: HP-80 Nonpareil Emulator: fixed a bug in the calendar functions
IIRC the bug was present in his iPhone app.
Thus you might have to apply the patch.

[van2z]

Thank you Thomas for the ROMs! I will be looking into them a bit later.

After a bit of searching, I found these simultaneous key presses trigger as if pressing a nonexistent key code 60.

Although this does switch it into timer mode, it seems buggy. It doesn't seem to work correctly. I am trying to figure out if this is an issue in the emulator or the ROM.

I have to go right now. I don't want to leave you hanging, so I added a button at the bottom to trigger the timer mode. You still have to press RCL before pressing the timer button to get it to switch modes.

[van2z]

This Timer feature has revealed a few issues in my emulation, which is great.

I fixed a lacking decimal issue. Tomorrow I'll tackle the sticky keys and blinking display.

The timer works, but for now you just might need to click buttons a few more times to get them to work. (CHS is start / stop. CLX clears the count).

[toml_12953]

(12-28-2023 10:23 PM)van2z Wrote:  This Timer feature has revealed a few issues in my emulation, which is great.

I fixed a lacking decimal issue. Tomorrow I'll tackle the sticky keys and blinking display.

The timer works, but for now you just might need to click buttons a few more times to get them to work. (CHS is start / stop. CLX clears the count).

Note that the 45 lacked a crystal for the timer so it was very inaccurate unless you opened it up and installed the correct crystal yourself.

[van2z]

I do like that the timer seems relatively accurate. This shows me the emulator is getting timing the CPU instructions accurately. I'll look into adding a crystal when emulating the HP-55.

[Namir]

I noticed a bug in the HP45 enulator. The RCL 0 does not work.

Also when you do CHS and the value in the X register is 0, the emulator should ignore the CHS command.

Namir

[teenix]

(12-29-2023 07:51 AM)Namir Wrote:  Also when you do CHS and the value in the X register is 0, the emulator should ignore the CHS command.
Namir

I'm not sure but this might be due to HP-45 revisions. My simulator shows a negative sign when 0.00 is displayed, and also a real HP-45 that I have here (serial 1349S 11201)

cheers

Tony

[Thomas Klemm]

(12-29-2023 08:15 AM)teenix Wrote:  My simulator shows a negative sign when 0.00 is displayed, and also a real HP-45 that I have here (serial 1349S 11201)

Here's another HP-45 Emulator that shows the same behaviour.

[Namir]

You guys are right. The minus zero is part of the hp-45.

[Thomas Klemm]

(12-28-2023 07:22 PM)Thomas Klemm Wrote:  Thus you might have to apply the patch.

That's already done.
The commit message of 4217291 from Jul 4, 2014 is:

Quote:Patch to HP-80 ROM, which solves DATE function bug. Patch provided by…
… Thomas Klemm.

[van2z]

Hey folks, I fixed up the sticky keys and display issues. The timer works great now.

This also fixes an issue I missed earlier with mobile users getting a delayed touch response. This has been resolved for both HP-35 and HP-45 emulators.

Happy new years everyone. See you next year.