Wanted: HP-65 Quick Reference Guide

[John Cadick]

I am looking for a printed copy of the HP-65 Quick Reference Guide. If anyone has one that they can part with, please reply with a PM stating condition and price. I will get back to any who replies.

Thanks,

John

[PedroLeiva]

(03-18-2018 11:39 PM)John Cadick Wrote:  I am looking for a printed copy of the HP-65 Quick Reference Guide. If anyone has one that they can part with, please reply with a PM stating condition and price. I will get back to any who replies.

Thanks,

John

I can help only with this attach. Pedro

[Dieter]

(03-20-2018 02:01 AM)PedroLeiva Wrote:  I can help only with this attach. Pedro

Did the HP65 really support RCL-arithmetics, as stated in the PDF?
And did it return to step 00 if CL PRGM was pressed in run mode (like e.g. the HP25)?

Dieter

[Gene]

I don't think so on the CL PRGM.

[John Cadick]

(03-20-2018 02:01 AM)PedroLeiva Wrote:  

(03-18-2018 11:39 PM)John Cadick Wrote:  I am looking for a printed copy of the HP-65 Quick Reference Guide. If anyone has one that they can part with, please reply with a PM stating condition and price. I will get back to any who replies.

Thanks,

John

I can help only with this attach. Pedro

Thanks, Pedro.

[John Cadick]

(03-20-2018 02:02 PM)Dieter Wrote:  

(03-20-2018 02:01 AM)PedroLeiva Wrote:  I can help only with this attach. Pedro

Did the HP65 really support RCL-arithmetics, as stated in the PDF?
And did it return to step 00 if CL PRGM was pressed in run mode (like e.g. the HP25)?

Dieter

It does support RCL arithmetic. I expect that Gene is correct on the CL PRGM. I should receive my new (to me) 65 this week. I’ll check it and get back to you.

John

[Dieter]

(03-20-2018 02:45 PM)John Cadick Wrote:  It does support RCL arithmetic.

I tried this on the Panamatic HP65 emulator which is supposed to run the original firmware, and RCL-arithmetics do not work (as opposed to storage arithmetics). The museum's HP65 feature page confirms that only the latter is supported. So...?!?

Just to make sure what we're talking about:

Storage arithmetics:
4 STO 1
5 STO x 1 => 5
RCL 1 => 20

Recall arithmetics:
4 STO 1
5 RCL x 1 => 20
RCL 1 => 4

(03-20-2018 02:45 PM)John Cadick Wrote:  I expect that Gene is correct on the CL PRGM. I should receive my new (to me) 65 this week.

I think you will enjoy it. ;-)

Dieter

[Gene]

RCL arithmetic is not mentioned in the HP 65 owners manual, although STORAGE register arithmetic is mentioned.

My HP 65 emulator on my iPhone does have RCL arithmetic, but I can't say yet for the real machine.

[Craig Bladow]

(03-20-2018 02:02 PM)Dieter Wrote:  Did the HP65 really support RCL-arithmetics, as stated in the PDF?
And did it return to step 00 if CL PRGM was pressed in run mode (like e.g. the HP25)?

Dieter

My HP-65 does not support RCL arithmetic operations. If I press CL PGM in RUN mode and then switch to program mode '44' is shown which is the CL PGM instruction. Stepping only forward and going back to where one would expect to see '44' again, it is not there.

[Dieter]

(03-21-2018 03:47 AM)Craig Bladow Wrote:  My HP-65 does not support RCL arithmetic operations. If I press CL PGM in RUN mode and then switch to program mode '44' is shown which is the CL PGM instruction. Stepping only forward and going back to where one would expect to see '44' again, it is not there.

Same here on the Panamatic emulator. The behaviour you mentioned seems to be the same for other keys than CLEAR PRGM. Press ENTER, switch to PRGM mode and see 41. Which also disappears in the same way as you described.

Dieter

[teenix]

(03-21-2018 03:47 AM)Craig Bladow Wrote:  

(03-20-2018 02:02 PM)Dieter Wrote:  Did the HP65 really support RCL-arithmetics, as stated in the PDF?
And did it return to step 00 if CL PRGM was pressed in run mode (like e.g. the HP25)?

Dieter

My HP-65 does not support RCL arithmetic operations. If I press CL PGM in RUN mode and then switch to program mode '44' is shown which is the CL PGM instruction. Stepping only forward and going back to where one would expect to see '44' again, it is not there.

My emulator doesn't do RCL arithmetic either, but I cannot find any reference to RCL arithmetic, only STO arithmetic in the copy of the manual that I have.

All ROM is used in the HP-65 so maybe there was not enough room to support RCL functions.

The HP-65 puts all key press values into a buffer and when switched to W/PGM mode, this value is used to display the key coordinate of the last key pressed. It did not get stored in program memory because the key press was in RUN mode.

44 is the CLx button ie [f] [CLx] -> Clear PRGM

cheers

Tony

[teenix]

(03-21-2018 10:02 AM)teenix Wrote:  The HP-65 puts all key press values into a buffer and when switched to W/PGM mode, this value is used to display the key coordinate of the last key pressed. It did not get stored in program memory because the key press was in RUN mode.

I forgot to mention this process is all explained on pages 62 and 63 of the HP-65 owners manual.

cheers

Tony

[Dieter]

(03-21-2018 10:02 AM)teenix Wrote:  My emulator doesn't do RCL arithmetic either, but I cannot find any reference to RCL arithmetic, only STO arithmetic in the copy of the manual that I have.

Unsupported functions do not have to get explained in the manual. ;-)

(03-21-2018 10:02 AM)teenix Wrote:  All ROM is used in the HP-65 so maybe there was not enough room to support RCL functions.

As far as I know, at that time the HP45 was the only calculator to feature recall arithmetic. From that point on the latter was dropped, and it did not reappear until the HP15C – please correct me if I'm wrong here.

(03-21-2018 10:02 AM)teenix Wrote:  The HP-65 puts all key press values into a buffer and when switched to W/PGM mode, this value is used to display the key coordinate of the last key pressed. It did not get stored in program memory because the key press was in RUN mode.

Ah, very enlightening. Thank you for this explanation.

Dieter

[rprosperi]

(03-21-2018 10:06 AM)teenix Wrote:  

(03-21-2018 10:02 AM)teenix Wrote:  The HP-65 puts all key press values into a buffer and when switched to W/PGM mode, this value is used to display the key coordinate of the last key pressed. It did not get stored in program memory because the key press was in RUN mode.

I forgot to mention this process is all explained on pages 62 and 63 of the HP-65 owners manual.

cheers

Tony

When I read this thread yesterday I fired up Tony's HP-65 emulator and was surprised to see the '44' in the display, initially thinking there may be a bug. I would go back to RUN mode, GTO 0 and then SST through, and the 44 was gone. WTF??

So I broke down and looked into the manual, and it took a lot of looking (especially when one is inclined to think it's a bug anyhow) and then I finally found this explanation. Though I (probably) knew this in the distant past, I've completely forgotten this behavior, and as it never appeared again in any future machines, it was easy to forget.

Although we tend to think of the 65 as just a slightly simpler 67, it's easy to forget just how far the programming features and behavior advanced between the 65 and the Woodstocks in just a couple years.

No doubt lots of folks are also having refresher courses reading this too. Thanks, Dieter for those questions about the suspicious QRG contents.