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RPL Calcs · (This post was last modified: 07-13-2016 01:38 AM by RPL Calcs.)

Does anyone have any other interesting link?
Post it here, please.

http://www.hpcalc.org/
http://users.skynet.be/luc.pauwels/luc/HP28

COVER BATTERY REPAIR
http://www.mpshp.com/hp28s
http://www.hpmuseum.org/forum/thread-5673.html

EMULATORS
IA32 platform
Emu28 http://hp.giesselink.com/emu28.htm (Free)
Emu42 http://hp.giesselink.com/emu42.htm (Free) (It has 28S emulation)

ANDROID platform
go28s https://sites.google.com/site/olivier2smet2/home/go28s (paid)

IOS platform
RPN 28x Calc http://tredje.se/rpn28xcalc.html (paid)

HARDWARE
http://users.skynet.be/luc.pauwels/luc/HP28/hardware
http://www.thimet.de/CalcCollection/Calc...28COM.html
http://www.hpmuseum.org/cgi-sys/cgiwrap/...i?read=313
http://www.hpmuseum.org/cgi-sys/cgiwrap/...i?read=275
http://www.thimet.de/CalcCollection/Calc...rared.html
https://www.defcon.org/images/defcon-16/...dspeed.pdf
http://www.thimet.de/CalcCollection/Calc...ption.html

INFORMATION
http://www.hpmuseum.org/hp28c.htm
http://www.finseth.com/hpdata/hp28c.php
http://www.finseth.com/hpdata/hp28s.php
http://www.hp-collection.org/calculators.html
http://www.keesvandersanden.nl/calculators/hp28c.php

MISCELLANEOUS
http://www.nic.funet.fi/index/misc/hp28s
http://www.ganjatron.net/retrocomputing/hp-28s
https://www.youtube.com/watch?v=gQ3Z6hUmEQg
https://www.flickr.com/photos/keithmidso...6354800664
http://www.thimet.de/CalcCollection/Calc...ntents.htm
ftp://ftp.ccl.kuleuven.ac.be/pub/hp28

NEWS AND DOCS
http://www.dtic.mil/dtic/tr/fulltext/u2/a236618.pdf
http://www.hp41.net/forum/fileshp41net/hp28sref.pdf
http://www.hp41.net/forum/fileshp41net/hp28sown.pdf
http://www.keesvandersanden.nl/calculato...ournal.php
http://www.courbis.fr/Voyage-au-centre-d...8-c-s.html
http://www.hpl.hp.com/hpjournal/pdfs/Iss...987-08.pdf
http://www.thimet.de/CalcCollection/Calc...erence.pdf

NEWSGROUPS
http://www.hpmuseum.org/forum
https://groups.google.com/forum/#!forum/....handhelds
https://groups.google.com/forum/?hl=en#!...p.sys.hp48

PROGRAMS
http://www.nic.funet.fi/index/misc/hp28s
http://xahlee.info/prog/hp28s/hp28s.html
http://www.hutter1.net/calculators/hp28s.htm
http://www.mpshp.com/hp28s/ProgramHP28S.pdf
http://www.vaxman.de/my_machines/hp/28s/28s.html
https://math.berkeley.edu/~ribet/Math115/99/clint4.pdf
http://canadacalling.ca/celnav/hpephemeridesprogv2.pdf
http://www.thimet.de/CalcCollection/Calc...ities.html

ROM ENTRY POINTS
HP28C - 1CC ROM http://hp.giesselink.com/Emu28/ENTRY28C.ZIP
HP28S - 2BB ROM http://hp.giesselink.com/Emu42/suprom28.zip

Important to read http://users.skynet.be/luc.pauwels/luc/H...e/syseval/
Interesting to read http://www.nic.funet.fi/index/misc/hp28s/syseval.util

SELF-TEST
http://www.rskey.org/~mwsebastian/selfte...t.htm#hp28

JoJo1973 · 06-22-2016, 05:30 PM

If you visit http://www.hutter1.net/calculators/hp28s.htm you'll be greeted with an automatic download of a MIDI tune called hp28.mid.

It was a bit surprising, but the tune is very catchy, with a nice synthpop feel: fans of 80's will appreciate! ;-)

JDW · (This post was last modified: 07-02-2016 02:49 AM by JDW.)

Why is emu42 not listed under EMULATORS? It has 28S emulation.

What is the difference between emu42 and go28s?

Note that your "new" ftp link is broken, or at least I get an error on my iPad:

http://ftp.ftp.ccl.kuleuven.ac.be/pub/hp28/

Do any of you use the 28S in emulation?

It seems there's no modern emulator for the Mac that runs under El Capitan, but it would be nice to see a Windows emulator support high resolution displays, such that I could use Wine on my 5k iMac to display the 28S (and other calcs) in actual size, photorealistic glory!

Lastly, the MIDI music mentioned by the previous poster doesn't play on the iPad.

RPL Calcs · (This post was last modified: 07-02-2016 02:45 PM by RPL Calcs.)

Quote:Why is emu42 not listed under Emulators? It has 28S emulation.

Sorry. I did not know. This has been corrected.

Quote:What is the difference between emu42 and go28s?

I just know that
Emu42 - free - IA32 platform
go28s - paid - Android platform

Quote:Note que your "new" ftp link is broken, or at least I get an error on my iPad:
http://ftp.ftp.ccl.kuleuven.ac.be/pub/hp28/

It was working before. It must have been taken out of operation.

Quote:Do any of you use the 28S in emulation?

I never used emulation to 28S before, I'm trying now.
But I'm having trouble getting work. I'm trying Emu28 in 64-bit Win7. :-)

Thank you for your questions. Anothers questions will also be welcome.
Best regards.

JDW · 07-02-2016, 07:45 AM

(07-02-2016 05:42 AM)RPL Calcs Wrote:
Quote:Note your "new" ftp link is broken, or at least I get an error on my iPad:
http://ftp.ftp.ccl.kuleuven.ac.be/pub/hp28/
It was working before. It must have been taken out of operation.

FTP links are not supposed to start with http://, therefore you need to check your original source.

(07-02-2016 05:42 AM)RPL Calcs Wrote: I never used emulation to 28S before, I'm trying now.
But I'm having trouble getting work. I'm trying Emu28 in 64-bit Win7. :-)

Do you have the HP-28S ROM? Without that, it won't work.

EdS2 · 07-02-2016, 08:07 AM

(07-02-2016 05:42 AM)RPL Calcs Wrote:
Quote:Note que your "new" ftp link is broken, or at least I get an error on my iPad:
http://ftp.ftp.ccl.kuleuven.ac.be/pub/hp28/
It was working before. It must have been taken out of operation.

Try here instead:
http://users.skynet.be/luc.pauwels/luc/HP28/

**rprosperi** · 07-02-2016, 02:39 PM

(07-02-2016 07:45 AM)JDW Wrote: FTP links are not supposed to start with http://, therefore you need to check your original source.

This is a known problem with the Forum software. You can't create a true ftp link, it gets munged into a non-working http: link. In this case, you can just show what the ftp link should be, without inserting a true link, so folks can copy/paste. Most likely, the correct link works, but I have not checked.

RPL Calcs · (This post was last modified: 07-02-2016 03:44 PM by RPL Calcs.)

Hello, Gentlemans.
Thank you for your replies.

In fact I did not use http//.
I pasted the address and the system put automatically the http// prefix.
This time, I used hyperlink quotes, so http// was not added.

I checked all links in 22-June-2016 (first post date), all links worked fine.

The original link is in the FTP Sites item, in
http://users.skynet.be/luc.pauwels/luc/HP28/
It also does not fuciona.

I believe the address ftp://ftp.ccl.kuleuven.ac.be/pub/hp28 is no longer active.

Quote:Do you have the HP-28S ROM? Without that, it won't work.

I'm trying to make a ROM dump (28s to 48gx).

Best Regards.

RPL Calcs · 07-12-2016, 04:20 AM

Hello, Gentlemans.
Two new links was added.

ROM ENTRY POINTS
1CC ROM http://www.hpcalc.org/details.php?id=5428
2BB ROM http://www.hpcalc.org/details.php?id=408

Best regards.

JDW · 07-12-2016, 04:33 AM

RPL Calcs,

I take it you were able to make a ROM dump of your 28S to your 48GX?

Christoph Giesselink · 07-12-2016, 03:50 PM

(07-12-2016 04:20 AM)RPL Calcs Wrote: Hello, Gentlemans.
Two new links was added.

ROM ENTRY POINTS
1CC ROM http://www.hpcalc.org/details.php?id=5428
2BB ROM http://www.hpcalc.org/details.php?id=408

Best regards.

A more recent version from above:

1CC ROM http://hp.giesselink.com/Emu28/ENTRY28C.ZIP

Entry point list in the same style like the 1CC one:

2BB ROM http://hp.giesselink.com/Emu42/suprom28.zip

RPL Calcs · 07-13-2016, 12:18 AM

Cheers, Mr Giesselink.

Thank you for your contribuisions.
The links was added (updated) in the Post #1.

Best regards.

JDW · 07-13-2016, 01:38 AM

RPL Calcs & Christoph,

Regarding the HP-28S, I am comparing this...

2BB ROM http://www.hpcalc.org/details.php?id=408

to this...

2BB ROM http://hp.giesselink.com/Emu42/suprom28.zip

But the content isn't quite the same.

What is all this for again?

Christoph Giesselink · 07-13-2016, 08:41 PM

(07-13-2016 01:38 AM)JDW Wrote: RPL Calcs & Christoph,

Regarding the HP-28S, I am comparing this...

2BB ROM http://www.hpcalc.org/details.php?id=408

to this...

2BB ROM http://hp.giesselink.com/Emu42/suprom28.zip

But the content isn't quite the same.

What is all this for again?

Just remember, the HP28 is a closed system with less public information and no public tools to write "System Objects". The offical way to call SysRPL-Objects is SYSEVAL from UserRPL. But the SYSEVAL numbers wasn't public at all, so some very enthusiastic people try to discover these secrects at end of the 80'ies. The list at http://www.hpcalc.org/details.php?id=408 is an example of such a work.

For the successor HP48SX soon after Joe Horn began his Horn Disk series. Around 1992 Joe published Horn Disk 4 which contain the HP-TOOLS, a collection of SysRPL-Compiler, Assembler, Linker, entry point list and documentation around SysRPL and Assembler programming especially for the HP48S(X).

The entry point list is a collection of the entry point names and the corresponding SYSEVAL address for use with the HP-TOOLS Assembler/Linker package. The delivered documentation tell for some entry point names the working and the input and output variable types.

There are no official entry point lists for the HP28C 1BB, 1CC or for the HP28S 2BB. Decades ago JFG began to write a 700 items large entry point list for the HP28S using the entry point names of the HP48SX. With the tools inside Emu42 I was able to increese the list to over 2500 items over the years.

So why we know that =SUB$ has address #041CF in the HP28 2BB ROM?

That's easy, we compared the ROM disassembly of the HP28S with the one from the HP48SX. If the dissassembly is equal we found the named entry point in the HP28 ROM. There're still many gaps in the HP28 ROM entry point lists, these are unnamed entry points or there's no source code equivalent in the HP48. Especially graphic output routines are affected by this.

So back to the entire question, with the entry point list at http://hp.giesselink.com/Emu42/suprom28.zip and the HP-TOOLS you can write SysRPL and assembly programs in the same style like writing such programs for the HP48. How you get such programs inside the HP28 is a different question.

tcab · 01-27-2019, 11:11 PM

I've just been having a great time exploring the RPN 28x Calc for iOS https://tredje.se/rpn28xcalc.html as it recently added programming support. I think the innovations it has added in the area of stack manipulation are worthy additions to the "philosophy" of stack based parameter manipulation and RPN computation.

For example you can select any item in the stack and the next operation takes its parameter from the selected item, not the top of the stack. I don't believe this has ever been done?

You can modify any item in the stack, drag to reorder items etc. It makes the stack much more friendly. Any future stack based calculators should look closely at this "state of the art" and incorporate similar features - IMO. Personally I've succumbed to algebraic notation most of the time, but if stacks ever came back into fashion, they would surely be more like this.