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+--- Thread: HP Pioneers ROM Dumping - Need help (/thread-13209.html)
HP Pioneers ROM Dumping - Need help - RPLman - 06-29-2019 09:00 PM
Hi Guys,
I'm following "Hp Pioneers Rom Dumping 0.2" Document.
https://www.hpcalc.org/details/7847
(5.3) Entering the program machine code - Very confusing.
I'm trying to Dump HP42s Rom.
There's a picture of a Hp27s showing the code entered at address 52000
all on one line. Is this correct?
I could enter one or two numbers in on one line, but I'm at a loss on how to type in more code on the same line, the memory scanner would jump to the next address before I could enter another piece of code
I seem to be missing information on how to navigate the memory scanner.
Can you please help.
Thanks
RE: HP Pioneers ROM Dumping - Need help - Dave Frederickson - 06-30-2019 04:56 PM
Wow! It was 5 years ago that we first encouraged Jose to learn how to dump a ROM.
https://www.hpmuseum.org/forum/thread-1580-post-15522.html#pid15522
(06-29-2019 09:00 PM)RPLman Wrote: There's a picture of a Hp27s showing the code entered at address 52000
all on one line. Is this correct?
Yes. The address increments as each digit is entered. Just enter the code as one long string of digits. Refer to the commands in Section 2).
Alternatively you can refer to the original document, here.
https://hp.giesselink.com/Emu28/CPROMUPL.ZIP
Additionally, a collection of ROM images can be found on the HHC 2018 flash drive. The 42S ROMs can be downloaded here.
https://drive.google.com/file/d/1m9Q3xlI7PyJoK_QMGjaYSe3M15lKBFKt/view?usp=sharing
Edit: Looks like the ROMs folder from the HHC 2018 flash drive needs to be added to the collection of torrents on hpcalc.org and other locations.
Dave
RE: HP Pioneers ROM Dumping - Need help - RPLman - 07-01-2019 12:19 PM
Hi, thanks guys,
Nice complete roms lost my copies to a dead HDD.
Anyhow still like to learn how to enter in this Assembly code and make my own rom, I'll keep trying for now. Help will be appreciated.
RE: HP Pioneers ROM Dumping - Need help - Dave Frederickson - 07-01-2019 03:23 PM
(07-01-2019 12:19 PM)RPLman Wrote: Anyhow still like to learn how to enter in this Assembly code and make my own rom, I'll keep trying for now. Help will be appreciated.
It sounds like you're having difficulty entering the dump program. Enable the memory scanner and change the address to 52000. The 42 displays:
52000:0000000000000000
Enter the first instruction, D2.
The 42 displays:
52002:0000000000000000
So the D is stored at 52000 and the 2 at 52001. The next digit will be stored at 52002 which matches the program listing taking into account the address offset.
Enter the second instruction 135.
The 42 displays:
52005:0000000000000000
When the next instruction D1 is entered it will be stored starting at address 52005.
Navigate back to the beginning of the program at 52000. The 42 displays:
52000:D213500000000000
There are the first two instruction D2 and 135 in sequence. Change the address back to 52005 and continue to enter the rest of the program, making the necessary changes for calculator model and ROM version.
Does that help?
Dave