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Stevetuc · 08-03-2022, 07:49 PM

(07-13-2022 06:42 AM)J-F Garnier Wrote:
(07-10-2022 02:47 PM)Stevetuc Wrote: This is discussed in an earlier archived thread.
https://archived.hpcalc.org/museumforum/...08646.html
Olivier De Smet has produced a rom patch with 224 registers and J F Garnier one with 192 registers.
Hopefully they will make the patches available on the forum.

Not only Olivier and I. Probably Eric Smith and HrastProg were the first ones to do it around 2006. And don't forget David (SwissMicros). For various (or obvious) reasons none has been published.

So yes, I have a 192-register patched version, that I first built for my private HP-15C emulator (emu15) in 2011.
I then tried the same patch set for the HP-15C emulator for Windows from HP, and fortunately it worked well meaning that the emulator allocates enough RAM space, probably the full 256-register space.
Since the HP emulator and the physical HP-15C LE are very close (even the PSE bug is "correctly" emulated), we can guess that the HP-15C LE also allocates the full 256-register space (it would be a very small gain not to do it, and would complicate the emulator code). But of course this is not guaranteed and must be tested.

Since my 2012 message, I also patched the MEM display to have a nice display for all memory partitions, not only the initial 94-99 allocation.
I didn't release my patched HP-15C XE (eXtended Edition) emulator yet, mainly because:
- the exe file was (still is) copyright HP,
- patching the exe file corrupts the HP digital signature, which may be interpreted as a potential risk.
Now, 10 years later, and as HP-15C LE ROM images have been published here, I think I can release my HP-15C XE emulator and the corresponding patch list, for "research and education purposes only".

Here is the patch list:

Code:

exe NUT org 64 reg ext 192 reg offset addr 19 - 46 94 - 99 1- memory size 30024 0356: 0c0 040 30036 035f: 310 110 3003A 0361: 350 250 3003C 0362: 090 350 3114A 0be9: 0c0 040 34600 2644: 350 150 34C42 2965: 0c0 040 34C48 2968: 0d0 050 34C54 296e: 0c1 041 34C5A 2971: 0c2 042 34C62 2975: 0c3 043 34DF2 2a3d: 0bb 03b 34E0C 2a4a: 0c0 040 2- MEM display fix 347f6 273f: 31c 3cd 347f8 2740: 361 0dc 347fa 2741: 024 03b 34800 2744: 27e 000 3695e 37f3: 000 1c6 36960 37f4: 000 016 36962 37f5: 000 381 36964 37f6: 000 0cc 36966 37f7: 000 260 36968 37f8: 000 03c 3696a 37f9: 000 2f6 3696c 37fa: 000 360 3696e 37fb: 000 276 36970 37fc: 000 3e0
exe offset is the position in the hp15c.exe file, NUT addr is the address in the NUT CPU ROM space.

Enjoy!

J-F

Thank you for posting this patch list. If you have any notes you can share to help understand the implementation of the memory size patch that would be great.