HP-71 Compu-LS module

[Dave Frederickson]

(03-20-2017 05:53 PM)J-F Garnier Wrote:  

(03-20-2017 03:09 PM)Dave Frederickson Wrote:  Update: It loads just fine as a ROM using EMU71/DOS, I can CAT the 2 files. You will need to load it into an IRAM in order to be able to remove the protection, as emulated ROMs are also read-only.

Once you will have it in IRAM, here is how to unprotect it:
- find the ROM base address from the address of the file with ADDR$("COMPU")
- add an offset of 1c(hex),
- poke "0" in that location.
Or in one step: POKE ADDR$("COMPU")[1,3]&"1C","0"

Now, you can EDIT or LIST COMPU :-)

J-F

That's Bob's quote, not mine. I gave instructions for removing the file protection in Post 17, Step 4.

Dave