+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: General Forum (/forum-4.html)
+--- Thread: HP-41CY re-initialization ROM (/thread-13880.html)
RE: HP-41CY re-initialization ROM - J-F Garnier - 12-25-2019 09:21 PM
(12-24-2019 08:18 PM)Sylvain Cote Wrote: I just received my first 41CY (64K) with -RAMBOX 64b ROM.Bravo !
If you do PG<> then you should see -RAMBOX 64a , at least it is how it works in Emu41 :-)
Quote:I have the manual for the RAMBox unit but I do not have one for the 41CY in English.Look for "41CY" on the TOS :-)
What are the instructions that does what the switches do on the RAMBox ?
J-F
RE: HP-41CY re-initialization ROM - Sylvain Cote - 12-26-2019 12:42 AM
(12-25-2019 09:21 PM)J-F Garnier Wrote: Bravo !Merci!
(12-25-2019 09:21 PM)J-F Garnier Wrote: Look for "41CY" on the TOS :-)I had looked and found the German version of the 41CY manual but not the English version.
Anyway, I did an OCR scan of the manual and with the help of Google Translate, I was able to get the information that I needed.
(12-25-2019 09:21 PM)J-F Garnier Wrote: If you do PG<> then you should see -RAMBOX 64a , at least it is how it works in Emu41 :-)After reading the manual translation, I tried the functions (PG<>, PG10, PG01) to switch the banks.
The result was that CAT2 stopped working correctly.
After that, I tried a Memory Lost and asked the 41CY to clear its QROM, but to no avail.
So, I will need to follow Jürgen procedures to reinstall the whole thing correctly.
I am still searching how to disable QROM pages with the 41CY like it is possible with the RAMBOX & RAMBOX II.
If not, i will experiment with physical modules to see how the system behaves. (bus contention, etc)
Sylvain
RE: HP-41CY re-initialization ROM - Raymond Del Tondo - 12-26-2019 07:54 PM
(12-26-2019 12:42 AM)Sylvain Cote Wrote: I am still searching how to disable QROM pages with the 41CY like it is possible with the RAMBOX & RAMBOX II.Short answer: Not possible with the CY.
It's the trade-off for having it all inside instead of mounted externally;-)
The only switches in a CY are the Turbo switch and the write protection switch for page 8,
where the RAM-Box OS resides normally.
To override ill-behaved RAM pages you could try with a couple (better quadruple) of 8K ROM modules,
like the Petroleum or Math/Stat pacs.
However if the calc hangs after trying to switch banks then the best thing
is to wipe out that bank completely, and reinstall using Jürgen's method.
I could also revive your CY easily, but if you have a Clonix,
Jürgen's method may be cheaper, since you can do it yourself;-)
RE: HP-41CY re-initialization ROM - Sylvain Cote - 12-27-2019 06:59 PM
(12-26-2019 07:54 PM)Raymond Del Tondo Wrote:Bummer(12-26-2019 12:42 AM)Sylvain Cote Wrote: I am still searching how to disable QROM pages with the 41CY like it is possible with the RAMBOX & RAMBOX II.Short answer: Not possible with the CY.
(12-26-2019 07:54 PM)Raymond Del Tondo Wrote: It's the trade-off for having it all inside instead of mounted externally;-)Not happy about it, but I understand.
(12-26-2019 07:54 PM)Raymond Del Tondo Wrote: The only switches in a CY are the Turbo switch and the write protection switch for page 8, where the RAM-Box OS resides normally.I am seeing only the turbo switch on the side, no page 8 protection switch in view.
I have plugged the ZENROM module in port 2 and tried to erase page 8 with MCED / CLR but it did not worked, so clearly the page 8 is protected somehow.
That smell that I will have to open up the unit.
(12-26-2019 07:54 PM)Raymond Del Tondo Wrote: To override ill-behaved RAM pages you could try with a couple (better quadruple) of 8K ROM modules, like the Petroleum or Math/Stat pacs.CAT 2 does not completely works but the system is still able to find the functions in the pages FAT.
However if the calc hangs after trying to switch banks then the best thing is to wipe out that bank completely, and reinstall using Jürgen's method.
(12-26-2019 07:54 PM)Raymond Del Tondo Wrote: I could also revive your CY easily, but if you have a Clonix, Jürgen's method may be cheaper, since you can do it yourself;-)Since I have all Diego's fantastic modules and in multiple copies, that should not be a problem.
Thank you!
Sylvain
RE: HP-41CY re-initialization ROM - CY-CL - 12-27-2019 07:32 PM
Hello Sylvain
Remove the batterys and take a small pin to unprotect the O/S on page 8 with the switch.
![[Image: wwrbprotect.png]](https://calc.fjk.ch/images/wwrbprotect.png)
Patrik
RE: HP-41CY re-initialization ROM - Sylvain Cote - 12-27-2019 08:04 PM
(12-27-2019 07:32 PM)CY-CL Wrote: Remove the batterys and take a small pin to unprotect the O/S on page 8 with the switch.Wow, you really have to know that there is a switch there.
Page 8 has been erased and CAT 2 is now working as expected, time to leave for another family reunion.
Tomorrow, I have to clear the page 8 of the 2nd bank, carefully read Jürgen's instructions and then reinstall -RAMBOX 64a & -RAMBOX 64b ROM's.
Thank you!
Sylvain
RE: HP-41CY re-initialization ROM - Sylvain Cote - 12-28-2019 04:37 PM
I was able to successfully reinitialize my 41CY this morning.
Jürgen's instructions are clear and very easy to follow, his HP-41CY Technical Information gives a great understanding on how the bank switching works on the 41CY, which I didn’t completely understood by reading the Google translation of the German owners manual.
I will order another Clonix-D module from Diego that I will setup with Jürgen's configuration then add it as the initialization module to the 41CY kit.
It also allowed me to discover his HP-41 MCODE Example Project on OSX project, which I was not aware and which I will try in the next few days.
Thank you Jürgen !
Sylvain
RE: HP-41CY re-initialization ROM - Jurgen Keller - 06-23-2024 06:43 AM
(12-28-2019 04:37 PM)Sylvain Cote Wrote: I was able to successfully reinitialize my 41CY this morning.
Jürgen's instructions are clear and very easy to follow, his HP-41CY Technical Information gives a great understanding on how the bank switching works on the 41CY, which I didn’t completely understood by reading the Google translation of the German owners manual.
I will order another Clonix-D module from Diego that I will setup with Jürgen's configuration then add it as the initialization module to the 41CY kit.
It also allowed me to discover his HP-41 MCODE Example Project on OSX project, which I was not aware and which I will try in the next few days.
Thank you Jürgen !
Sylvain
Just stumbled across this thread today morning. I completely missed that!
I'm happy to hear that the RB2INI procedure helped to re-install the 41CY O/S.
Today, we have the 41CL (so powerful that I will probably never be able to fully explore) but back then, the 41CY was a real gem and is still a lot of fun today. Enjoy it!