HP-41CY re-initialization ROM

[Sylvain Cote]

(12-26-2019 07:54 PM)Raymond Del Tondo Wrote:  

(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.

Bummer

(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.
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.

CAT 2 does not completely works but the system is still able to find the functions in the pages FAT.

(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