HP-41CY re-initialization ROM

[Raymond Del Tondo]

(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;-)