HP-41CY re-initialization ROM

[PeterP]

(11-04-2019 08:02 PM)Jurgen Keller Wrote:  

(11-04-2019 03:48 PM)PeterP Wrote:  Juergen, that makes total sense for the kick-off of the initialization. My concern was with the pages where you store the OS. My understanding is that you use a CLONIX which has the init module on page 4 and the OS/A on page E and the OS/B on page F.

Assuming this is the case, here is the problem case I was thinking of: Assume you have messed up pages - including junk in polling points - 8, 9, E, F. You can clear of course pages 8 & 9 as they are not masked by a plug-in module (which takes precedence). But how are you clearing the polling points in pages E & F, as they are masked by the CLONIX, aren't they?

Not sure if this question makes sense.

Cheers,

PeterP

You can still write to RAM pages using WROM, even if they are masked by ROM images in the CLONIX. However, jumps to such addresses will end up in ROM code. This is described by Winfried Maschke in this post. I don't exactly understand it (electronics stuff), but I confirmed that it works like that. Does this answer your question?

It sure does!!! thank you!

PeterP