Re: HP41 ROM Modules Message #2 Posted by Raymond Hellstern on 20 Sept 2001, 9:14 a.m., in response to message #1 by Erik van der Meulen
Hello,
your X-Memory module is just that: memory (238 registers;-)
To access the x-memory space, you need some mamnagement functions which are in another module called X-Functions.
This module has 124 RAM registers, too.
Your 41CX has the X-Functions module and it's additional 124 registers built-in.
Your 41CV doesn't. So if you want to use the X-Memory module in your 41CV, you first have to install an X-Functions module.
Some things to notice:
You can use up to 2 X-Memory modules at the same time in the same machine.
If you put one of these into port 1, the other one can't be put into port 3.
If you put one of these into port 2, the other one can't be put into port 4.
Any other combination is allowed.
This restriction is due to address conflict reasons.
For the Advantage Pac:
This one adds some functions to the system, and many matrix functionalities. These matrix functions were taken out of the CCD module where they originate.
So you shouldn't use them both at the same time.
The CCD module has many features, like system and user interface extensions, port and HP-IL catalogues,
the mentioned matrix functions, printing, ....,
and much more.
IMHO the CCD module is the best ROM module ever made for the HP-41 series.
The only module which offers more features is the HEPAX;-)
Hope this helps.
Regards,
Raymond
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