HP-41CX w/ XF-Module - just curious

[Sylvain Cote]

(07-26-2019 04:36 AM)Ángel Martin Wrote:  The BUS search order is dictated by the mainframe MCODE.

A post from the hp-41 master itself

(07-26-2019 04:36 AM)Ángel Martin Wrote:  It always starts at page 5, moving up until page F.

That was what I thought I knew.

(07-26-2019 04:36 AM)Ángel Martin Wrote:  When the CX was released HP added a new page at the END of the search, page #3 - that's why 3 in the CAT 2 is shows the last.

Make sense.

(07-26-2019 04:36 AM)Ángel Martin Wrote:  So when you XEQ EMROOM, the OS finds the XROM #26 first corresponding to the external X-Funct module.
It scans that FAT and notices that the id# in question is not there, so it puts out NONEXISTENT - without continuing the search along the BUS and threfore never reaching page #3 (the "last" one).
The same happens if you plug two different modules with the same XROM id#, and the first one has fewer functions than the second: only functions from the first one are found.

Again, that was what I thought I knew.

Then how do you explain the internal time module at page 5 case:

1. OFF
2. remove all the plug-in modules
3. ON
4. PRGM
5. XEQ "RCLALM" (CX TIME function)
6. OFF
7. insert TIME plug-in module
8. ON
9. PRGM
10. XROM 26,34 (CX TIME function not understood by TIME plug-in module)
    

(07-26-2019 04:36 AM)Ángel Martin Wrote:  It's all in the MCODE ;-)

Yeah, yeah, I tried several months ago to go back into the game but I failed, I simply do not have the free time to do so.

Sylvain