HP-41CX w/ XF-Module - just curious
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07-26-2019, 04:36 AM
Post: #17
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RE: HP-41CX w/ XF-Module - just curious
The BUS search order is dictated by the mainframe MCODE. It always starts at page 5, moving up until page F. 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.
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. It's all in the MCODE ;-) Cheers, ÁM |
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