How to install eXpanded Matrix System on the calculator, that is missing here:

Requirements :

• calculator with communication port and matrix mode
• cable
• RS232 - Jack 2.5 mm interface (or other CASIO<->PC interface)
• Software allowing you to send & receive backup of RAM in .cas or .cat format

How to do it:

1. Reset your calculator
2. Send backup to PC and save it as backup1
3. Create matrix A with the dimension 1x1
4. Send backup to PC and save it as backup2
5. Skip to 9. if you have backups in .cat format
6. Compare the both backups - somewhere in the beginning of the file should be difference - backup1 should contain bytes 00 00 where backup2 contains 01 01. Rewrite these bytes (in backup1.cas) to FF FF (use hex editor, for example Volkov commander build-in editor)
7. Recompute the checksum - add 2 (modulo 256) to the last byte of  backup1.cas
8. Skip to 10.
9. Compare the both backups - somewhere in the beginning of the file should be difference - backup1 should contain string " 00 00 " where backup2 contains " 01 01 " . Rewrite this string (in backup1.cat) to" FF FF "(use notepad or other text editor without formatting, only fucked lemming uses MS-Word)
10. Rename backup1 to XMS and send it to your calculator, if happens error somewhere (receive error or matrix A has another size) try it once more. If you cannot do it successfully after a few tries, contact me, but it's possible, that this heuristic method is not applyable in your case.

I tested the .cas version on my cfx 9850 G and the .cat version on cfx 9960 G.