Well, that sucks... and I presume you can't just replace the ROM that currently houses the 2.2 with a newer version of the operating system?
Yes AND no. The original eprom was a 512k size (27C512-12) and is a 28 pin chip. Early Central Control Computer boards only had a 28 pin IC socket. Intermediate CCC boards had a 32 pin setup on the board, but only a 28 pin socket installed. Simply unsolder the 28 pin socket and replace it with a 32 pin socket. Later CCC boards already have a 32 pin socket installed.
Starting with software version 3.2 and up, the eprom is a 1mb size 27C010-12 which has 32 pins. The larger capacity chip is required because so much more was added to the software.
So look through the rectangular hole in the CCC board's cover at the eprom chip socket. If it's already a 32 pin socket you can simply swap out software eproms.