When you do the CPU upgrade, be sure to take the opportunity to replace the battery. 'cans have problems with battery failure and replacing the battery is a PITA. Do it while you have the machine apart. Note that this machine requires a special BR2032 battery, so get that and have it on hand before upgrading the machine.
Speaking of Trashcan problems with failed batteries, mine has a dead battery and of course does not keep time when shut down. That does not bother me. But now it does not like keyboards. Specifically, the <<, >II, and >> playback keys are unresponsive. Other keys work. There is nothing wrong with multiple keyboards, all of which work fine with other machines. So I may have to take it apart and install the new battery I got for it. Has anyone else found that their keyboards attached to MP 6,1 machines act this way when the batteries fail?