Kaypro help, again...

I'm hoping someone knows about this (Don?)... I got a parts-only Kaypro 4 from John Lawson yesterday, to try to cure the ills of my "nice" 4. However, the two machines are quite different: The one I got from John has the built in modem, a serial port, and both paralell and serial printer ports; my original one only has a paralell printer port and a serial port. Also, my old one has 2 eproms on the board, one labeled 81-146 in socket U43, and one with a label "Specialty Sys / STROKE.232 / Rev:1.5 08/84" in socket U47. Don Maslin hadn't heard of this configuration before, so I'm assuming that it's some kind of custom design. The one I got from John only has one eprom, labeled 81-292. The new machine also has a 3v battery on the mainboard. The drives are different too; the old machine has 2 full-height drives while the one from John has 1/2 height drives. Part number of my old unit (from the back of the case) is 81-004 and the part number of the one from John is 81-015. Now, I happen to like the nifty one with the build in modem better. But the video is fried (I said distorted yesterday, but there's nothing legible on the screen) - there's only a little "noise" in the center of the screen and an extremely high-pitched whine/screech coming from the general areal of the video P/S. So what I did, handling everything with [rubber] kid gloves, was swap the CRT and boards, while leaving everything connected in the process. And I got...nothing at all on the screen! I plugged the old mainboard in to the new powersupply and connected it to the video and viola - perfect! So, what gives? I noticed that some of the crystal frequencies are different between the boards - is this what's causing it? Is there something simple I can adjust to get the new machine to work with my original CRT components? Also, any history/explanation about the differences in the two machines would be much appreciated. Aaron