If it's a 10/83, then the 50-pin ribbon cable going to the HD interface (mounted next to the monitor on the HD chassis) is near the center of the board. If it is a K10/84, then the floppy, 50-pin HD interface, and power are all in a row on the right-edge (looking onto the motherboard from the front, monitor facing you). This is actually the exact same motherboard as the K4/84, except the K4/84 (at least mine) has the modem and RTC clock hardware onboard. A 10/83 motherboard is I think an 81-180 (front right corner silk-screened), and my K10/84 has no marking, just a silk-screened "81-" but nothing filled in after.
The other quick way to tell, is if the RAM is soldered, just below the 81-302 EPROM front & center of mainboard, it's an '83.
If the RAM is socketed, front left corner of mainboard, it's an '84.
Right now, unless you have an EARLY Kaypro 10, which will *NOT* have an 81-302 ROM, your only choice is the TurboROM V3.4. If you have a K10/83, you will need to do a minor hack to get a 2764 EPROM in there:
1. Follow the directions for prepping TurboROM-ready boot media
2. Burn the TurboROM V3.4 onto a 2764 (let meknow if you can't find it.)
3. Tie pins 26,27,28 with a piece of wire, wrapping around the front of the EPROM, and also tieing in pin 1. I just get a piece of wire form a multi-conductor copper wire, and solder it onto pins 1,26,27,28.
4. Insert the EPROM into the socket with pins 1,2,27,28 sticking out.
5. use a mini-grabber, or solder a wire, from pin 2 of the EPROM, to pin 2 of the Z80 CPU
Done. If you properly prepped the software, you can now boot, and prep the hard disk for TurboROM (AdvFmt.com)
If you need the TurboROM utilities, let me know
T