"ttya" for serial console.
The connector is "HIROSE QM10-14R(L)-PR".
But it is an acquisition difficulty now.
Solder, attach a cable to a logic board directly.

http://www.kk.iij4u.or.jp/~taokamur/luna68k/serial.jpg
(pin asignment)

From: Landon Rodgers <landonr1@mac.com>
Subject: Luna serial connectors
Date: Tue, 19 Mar 2002 18:44:54 -0500

> What serial connectors do a LUNA use?  Where can I get them?