Erik Baigar wrote: The 1602s were widely used in the GLCM/SLCM erector and launch control systems (and in fact required jumping through some flaming hoops of fire for the NAB owing using essentially an unmodified Nova I/O bus with no parity or other error detection). The 1602 was a fundamental component of a weapons system; the 1666B, while a more interesting machine, never had that sort of penetration; most units ended up sitting in labs at the NSWC. What you're observing may be a consequence of that fact. While we're on the topic, does anyone have the pinouts for the console (or is it just straight through?) and power cables? Chris. -- Chris Kennedy chris at mainecoon.com AF6AP http://www.mainecoon.com PGP KeyID 108DAB97 PGP fingerprint: 4E99 10B6 7253 B048 6685 6CBC 55E1 20A3 108D AB97 "Mr. McKittrick, after careful consideration..."