DigiBoard - xon/xoff out to lunch?

[Sysop]

Greetings - 
I have a customer running SCO Xenix 2.3.3, 2 (count 'em, 2) DigiBoard
8i's, a host of terminals, and 2 Okidata 2410 serial printers.

The problem?  Well, for about a week, I had the two Oki's set for 
xon/xoff handshaking, and things worked peachy.  19200 baud, full bore,
running 200+ page reports or more.

Then, it quit.  Just plain stopped.  I can send a job to the printer,
ala: lp -dOkidata3 Test, and it'll print a page before overflowing the
buffer.

We did not change *ANYTHING* - no mkdev lp, (the Digiboard suppled
interface scripts are still there), no new kernel, no changing dippy 
twitches on the printers.  

SCO Xenix 2.3.3
Digiboard driver v4.3 (or 4.2 - can't remember)
Joe '386/33 from Austin computers w/16meg RAM, 330meg ESDI.

Technician panic: pulse halted.

Dave Shevett - shevett at mccc.EDU  <or>  shevett at dworkin.amber.mccc.edu