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From: fridman@aa.cpsc.ucalgary.ca (Robert Fridman)
Newsgroups: comp.sys.apollo
Subject: Beware Sr10.3
Message-ID: <1991Mar7.221511.28836@cpsc.ucalgary.ca>
Date: 7 Mar 91 22:15:11 GMT
Organization: U. of Calgary Computer Science
Lines: 34
Nntp-Posting-Host: aa


Ian French writes:

	2) sr10.3 and lpd do not mix. Our printers require full 
	XON/XOFF so they can tell the apollo when their buffer is full.
	So they need to have -insync   (tctl command) BUT each time
	a file is sent to any printer on any sio line insync is reset
	to FALSE thus some pages become lost...
	Question: Does anyone out there use lpd and have printers 
		directly connected to apollo sio lines?

I'm running into the same problem.  
My setup:
	10.3, DN4500, apple laserwriter

I'm using strictly BSD printing with Adobe TransCript.  When printing small
files, all is well.  But as soon as a larger file is spooled, I get the
error %%[ ioerr ...]%% from the printer in the error file in the 
/usr/spool/lpd/<printer> directory.

This error means that the buffer has been overrun.  After hooking up a
serial analizer, it was confirmed that the printer was sending ^S but
the apollo was ignoring it.

The stty command has a tandem flag which, according to the man page is supposed
to work XON/XOFF but is doesn't.  

Using tctl -insync works in setting XON/XOFF, but where are you going to put
this command?  (I tried putting /com/tctl ... into the psif script but it
has no effect.)

Either stty tandem is broken or I'm misinterpreting it!!!!!!!!

	RF.