🚀 go-pugleaf

I have seen this exact problem on an ImageWrite LQ here that is
directly (as opposed to AppleTalk) connected to a MAC-II.  The
messages is annoying, but so far I have not seen any evidence of
lost data on the print.

I did some poking with a line monitor, and discovered the MAC
asks for a "SELF-ID" from the printer at start AND end of job.
If the end of job response is not back in a very short time
(around 4 seconds) the Mac puts up the message.  The response
always comes, but never until the printer finishes processing
the buffer full of data ahead of the SELF-ID request.  This usually
takes 15 seconds or so if the buffer is nearly full.

The Mac is much more patient if the printer is hooked up to the
"modem port";  it will wait darn near forever for the SELF-ID response
at end of job on the modem port.  If your modem port is free, you might
try moving the printer to that port and selecting it via Chooser.

We don't have MPW, so I don't know what its problem is.  BTW:  The
Self ID request gets a response of the form "LQ<options><CR>".  Options
is a tring of 1 or more ascii characters, which is comes out as
"LQ1<CR>" for an LQ with no options installed.  The "Apple LQ
ImageWriter Reference" (Addison Wesley) discusses this in detail.

Let me know what window you throw yours out of; I may want to use
it myself.