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In article <1714@devvax.JPL.NASA.GOV> dean@devvax.JPL.NASA.GOV (Dean Okamura) writes:
>We have a LaserWriter that cannot print output from the Mac which was
>previously hooked up to a PC running WordPerfect.
>
>As far as I can tell, the "offending command" is:
>
>    25 9600 7 setsccbatch
>
>... The LaserWriter documentation states that the parity values
>range from 0 to 3.

In revisions 2.0 and above of the PostScript interpreter, the
parity value (shown as 7 above) is extended so that adding 4 to
the usual 0-3 value selects hardware flow control (using DTR).
If the 4 is not added, then only software flow control will be
used (XON/XOFF).

To set this right, you need to execute the usual

        serverdict begin 0 exitserver
        statusdict begin
        25 9600 3 setsccbatch
        end

or whatever parity value you prefer. If you are using AppleTalk
to connect the Mac to the LaserWriter then this setting is
irrelevant and your problem is much more likely to be having
both cables connected at once: sorry, but it just won't work!

Incidentally, the information about the parity setting comes
from

        Update for the Apple LaserWriter and
        LaserWriter Plus

        Revision 2

from Adobe Systems. Apple UK (and Apple Belgium) had never
heard of it, so you had probably better contact Adobe directly
if you want a copy.
-- 

William Roberts         ARPA: liam@cs.qmc.ac.uk  (gw: cs.ucl.edu)
Queen Mary College      UUCP: liam@qmc-cs.UUCP
LONDON, UK              Tel:  01-980 4811 ext 3933