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If you plan to connect an HP LaserJet (II, IIP, III, etc.) you need to make a special cable in order for the NeXT 040 and HP to get the hardware handshaking correct. This is true for whatever version of the OS you are running.
NeXT 68040 to HP LaserJet III Cable (not a Null-modem cable):
You may want to use hardware flow control for reliability (ie /dev/ttyfa).
If you have problems with other printers, check the cable pinouts in the printer's manual against the one recommended in the zs man-page! Refer to Chapter 13 in Network and System Administration.