For the Printronix P-300, the DEC line printer driver
should be modified to pass "177 codes by the following ZAP:

SET /UIC=[1,54]
ASN LB:=SY:
RUN $ZAP
ZAP> lpdrv.tsk
_2:120656/
2:120656 / 1735
_240
_X
>

	The code is as follows:

2:120652/	122702	CMPB	#177,R2			; check for delete
2:120654/	000177
2:120656/	001735	BEQ	50$			; ignore deletes
2:120660/	005723	TST	(R3)+			; etc, etc

	The BEQ instruction should be changed to a NOP instruction,
so all bytes passed should be printed.

	Also, the buffer size for the printer should be upped, so the
last bytes will not be rejected (which is usually the plot command).

	SET /BUF=LP0:134.