HP 5961-0509 PR, RA, RR, RT, and WG, PM1/PM2 forms of PM, Down until a PD command is received

Notes	When LOST mode is entered, the pen is raised and the following
	commands are ignored: AA, AR, AT, CI, CP, EA, ER, EW, LB, PE, PM,
	PR, RA, RR, RT, and WG.
	The commands allowed in LOST mode are: AC, AD, CF, CO, DF, DI,
	DR, DT, DV, ES, FT, IN, IP, IR, IW, LA, LO, LT, PA, PD, PG, PU, PW,
	RF, RO, RP, SA, SB, SC, SD, SI, SL, SM, SP, SR, SS, TD, UL, WU,
	and the PM1/PM2 forms of PM.
	The commands IN, PG, RP, and PA, with in-range parameters, clear
	LOST mode, PD and PU in absolute plotting mode, with in-range
	parameters, also clear LOST mode. When PD clears LOST mode, a
	line is drawn from the last valid current position to the first point in the
	PD parameter sequence. If PA clears LOST mode, the pen will not go
	down until a PD command is received.

17-12An Introduction to HP-GL/2 Vector Graphics EN