100 
 110 INCON,	.-.				/CONSOLE INPUT ROUTINE
 120 	JMP I	[CONIN]			/GO HANDLE IT THERE
 130 
 140 OUTCON,	.-.				/CONSOLE OUTPUT ROUTINE
 150 	JMP I	[CONOUT]		/GO HANDLE IT THERE
 160 
 170 OUTLPT,	.-.				/LPT: OUTPUT ROUTINE
 180 	JMP I	[LPTOUT]		/GO HANDLER IT THERE
 190 
 200 EMPTPTR,.-.				/BUFFER EMPTYING POINTER
 210 EMPTR,	.-.				/TEMPORARY EMPTYING POINTER
 220 FILLPTR,.-.				/BUFFER FILLING POINTER
 230 LSTATUS,0				/LPT: STATUS
 240 
 250 /	THE FOLLOWING WORDS ARE USED BY THE CONSOLE UTILITY CODE TO DETERMINE THE
 260 /	CHECKSUMMED REGION OF THE OVERLAY. DUE TO RESTRICTIONS OF THE UTILITY,
 270 /	THIS REGION MUST BE LOCATED BETWEEN 0000 AND 2577.
 280 
 290 CHKCNT,	CONOFF+1-ENDROM			/CHECKSUM COUNT
 300 CHKPTR,	CONOFF+1			/CHECKSUM POINTER
 310 
 320 /	THE FOLLOWING ARE LINKAGE POINTERS PROVIDED FOR THE TRAP BLOCK ROUTINES.
 330 
 340 IOTRAP,	JMP I	[TRAPIO&177+TRPAGE]	/GO HANDLE I/O CALLS THERE
 350 ERRTRP,	JMP I	[TRPERR&177+TRPAG2]	/GO HANDLE I/O ERRORS THERE
 360 IOWAIT,	JMP I	[WAITIO&177+TRPAGE]	/GO WAIT FOR I/O TO COMPLETE THERE
 370 	0				/RESERVED FOR ADDITIONAL HANDLER INTERCEPT
 380 
 390 /	THE FOLLOWING WORD IS USED TO INDICATE INITIAL RELOADING OF THE OVERLAY.
 400 /	ANY CLEANUP CAUSED BY RELOADING OF THE OVERLAY IS GOVERNED BY THE
 410 /	VALUE OF THIS WORD. THE TRAP BLOCKS WILL BE RELOADED IF THIS WORD IS -1.
 420 
 430 INITSW,	-1				/FIRST TIME SINCE RELOAD SWITCH
 440 	EJECT
 450 /	THE INTERRUPT ROUTINE EXITS HERE.
 460 
 470 INTRET,	.-.			/WILL BE CIF CDF RETURN FIELD
 480 	JMP I	CONINT		/RETURN TO CALLER
 490 
 500 /	THE CONSOLE TURNOFF ROUTINE EXITS HERE.
 510 
 520 OFFRET,	.-.			/WILL BE CIF CDF RETURN FIELD
 530 	JMP I	CONOFF		/RETURN TO CALLER
 540 
 550 /	THE LPT: ROUTINE EXITS HERE.
 560 
 570 LPTRET,	.-.			/WILL BE CIF CDF RETURN FIELD
 580 	JMP I	OUTLPT		/RETURN TO CALLER
 590 
 600 /	THE INPUT ROUTINE RETURNS HERE.
 610 
 620 INRET,	.-.			/WILL BE CIF CDF RETURN FIELD
 630 	JMP I	INCON		/RETURN TO CALLER
 640 
 650 /	THE OUTPUT ROUTINE RETURNS HERE.
 660 
 670 OUTRET,	.-.			/WILL BE CIF CDF RETURN FIELD
 680 	JMP I	OUTCON		/RETURN TO CALLER
 690 
 700 /	PRINTER BAUD RATE VARIABLE.
 710 
 720 BAUDRAT,IRATE			/HOLDS PRINTER BAUD RATE VALUE
 730 
 740 	ZBLOCK	77-.		/EMPTY SPACE
 750 
 760 ESTATUS,.-.			/ERROR STATUS STORED HERE DURING ERROR RECOVERY
 770 
 780 /	THE FOLLOWING ENTRY IS USED FOR ANY HOUSEKEEPING NEEDED BY
 790 /	THE OVERLAY ROUTINES WHEN THE OVERLAY IS REQUESTED TO SHUT DOWN
 800 /	BY VARIOUS PROGRAMS SUCH AS "BIN" ETC., WHICH CAN'T FUNCTION DURING
 810 /	DMA, ETC. CAUSED BY VARIOUS VERSIONS OF THE OVERLAY.
 820 
 830 CONOFF,	.-.			/CONSOLE OFF ROUTINE
 840 	JMP I	[OFFCON]	/HANDLE IT THERE
 850 
 860 /	THE FOLLOWING IS THE SPECIAL ENTRY POINT FOR THE KEYBOARD MONITOR. IT IS
 870 /	DELIBERATELY PLACED WITHIN THE "ROM" AREA (WHICH STARTED ONE WORD AGO)
 880 /	AS A DELIBERATE MEASURE TO CAUSE RELOAD IN CASE THE OVERLAY IS PARTIALLY
 890 /	CLOBBERED, BUT NOT WITHIN THE "ROM" AREA. SHOULD THE MONITOR INITIALIZATION
 900 /	FAIL TO COMPLETE, THIS LOCATION WILL BE NON-ZERO, THUS FURTHER ATTEMPTS
 910 /	TO REBOOT THE SYSTEM WILL RELOAD THE OVERLAY. THIS ENTRY WILL INITIALIZE
 920 /	THE MONITOR'S CONSOLE ROUTINES TO CALL THE OVERLAY, AND WILL INTERCEPT
 930 /	ALL SYSTEM READ/WRITE I/O ACCORDING TO THE DICTATES OF THE TRAP BLOCKS.
 940 
 950 XIOMON,	0			/KEYBOARD MONITOR INITIALIZATION ENTRY POINT
 960 	JMP I	[MONINIT]	/GO HANDLE IT THERE
 970 	EJECT