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/COPYRIGHT BY DIGITAL EQUIPMENT CORPORATION 1969 /BASIC CHARACTER GENERATOR /WRITTEN BY MURRAY RUBEN AS PART OF THE KV8/I SOFTWARE. LOCATE=1000 *LOCATE /NOTE: THIS MAIN PROGRAM BEGINS AT 1000 WHICH IS ONLY /AN ARBITRARY NUMBER. ROUTINE IS 332 DECIMAL LOCATIONS LONG. DSPY, 0 /CALL WITH ASCII CHAR IN ACCUMULATOR JMS I SRCHI /IS IT A SEARCH CHARACTER? TAD I SAVE2 /CHECK FOR CONTROL CHAR TAD M240 SPA CLA JMP I DSPY /IGNORE CONTROL CHAR (NO ECHO) TAD I SAVE2 JMS OUTCHM /OUTPUT TO DISPLAY DSPYI, JMP I DSPY /EXIT WITH AC=0 /THE FOLLOWING IS A "SHORT" DATA AREA: M240, -240 SAVE2, SAVE1 /ANOTHER TEMPORARY STORAGE AREA. SRCHI, SEARCH M7, -7 M14, -14 TOP, 506 /TOPMOST LINE OF THE SCREEN. /ROUTINE -RESET- ACCOMPLISHES THE "VERTAB" FUNCTION (CTRL/K). RESET, TAD TOP /ERASE SCREEN, RESET INTGEGRATORS AND CPR TO TOP LEFT 6066 /EXECUTE DCA Y0 /SET Y TO TOP CR, TAD Y0 TAD M14 DCA Y0 TAD MARGIN XCUTE, DCA X0 TAD M240 JMP DSPYI-1 /SET INTEGRATORS TO "MARGIN". SYNC, TAD M7 /"SYNCHRONIZE" A STABLIZING FUNCTION . TAD X0 JMP XCUTE
/VARIABLES USED BY CHARACTER GENERATOR X0, -400 /X CHARACTER POSITION REGISTER Y0, 512 /Y CHARACTER POSITION REGISTER A, 0 /CONTROL WORD B, 0 /MASK WORD C, 0 /MASK POINTER H, 0 /HALFWORD SWITCH /CONSTANTS C7, 7 C77, 77 CEX, 400 SAR1, SAR MASKS, MASK0-1 /THIS IS THE ROUTINE WHICH DEALS WITH THE "MASK" AND /"DISPATCH" CONTROL WORDS FOR THE ACTUAL DETERMINATION /AND EXECUTION OF THE APPROPRIATE VECTOR STROKES TO /BE DISPLAYED ON THE SCOPE..... OUTCHM, 0 /DISPLAY CHARCTER. ENTER WITH ASCII 240-337 AND C77 /MASK TO 6 BITS CLL RAL /*2 TAD SAR1 /ADD DISPATCH DCA A TAD I A /THIS IS MASK WORD AND C7 /MASK OFF MASK BITS CLL RAL /*2 DCA B TAD B CLL RAL /*4 TAD B /*6 NOW TAD MASKS /6 TIMES MASK + MASK HEAD POINTER DCA C /PTR FOR MASK ADDRESSES TAD I A CLL RAR DCA B /SETS INTENSIFY BLANKING BITS, FIRST ALWAYS BLANKED ISZ A TAD I A DCA A /RETRIEVE CONTROL WORD DCA H /SETS LEFT HALF TAD X0 TAD C7 DCA X0 /CHAR ADVANCE
VA, TAD H CIA DCA H /RESET HALFWORD SWITCH ISZ H ISZ C /ADVANCE PTR ON ZERO H TAD A SNA /TEST NEXT CONTROL BIT JMP I OUTCHM /ZERO MEANS ALL VECTORS WERE EXECUTED, SO EXIT CLL RAL DCA A /NEXT CONTROL BIT IN LINK MARGIN, SNL /THIS IS THE Y0 "MARGIN" POINTER IN 2'S COMP.. JMP VA /NOT AN EXECUTION TAD C6064 /INITIALIZE VOUT DCA VSTATE TAD H /0 IF RIGHT HALF, 1 IF LEFT HALF CLL RAR /INTO LINK TAD I C /GET MASK ADDRESS SNL JMP .+4 /R.H. CLL RTR RTR RTR /L.H. DCA I SAVE2 TAD I SAVE2 RTR RAR AND C7 TAD X0 /ADD X MASK TO CPR JMS VOUT /LOAD X ABSOLUTE TAD I SAVE2 AND C7 TAD Y0 /ADD Y MASK TO CPR JMS VOUT /LOAD Y ABSOLUTE TAD B CLL RAL DCA B /RETRIEVE NEXT BLANKING BIT INTO LINK RAL /AND THEN INTO BIT 11 TAD CEX /EXECUTE ABSOLUTE (VISIBLE) VECTOR JMS VOUT JMP VA /BACK FOR MORE VECTORS
/THIS IS THE ROUTINE WHICH ACTUALLY EXECUTES THE /STROKES, POINT DISPLAYS, AND OTHER FUNCTIONS FOR /THE KV8/I CONTROLLER... /DISPLAY OUTPUT AUTO SEQUENCING ROUTINE: VOUT, 0 6071 /WAIT FOR READY FLAG JMP .-1 VSTATE, 6064 /AUTO SEQUENCED INSTRUCTION ISZ VSTATE /SEQUENCE CLA JMP I VOUT C6064, 6064 /INITIALIZED TO LOAD X /THE FOLLOWING ROUTINE EXECUTES THE "TAB" FUNCTION /OF MOVING ALONG THE LINE TO THE NEXT TAB STOP. /TAB STOPS ARE LOCATED EVERY 10 SPACES ALONG /THE LINE FROM THE LEFT MARGIN. TAB, TAD TABHD /ADVANCE X0. DCA A TAB1, ISZ A /TO NEXT TAB STOP. TAD I A SNA /END OF LIST=END OF LINE SO DO CRLF. JMP CR CIA TAD X0 /TEST X0 WITH THE TAB STOP LIST. SMA CLA JMP TAB1 /NOT BIG ENOUGH SO TRY AGAIN. TAD I A /O.K. SET THE TAB AND RESET INTEGRATORS. JMP XCUTE TABHD, TABS-1 /HEAD OF TAB STOP TABLE..
/THE FOLLOWING IS THE ACTUAL "TABS STOP" LIST: TABS=. -252 -144 -36 50 156 264 0 /ZERO ENDS THE LIST.. /THE FOLLOWING "SEARCH" ROUTINE CHECKS THE INPUT /ASCII CODE AGAINST THE "ACTIVE" CONTROL CHARACTERS. SEARCH, 0 /SEARCH ROUTINE. DCA SAVE1 /SAVE THE INPUT ASCII CHARACTER TAD SRCH3 DCA PTR SRCH2, ISZ PTR /FOLLOW ALONG DOWN THE CHARACTER TABLE. TAD I PTR /BRING IN A LIST ELEMENT SNA JMP I SEARCH /END OF TABLE FOUND AND NO MATCH! CIA /COMPLEMENT TO TEST. ISZ PTR TAD SAVE1 /NOW TEST AGAINST THE "CHAR". SZA CLA JMP SRCH2 /NO MATCH FOUND SO TRY AGAIN! TAD I PTR /"MATCH FOUND" !! DCA SEARCH /DO DOUBLE INDIRECT JUMP JMP I SEARCH /FROM DLIST POINTER. /CONSTANTS FOR THE ABOVE SAVE1, 0 /TEMP STORAGE AREA. SRCH3, DLIST-1 /BEGINNING OF THE CONTROL CHAR. TEST LIST.
/THE FOLLOWING PARTS ARE THE CHARACTER TABLES FOR THE CHARACTER /GENERATOR . /CHARACTER MASK COORDINATES MASK0, 0301 /D,J,5,&,%,] 2143 4145 2705 0747 0301 MASK1, 0701 /L,U,V,W,X,Y,I,T,N,M,0,1,(,),] 0706 2447 2724 2141 0147 MASK2, 0141 /2,S,4,9,7,Z,$,/,\,<,> 0747 4404 0747 0141 2127 MASK3, 0424 /A,C,E,F,G,H,K,0,Q,R,P,3,6,8,L,B 3444 4147 0701 4144 2404 MASK4, 2622 /^,B.A.,-,+,* 4305 4503 0426 4404 PTR, 0 /TEMP POINTER CELL USED IN "SEARCH" ROUTINE. MASK5, 4525 /@,#,= 0503 2343 4721 2707 0141 MASK6, 0627 /",',;,:,?,!,,, 2525 4524 2323 1121 2147
SAR=. /CHARACTER DISPATCH TABLE 7745 /@ 6347 5603 /A 4760 7703 /B 2175 7003 /C 0170 7700 /D 3551 5603 /E 5170 5403 /F 5160 7603 /G 0176 5203 /H 4760 5201 /I 1156 7000 /J 5404 6503 /K 6172 6003 /L 0070 7401 /M 3304 7001 /N 3005 7403 /O 0370 7403 /P 4560 7603 /Q 2370 7503 /R 4572 7602 /S 6360 5001 /T 1150 7001 /U 6005 6001 /V 4011 7401 /W 6205 5001 /X 1007 6401 /Y 1330
7002 /Z 0074 7001 /[ 0154 4002 /\ 0044 7000 /] 3050 5404 /^ 6070 6404 /B.A. 2074 0000 /SP 7000 /EXECUTE 3 "INVISIBLE" VECTOR STROKES. 5006 /! 2046 5006 /" 3201 5245 /# 5572 7642 /$ 6363 6740 /% 1675 6760 /& 3637 4006 /' 3000 6001 /( 0124 6001 /) 1202 5204 /* 7700 5004 /+ 6014 4006 /, 0030 4004 /- 0014 4006 /. 0060 4002 // 4400 7601 /0 3107 6401 /1 0456 7602 /2 1714
5503 /3 4770 6402 /4 0364 7600 /5 3434 7603 /6 0175 6002 /7 0070 5703 /8 4770 7402 /9 0364 5006 /: 1460 5006 /; 1430 6002 /< 2120 5005 /= 5500 6002 /> 4240 7506 /? 6346 /THIS IS THE LAST OF THE CHARACTER DISPATCH TABLE..... DLIST=. /TABLE OF ACTIVE CONTROL CHARACTERS. 215 CR /CARRIAGE RETURN 213 RESET /VERTAB FUNCTION OF ERASE AND RESET INTEGRATORS. 377 DSPYI /RUB OUT (IGNORED) 375 DSPYI /ALT MODE KEY (IGNORED) 211 TAB /HT 237 SYNC /SYNC (CTRL/SHIFT/O) FUNCTION TO STABLIZE. 0 /ZERO ENDS THE LIST.... /IT ALSO FINISHES THE CHARACTER GENERATOR PROGRAM..... END=. $