--- /dev/null
+/3 CARD READER FOR BUILD
+/
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+/
+/COPYRIGHT (C) 1974 BY DIGITAL EQUIPMENT CORPORATION
+/
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+/
+/
+/
+/THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE
+/AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
+/CORPORATION. DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY
+/FOR ANY ERRORS THAT MAY APPEAR IN THIS DOCUMENT.
+/
+/THE SOFTWARE DESCRIBED IN THIS DOCUMENT IS FURNISHED TO THE PURCHASER
+/UNDER A LICENSE FOR USE ON A SINGLE COMPUTER SYSTEM AND CAN BE COPIED
+/(WITH INCLUSION OF DIGITAL'S COPYRIGHT NOTICE) ONLY FOR USE IN SUCH
+/SYSTEM, EXCEPT AS MAY OTHERWISE BE PROVIDED IN WRITING BY DIGITAL.
+/
+/DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY FOR THE USE
+/OR RELIABILITY OF ITS SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY
+/DIGITAL.
+/
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+/
+\f *0
+ -1
+DEVICE CR8E;DEVICE CDR;2030;4000;ZBLOCK 2
+
+ CDRVERSION="C&77
+
+/V3 CHANGES:
+
+/1. VERSION # IS NOW 1
+/2. FIXED BUG FOR CARDS WITH ODD NUMBER OF COLUMNS
+/3. CARD DONE FLAG IS CLEARED AT END
+
+ *200
+
+RCSF=6631
+RCRA=6632
+RCSP=6671
+RCSE=6672
+RCRD=6674
+
+CDR, CDRVERSION /ENTRY POINT RELATIVE ZERO
+CDR770, 7700 /"SMA CLA" CLEARS THE AC
+CDRTMP, 0 /LESS THAN 400 - PROTECTS THE "SMA CLA"
+ JMP CDRSET /INITIALIZATION - BECOMES "RDF"
+ TAD CDRCIF /FORM "CIF CDF N" TO CALLING FIELDS
+ DCA CDRXIT /SAVE CALLING FIELDS
+ TAD CDRCCF-1
+ DCA CDRXIT-1 /RESTORE THE "ISZ CDR"
+ TAD I CDR /GET FUNCTION WORD
+ AND CDR070 /GET BUFFER FIELD BITS
+ TAD CDRCCF /MAKE A "CDF N"
+ DCA CDBCDF /SAVE IT IN THE GET CHAR LOOP
+ TAD I CDR /GET FUNCTION WORD AGAIN
+ ISZ CDR
+ SPA /IS IT A WRITE FUNCTION?
+ JMP CDRERR /YES - HARD ERROR
+ AND CDR770 /GET COUNT BITS
+ CIA
+ DCA CDRWC /SAVE WORD COUNT (DIVIDED BY 2)
+ TAD I CDR /GET BUFFER ADDRESS
+ DCA CDRCA /AND SAVE IT
+ ISZ CDR /THE BLOCK NUMBER IS IGNORED
+CDRCCF, CDF /WE ARE IN FIELD 0
+ DCA I CDRIN2 /RESET ^Z FLAG TO ZERO
+CDRLP, JMS I CDRIN4 /GET A CHARACTER
+ DCA CDRTM1 /DATA FIELD STILL ZERO ON RETURN!
+ JMS I CDRIN4 /GET NEXT CHARACTER
+ DCA CDRTMP /AND SAVE IT
+ JMS I CDRIN4 /GET NEXT CHARACTER
+ RTL
+ RTL /GET THE FIRST FOUR BITS OF IT
+ DCA CDRTM2 /SAVE THE REST FOR LATER
+ TAD CDRTM2
+ AND CDR740 /ONLY 4 BITS
+ TAD CDRTM1 /ADD THOSE BITS TO THE 1ST CHAR
+CDBCDF, HLT /CDF TO BUFFER FIELD
+ DCA I CDRCA /STORE 1ST CHARACTER
+ ISZ CDRCA /BUMP POINTER TO BUFFER
+CDR740, 7400 /PROTECT THE ISZ AGAINST SKIPS
+ TAD CDRTM2
+ RTL
+ RTL /NOW GET LOW ORDER 4 BITS
+ AND CDR7400 /AND ONLY 4 BITS
+ TAD CDRTMP /ADD IN THE 2ND CHARACTER
+ DCA I CDRCA /AND STORE THE WORD
+ ISZ CDRCA /BUMP POINTER AGAIN
+CDR070, 70 /PROTECT THE ISZ
+ CDF 0 /CDRGCH NEEDS 0 DF ON ENTRY!
+ ISZ CDRWC /DONE?
+ JMP CDRLP /NO - LOOP
+CDRERR, ISZ CDR /HERE WITH NEGATIVE AC ON WRITE - FATAL ERROR
+ ISZ CDR /IF ^Z THIS IS ZEROED
+CDRXIT, HLT /RESTORE CALLING FIELDS
+ JMP I CDR /EXIT
+
+CDRCA, 0 /BUFFER POINTER
+CDRWC, 0 /WORD COUNT DIVIDED BY 2
+CDRTM1, 0
+CDRTM2, 0 /SPLIT WORD TEMPORARY
+CDRCIF, CIF CDF 0 /TO FORM EXIT WORD
+
+CDRIN2, CDRJMP-CDRLOC /CORRECTED AT INITIALIZATION TIME
+CDRIN4, CDRGCH-CDRLOC
+
+ 0 /** FREE LOCATIONS - COME AND GET 'EM !
+ 0
+ IFNZRO .-277 <RESORC,_ERROR_> /BUT THERE'S A CATCH
+CDRTBL, 0021;2223;2425;2627;3031;3203;4007;3502
+ 2017;6364;6566;6770;7172;7514;0577;3637
+ 1552;5354;5556;5760;6162;0104;1211;3374
+ 0641;4243;4445;4647;5051;7316;3410;1376
+
+/DO NOT INSERT ANYTHING BETWEEN "CDRTBL" AND "CDRBUF"!!
+
+CDRBUF=. /CARD BUFFER
+
+CDRSET, RDF /INITIALIZATION CODE
+ TAD CDRCCF
+ DCA CDRSE1 /SAVE CALLING FIELDS
+ CDF /WE ARE IN FIELD 0
+ JMS . /FIND OUT OUR LOCATION
+CDRLOC, TAD CDRSE2 /ADDRESS TO MODIFY
+ TAD CDRLOC-1 /CORRECT IT
+ DCA CDRSE3 /SAVE IT
+ TAD I CDRSE3 /GET DATA TO MODIFY
+ TAD CDRLOC-1 /CORRECT IT
+ DCA I CDRSE3 /AND RESTORE IT
+ ISZ CDRLOC /NEXT ADDRESS
+ ISZ CDRSE4 /MORE?
+ JMP CDRLOC /YES - LOOP
+ TAD CDRSET
+ DCA CDR+3 /SET THE "RDF"
+CDRSE1, HLT /RESTORE CALLING FIELDS
+ JMP CDR+3 /AND BACK TO NORMAL
+
+CDRSE3, 0 /MODIFY POINTER
+CDRSE4, -5 /FIVE LOCATIONS TO MODIFY
+
+CDRSE2, CDRIN2-CDRLOC /LOCATIONS TO MODIFY
+ CDRIN4-CDRLOC
+ CDRIN5-CDRLOC
+ CDRABF-CDRLOC
+ CDRTAD-CDRLOC
+\f*CDRBUF+50 /END OF THE BUFFER
+
+CDRGCH, 0 /GET A CHARACTER ROUTINE - ENTER WITH DF=0
+CDRJMP, 0 /THIS IS "JMP I CDRGCH" AFTER A ^Z
+ ISZ CDRCNT /MORE CHARACTERS IN THE INTERNAL BUFFER?
+ JMP CDRGET /YES - GET ONE
+CDRGE4, ISZ CDRCT2 /GIVE A 215, 212 FOR EVERY CARD
+ JMP CDRCLF /215, 212 ROUTINE
+ CLL CLA CMA RTL
+ DCA CDRCT2 /RESET COUNT TO -3
+CDRGNC, TAD CDRABF
+ DCA CDRPT /SET POINTER TO INTERNAL BUFFER
+CDRGE0, KSF /KEYBORAD FLAG UP?
+ JMP CDRGE7 /NO - TRY TO READ A CARD
+ TAD CDR760 /FORCE THE PARITY BIT ON
+ KRS /READ STATIC FROM KEYBOARD
+ TAD CDR175 /IS IT ^C?
+ SNA
+ JMP I CDR760 /YES - TO MONITOR VIA 07600
+ TAD CDRM27 /IS IT ^Z?
+ SZA CLA
+ JMP CDRGE7 /NO - GET A CARD
+ KCC /KILL FLAG
+CDRGEZ, CLA CMA
+ DCA CDRCNT /RESET COUNTS TO SKIP
+ CLA CMA
+ DCA CDRCT2
+ TAD CDRMOD
+ DCA CDRJMP /SET TO GIVE 0'S
+ DCA I CDRIN5 /AND A SOFT ERROR
+ TAD CDR232 /^Z
+ JMP I CDRGCH /EXIT
+
+CDRGE7, RCSE /SELECT A CARD
+ JMP CDRGE0 /NO GO - TRY AGAIN
+ DCA CDRSW /SET PACKING SWITCH
+CDRGCL, DCA CDRTIM /INITIALIZE TIMEOUT COUNTER
+CDRGE1, RCSP /CARD DONE?
+ JMP CDRGE2 /NO - TRY FOR DATA READY
+ RCRD /CLEAR CARD DONE FLAG
+CDRGE3, TAD I CDRPT /GET LAST TWO CHARACTERS
+ SZA /BOTH SPACES?
+ JMP CDRGE5 /NO
+ CLA CMA
+ TAD CDRPT
+ DCA CDRPT /BACK UP POINTER ONE
+ ISZ CDRCNT
+ ISZ CDRCNT /AND TAKE COUNT DOWN BY 2
+ JMP CDRGE3 /TEST AGAIN OR...
+ JMP CDRGE4 /IF COUNT IS ZERO THE A BLANK CARD
+
+CDRGE5, AND CDR077 /IS RIGHT HAND CHARACTER A SPACE?
+ SNA CLA
+ ISZ CDRCNT /YES A SPACE - REDUCE COUNT
+ TAD I CDRPT /GET LAST NON-SPACE
+ TAD CDR077 /THIS FORMS 7777 IFF WORD CONTAINS "_"
+ AND CDRCNT /THIS MAINTAINS 7777 IFF CDRCNT IS -1
+ CMA
+ SNA CLA /ARE BOTH CONDITIONS TRUE?
+ JMP CDRGEZ /YES - MUST BE END OF FILE
+CDRGE6, TAD CDR077
+ DCA CDRSW /SET OFFSET FROM "CDRTBL"
+CDRGET, ISZ CDRSW /BUMP OFFSET
+ TAD CDRSW /OFFSET INTO AC
+ JMS CDRGE8 /GET A CHARACTER
+ TAD CDR240 /MAKE IT ASCII
+CDRMOD, JMP I CDRGCH
+
+CDRGE8, 0 /GET FROM BUFFER ROUTINE
+ CLL RAR /DIVIDE BY 2 - AND INTO LINK IS INDICATOR
+ TAD CDRTAD /ADDRESS OF "CDRTBL"
+ DCA CDRTM3 /SET POINTER
+ TAD I CDRTM3 /GET WORD
+ SZL /SHIFT?
+ JMP .+4 /NO
+ RTR /YES
+ RTR
+ RTR
+ AND CDR077 /GET 6 BITS
+ JMP I CDRGE8
+
+CDRGE2, RCSF /DATA READY?
+ JMP CDRGEX /NO - TRY FOR TIME OUT
+ RCRA /READ ALPHA
+ JMS CDRGE8 /GET TABLE ENTRY
+ ISZ CDRSW /WHICH SIDE?
+ JMP CDRGE9 /LEFT SIDE
+ TAD I CDRPT
+ DCA I CDRPT /FORM RIGHT SIDE
+ JMP CDRGCL /CONTINUE
+
+CDRGE9, CLL RTL /SHIFT LEFT
+ RTL
+ RTL
+ ISZ CDRPT /BUMP POINTER
+ DCA I CDRPT /STORE LEFT SIDE
+ CLA CLL CMA RAL /-2 V3 FROM SIS BULLETING JAN 73
+ TAD CDRCNT
+ DCA CDRCNT /COUNT THE CHARACTERS
+ CLA CMA
+ JMP CDRGCL-1 /CONTINUE - SET SWITCH
+\fCDRCLF, CLA CMA
+ DCA CDRCNT /SET MAIN COUNT TO SKIP
+ TAD CDRCT2
+ CLL CMA RTL /ALL THIS DOES IS...
+ TAD CDRCT2 /MAKE A 2 OR -1
+ TAD CDR213 /SO THIS MAKES A 215 OR 212
+ JMP I CDRGCH
+
+CDRGEX, /TEST TIME OUT - FIRST DELAY USING CONSTANTS
+CDR760, 7600 /MONITOR ADDRESS
+CDR077, 77 /SIX BIT MASK
+CDRM77, -7700 /-"_ "
+CDR175, 175
+CDR240, 240 /ASCII SPACE
+CDR213, 213 /215, 212 CORRECTION FACTOR
+CDR232, 232 /ASCII ^Z
+ ISZ CDRTIM /THIS LOOP TAKES AT LEAST 100MS ON AN 8/E
+ JMP CDRGE1
+ DCA CDRCNT /CLEAR COUNT IN CASE PARTIAL CARD READ (E.G. JAM)
+ JMP CDRGNC /TIMED OUT - RESTART CARD
+
+CDRTM3,
+CDRTIM, 0 /TIMEOUT COUNTER
+CDRM27, -27 /-27-3=-32 ^Z TEST
+CDRCNT, -1 /MAIN COUNT
+CDRCT2, -1 /215, 212 COUNT
+CDRPT, 0 /BUFFER POINTER
+CDRSW, 0 /SWITCH
+
+CDRABF, CDRBUF-1-CDRLOC /MODIFIED LOCATIONS
+CDRTAD, CDRTBL-CDRLOC
+CDRIN5, CDRXIT-1-CDRLOC
+ $
+\f
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