--- /dev/null
+/2 ROM-TD8E HANDLER
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+/COPYRIGHT (C) 1974,1975 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 ROMFLD=70
+ VERSION="A&77
+/THESE ARE ASSEMBLY REFERENCES TO LOCATIONS IN THE ROM:
+
+ RGO=7405
+ F2SET=7552
+/ TD8E MNEMONICS:
+ SDSS=6771
+ SDST=6772
+ SDSQ=6773
+ SDLC=6774
+ SDLD=6775
+ SDRC=6776
+ SDRD=6777
+ *0
+
+ -3
+ DEVICE ROM;DEVICE SYS;4211;2007;0;1341
+ DEVICE ROM;DEVICE DTA0;4211;1007;0;1341
+ DEVICE ROM;DEVICE DTA1;4211;SDTA1&177+1000;0;1341
+\f STARTB-ROMCT-1
+
+ NOPUNCH
+ *7360 /ROOM FOR DECTAPE HEADER WORDS
+ ENPUNCH
+
+STARTB, ZBLOCK 20
+ CDF 0 /BOOTSTRAP TO MOVE FIELD 1
+ TAD I ROM1 /CODE UP TO FIELD 1
+ CDF 10
+ DCA I ROM2
+ ISZ ROM1
+ NOP
+ ISZ ROM2
+ NOP
+ ISZ ROMCT
+ JMP 7400
+ CIF CDF 0 /DONE
+ SDLC /STOP THE TAPE
+ JMP I .+1
+ 7605 /START HER UP
+ROM1, 7427 /FIELD 1 CODE GETS LOADED HERE
+ROM2, 7647 /AND GOES UP HERE
+ROMCT, -130
+\f *200
+
+ NOPUNCH
+ *7600
+ ENPUNCH
+
+ ZBLOCK 7
+SHNDLR, VERSION /UNIT 0 ENTRY
+ CLA CLL
+ JMP SHND2
+S70, 70
+S6201, 6201
+SDTA1, VERSION /UNIT 1 ENTRY POINT
+ CLA CLL CML
+ TAD SDTA1 /GET ARGS AT SHNDLR
+ DCA SHNDLR
+SHND2, RAR /UNIT BIT IS IN LINC
+ DCA SUNIT
+ RDF
+ TAD S6203 /SETUP RETURN FIELD
+ DCA EFLD
+ TAD I SHNDLR
+ SDLD /STORE FUNCTION WORD IN DATA REG.
+ AND S70 /SDLD DOESN'T CLEAR AC
+ TAD S6201 /ISOLATE FIELD OF XFER
+ DCA TFLD
+ TAD TFLD
+ DCA TFLD2
+ ISZ SHNDLR
+ TAD I SHNDLR /BUFFER ADDRESS
+ DCA BPTR
+ ISZ SHNDLR
+ TAD I SHNDLR /PS/8 RECORD #
+ CLL RAL /TIMES 2 FOR ABSOLUTE BLOCK
+ DCA BLOCK
+ ISZ SHNDLR
+ CDF 0
+ CIF ROMFLD /ROM IS IN FIELD 7
+ JMP I XF2SET /INITIALIZE.
+\fGET, 0
+TFLD, HLT /ROUTINE TO LOAD DATA FROM BUFFER
+ TAD I XPTR
+ CIF ROMFLD
+ JMP I GET
+
+PUT, 0 /PUT DATA INTO BUFFER
+TFLD2, HLT
+ DCA I XPTR
+ CIF ROMFLD
+ JMP I PUT
+
+ERROR, CLA CLL /FORCE TURNAROUND AT RGO
+ CIF ROMFLD
+ ISZ TRYCNT /TRIED 3 TIMES?
+ JMP I XRGO
+S6203, CIF CDF 0
+ JMP SEREX /YES..FATAL EXIT
+
+XRGO, RGO
+XF2SET, F2SET
+\f/EQUIVALENCES FOR HANDLER
+
+ EQUTMP=7750
+ BPTR=7751
+ XPGCT=7752
+ XPTR=7753
+ XWCNT=7754
+ WRQ=7724
+WRQUAD, 0 /WRITE A 12 BIT TAPE WORD
+ CIF ROMFLD
+ JMP WRQ
+CIFR, CIF ROMFLD
+ JMP I WRQUAD
+
+RDQUAD, 0 /READ A 12 BIT DATA WORD
+ SDSQ
+ JMP .-1
+ SDRD
+ CIF ROMFLD
+ JMP I RDQUAD
+
+EQUFUN, 0 /EQUIVALENCE CHECKSUM
+ CMA
+ DCA EQUTMP
+ TAD EQUTMP
+ AND SCKSUM
+ CIA
+ CLL RAL
+ TAD EQUTMP
+ TAD SCKSUM
+ DCA SCKSUM
+ TAD EQUTMP
+ CLL CMA
+ CIF ROMFLD
+ JMP I EQUFUN
+
+SEXIT, ISZ SHNDLR /NORMAL EXIT
+SEREX, TAD SUNIT /STOP THE DRIVE
+ SDLC
+ CLA CML RAR /EXIT CONDITION IN BIT 0
+EFLD, HLT
+ JMP I SHNDLR
+
+TRYCNT, 0
+SXUNIT, 0
+SXFUN, 0
+SCKSUM, 0
+BLOCK, 0
+SUNIT, 0
+ $
+\f
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