--- /dev/null
+/5 LP08/LS8E/LA180/LV8E HANDLER
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+/COPYRIGHT (C) 1974,1975,1977 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 LPVERSION="C&77
+
+ *0
+
+ -1
+ DEVICE LPSV;DEVICE LPT;1040;LPT&177;ZBLOCK 2
+
+/LPT HANDLER FOR EITHER LP08 OR LS8E LINE PRINTER.
+/HANDLES TABS, PASSES EVERYTHING ELSE ON TO THE HARDWARE.
+
+ LSF=6661 /SKIP ON FLAG
+ LSR=6663 /SKIP ON ERROR
+ LLS=6666 /LOAD LPT BUFFER
+
+ DBST= 6570 /SKIP IF DEMAND SET AND CLEAR IT
+ DBTD= 6574 /LOAD COMPLEMENT OF AC0-11 TO TRANSMIT BUFFER
+ DBSE= 6575 /SET INTERRUPT ENABLE
+ DBCE= 6575 /CLEAR INTERRUPT ENABLE
+
+ LA180=0 /SET TO 1 TO USE LA180
+
+/V3D CHANGES:
+
+/ADDED IN LA180 SUPPORT
+\f *200
+
+LPWDTH, -205 /-(WIDTH+1) [USE -121 FOR 80 COLUMNS]
+LTERMC, 14 /4 FOR LV8
+LVCCNV, -40 /0 IF PRINTER PRINTS LC
+LP7770, 7770
+LP0007, 0007
+LPT, LPVERSION /NORMAL ENTRY POINT
+ CLA STL RAR
+ TAD I LPT / R/W BIT TO LINK L
+ AND LP7700 / I
+ CMA /TREAT 0 PG CNT AS 0 WD CNT N
+ DCA LPTWC /SAVE -(DBLWD COUNT+1) K
+LPT214, RDF /
+ TAD LPTCIF / M
+ DCA LPTXIT /SAVE CIF CDF RETRN FIELD U
+ TAD I LPT / S
+ AND (70 / T
+ TAD (CDF 0 /
+ DCA LPTCDF / N
+ ISZ LPT /PT TO BUFFER O
+ TAD I LPT /GET BUFFER ADDRESS T
+ DCA LPTCA /SAVE BUFFER PTR
+ ISZ LPT /PT TO BLOCK # C
+ TAD I LPT /GET IT H
+ ISZ LPT /POINT TO ERROR RETURN G
+LPTCDF, HLT / !
+ SNL
+ JMP LPTERR /CAN'T READ FROM LPT
+ SNA CLA
+ TAD LPT214 /OUTPUT FORM FEED IF BLOCK 0
+LPTELP, JMS LPTPCH /PRINT 3RD CHAR OF DOUBLEWORD
+ ISZ LPTWC
+ JMP LPTLP /GET 3 MORE CHARS
+ SKP
+LPTCTZ, TAD LTERMC
+ JMS LPTPCH /OUTPUT FORM FEED IF ^Z SEEN (EOT OF LV8)
+ ISZ LPT /BUMP TO NORMAL RETURN
+LPTXIT, HLT /RESTORE FIELDS
+ JMP I LPT /EXIT
+\f/UNPACKING LOOP - USES A SHIFT REGISTER METHOD TO GET THE
+/THIRD CHARACTER IN EACH DOUBLEWORD.
+
+LPTLP, STL /GUARD BIT OF SHIFT REGISTER
+LPROTL, RTL
+ RTL
+ SPA /DO WE HAVE 8 BITS SHIFTED IN?
+ JMP LPTELP
+ DCA LPTCDF /SAVE SHIFT REGISTER
+ TAD I LPTCA
+ JMS LPTPCH /PRINT A CHAR
+ TAD I LPTCA
+ ISZ LPTCA /BUMP INPUT POINTER
+LP7400, 7400 /PROTECT ISZ
+ AND LP7400
+ CLL RAL
+ TAD LPTCDF /SHIFT HIGH 4 BITS INTO
+ JMP LPROTL /SHIFT REGISTER
+
+LPTERR, STL CLA RAR /PUT 4000 IN AC
+ JMP LPTXIT /AND TAKE ERROR RETURN
+
+LPTWC, 0
+LPTCA, 0
+\f/CHAR PRINT ROUTINE
+
+LPTPCH, 0
+ AND (177
+ TAD (-175
+ SMA
+ JMP LPFLSH /FLUSH CODES 175-177
+ TAD (175-140
+ SMA
+ TAD LVCCNV /CONVERT LC TO UC IF DESIRED
+ TAD (140-33
+ SNA
+ TAD (11 /CHANGE ALTMODE TO $
+ IAC
+ SNA
+ JMP LPTCTZ /^Z - END OF FILE
+ TAD (32-11
+ SNA
+ JMP LPTTAB /TABS MUST BE SIMULATED
+LPLFHK, TAD (11 /RESTORE CHAR
+ SZA /FLUSH NULLS
+ JMS LPCHAR /
+ TAD LPLPTR /IF COL. CTR GT 0
+ SMA /WE HIT A CONTROL CHAR
+ TAD LPWDTH /OR EOL- SET TO FULL
+ DCA LPLPTR /WIDTH (NOTE LPLPTR=1 !)
+LP7700,
+LPFLSH, SMA CLA /NEVER SKIPS
+ JMP I LPTPCH /RETURN
+
+LPCHAR, 0 /LOW LEVEL PRINT ROUTINE
+ IFZERO LA180 <
+ NOP /NOP'S NEEDED FOR SET
+ LLS /PUT CHAR IN LPT BUFFER
+ NOP
+ >
+ IFNZRO LA180 <
+ CMA
+ DBTD /PUT CHAR IN LP BUFFER
+ CMA
+ >
+ AND LP7770 /KLUDGE - CLEARS COLUMN CTR
+ TAD LP7770 /ON CR, LF, VT, FF BUT ALSO
+ SNA CLA /ON ^H,^N, AND ^O. BIG DEAL
+ DCA LPLPTR /?SR RICHIE SAID 'LPCRFG'
+LP7600, 7600 /CLEAR AC
+LPCTCL, TAD LP7600
+ KRS
+ TAD (-7603 /CHECK FOR ^C FROM CONSOLE
+ SNA CLA
+ KSF /WITH FLAG UP
+ JMP .+3
+LPTCIF, CDF CIF 0 /YES, RETURN TO OS/8
+ JMP I LP7600
+ IFNZRO LA180 <DBST> /NO MUST BE HERE
+ IFZERO LA180 <LSF> /NO FOR SET
+ JMP LPCTCL /WAIT FOR FLAG
+ ISZ LPLPTR /CHECK LINE OVERFLOW
+ JMP I LPCHAR
+ TAD (15
+ JMS LPCHAR
+ CLA IAC
+ JMP LPLFHK
+\fLPTTAB, TAD LPBLNK /GET PSEUDO BLANK
+ JMS LPCHAR /PRINT IT
+ TAD LPWDTH
+ CMA
+ TAD LPLPTR /GET # CHARS IN LINE
+ AND LP0007
+LPBLNK, SZA CLA /LOOP 'TILL MULTIPLE OF 8
+ JMP LPTTAB
+ JMP I LPTPCH
+
+LPLPTR, 0
+ $
+\f
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