File: TD8ESY.PA of Disk: Disks/Working/Build-11-03-07
(Source file text)
/3 TD8E SYSTEM RESIDENT (12K) / / / / / / / / / /COPYRIGHT (C) 1974,1975 BY DIGITAL EQUIPMENT CORPORATION / / / / / / / / / / /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. / / / / / / / / / / *0 -3 DEVICE TD8E;DEVICE SYS;4211;6007;0;1341 DEVICE TD8E;DEVICE DTA0;4211;5007;0;1341 DEVICE TD8E;DEVICE DTA1;4211;SDTA1&177+5000;0;1341 TDBEGN-TD77-1 RELOC 7360 /THE BINARY GETS LOADED INTO 27220 INITIALY, AND /WRITTEN OUT AS PART OF RECORD 0. WHEN THE 30 WORD /BOOTSTRAP IS USED, THIS CODE GETS READ INTO 7400. SDSS=6771 SDST=6772 SDSQ=6773 SDLC=6774 SDLD=6775 SDRC=6776 SDRD=6777 TDBEGN, ZBLOCK 20 TDBOOT, TAD K7600 /128 WORDS PER PAGE DCA TDWCT SDSS /WAIT FOR A BLOCK MARK (TAPE IS JMP .-1 /STILL MOVING) SDRC AND TD77 TAD KM26 /IS IT A BLOCK MARK? SZA CLA JMP TDBOOT+2 /NO..WAIT A WHILE LONGER SDRD /GET THE BLOCK NO. TDBKNO, TAD TDM14 /NEED DECTAPE BLOCKS 154 & 155 (REC. 66) SZA CLA JMP TDBOOT+2 /NOT YET, BUSTER TDRGRD, SDSS JMP .-1 /NOW LET'S LOOK FOR A REVERSE GUARD WORD SDRC AND TD77 TAD KM32 SZA CLA JMP TDRGRD /KEEP LOOKING FOR IT JMS TDRQD JMS TDRQD JMS TDRQD /SKIP CONTROL WORDS CDF 10 /LOAD UP FIELD 1 TDREAD, JMS TDRQD /GET A DATA WORD DCA I TDPTR ISZ TDPTR /ARE WE DONE? JMP TDREAD /NOT YET ISZ TDBKNO /YES..LOOK AT BLOCK 15 TAD KCDF20 DCA TDREAD-1 /LOAD UP FIELD 2 ISZ M2 /DONE THIS JUNK? JMP TDBOOT /GO DO FIELD 2 SDLC /STOP THE TAPE CIF CDF 0 JMP I K7605 TDM14, -154 -155 /USE RECORD 66 TDPTR, TDWCT, 7600 TDRQD, 0 SDSQ JMP .-1 SDRD JMP I TDRQD K7600, 7600 KM26, -26 KM32, -32 KCDF20, CDF 20 M2, -2 K7605, 7605 TD77, 77 / THIS BOOTSTRAP RESIDES IN BLOCK 0 / BLOCK 1/2 CONTAINS THE USUAL IMAGE OF 07600 / BLOCK 66 CONTAINS THE IMAGE OF 17600 / BLOCK 66 1/2 CONTAINS THE IMAGE OF 27600 RELOC *200 /TD8E DECTAPE SYSTEM HANDLER /THIS HANDLER CAN DRIVE UNITS 0&1, AND IS PERMANENTLY /RESIDENT IN FIELDS 0&2. RELOC 7600 VERSION="B&77 ZBLOCK 7 SHNDLR, VERSION /UNIT 0 ENTRY POINT CLA CLL JMP SHND2 C3, 3 /MUST BE HERE FOR BUILD S70, 70 SDTA1, VERSION /UNIT 1 ENTRY CLA CLL CML SC1000, TAD SDTA1 /DOUBLES AS CONSTANT 1000 DCA SHNDLR /GET ARGS AT SHNDLR SHND2, RAR /UNIT # DCA SUNIT RDF /SETUP FOR EXIT TAD S6203 DCA EFLD TAD I SHNDLR /FUNCTION WORD SDLD /PUT IT IN DATA EGISTER AND S70 /SDLD DOES NOT 0 AC..GET FIELD TAD S6203 /CIF CDF N FOR TRANSFER FIELD DCA TFLD ISZ SHNDLR TAD I SHNDLR /BUFFER ADDRESS DCA BPTR ISZ SHNDLR TAD I SHNDLR /BLOCK #. TIMES 2 FOR REAL # CLL RAL DCA BLOCK ISZ SHNDLR /POINT TO ERROR EXIT CIF CDF 20 /PUT UNIT # INTO FIELD 2 TAD SUNIT DCA I SUNIT2 JMP F2SET /TO FIELD 2 FOR INIT. F1GO, SDRD /INITIAL DIRECTION TO LINK RAR JMP RGO RENTER, TAD BPTR /DONE THIS BLOCK..NEXT ADDRESS TAD SC200 DCA BPTR ISZ BLOCK /NEXT TAPE BLOCK..CAN'T SKIP CLL CML /FORCE FORWARD MOTION RGO, CLA CML RTR /LINK TO MOTION BIT TAD SC1000 TAD SUNIT SDLC /MOVE THE TAPE SDSQ JMP .-1 SDRD /KNOCK DOWN QUAD FLAG SDSQ JMP .-1 SDRD /THIS IS NEEDED, ELSE TIME ERROR!!! SRCH, SDSS /WAIT FOR A BLOCK MARK JMP .-1 SDRC /GET MARK TRACK BITS CLL RTL /DIRECTION TO LINK AND SC374 TAD SM110 /IS IT A N END ZONE? SNA JMP SENDZ /YES TAD SM20 /MAYBE A BLOCK MARK? SZA CLA JMP SRCH /NEITHER..KEEP GOING SDRD /READ THE BLOCK # SZL /IF REVERSE, LOOK 3 AHEAD OF TARGET TAD C3 CMA TAD BLOCK CMA SNA /IS IT THE RIGHT ONE? JMP FOUND /YES SM110, CLA SNA SZL /SNA SUPERFLUOUS..ONLY SZL VALID JMP SRCH /HEADED FOR IT..KEEP GOING SENDZ, SDRC CLL RTL SZL CLA /IF IN END ZONE FORWARD, GIVE ERROR JMP RGO CIF 20 /IF IT IS REALL END ZONE, AN ERROR JMP ERROR FOUND, SZL CLA /RIGHT BLOCK..HOW ABOUT DIRECTION? JMP RGO /WRONG..EXECUTE TURNAROUND TAD BPTR TFLD, HLT /GETS CIF CDF N CIF 20 JMP RDWT /LET'S TRANSFER DATA SEXIT, ISZ SHNDLR /NORMAL RETURN SEREX, TAD SUNIT /STOP THE TAPE SDLC CML CLA RAR /EITHER 0 OR 4000 IN AC ON RETURN EFLD, HLT JMP I SHNDLR BPTR=7755 BLOCK=7754 SUNIT=SDTA1 S6203, 6203 SC200, 200 SC374, 374 SM20, -20 SUNIT2, SXUNIT RELOC *400 RELOC 7600 /RUNS IN 27600 XPTR, 0 /BUFFER POINTER F2SET, CLA CLL CMA RTL /3 ERROR TRIES DCA TRYCNT TAD SXUNIT /MAKE SURE TAPE IS STOPPED SDLC F26203, CIF CDF 0 SDRD /FUNCTION WORD CLL RAL AND CX7600 /PAGE COUNT DCA XPGCT SDRD DCA SXFUN /SAVE THE FUNCTION WORD JMP F1GO RDWT, DCA XPTR /SAVE NEW BUFFER ADDRESS TAD CX7600 DCA XWCNT /128 WORDS PER BLOCK REVGRD, SDSS /WAIT FOR REVERSE GUARD WORD JMP .-1 SDRC AND X77 TAD XM32 /IS IT REVERSE GUARD? SZA CLA JMP REVGRD /NO TAD SXFUN SK7700, SMA CLA /READ OR WRITE? JMP READ /READ SDRC AND C300 /ERRORS ON WRITE LOCKOUT AND TIME SZA CLA JMP ERROR JMS RDQUAD /SKIP A WORD CX7600, 7600 TAD WRLP TAD SXUNIT SDLC /TURN ON THE WRITE CLA CMA JMS WRQUAD /WRITE 7777 IN REV. CHECKSUM CLA CMA DCA SCKSUM /AND ALSO IN COMPUTE CHECKSUM WRLP, TAD I XPTR JMS WRQUAD /WRITE THE DATA ISZ XPTR X77, 77 /JUST IN CASE ISZ XWCNT /DONE 128? JMP WRLP JMS WRQUAD /WRITE AND CHECKSUM A WORD OF 0 JMS GETCHK /GET CHECKSUM JMS WRQUAD JMS WRQUAD /LET CHECKSUM GET WRITTEN RWCOM, SDST /CHECK FOR TIME AND CHECKSUM ERRORS SZA CLA JMP ERROR /NOTE THAT LINK IS OFF AT RWCOM CIF CDF 0 TAD XPGCT /FINISHED TRANSFER? TAD CX7600 /LINK GOES ON HERE SNA JMP SEXIT /YES..GETOUT DCA XPGCT JMP RENTER READ, JMS RDQUAD /SKIP CONTROL WORDS JMS RDQUAD JMS RDQUAD /GET CHECKSUM AND X77 TAD SK7700 DCA SCKSUM SRDLP, JMS RDQUAD DCA I XPTR TAD I XPTR JMS EQUFUN ISZ XPTR C300, 300 ISZ XWCNT /DONE ALL? JMP SRDLP /NO JMS RDQUAD /READ AND CHECKSUM LAST WORD JMS EQUFUN JMS RDQUAD /GET CHECKSUM AND SK7700 JMS EQUFUN JMS GETCHK JMP RWCOM ERROR, CLA CLL /THIS CAUSES SEARCH REVERSE AT RGO CIF CDF 0 ISZ TRYCNT /EXHAUSTED ERROR TRIES? JMP RGO JMP SEREX /YES..FATAL EXIT WRQUAD, 0 /WRITE A 12 BIT WORD SDSQ JMP .-1 SDLD JMS EQUFUN /SDLD LEAVES AC ALONE JMP I WRQUAD RDQUAD, 0 /READ A 12 BIT WORD SDSQ JMP .-1 SDRD JMP I RDQUAD EQUFUN, 0 /EQUIVALENCE CHECKSUM CMA DCA EQUTMP TAD EQUTMP AND SCKSUM CIA CLL RAL TAD EQUTMP TAD SCKSUM DCA SCKSUM JMP I EQUFUN GETCHK, 0 TAD SCKSUM CLL CMA RTL RTL RTL JMS EQUFUN TAD SCKSUM AND SK7700 JMP I GETCHK SXUNIT, 0 XPGCT, 0 SXFUN, 0 TRYCNT, 0 XWCNT, 0 XM32, -32 SCKSUM, 0 EQUTMP, 0 /THE LAST 4 LOCS. ARE FREE FOR USE BY BATCH ZBLOCK 4 RELOC $