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Assembly Source File | 1984-04-29 | 11.1 KB | 336 lines

; DATE 10/13/83 19:10 LAST REVISION ; UNERA12.ASM ; BY: H.M. VAN TASSELL, 120 HILL HOLLOW RD, WATCHUNG NJ 07060 (201)755-5372 ; VERSION 1.2 IS A MINOR REVISION OF THE UNERA PROGRAM ON SIG/M VOL 76, ; (THERE WAS AN EARLIER RELEASE CALLED UNERA11 ON VOLUME 46). ; REVISED TO EXCLUDE 0E5H OR 00 AS FIRST LETTER OF FILENAME, THUS EMPTY ; DIRECTORY ENTRYS ARE NOT RECOVERED ON *.* WILDCARD, WHICH WOULD CAUSE THE ; DISK TO ACT AS IF THE DIRECTORY WAS FULL. ; PROGRAMME TO RECOVER ERASED FILE BOOT EQU 0 ;CP/M WARM BOOT JUMP VECTOR BDOS EQU 5 ;CP/M BDOS CALL JUMP VECTOR FCB EQU BOOT+5CH ;DEFAULT FILE CONTROL BLOCK ORG 100H ;START AT BASE OF TPA JMP STACK ;GET AROUND THE STACK BIN DB 48 ;48 IF CP/M 2.x, 42 IF CP/M 1.4 ; BE SURE TO SUPPLY A ; SECTRAN ROUTINE IF 1.4 HMSG DB 13,10,'UNERASE VERSION 1.2 (10/12/83) (CP/M VERSION $' MSG22 DB '2.x)',13,10,'$' MSG14 DB '1.4)',13,10,'$' ORG 200H ;GOOD PLACE TO START THE PROGRAM STACK LXI SP, STACK ;SET STACK POINTER CALL HELLO ;SIGN ON MESSAGE CALL PCHECK ;CHECK PARAMETERS CALL TRYFIX ;DO TH RECOVERY CALL BYE ;SIGN OFF MESSAGE JMP BOOT ;RETURN TO CP/M ; SAY WHO WE ARE HELLO LXI D,HMSG ;POINT TO HELLO MESSAGE CALL PRINT RET ; CHECK FOR VALID PARAMETERS AND SAY WHICH CP/M VERSION PCHECK CALL FCBCHK ;MAKE SURE FILE SPECIFIED CALL CPMCHK ;ESTABLISH CP/M VERSION RET ; LOOKS THROUGH THE DIRECTORY TRYING TO MATCH FCB FILENAME TRYFIX CALL NXTSECT ;GET A DIRECTORY SECTOR RZ ;RETURNS ZERO FLAG IF NO MORE CALL CHKENT ;CHECK IT OUT AND MABYE FIX JMP TRYFIX ;KEEP IT UP TILL DONE ; SIGN OFF AND RESET SYSTEM BYE MVI C,13 ;SYSTEM RESET CALL BDOS LDA FIXCNT ;CHECK FOR ACTIVITY ORA A JZ NOFIND ;SAY NONE FOUND LXI D,BMSG ;WARN FOUND CALL PRINT RET NOFIND LXI D,NFMSG CALL PRINT RET ; MAKES SURE A LEGAL FILENAME IS SPECIFIED FCBCHK LDA FCB ;GET DRIVE SPECIFICATION ORA A ;SEE IF DEAFAULT JNZ FCBCKI ;NO, GO CHECK FILENAME MVI C,25 ;ASK FOR CURRENT DRIVE CALL BDOS INR A ;OFFSET FOR NEXT INSTR FCBCKI DCR A ;CURRENT DRIVE NUMBER STA FCB ;SAVE IT LDA FCB+1 ;GET 1ST BYTE OF FILENAME CPI ' ' ;MAKE SURE IT IS NON BLANK RNC ;OK - KEEP GOING ; IF NO FILE NAME IS SPECIFIED, ABORT WITH NOTICE LXI D,NOFMSG CALL PRINT JMP BOOT ;ABORT ; CHECKS FOR CP/M VERSION AND SETS THINGS CPMCHK LXI D,80H ;SET DMA TO TBUFF MVI C,26 CALL BDOS MVI C,12 ;VERSION NUMBER REQUEST CALL BDOS CPI 20H ;EARLIER THAN 2.x? MVI A,42 ;ASSUME 1.4 LXI D,MSG14 ;POINT TO 1.4 MSG CNC CPM22 ;IF 2.x GO SET THINGS STA BIN ;SET THE MOVE LENGTH CALL PRINT CALL GETBIOS ;ESTABLISH BIOS JUMP VECTOR ; SELECT CALL DISK AND SETUP DISK PARAM HEADER LDA FCB ;GET THE DISK MOV C,A MVI B,0 CALL SELDSK ;MAKE SURE DRIVE IS MOV A,H ;SELECTED ORA L JZ ILDISK LDA BIN CPI 48 ;IF CP/M 1.4 SKIP REST RC MOV E,M ;GET THE ADDRESS INX H ; OF THE XLT0 MOV D,M XCHG SHLD DPH ;SAVE THE ADDRESS RET ; IF CP/M 2.x DETERMINE NUMBER OF DIRECTORY ENTRIES ALSO CPM22 MVI C,31 ;GET DISK PARMS ADDRESS CALL BDOS ;DPB ADDR IN HL ON RET LXI D,7 ;OFFSET TO DRM DAD D MOV E,M ;GET NUMBER OF INX H ; DIRECTORY ENTRIES MOV D,M XCHG INX H ;ACCOUNT FOR - 1 CALL SHFTHL2 ;SHIFT HL RIGHT 2 MOV A,L ;GET NUMBER OF SECTORS STA DIRMAX ;SAVE NUMB DIR SECS LXI H,5 ;NOW POINT TO SYSTEM DAD D ; TRACK OFFSET MOV A,M ;PICK UP NUMBER OF STA TRACK ;SAVE TRACK OFFSET MVI A,48 ;SET MOVE LENGTH LXI D,MSG22 ;POINT TO 2.x MSG RET ; GET BIOS JUMP VECTORS FOR EASY REFERENCE GETBIOS LHLD BOOT+1 ;POINTS TO BIOS JUMP TABLE+3 LXI D,WBOOT ;WHERE WE WILL KEEP A COPY LDA BIN ;NUMBER OF BYTES TO MOVE MOV B,A ;MOVE LIKES IT IN REG B CALL MOVE ;MOVE THE TABLE RET ; READS NEXT SECTOR (GROUP OF 4 DIRECTORY ENTRIES) ; RETURNS WITH ZERO FLAG SET OF NO MORE NXTSECT LDA DIRMAX ;SEE IF MORE SECTORS ORA A RZ ;RETURNS ZERO FLAG IF NO MORE LDA TRACK ;SET TRACK MOV C,A MVI B,0 CALL SETTRK LDA SECTOR ;SET SECTOR MOV C,A CALL TRANSLT MVI B,0 CALL SETSEC CALL READ ;READ A SECTOR ANI 1 XRI 1 ;REVERSE SENSE OF ERROR FLAG RET ;RETURNS WITH ZERO FLAG SET ; IF BAD READ ; CHECKS THE CURRENT 4 DIRECTORY ENTRIES AGAINST ARGUMENT ; IF MATCH, REWRITES SECTOR WITH REACTIVATED 1ST BYTES CHKENT XRA A ;ASSUME NO REWRITE STA REWRT MVI B,4 ;NUMBER OF ENTRIES PER SECTOR LXI H,80H ;BEGINNING OF BUFFER CKLUP MOV A,M CPI 0E5H ;IF E5 ITS NOT ACTIVE DIR. JNZ CKINC INX H MOV A,M ;CHECK SECOND BYTE DCX H CPI 0E5H ;CPM 1.4 &2.2 USE E5 FILL JZ CKINC ;FOR FORMATING CPI 00H ;BUT CPM 3.0 USES 00 FILL JZ CKINC ;DONT RECOVERY FORMATED ENTRYS! PUSH H ;SAVE BEGINNING ADDR CALL COMPAR ;COMPARE WITH ARGUMENT POP H JNZ CKINC ;NO MATCH MVI M,0 ;RESET FLAG FOR ACTIVE MVI A,0FH ;SAY NEEDS REWRITE STA REWRT LDA FIXCNT INR A ;BUMP COUNT OF CHANGES STA FIXCNT CKINC LXI D,32 ;LENGTH OF ENTRY DAD D DCR B JNZ CKLUP LDA REWRT ;SEE OF NEED REWRITE ORA A JZ CKDONE ;NO - DONE ; WRITE THE DIRECTORY SECTOR BACK TO THE DISK LDA TRACK ;SET TRACK MOV C,A MVI B,0 CALL SETTRK LDA SECTOR ;SET SECTOR MOV C,A CALL TRANSLT MVI B,0 CALL SETSEC CALL WRITE ;WRITE THE SECTOR BACK ORA A ;ABORT IF ERROR JNZ ERRWRT CKDONE LDA DIRMAX DCR A ;REDUCE SECTORS LEFT STA DIRMAX LDA SECTOR ;POINT TO NEXT SECTOR INR A STA SECTOR RET ; COMPARE 11 BYTES OF DIRECTORY ENTRY AGAINST ARGUMENT COMPAR INX H LXI D,FCB+1 XCHG MVI C,11 CMPR1 mvi a,03fh ; '?' cmp m jz cmpr2 ; it's a wild char, anything will do LDAX D ;GET DIR ENT CHAR ANI 7FH ;STRIP ANY FLAGS CMP M RNZ ;DONE IF NO MATCH cmpr2: INX D INX H ;BUMP TO NEXT CHAR DCR C JNZ CMPR1 ;LOOP FOR 11 CHAR RET ;RETURNS ZERO FLAG SET FOR MATCH ; GENERAL PURPOSE MOVE ROUTINE. ; FROM (HL) TO (DE) FOR COUNT OF B MOVE MOV A,M ;GET A BYTE STAX D ;PUT A BYTE INX D ;INCREMENT TO NEXT INX H DCR B ;COUNT DOWN JNZ MOVE RET ; SHIFT REGS HL RIGHT 2 BITS LOGICAL SHFTHL2 CALL SHFTHL SHFTHL XRA A ;CLEAR CARRY MOV A,H RAR ;SHIFTED BIT IN CARRY MOV H,A MOV A,L RAR MOV L,A RET ; GENERAL PRINT ROUTINE ENTER WITH REG DE POINTING TO MSG ; RETURNS TO CALLER FROM BDOS PRINT MVI C,9 ;BDOS PRINT STRING COMMAND JMP BDOS ;GO DO THE PRINT ; SPECIFIED AN ILLEGAL DISK DRIVE - ABORT ILDISK LXI D,ILMSG CALL PRINT JMP BOOT ;ABORT ; ERROR OCCURED DURING DISK WRITE - ABORT ERRWRT LXI D,WMSG CALL PRINT JMP BOOT ;ABORT ; TRANSLATE REG C FROM LOGICAL TO PHYSICAL SECTOR NUMBER TRANSLT LHLD DPH ;GET ADDRESS OF XLT0 XCHG CALL SECTRAN MOV C,L RET ; THIS IS THE WORKING COPY OF THE BIOS JUMP TABLE ; IF CP/M 2.x, NO CHANGES ARE NECESSARY ; IF CP/M 1.4, SECTRAN IS NOT COPIED FROM BIOS ; BE SURE TO CORRECT THE INCLUDED ; VERSION FOR YOUR OWN DISK SYSTEM WBOOT DS 3 CONST DS 3 CONIN DS 3 CONOUT DS 3 LIST DS 3 PUNCH DS 3 READER DS 3 HOME DS 3 SELDSK DS 3 SETTRK DS 3 SETSEC DS 3 SETDMA DS 3 READ DS 3 WRITE DS 3 LISTST DS 3 SECTRAN JMP STRAN ; SECTOR TRANSLATION ROUTINE FOR ; CP/M VERSIONS EARLIER THAN 2.0 ; REG DE CONTAINS ADDRESS OF XLT0 ; REG BC CONTAINS THE LOGICAL SECTOR NUMBER ; RETURNS PHYSICAL SECTOR NUMBER IN REG HL STRAN MVI B,0 XCHG DAD B MOV L,M RET ; ADDRESS OF TRANSLATE TABLE DPH DW XLT0 DS 14 ; THIS IS THE STANDARD TRANSLATE TABLE XLT0 DB 1,7,13,19,25,5,11,17,23,3,9,15,21 DB 2,8,14,20,26,6,12,18,24,4,10,16,22 ; WORKING STORAGE FOLLOWS DIRMAX DB 16 ;NUMBER OF SECTORS IN DIRECTORY = ;MAXIMUM NUMBER OF DIRECTORY ENTRIES ; DIVIDED BY 4 (ENTRIES PER SECTOR) TRACK DB 2 ;TRACK NUMBER OF DIRECTORY SECTOR DB 0 ;CURRENT SECTOR NUMBER FIXCNT DB 0 ;NUMBER OF ENTRIES FIXED REWRT DB 0 ;REWRITE FLAG 0=NO, F=YES WMSG DB 10,13,'ERROR OCCURED DURING DISK WRITE - ABORT$' ILMSG DB 10,13,'SPECIFIED AN ILLEGAL DISK DRIVE - ABORT$' BMSG DB 10,13,'RECOVERED - PLEASE DOUBLE CHECK BEFORE USING$' NOFMSG DB 10,13,'NO FILE NAME SPECIFIED - ABORT$' NFMSG DB 10,13,'FILE NOT FOUND$' END 100H