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Uade11.asm
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;.OPT
;UADE11;> Uade11
;.TTL
;Fileserver file UADE11
.UADE11
;************************
;* Restart one drive *
;* Disc number -> name *
;* Disc name -> number *
;* *
;* U T I L I T I E S *
;************************
;.MPENSR
; LDA #0
; JMP MPEXIT
;MPFRSP: FREE SPACE
;ENTRY:
;ARGB = LS(DISC NUMBER)
;ARGC = MS(DISC NUMBER)
;ARGD = LS(SIN)
;ARGE = CS(SIN)
;ARGF = MS(SIN)
;ARGG = LS ptr to user info
;ARGH = MS ptr to user info
;EXIT:
;ARGA = RC
;FUNCTION: MAPTB IS SEARCHED TO FIND THE RELEVANT ENTRY. IF THE SECTOR
;MAP IS NOT IN STORE IT IS READ IN. THE SIN IS CHECKED TO ENSURE THAT IT
;POINTS TO THE FIRST BLOCK OF THE CHAIN. ALL THE SECTORS ON THE CHAIN ARE
;THEN ADDED TO THE FREE CHAIN. THE FREE SECTOR COUNT IS THEN ADJUSTED. THE
;DIRTY FLAG FOR THE SECTOR MAP IS SET.
.MPFRSP
{
JSR FNDMAP;GET CURRENT MAP TABLE POSITION
BNE MPFSND
LDA #0
STA ERRTYP
STA DNDLTE
LDY #ARGG
JSR MPFRAD
BNE MPFSND
JSR MPDLTE
BNE MPFSND
JSR ENSMB
JSR ENSBM
LDA #0; REPLY ZERO
.MPFSND
LDY #ARGG
JSR MPSETF
JMP MPEXIT
}
.MPREDR;MPREDR
{
;*** RESTART ONE DRIVE **
;ENTRY:
;ARGB = DRIVE NO.
;EXIT:
;ARGA = RC
LDA #0
STA ERRTYP
LDA BBUF
STA DSCCB+TRADD;SET UP AREA TO READ IN SECTOR TWO
STA MPSCPT
LDA BBUF + 1
STA DSCCB+TRADD + 1
STA MPSCPT + 1
LDY #ARGB
LDA (ARGPTR),Y
STA CURDRV;SET CURRENT DRIVE
STA MPDRVE
JSR RDSTWO;GET SECTOR ZERO TO BIG BUFFER
JSR CHKDSC;CHECK DISC IS FS DISC
BNE MPDREX
JSR SMPPTR;SET POINTER TO RELEVANT MAPTAB ENTRY
;Store old MAPTB entry, so that if an error
;occurs, MAPTB can be replaced.
; Having stored old MAPTB entry, replace with stuff
;from sector zero.
LDY #MPDCNO
.MPDRL1
LDA (MAPPTR),Y
STA MAPTBF -MPDCNO,Y
INY
CPY #MPTBSZ
BNE MPDRL1
JSR SMAPEN;Move sector zero info. from BBUF
JSR MPMPSZ;Get size of disc
JSR DIVSEC; GET NO. OF TRACKS
LDY #MPNOCY
CLC
LDA MPTMPB;CALCULATE SIZE OF CY.MAP
STA (MAPPTR),Y; SAVE NO. OF TRACKS
INY
ROL MPTMPB; MULTIPLY TRACKS BY TWO
LDA MPTMPB+ 1
STA (MAPPTR),Y
ROL MPTMPB+ 1
JSR CHMPSZ;CHECK MAP WILL FIT IN AVAILABLE SPACE
BNE MPDRAB
JSR MPSTCY;SET CORRECT MAP (MOST RECENT)
JSR AGENTB;AGE NAME TABLE
LDA BBUF
STA MPSCPT
LDA BBUF + 1
STA MPSCPT + 1;CHMAPS destroys MPSCPT
LDA MAPTBF
STA CURDSC;Set disc no. for FNDDNO
LDA MAPTBF + 1
STA CURDSC + 1
JSR FNDDNO;Find name table entry of old disc
LDA #UNUSED
LDY #NTUSED
STA (DNMPTR),Y;Mark old disc unused
JSR CHDNAM;CHECK DISC NAME AND PUT IN NAME TABLE
BNE MPDRAB;POSSIBLY NOT UNIQUE DISC
LDA #0;=> Success
.MPDREX
JMP MPEXIT;*** EXIT **
.MPDRAB
PHA ;Error exit !!
LDY #MPTBSZ - 1
.MPDNL2
LDA MAPTBF,Y
STA (MAPPTR),Y;Restore MAPTB information,
DEY ;so that state is as before
BPL MPDNL2
PLA
JMP MPDREX
}
;MPDSND
;ENTRY:
;ARGB = LS(DISC NUMBER)
;ARGC = MS(DISC NUMBER)
;EXIT:
;ARGA = RC
;ARGB = DRIVE NO.
;FUNCTION: SEARCH MAPTB FOR DISC NUMBER
;AND RETURN DRIVE
.MPDSND
JSR FNDMAP
PHA
LDY #ARGB
LDA MPDRVE
STA (ARGPTR),Y
PLA
JMP MPEXIT
;MPDSNB:
;ENTRY:
;ARGB = DRIVE NUMBER
;EXIT: ARGA = RC
;ARGB = LS(DISC NUMBER)
;ARGC = MS(DISC NUMBER)
;FUNCTION: FINDS THE RELEVANT ENTRY
;IN MAPTB AND RETURNS THE DISC NUMBER CURRENTLY
;ON THAT DRIVE.
.MPDSNB
{
LDY #ARGB;TO FIND DRIVE NUMBER
LDA (ARGPTR),Y
CMP DRIVES
BCS MPDSER;BRANCH IF LEG PULL
STA CURDRV
JSR SMPPTR
LDY #MPNOCY
LDA (MAPPTR),Y
INY
ORA (MAPPTR),Y
BEQ MPDSER;IF NO. OF CYLINDERS == 0
;ENTRY FOUND SO LOOK AT IT
LDY #MPDCNO;FOR DISC NUMBER
LDA (MAPPTR),Y
LDY #ARGB;TO SAVE IT FOR RETURN
STA (ARGPTR),Y
LDY #MPDCNO + 1
LDA (MAPPTR),Y
LDY #ARGC
STA (ARGPTR),Y
LDA #0;RC
BEQ MPDSND
.MPDSER
LDA #MPERRF
.MPDSND
JMP MPEXIT
}
.MPDNNA;MPDNNA
{
;ENTRY:
;ARGB = PTR TO DISC NAME (LO)
;ARGC = PTR TO DISC NAME (HI)
;EXIT:
;ARGB = DISC NO. (LO)
;ARGC = DISC NO. (HI)
LDY #ARGB
LDA (ARGPTR),Y
STA GENPTR
INY
LDA (ARGPTR),Y
STA GENPTR + 1
LDY #0
LDA (GENPTR),Y
CMP #CR
BNE MPDNLA
LDA #MPERRK
BNE MPDNEX;null disc name
.MPDNLA
LDA (GENPTR),Y
CMP #CR
BEQ MPDNLB;ARG. IS TERMINATED CR, SO NEEDS PADDING
STA DNMBUF,Y
INY
JMP MPDNLA
.MPDNLB
LDA #SPACE
.MPDNLC
CPY #DNAMLN;CONTINUE PADDING ?
BCS MPDNLD;NOPE, Y>=DNAMLN
STA DNMBUF,Y;YEP, CONTINUE
INY
BNE MPDNLC
.MPDNLD
JSR FNDNAM;LOOK UP NAME IN NAME TABLE
BNE MPDNEX;NOT FOUND ...
LDY #NTDNO
LDA (DNMPTR),Y
PHA
INY
LDA (DNMPTR),Y
LDY #ARGC
STA (ARGPTR),Y
PLA
DEY
STA (ARGPTR),Y
LDA #0
.MPDNEX
JMP MPEXIT
}
.MPNADN;MPNADN
{
;** DISC NO. -> DISC NAME **
;ENTRY:
;ARGB = DISC NO. (LO)
;ARGC = DISC NO. (HI)
;EXIT:
;ARGB = PTR. TO NAME (LO)
;ARGC = PTR. TO NAME (HI)
;RETURN CODE INDICATES FOUND
LDY #ARGB
LDA (ARGPTR),Y
STA CURDSC
INY
LDA (ARGPTR),Y
STA CURDSC + 1
JSR FNDDNO
BEQ MPNDON
LDA #MPERRA;DISC NO. NOT FOUND
BNE MPNDEX
.MPNDON
LDY #ARGB
CLC
LDA DNMPTR
ADC #NTNAME
STA (ARGPTR),Y
INY
LDA DNMPTR + 1
ADC #0
STA (ARGPTR),Y
LDA #0;OK EXIT ...
.MPNDEX
JMP MPEXIT
}
.MPFREE
{
; RETURN SIZE OF FREE CHAIN
;
; ON ENTRY
; ARGB LS(DISC NO)
; ARGC MS " "
;
; ON EXIT
; ARGB LS (SIZE)
; ARGC CS (")
; ARGD MS (")
; ARGE LS (TOTAL SPACE)
; ARGF CS (")
; ARGG MS (")
;
JSR FNDMAP;GET MAP TO STORE
BNE MPFREX
LDY #MPCYMP
LDA (MAPPTR),Y
STA MPCYPT
INY
LDA (MAPPTR),Y
STA MPCYPT + 1
LDY #0
LDA (MPCYPT),Y;GET FREE SPACE
STA MPTMPA
INY
LDA (MPCYPT),Y
STA MPTMPA + 1
INY
LDA (MPCYPT),Y
STA MPTMPA + 2
LDY #ARGB
LDA MPTMPA
STA (ARGPTR),Y
INY
LDA MPTMPA + 1
STA (ARGPTR),Y
INY
LDA MPTMPA + 2
STA (ARGPTR),Y
LDY #MPSCTT
LDA (MAPPTR),Y
STA MPTMPA
INY
LDA (MAPPTR),Y
STA MPTMPA +1
INY
LDA (MAPPTR),Y
LDY #ARGG
STA (ARGPTR),Y
DEY
LDA MPTMPA +1
STA (ARGPTR),Y
DEY
LDA MPTMPA
STA (ARGPTR),Y
LDA #0
.MPFREX
JMP MPEXIT
}
;MPZDSK: ZERO AREA OF DISC
;
;ENTRY: ARGB LS(DISC NUMBER)
;ARGC MS(DISC NUMBER)
;ARGD LS(SIN)
;ARGE CS(SIN)
;ARGF MS(SIN)
;ARGG LS(OLD SIZE)
;ARGH CS(OLD SIZE)
;ARGI MS(OLD SIZE)
;
;EXIT: ARGA = RC
;
.MPZDSK
JSR MPSTTA;MPTMPA := SIN (ARGD,E,F)
;Y:=ARGG
LDA (ARGPTR),Y
STA OLDSZE
INY
LDA (ARGPTR),Y
STA OLDSZE + 1
INY
LDA (ARGPTR),Y
STA OLDSZE + 2
LDA #0
STA OLDSZE + 3
JSR ZERDSK
JMP MPEXIT
;**********************************
;* M A P M A N *
;* U T I L I T I E S *
;**********************************
; READS THE SPECIFIED BIT MAP INTO STORE
;
; ON ENTRY
; MPTMPC IS CYLINDER NUMBER OF BIT MAP
;
; ON EXIT
; MPSCPT POINTS TO BIT MAP
; MPBLOK ADDRESS OF BIT MAP BLOCK
.RDBTMP;READ BIT MAP
{
LDA #0;ZERO OUT SIN
STA CBSIN
STA CBSIN + 1
STA CBSIN + 2
STA MPSCPT
;STA MPSCPT + 1
LDY #MPSZCY
LDA (MAPPTR),Y
BNE RBMCBM;COMPRESSED BIT MAP
LDA MPTMPC; GET CYLINDER NUMBER
STA CBTPPT;SAVE FOR DECREMENTING
LDA MPTMPC + 1
STA CBTPPT + 1
JSR RBMLP
.RBMBMP
JSR SETBM;GET SIZE & POINTER
JSR GTBTS;READ IN BLOCK IF NECESSARY
BNE RBMND;NON-ZERO IF FAILED
CLC
LDA CBSTA;GET STORE ADDRESS (START OF SECTOR)
STA MPBLOK
ADC MPSCPT;BYTE OFFSET
STA MPSCPT
LDA CBSTA + 1
STA MPBLOK + 1
;ADC MPSCPT + 1
ADC #0
STA MPSCPT + 1
LDA ERRTYP
BEQ RBMR1
LDA RSTFLG
BNE RBMR2
LDA #IERRAJ
JSR INTERR
.RBMR2
LDA CBSTA
STA CLRPTR
LDA CBSTA + 1
STA CLRPTR + 1
LDY #0
LDX #1
JSR CLRSTR
.RBMR1
LDA #0
.RBMND
RTS
;COMPRESSED BIT MAP
.RBMCBM
{
LDY #MPSCYL;START CYLINDER
LDA (MAPPTR),Y
STA CBTPPT
INY
LDA (MAPPTR),Y
STA CBTPPT + 1
JSR RBMLP;CBSIN = SIN OF BIT MAP
LDA MPTMPC; GET CYLINDER NUMBER
STA CBTPPT;SAVE FOR DECREMENTING
LDA MPTMPC + 1
STA CBTPPT + 1
.RBMLL
LDA CBTPPT;CHECK IF CYLINDER FOUND
ORA CBTPPT + 1
BEQ RBMBMP;FOUND SO GO AND READ IN
LDA CBTPPT
BNE RBMLLA
DEC CBTPPT + 1
.RBMLLA
DEC CBTPPT;DECREMENT CYLINDER COUNTER
LDY #MPSZCY
CLC
LDA MPSCPT;BYTE OFFSET
ADC (MAPPTR),Y;BYTES REQUIRED TO HOLD CYLINDER'S BIT MAP
BEQ RBMLLB;NEXT SECTOR
STA MPSCPT
ADC (MAPPTR),Y
BCC RBMLL
BEQ RBMLL
;ELSE, DOESN'T FIT SO NEXT SECTOR
.RBMLLB
;NEXT BIT MAP SECTOR
LDA #0
STA MPSCPT
INC CBSIN
BNE RBMLL
INC CBSIN + 1
BNE RBMLL
INC CBSIN + 2;CBSIN += 1
JMP RBMLL
}
.RBMLP
{
LDA CBTPPT;CHECK IF CYLINDER FOUND
ORA CBTPPT + 1
BEQ RBMND;FOUND SO EXIT AND READ IN
LDY #MPSPCY;SECTORS / CYLINDER
CLC
LDA CBSIN
ADC (MAPPTR),Y
STA CBSIN
INY
LDA CBSIN + 1;GET TO NEXT BIT MAP
ADC (MAPPTR),Y
STA CBSIN + 1
BCC RBMLP1
INC CBSIN + 2
.RBMLP1
LDA CBTPPT ; DECREMENT CYLINDER COUNTER
BNE RBMLP2
DEC CBTPPT + 1
.RBMLP2
DEC CBTPPT
JMP RBMLP
}
}
;
; READ THE SPECIFIED MAP BLOCK INTO STORE
;
; ON ENTRY
; MPTMPA HOLDS SIN
; CARRY SET IF BLOCK NOT TO BE READ IN
;
; ON EXIT
; MAPTMP HOLDS POINTER
;
.RMPBK2
JSR MPSTTA;MPTMPA := SIN (ARGD,E,F)
CLC;READ BLOCK
.RDMPBK;READ IN MAP BLOCK
{
PHP ;SAVE STATE OF CARRY FLAG
LDA MPTMPA;GET SIN TO RIGHT PLACE
STA CBSIN
LDA MPTMPA + 1
STA CBSIN + 1
LDA MPTMPA + 2
STA CBSIN + 2
LDA MBCBPT; GET CORRECT POINTER
STA GNCBPT
LDA MBCBPT + 1
STA GNCBPT + 1
LDA #NOMPBK;NUMBER OF MAP BLOCK ENTRIES
STA NCBDB
PLP ;GET CARRY FLAG BACK
BCS RMBNR;BRANCH IF NOT TO BE READ IN
JSR GTBTS; GET THE MAP BLOCK TO STORE
BNE RMBND; NON-ZERO IF FAILED
LDA CBSTA;SAVE ADDRESS IN CORRECT PLACE
STA MAPTMP
STA GNCBPT
LDA CBSTA + 1
STA MAPTMP + 1
STA GNCBPT + 1
LDY #MBSQNO;POINT TO FIRST SEQUNCE NUMBER
LDA (GNCBPT),Y
TAX
CLC
LDA GNCBPT
ADC #LO(LSTSQ)
STA GNCBPT
LDA GNCBPT + 1
ADC #HI(LSTSQ)
STA GNCBPT + 1
LDY #0
TXA
CMP (GNCBPT),Y;COMPARE WITH LAST NUMBER
BEQ RDMBND
LDA #MPERRC
RTS
.RDMBND
LDA #0
.RMBND
RTS
.RMBNR
JSR FNDMB
BCC RMBSK1
LDY #CBSA
JMP RMBSK2
.RMBSK1
JSR GETFR;JUST FIND A FREE SPACE
BNE RMBND
LDY #CBDR
LDA MPDRVE
STA (GNCBPT),Y
LDY #CAFLG
LDA (GNCBPT),Y
ORA #1;FLAG ALLOCATED
STA (GNCBPT),Y
INY
LDA MPTMPA
STA (GNCBPT),Y
INY
LDA MPTMPA + 1
STA (GNCBPT),Y
INY
LDA MPTMPA + 2
STA (GNCBPT),Y
INY
.RMBSK2
LDA (GNCBPT),Y;GET ADDRESS OF FREE STORE
STA MAPTMP
STA CLRPTR
INY
LDA (GNCBPT),Y
STA MAPTMP + 1
STA CLRPTR + 1
LDY #LO(BTINBK)
LDX #HI(BTINBK)
JSR CLRSTR;CLEAR MAP BLOCK TO ZEROES SINCE NOT READ IN
JMP RDMBND
}
; CALCULATE THE NUMBER OF SECTORS REQUIRED FROM
; THE NUMBER OF BYTES REQUIRED.
;
; ON ENTRY
; DIVPAR HOLDS THE NUMBER OF BYTES
;
; ON EXIT
; DIVPAR HOLDS ODD BYTES
; DIVTMP HOLDS THE NUMBER OF BLOCKS
; Carry Set if Overflow
;
.DVDE
{
LDA #0
STA DIVTMP
STA DIVTMP+ 1
STA DIVTMP+ 2
LDA DIVPAR
ORA DIVPAR+ 1
ORA DIVPAR+ 2
BEQ DIVONE
.DIVLP
SEC ;NOW LOOP DO DIVIDE BY BLOCK SIZE
LDA DIVPAR
SBC #LO(BTINBK)
STA DIVPAR
LDA DIVPAR+ 1
SBC #HI(BTINBK)
STA DIVPAR+ 1
LDA DIVPAR+ 2
SBC #0
STA DIVPAR+ 2
BCC DIVNO;CARRY CLEAR AT END OF DIVISION
LDA DIVPAR
ORA DIVPAR + 1
ORA DIVPAR + 2
BEQ DIVS1
INC DIVTMP
BNE DIVLP
INC DIVTMP+ 1
JMP DIVLP
.DIVNO
LDA DIVPAR;REPLACE LOWER BYTE
ADC #LO(BTINBK)
STA DIVPAR
LDA DIVPAR+ 1
ADC #HI(BTINBK)
STA DIVPAR+ 1
BCC DIVS1
INC DIVPAR+ 2
.DIVS1
CLC
LDA DIVTMP
ADC #2;AT LEAST TWO BLOCKS LONG
STA DIVTMP
BCC DIVOK
INC DIVTMP + 1
BNE DIVOK
INC DIVTMP + 2
BNE DIVOK
SEC;OVERFLOW
RTS
.DIVONE
INC DIVTMP
.DIVOK
CLC
RTS
}
;GETPOS
; FINDS NEXT FREE POSITION IN MAP BLOCK
; SETS CARRY FLAG IF MAP BLOCK FULL
;
; ON ENTRY
; MAPGEN POINTS TO START OF MAP BLOCK
;
; ON EXIT
; MAPGEN POINTS TO NEXT FREE POSITION
;
; USES
; MPTMPE
;
.GETPOS
{
CLC
LDA MAPGEN
ADC #LO(MBENTS);GET MAPGEN TO START OF ENTRIES
STA MAPGEN
LDA MAPGEN+ 1
ADC #HI(MBENTS)
STA MAPGEN+ 1
LDA #0
STA MPTMPE
STA MPTMPE+ 1;CLEAR VARIABLES
.GPLP
LDA MPTMPE
CMP #LO(MXENTS- 1);CHECK FOR END OF LIST
LDA MPTMPE+ 1
SBC #HI(MXENTS- 1)
BCS GPEXIT;RETURNS WITH CARRY SET IF END OF LIST
LDY #0;Y POINTS AT SIN
LDA (MAPGEN),Y
BNE GPSK; ZERO IS END OF LIST
INY
LDA (MAPGEN),Y
BNE GPSK
INY
LDA (MAPGEN),Y
BEQ GPFND
.GPSK
CLC ;LOOK AT NEXT ENTRY
LDA MAPGEN
ADC #ENSZ
STA MAPGEN
BCC GPSK2
INC MAPGEN+ 1
.GPSK2
INC MPTMPE;MPTMPE HOLDS NUMBER OF ENTRIES WE'VE LOOKED AT
BNE GPLP
INC MPTMPE+ 1
JMP GPLP
.GPFND
CLC
.GPEXIT
RTS ;RETURNS HERE WITH CARRY CLEAR, ALL OK.
}
; GET CYLINDER MAP POSITION
;
; STARTS A SEARCH FROM MPTMPC FOR THE NEXT
; CYLINDER WITH A FREE SECTOR
;
; ON ENTRY
; MPTMPC HOLDS THE CURRENT CYLINDER
; MAPGEN POINTS TO START OF CYLINDER MAP
; MAPPTR POINTS TO MABTB ENTRY
;
; ON EXIT
; MAPGEN POINTS TO CYLINDER WITH FREE ENTRY
;
; USES
; MPTMPE
;
.GTCYPS
{
LDA MPTMPC
STA MPTMPE;SAVE CURRENT POSITION
LDA MPTMPC+ 1
STA MPTMPE+ 1
CLC
LDA MAPGEN;POINT TO START OF MAP
ADC #3
STA MAPGEN
BCC MELP2
INC MAPGEN+ 1
.MELP2
LDA MPTMPE;CHECK IF POSITION FOUND
ORA MPTMPE+ 1
BEQ GCPS1
CLC
LDA MAPGEN
ADC #2;FOR NEXT ENTRY
STA MAPGEN
BCC GCPSA
INC MAPGEN + 1
.GCPSA
LDA MPTMPE
BNE GCPSB
DEC MPTMPE+ 1
.GCPSB
DEC MPTMPE
JMP MELP2
.GCPS1
LDA MPTMPC
STA MPTMPE
LDA MPTMPC + 1
STA MPTMPE + 1
.MEFD1
LDY #0;NOW LOOK FOR POSITION WITH FREE BLOCK
LDA (MAPGEN),Y
INY
ORA (MAPGEN),Y
BNE GTND;FOUND IF NON ZERO
INC MPTMPE
BNE GCPSC
INC MPTMPE+ 1
.GCPSC
LDA MPTMPE
LDY #MPNOCY;CHECK FOR END OF CYCLINDER MAP
CMP (MAPPTR),Y
INY
LDA MPTMPE+ 1
SBC (MAPPTR),Y
BCS MEFBKG
LDA #2;NOT END SO LOOK AT NEXT ENTRY
.GCPSD
CLC
ADC MAPGEN
STA MAPGEN
BCC MEFD1
INC MAPGEN+ 1
BCS MEFD1;ALWAYS
.MEFBKG
LDA #0;END SO BACK TO BEGINNING
STA MPTMPE
STA MPTMPE+ 1
LDY #MPCYMP
LDA (MAPPTR),Y;GET START OF CYLINDER MAP
STA MAPGEN
INY
LDA (MAPPTR),Y
STA MAPGEN + 1
LDA #3
BNE GCPSD
.GTND
RTS
}
; FIND CYLINDER
;
; FINDS THE CYCLINDER WITH THE LARGEST AMOUNT
; OF FREE SPACE
;
; ON ENTRY
; MPCYPT POINTS TO START OF CYLINDER MAP
;
; ON EXIT
; MPCYPT POINTS TO CYLINDER FOUND
;
; USES
; MAPTMP
; MPTMPA
; MPTMPB
;
.FNDCY
{
LDA #0
STA MAPTMP;ZERO VALUES
STA MAPTMP+ 1
STA MPTMPA
STA MPTMPA + 1
STA MPTMPC
STA MPTMPC + 1
CLC
LDA MPCYPT;GET TO START OF ENTRIES
ADC #3
STA MPCYPT
STA MPTMPB
LDA MPCYPT+ 1
ADC #0
STA MPCYPT+ 1
STA MPTMPB+ 1
.FNDLP
LDY #0;NOW SCAN ENTRIES FOR LARGEST
LDA MAPTMP
CMP (MPCYPT),Y
INY
LDA MAPTMP + 1
SBC (MPCYPT),Y; MAPTMP HOLDS LARGEST SO FAR
BCS FNDSK;BRANCH IF NOT LARGER
LDA (MPCYPT),Y
STA MAPTMP+ 1
DEY
LDA (MPCYPT),Y
STA MAPTMP
LDA MPCYPT;SAVE POSITION
STA MPTMPB
LDA MPCYPT+ 1
STA MPTMPB+ 1
LDA MPTMPA
STA MPTMPC;SAVE CYLINDER NUMBER
LDA MPTMPA + 1
STA MPTMPC + 1
.FNDSK
CLC
LDA MPCYPT
ADC #2;MOVE TO NEXT ENTRY
STA MPCYPT
BCC FNDSK2
INC MPCYPT+ 1
.FNDSK2
INC MPTMPA
BNE FNDSK3
INC MPTMPA + 1
.FNDSK3
LDY #MPNOCY;CHECK FOR END OF MAP
LDA (MAPPTR),Y
CMP MPTMPA
BNE FNDLP
INY
LDA (MAPPTR),Y
CMP MPTMPA+ 1
BNE FNDLP
LDA MPTMPB;END SO RETURN POINTER
STA MPCYPT
LDA MPTMPB+ 1
STA MPCYPT+ 1
RTS
}
; RETURNS THE SIZE OF A BLOCK OF STORE
;
; ON ENTRY
; MPSCPT POINTS TO BIT MAP
;
; ON EXIT
; MPTMPD HOLDS THE SIZE
;
; USES
; MPTMPE
;
.SIZE
{
LDY #MPSPCY
LDA (MAPPTR),Y
STA TMPSPC
INY
LDA (MAPPTR),Y
STA TMPSPC + 1
LDA #0