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*
** FLEX 9 DISK DRIVERS
*
* FOR SYS09BUG ON THE DIGILENT SPARTAN 3 STARTER BOARD
* WITH I/O MAPPED AT $XE000
* AND ROM MAPPED AT $XF000
* THE DIGILENT SPARTAN 3 STARTER BOARD HAS 1MBYTE OF SRAM
* THE FIRST 64K IS USED BY FLEX,
* THE SECOND 128K IS USED AS A ROM DISK
* THE REMAINING RAM IS USED FOR A RAM DISK
*
*
CFLAG   EQU $01     CARRY FLAG
VFLAG   EQU $02     OVERFLOW FLAG
ZFLAG   EQU $04     ZERO FLAG
NFLAG   EQU $08     NEGATIVE FLAG
IFLAG   EQU $10     IRQ MASK CC
HFLAG   EQU $20     HALF CARRY
FFLAG   EQU $40     FIRQ MASK CC
EFLAG   EQU $80     ENTIRE FLAG
*
MAPPAG  EQU $00     PAGE $0000 DAT ADDRESS
*
* Serial Port
*
ACIAS   EQU $E000
ACIAC1  EQU ACIAS
ACIAD1  EQU ACIAS+1
DELCON  EQU 1250    Delay (Processor clock in MHz * 50)
*
* XMODEM Control characters
*
SOH     EQU $01
EOT     EQU $04
ACK     EQU $06
NAK     EQU $15
CAN     EQU $18
*
* Some dummy Constants
*
RMAXTRK EQU 64
RMAXSEC EQU 255
RTOTSEC EQU RMAXTRK*RMAXSEC-RMAXSEC
*
* Start
*
        ORG $0100
START   LBSR  UXSUB
        JMP  [$F800]  Jump to monitor on Completion.
*
*
* RAM SPACE
*
DRVNUM  FCB  0
TRACK   FCB  0
SECTOR  FCB  0
CHKSUM  FCB  0
BLKNUM  FCB  0 Xmodem block number
BYTCNT  FCB  0 Xmodem byte count
XSTATE  FDB  0 Xmodem State Vector
DELCNT  FCB  $00,$00,$00 Xmodem Poll timer
MAXTRK  FCB  0
MAXSEC  FCB  0
        ORG  $0200
*
* SECTOR BUFFER
*
BUFFER  RMB  256
*
*
* recieve char from remote drive.
* timeout if no response for approx 1s.
* Entry: no parameters
* Exit:  (A) = recieved char, (C)=1 if valid char, (C)=0 if timeout.
*
RCHAR   PSHS    X,Y
*
        LDX     #1000         1000x inner loop
RCHAR1  LDY     #DELCON       delay constant for inner loop (approx 1ms).
RCHAR2  LDA     ACIAC1        test for recieved char
        ASRA
        BCS     RCHAR3        get character
        LEAY    -1,Y          else, continue to count delay
        BNE     RCHAR2
        LEAX    -1,X
        BNE     RCHAR1
        PULS    X,Y,PC        return with error if timed out
*
RCHAR3  LDA     ACIAD1        return data (carry bit still set)
        PULS    X,Y,PC
*
*
* transmit char to remote drive.
* timeout if no response for approx 1s. (allows for use of hardware flow control)
* Entry: (A) = char to transmit
* Exit:  (A) = recieved char, (C)=1 if valid char, (C)=0 if timeout.
*
SCHAR   PSHS    X,Y
        PSHS    A
*
        LDX     #1000         1000x inner loop
SCHAR1  LDY     #DELCON       delay constant for inner loop (approx 1ms).
SCHAR2  LDA     ACIAC1        test for space in transmit FIFO
        ASRA
        ASRA
        BCS     SCHAR3        send character
        LEAY    -1,Y          else, continue to count delay
        BNE     SCHAR2
        LEAX    -1,X
        BNE     SCHAR1
        PULS    A
        PULS    X,Y,PC        return with error if timed out
*
SCHAR3  PULS    A
        STA     ACIAD1        send data (carry bit still set)
        PULS    X,Y,PC
*
* Read a byte from the serial port
*
LRBYTE  PSHS B
        BSR  LRHEX                  Get hex digit.
        ASLA
        ASLA                           Shift to msb.
        ASLA
        ASLA
        TFR  A,B                    Save in B.
        BSR  LRHEX                  Get next digit.
        PSHS B
        ADDA 0,S+                    Add together bytes.
        PULS B,PC
*
LRHEX   JSR  INTER
        BVS  LRHEX
        SUBA #$30                   Remove ascii bias.
        BMI  LRHEX
        CMPA #$09                   Number?
        BLE  LRHEX1                 Yes.
        CMPA #$11                   Keep testing.
        BMI  LRHEX
        CMPA #$16
        BGT  LRHEX
        SUBA #$07
LRHEX1  RTS
*
* ACIA INPUT TEST
*
INTEST  LDA ACIAC1
        BITA #$01
        RTS
*
* RESET ACIA
*
ACIRST  LDA #$03 master reset
        STA  ACIAC1
        LDA #$11
        STA ACIAC1
        RTS
*
* ACIA INPUT
*
INTER   LDA  #16
        STA  DELCNT+0
        CLR  DELCNT+1
        CLR  DELCNT+2
INTER0  LDA  ACIAC1
        BITA #$01
        BNE  INTER1
        BITA #$78
        BEQ  INTER2
        BSR  ACIRST
        BRA  INTER
*
INTER1  LDA  ACIAD1
        ANDCC #$FF-VFLAG
        RTS
*
INTER2  DEC  DELCNT+2
        BNE  INTER0
        DEC  DELCNT+1
        BNE  INTER0
        DEC  DELCNT+0
        BNE  INTER0
        CLRA
        ORCC #VFLAG
        RTS
*
* ACIA OUTPUT
*
OUTTER  PSHS A
*
OUTTE1  LDA ACIAC1
        BITA #$02
        BNE  OUTTE2
        BITA #$78
        BEQ  OUTTE1
        BSR  ACIRST
        BRA  OUTTE1
*
OUTTE2  PULS A
        STA ACIAD1
        RTS
*
* Print Data
*
PDATA0  BSR  OUTTER
PDATA1  LDA  ,X+
        CMPA #$04
        BNE  PDATA0
        RTS
*
*
** 'UX' Xmodem ROM Disk upload
*
UXMES0  FCB $0D,$0A
        FCC 'Xmodem ROM Disk Upload'
        FCB 4
UXMES1  FCB $0D,$0A
        FCC 'Upload Complete'
        FCB 4
UXMES2  FCB $0D,$0A
        FCC 'Upload Error'
        FCB 4
UXMSG3  FCB $0D,$0A
        FCC 'Drive Number :'
        FCB 4
UXMSG4  FCB $0D,$0A
        FCC 'Are You Sure ? (Y/N)'
        FCB 4
*
* Print Banner
*
UXSUB   LDX #UXMES0
        LBSR PDATA1
*
* Prompt for Disk drive number (0 to 3)
*
        LDX #UXMSG3
        LBSR PDATA1
UXSUB1  LBSR INTER
        BVS  UXSUB1
        LBSR OUTTER
        CMPA #'0
        LBLO UXEXIT
        CMPA #'3
        LBHI UXEXIT
        SUBA #'0
        STA  DRVNUM
*
* Report selected drive
*
        LDX #UXMSG3
        LBSR PDATA1
        LDA  DRVNUM
        ADDA #'0
        LBSR OUTTER
*
* Ask for confirmation (Y/N)
*
        LDX #UXMSG4
        LBSR PDATA1
UXSUB2  LBSR INTER
        BVS  UXSUB2
        LBSR OUTTER
        ANDA #$5F
        CMPA #'N
        LBEQ UXEXIT
        CMPA #'Y
        BNE  UXSUB
*
* We have confirmation ... now load the disk image
*
        LBSR INITDR
        LDU  #XSTST
        STU  XSTATE
        LDA  #1
        STA  BLKNUM
*
* Sector1
*
        LDX  #BUFFER
*
        CLRA         TRACK 0
        LDB  #$01    SECTOR 1
        STA  TRACK
        STB  SECTOR
*
        LBSR XREAD
        LBCS UXERR
        LBSR XACK
        LBSR XREAD
        LBCS UXERR
*
        LDX  #BUFFER
        LDA  TRACK
        LDB  SECTOR
        LBSR WRITSC
        LBSR XACK
*
* Sector 2
*
        LDX  #BUFFER
*
        LDA  TRACK
        LDB  SECTOR
        INCB
        STA  TRACK
        STB  SECTOR
*
        LBSR XREAD
        LBCS UXERR
        LBSR XACK
        LBSR XREAD
        LBCS UXERR
*
        LDX  #BUFFER
        LDA  TRACK
        LDB  SECTOR
        LBSR WRITSC
*
        LBSR XACK
*
* Sector 3 - SIR
*
        LDX  #BUFFER
*
        LDA  TRACK
        LDB  SECTOR
        INCB
        STA  TRACK
        STB  SECTOR
*
        LBSR XREAD
        LBCS UXERR
        LBSR XACK
        LBSR XREAD
        LBCS UXERR
*
        LDX  #BUFFER
        LDA  38,X
        INCA
        STA  MAXTRK
        LDB  39,X
        INCB
        STB  MAXSEC
        LDA  TRACK
        LDB  SECTOR
        LBSR WRITSC
*
        LBSR XACK
*
* Sector 4 to Last Track & Sector
*
*
        LDA  TRACK
        LDB  SECTOR
        INCB
*
UXLOOP  LDX  #BUFFER
        STA  TRACK
        STB  SECTOR
*
        LBSR XREAD
        LBCS UXERR
        LBSR XACK
        LBSR XREAD
        LBCS UXERR
*
        LDX  #BUFFER
        LDA  TRACK
        LDB  SECTOR
        LBSR WRITSC
        LBSR XACK
*
        LDA  TRACK
        LDB  SECTOR
        INCB
        CMPB MAXSEC
        BNE  UXLOOP
        LDB  #1
        INCA
        CMPA MAXTRK
        BNE  UXLOOP
*
*
*  Write Boot sector
*
        LDX  #$C000
        CLRA         TRACK 0
        LDB  #$01    SECTOR 1
        STA  TRACK
        STB  SECTOR
        LBSR WRITSC
*
UXEXIT  LDX  #UXMES1
        JMP  PDATA1
*
UXERR   LDX  #UXMES2
        LBRA PDATA1
*
* Get a Byte using XModem protocol
* Carry clear => no errors
* Carry set   => errors
*
XREAD   PSHS U
        LDU  XSTATE
*
XBYTE0  LBSR INTER
        BVC  XBYTE1
        LDA  #NAK
        LBSR OUTTER
        LDU  #XSTST
        BRA  XBYTE0
*
XBYTE1  JSR  ,U
        BNE  XBYTE0
        STU  XSTATE
        PULS U,PC
*
* START - LOOK FOR SOH (START OF HEADER) = $01
*
XSTST   CMPA #SOH
        BNE  XSTST1
        LDU  #XSTBL
        ANDCC #$FF-CFLAG-ZFLAG No abort, no valid data (no exit)
        RTS
*
XSTST1  CMPA #EOT
        BNE  XSTST2
        LDA  #ACK
        LBSR OUTTER
        ORCC  #CFLAG+ZFLAG  Set (c)=1 abort & exit
        RTS
*
XSTST2  CMPA #CAN
        BNE  XSTST3
        ORCC  #CFLAG+ZFLAG  Set (c)=1 abort & exit
        RTS
*
XSTST3  ANDCC #$FF-CFLAG-ZFLAG
        RTS
*
* Got SOH
* Now get block number
*
XSTBL   CMPA BLKNUM
        BNE  XSTBLE
        LDU  #XSTCOM
        ANDCC #$FF-CFLAG-ZFLAG No abort, No valid data (no exit)
        RTS
*
* Error in block number
*
XSTBLE  LDA  #NAK
        LBSR OUTTER
        LDU  #XSTST
        ANDCC #$FF-CFLAG-ZFLAG No abort, No valid data (no exit)
        RTS
*
* Get complement of block number
*
XSTCOM  COMA
        CMPA BLKNUM
        BNE  XSTBLE
        CLR  CHKSUM
        LDA  #128
        STA  BYTCNT
        LDU  #XSTDA
        ANDCC #$FF-CFLAG-ZFLAG No abort, No valid data (no exit)
        RTS
*
* Get data bytes
*
XSTDA   PSHS A
        ADDA CHKSUM
        STA  CHKSUM
        PULS A
        DEC  BYTCNT
        BNE  XSTDA1
        LDU  #XSTCK
XSTDA1  STA  ,X+
        ANDCC #$FF-CFLAG-ZFLAG No abort, no valid data (no exit)
        RTS
*
* Byte count reached zero
* Check checksum byte
*
XSTCK   CMPA CHKSUM
        BNE  XSTCK1 retry if wrong checksum
*
* Checksum OK ...
* increment block number
* Don't send ACK until data written to CF
*
        INC  BLKNUM
        LDU  #XSTST
        ANDCC #$FF-CFLAG No abort
        ORCC #ZFLAG      Valid data (exit)
        RTS
*
* Checksum Error detected ...
* Reset Sector counter in ACCB to last 128 byte boundary
* and send NAK
*
XSTCK1  PSHS B
        TFR  X,D
        DECB
        ANDB #128
        TFR  D,X
        PULS B
        LDA  #NAK
XSTCK2  LBSR OUTTER
        LDU  #XSTST
        ANDCC #$FF-CFLAG-ZFLAG No abort, no valid data (no exit)
        RTS
*
* Acknowledge Data Received
*
XACK    PSHS A
        LDA  #ACK
        LBSR OUTTER
        PULS A,PC
*
*
** FLEX 9 IDE DISK DRIVERS
*
* FOR SYS09BUG 1.2 ON THE XSA-3S1000
* WITH I/O MAPPED AT $XE000
* AND ROM MAPPED AT $XF000
*
*
IMASK  EQU $10     IRQ MASK CC
FMASK  EQU $40     FIRQ MASK CC
*
CF_BASE    EQU $E100
CF_DATA    EQU CF_BASE+0
CF_ERROR   EQU CF_BASE+2 ; read error
CF_FEATURE EQU CF_BASE+2 ; write feature
CF_SCNT    EQU CF_BASE+4
CF_SNUM    EQU CF_BASE+6
CF_CLO     EQU CF_BASE+8
CF_CHI     EQU CF_BASE+10
CF_HEAD    EQU CF_BASE+12
CF_STATUS  EQU CF_BASE+14 ; read status
CF_COMAND  EQU CF_BASE+14 ; write command
CF_AUX     EQU CF_BASE+30
*
* Command Equates
*
CMDREAD    EQU $20 ; Read Single sector
CMDWRITE   EQU $30 ; Write Single sector
AUXRESET   EQU $06
AUXRSTREL  EQU $02
HEADLBA    EQU $E0
*
* Status bit equates
*
BSY        EQU $80
DRDY       EQU $40
DRQ        EQU $08
ERR        EQU $01
*
*
* INITIALIZE CF CARD FOR 8 BIT LBA MODE
*
INITDR LDD #AUXRESET
       STD CF_AUX
       LDD #AUXRSTREL
       STD CF_AUX
       LDD  #HEADLBA
       STD  CF_HEAD
       BRA WAITRDY
*
* RESTORE DISK DRIVER (SEEK TRACK 00)
*
RESTR1 BSR   DRVSEL
       CLRA           ; Track 0
       LDB   #$01     ; Sector 1
*
* Seek track and sector
* A holds track number (0 - ??)
* B holds sector number (1 - ??)
* Sector numbers starts from 1
* subtract 1 to start from sector 0 on CF
*
SEEKTS PSHS A
       CLRA
       DECB
       STD  CF_SNUM
       LDB ,S
       STD  CF_CLO
       LDB  DRVNUM
       STD  CF_CHI
       LDB  #$01
       STD  CF_SCNT
       CLRB
       PULS A,PC
*
* READ SECTORS FROM CF
*
*
READSC BSR  SEEKTS
       LDD  #CMDREAD ; IDE READ MULTIPLE
       STD  CF_COMAND
       BSR  WAITRDY
*
* READ LOOP
*
       PSHS Y
       LDY #256
RDLP1  BSR  WAITDRQ
       LDD  CF_DATA
       STB  ,X+
       LEAY -1,Y
       BNE  RDLP1
       PULS Y
*
       BSR  WAITRDY
       CLRB
       RTS
*
* WRITE SECTOR TO CF
*
WRITSC BSR  SEEKTS   ; SEEK TRACK & SECTOR
       LDD  #CMDWRITE ; IDE WRITE MULTIPLE
       STD  CF_COMAND
       BSR  WAITRDY
*
* WRITE LOOP
*
       PSHS Y
       LDY #256
       CLRA
WRTLP1 BSR  WAITDRQ
       LDB  ,X+
       STD  CF_DATA
       LEAY -1,Y
       BNE  WRTLP1
       PULS Y
*
       BSR  WAITRDY
       CLRB
       RTS
*
* CHECK FOR BUSY
* Doubles as VERIFY
*
BUSY   CLRB            Never busy
       RTS
*
* DRIVE SELECT DISK DRIVER
*
DRVSEL LDA   3,X       GET DRIVE # FROM FCB
       CMPA  #3
       BLS   DRVS2     IF > 3, SET IT TO 0
       CLRA
DRVS2  STA   DRVNUM
       CLRB            ; SET Z, CLEAR C
       RTS
*
* CHECK DRIVE READY DISK DRIVER
*
CHKDRV LDA  3,X
       CLRB             ; CLEAR C, SET Z
       RTS
*
* WAIT UNTIL READY
*
WAITRDY LDD  CF_STATUS
        BITB #BSY
        BNE  WAITRDY
        LDD  CF_STATUS
        BITB #DRDY
        BEQ  WAITRDY
        RTS
*
* WAIT FOR DATA REQUEST
*
WAITDRQ LDD  CF_STATUS
        BITB #DRQ
        BEQ  WAITDRQ
        RTS
*
*******************************************************
*
* Bootstrap FLEX Loader
*
* SBUG1.8 loads the bootstap loader at $C000
* however the Flex adaption manual has the
* bootstrap loader residing at $C100
*
******************************************************
*
* Equates
*
STACK   EQU $C0FF
SCTBUF  EQU $C300
*
* Start of Utility
*
        ORG $C000
BOOT    BRA LOAD0
        FCB 0,0,0
TRK     FCB 0        File start track
SCT     FCB 0        File start sector
DNS     FCB 0        Density Flag (not used)
TADR    FDB $C000    Transfer address
LADR    FDB 0        Load Address
DRNUM   FCB 0        Drive number 0
*
LOAD0   LDS  #STACK   Set up stack
        LDD  TRK      Set up start track and sector
        STD  SCTBUF
        LDY  #SCTBUF+256
*
* Perform actual file load
*
LOAD1   BSR GETCH    Get acharcater
        CMPA #$02    Data record hearder ?
        BEQ  LOAD2   Skip, is so
        CMPA #$16    Xfr address hearder ?
        BNE LOAD1    Loop if neither
*
* Get transfer address
*
        BSR  GETCH
        STA  TADR
        BSR  GETCH
        STA  TADR+1
        BRA  LOAD1
*
* Load data record
*
LOAD2  BSR  GETCH  Get load address
       STA  LADR
       BSR  GETCH
       STA  LADR+1
       BSR  GETCH  Get Bytes count
       TFR  A,B
       TSTB
       BEQ  LOAD1 Loop if count = 0
       LDX  LADR  Get load address
LOAD3  PSHS B,X
       BSR  GETCH  Get data character
       PULS B,X
       STA  ,X+    Store at load address
       DECB
       BNE  LOAD3  Loop until count = 0
       BRA  LOAD1
*
* Get Character routine
* Reads a sector if needed
*
GETCH  CMPY #SCTBUF+256 out of data ?
       BNE  GETCH4      Go read Character if not
GETCH2 LDX  #SCTBUF     Point to buffer
       LDD  0,X         Get forward Link
       BEQ  GO          if zero, file is loaded
       BSR  READ        Read next sector
       BNE  BOOT        start over if error
       LDY  #SCTBUF+4   Point past link
GETCH4 LDA  ,Y+         Else, get a character
       RTS
*
* File is loaded, Jump to it
*
GO     JMP  [TADR]      Jump to transfer address
 
*
** FLEX 9 IDE DISK DRIVERS
*
* FOR SYS09BUG 1.2 ON THE XSA-3S1000
* WITH I/O MAPPED AT $XE000
* AND ROM MAPPED AT $XF000
*
*IMASK  EQU $10     IRQ MASK CC
*FMASK  EQU $40     FIRQ MASK CC
*
*CF_BASE    EQU $E100
*CF_DATA    EQU CF_BASE+0
*CF_ERROR   EQU CF_BASE+2 ; read error
*CF_FEATURE EQU CF_BASE+2 ; write feature
*CF_SCNT  EQU CF_BASE+4
*CF_SNUM  EQU CF_BASE+6
*CF_CLO   EQU CF_BASE+8
*CF_CHI   EQU CF_BASE+10
*CF_HEAD    EQU CF_BASE+12
*CF_STATUS  EQU CF_BASE+14 ; read status
*CF_COMAND  EQU CF_BASE+14 ; write command
*CF_AUX     EQU CF_BASE+30
*
* Command Equates
*
*CMDREAD    EQU $20 ; Read Single sector
*CMDWRITE   EQU $30 ; Write Single sector
*HEADLBA    EQU $E0
*AUXRESET   EQU $06
*AUXRSTREL  EQU $02
*
* Status bit equates
*
*BSY        EQU $80
*DRDY       EQU $40
*DRQ        EQU $08
*ERR        EQU $01
*
* Seek track and sector
* A holds track number (0 - ??)
* B holds sector number (1 - ??)
* Sector numbers starts from 1
* subtract 1 to start from sector 0 on CF
*
SEEK   PSHS A
       CLRA
       DECB
       STD  CF_SNUM
       LDB  ,S
       STD  CF_CLO
       LDB  DRNUM
       STD  CF_CHI
       LDB  #$01
       STD  CF_SCNT
       CLRB
       PULS A,PC
*
* READ SECTORS FROM CF
*
*
READ   BSR  SEEK
       LDD  #CMDREAD ; IDE READ MULTIPLE
       STD  CF_COMAND
       BSR  WTRDY
*
* READ LOOP
*
       PSHS Y
       LDY #256
READ1  BSR  WTDRQ
       LDD  CF_DATA
       STB  ,X+
       LEAY -1,Y
       BNE  READ1
       PULS Y
*
       BSR  WTRDY
       CLRB
       RTS
*
* WAIT UNTIL READY
*
WTRDY   LDD  CF_STATUS
        BITB #BSY
        BNE  WTRDY
        LDD  CF_STATUS
        BITB #DRDY
        BEQ  WTRDY
        RTS
*
* WAIT FOR DATA REQUEST
*
WTDRQ   LDD  CF_STATUS
        BITB #DRQ
        BEQ  WTDRQ
        RTS
*
       END START

Line No.	Rev	Author	Line
1	47	davidgb	`*`
2			`** FLEX 9 DISK DRIVERS`
3			`*`
4			`* FOR SYS09BUG ON THE DIGILENT SPARTAN 3 STARTER BOARD`
5			`* WITH I/O MAPPED AT $XE000`
6			`* AND ROM MAPPED AT $XF000`
7			`* THE DIGILENT SPARTAN 3 STARTER BOARD HAS 1MBYTE OF SRAM`
8			`* THE FIRST 64K IS USED BY FLEX,`
9			`* THE SECOND 128K IS USED AS A ROM DISK`
10			`* THE REMAINING RAM IS USED FOR A RAM DISK`
11			`*`
12			`*`
13			`CFLAG EQU $01 CARRY FLAG`
14			`VFLAG EQU $02 OVERFLOW FLAG`
15			`ZFLAG EQU $04 ZERO FLAG`
16			`NFLAG EQU $08 NEGATIVE FLAG`
17			`IFLAG EQU $10 IRQ MASK CC`
18			`HFLAG EQU $20 HALF CARRY`
19			`FFLAG EQU $40 FIRQ MASK CC`
20			`EFLAG EQU $80 ENTIRE FLAG`
21			`*`
22			`MAPPAG EQU $00 PAGE $0000 DAT ADDRESS`
23			`*`
24			`* Serial Port`
25			`*`
26			`ACIAS EQU $E000`
27			`ACIAC1 EQU ACIAS`
28			`ACIAD1 EQU ACIAS+1`
29			`DELCON EQU 1250 Delay (Processor clock in MHz * 50)`
30			`*`
31			`* XMODEM Control characters`
32			`*`
33			`SOH EQU $01`
34			`EOT EQU $04`
35			`ACK EQU $06`
36			`NAK EQU $15`
37			`CAN EQU $18`
38			`*`
39			`* Some dummy Constants`
40			`*`
41			`RMAXTRK EQU 64`
42			`RMAXSEC EQU 255`
43			`RTOTSEC EQU RMAXTRK*RMAXSEC-RMAXSEC`
44			`*`
45			`* Start`
46			`*`
47			`ORG $0100`
48			`START LBSR UXSUB`
49			`JMP [$F800] Jump to monitor on Completion.`
50			`*`
51			`*`
52			`* RAM SPACE`
53			`*`
54			`DRVNUM FCB 0`
55			`TRACK FCB 0`
56			`SECTOR FCB 0`
57			`CHKSUM FCB 0`
58			`BLKNUM FCB 0 Xmodem block number`
59			`BYTCNT FCB 0 Xmodem byte count`
60			`XSTATE FDB 0 Xmodem State Vector`
61			`DELCNT FCB $00,$00,$00 Xmodem Poll timer`
62			`MAXTRK FCB 0`
63			`MAXSEC FCB 0`
64			`ORG $0200`
65			`*`
66			`* SECTOR BUFFER`
67			`*`
68			`BUFFER RMB 256`
69			`*`
70			`*`
71			`* recieve char from remote drive.`
72			`* timeout if no response for approx 1s.`
73			`* Entry: no parameters`
74			`* Exit: (A) = recieved char, (C)=1 if valid char, (C)=0 if timeout.`
75			`*`
76			`RCHAR PSHS X,Y`
77			`*`
78			`LDX #1000 1000x inner loop`
79			`RCHAR1 LDY #DELCON delay constant for inner loop (approx 1ms).`
80			`RCHAR2 LDA ACIAC1 test for recieved char`
81			`ASRA`
82			`BCS RCHAR3 get character`
83			`LEAY -1,Y else, continue to count delay`
84			`BNE RCHAR2`
85			`LEAX -1,X`
86			`BNE RCHAR1`
87			`PULS X,Y,PC return with error if timed out`
88			`*`
89			`RCHAR3 LDA ACIAD1 return data (carry bit still set)`
90			`PULS X,Y,PC`
91			`*`
92			`*`
93			`* transmit char to remote drive.`
94			`* timeout if no response for approx 1s. (allows for use of hardware flow control)`
95			`* Entry: (A) = char to transmit`
96			`* Exit: (A) = recieved char, (C)=1 if valid char, (C)=0 if timeout.`
97			`*`
98			`SCHAR PSHS X,Y`
99			`PSHS A`
100			`*`
101			`LDX #1000 1000x inner loop`
102			`SCHAR1 LDY #DELCON delay constant for inner loop (approx 1ms).`
103			`SCHAR2 LDA ACIAC1 test for space in transmit FIFO`
104			`ASRA`
105			`ASRA`
106			`BCS SCHAR3 send character`
107			`LEAY -1,Y else, continue to count delay`
108			`BNE SCHAR2`
109			`LEAX -1,X`
110			`BNE SCHAR1`
111			`PULS A`
112			`PULS X,Y,PC return with error if timed out`
113			`*`
114			`SCHAR3 PULS A`
115			`STA ACIAD1 send data (carry bit still set)`
116			`PULS X,Y,PC`
117			`*`
118			`* Read a byte from the serial port`
119			`*`
120			`LRBYTE PSHS B`
121			`BSR LRHEX Get hex digit.`
122			`ASLA`
123			`ASLA Shift to msb.`
124			`ASLA`
125			`ASLA`
126			`TFR A,B Save in B.`
127			`BSR LRHEX Get next digit.`
128			`PSHS B`
129			`ADDA 0,S+ Add together bytes.`
130			`PULS B,PC`
131			`*`
132			`LRHEX JSR INTER`
133			`BVS LRHEX`
134			`SUBA #$30 Remove ascii bias.`
135			`BMI LRHEX`
136			`CMPA #$09 Number?`
137			`BLE LRHEX1 Yes.`
138			`CMPA #$11 Keep testing.`
139			`BMI LRHEX`
140			`CMPA #$16`
141			`BGT LRHEX`
142			`SUBA #$07`
143			`LRHEX1 RTS`
144			`*`
145			`* ACIA INPUT TEST`
146			`*`
147			`INTEST LDA ACIAC1`
148			`BITA #$01`
149			`RTS`
150			`*`
151			`* RESET ACIA`
152			`*`
153			`ACIRST LDA #$03 master reset`
154			`STA ACIAC1`
155			`LDA #$11`
156			`STA ACIAC1`
157			`RTS`
158			`*`
159			`* ACIA INPUT`
160			`*`
161			`INTER LDA #16`
162			`STA DELCNT+0`
163			`CLR DELCNT+1`
164			`CLR DELCNT+2`
165			`INTER0 LDA ACIAC1`
166			`BITA #$01`
167			`BNE INTER1`
168			`BITA #$78`
169			`BEQ INTER2`
170			`BSR ACIRST`
171			`BRA INTER`
172			`*`
173			`INTER1 LDA ACIAD1`
174			`ANDCC #$FF-VFLAG`
175			`RTS`
176			`*`
177			`INTER2 DEC DELCNT+2`
178			`BNE INTER0`
179			`DEC DELCNT+1`
180			`BNE INTER0`
181			`DEC DELCNT+0`
182			`BNE INTER0`
183			`CLRA`
184			`ORCC #VFLAG`
185			`RTS`
186			`*`
187			`* ACIA OUTPUT`
188			`*`
189			`OUTTER PSHS A`
190			`*`
191			`OUTTE1 LDA ACIAC1`
192			`BITA #$02`
193			`BNE OUTTE2`
194			`BITA #$78`
195			`BEQ OUTTE1`
196			`BSR ACIRST`
197			`BRA OUTTE1`
198			`*`
199			`OUTTE2 PULS A`
200			`STA ACIAD1`
201			`RTS`
202			`*`
203			`* Print Data`
204			`*`
205			`PDATA0 BSR OUTTER`
206			`PDATA1 LDA ,X+`
207			`CMPA #$04`
208			`BNE PDATA0`
209			`RTS`
210			`*`
211			`*`
212			`** 'UX' Xmodem ROM Disk upload`
213			`*`
214			`UXMES0 FCB $0D,$0A`
215			`FCC 'Xmodem ROM Disk Upload'`
216			`FCB 4`
217			`UXMES1 FCB $0D,$0A`
218			`FCC 'Upload Complete'`
219			`FCB 4`
220			`UXMES2 FCB $0D,$0A`
221			`FCC 'Upload Error'`
222			`FCB 4`
223			`UXMSG3 FCB $0D,$0A`
224			`FCC 'Drive Number :'`
225			`FCB 4`
226			`UXMSG4 FCB $0D,$0A`
227			`FCC 'Are You Sure ? (Y/N)'`
228			`FCB 4`
229			`*`
230			`* Print Banner`
231			`*`
232			`UXSUB LDX #UXMES0`
233			`LBSR PDATA1`
234			`*`
235			`* Prompt for Disk drive number (0 to 3)`
236			`*`
237			`LDX #UXMSG3`
238			`LBSR PDATA1`
239			`UXSUB1 LBSR INTER`
240			`BVS UXSUB1`
241			`LBSR OUTTER`
242			`CMPA #'0`
243			`LBLO UXEXIT`
244			`CMPA #'3`
245			`LBHI UXEXIT`
246			`SUBA #'0`
247			`STA DRVNUM`
248			`*`
249			`* Report selected drive`
250			`*`
251			`LDX #UXMSG3`
252			`LBSR PDATA1`
253			`LDA DRVNUM`
254			`ADDA #'0`
255			`LBSR OUTTER`
256			`*`
257			`* Ask for confirmation (Y/N)`
258			`*`
259			`LDX #UXMSG4`
260			`LBSR PDATA1`
261			`UXSUB2 LBSR INTER`
262			`BVS UXSUB2`
263			`LBSR OUTTER`
264			`ANDA #$5F`
265			`CMPA #'N`
266			`LBEQ UXEXIT`
267			`CMPA #'Y`
268			`BNE UXSUB`
269			`*`
270			`* We have confirmation ... now load the disk image`
271			`*`
272			`LBSR INITDR`
273			`LDU #XSTST`
274			`STU XSTATE`
275			`LDA #1`
276			`STA BLKNUM`
277			`*`
278			`* Sector1`
279			`*`
280			`LDX #BUFFER`
281			`*`
282			`CLRA TRACK 0`
283			`LDB #$01 SECTOR 1`
284			`STA TRACK`
285			`STB SECTOR`
286			`*`
287			`LBSR XREAD`
288			`LBCS UXERR`
289			`LBSR XACK`
290			`LBSR XREAD`
291			`LBCS UXERR`
292			`*`
293			`LDX #BUFFER`
294			`LDA TRACK`
295			`LDB SECTOR`
296			`LBSR WRITSC`
297			`LBSR XACK`
298			`*`
299			`* Sector 2`
300			`*`
301			`LDX #BUFFER`
302			`*`
303			`LDA TRACK`
304			`LDB SECTOR`
305			`INCB`
306			`STA TRACK`
307			`STB SECTOR`
308			`*`
309			`LBSR XREAD`
310			`LBCS UXERR`
311			`LBSR XACK`
312			`LBSR XREAD`
313			`LBCS UXERR`
314			`*`
315			`LDX #BUFFER`
316			`LDA TRACK`
317			`LDB SECTOR`
318			`LBSR WRITSC`
319			`*`
320			`LBSR XACK`
321			`*`
322			`* Sector 3 - SIR`
323			`*`
324			`LDX #BUFFER`
325			`*`
326			`LDA TRACK`
327			`LDB SECTOR`
328			`INCB`
329			`STA TRACK`
330			`STB SECTOR`
331			`*`
332			`LBSR XREAD`
333			`LBCS UXERR`
334			`LBSR XACK`
335			`LBSR XREAD`
336			`LBCS UXERR`
337			`*`
338			`LDX #BUFFER`
339			`LDA 38,X`
340			`INCA`
341			`STA MAXTRK`
342			`LDB 39,X`
343			`INCB`
344			`STB MAXSEC`
345			`LDA TRACK`
346			`LDB SECTOR`
347			`LBSR WRITSC`
348			`*`
349			`LBSR XACK`
350			`*`
351			`* Sector 4 to Last Track & Sector`
352			`*`
353			`*`
354			`LDA TRACK`
355			`LDB SECTOR`
356			`INCB`
357			`*`
358			`UXLOOP LDX #BUFFER`
359			`STA TRACK`
360			`STB SECTOR`
361			`*`
362			`LBSR XREAD`
363			`LBCS UXERR`
364			`LBSR XACK`
365			`LBSR XREAD`
366			`LBCS UXERR`
367			`*`
368			`LDX #BUFFER`
369			`LDA TRACK`
370			`LDB SECTOR`
371			`LBSR WRITSC`
372			`LBSR XACK`
373			`*`
374			`LDA TRACK`
375			`LDB SECTOR`
376			`INCB`
377			`CMPB MAXSEC`
378			`BNE UXLOOP`
379			`LDB #1`
380			`INCA`
381			`CMPA MAXTRK`
382			`BNE UXLOOP`
383			`*`
384			`*`
385			`* Write Boot sector`
386			`*`
387			`LDX #$C000`
388			`CLRA TRACK 0`
389			`LDB #$01 SECTOR 1`
390			`STA TRACK`
391			`STB SECTOR`
392			`LBSR WRITSC`
393			`*`
394			`UXEXIT LDX #UXMES1`
395			`JMP PDATA1`
396			`*`
397			`UXERR LDX #UXMES2`
398			`LBRA PDATA1`
399			`*`
400			`* Get a Byte using XModem protocol`
401			`* Carry clear => no errors`
402			`* Carry set => errors`
403			`*`
404			`XREAD PSHS U`
405			`LDU XSTATE`
406			`*`
407			`XBYTE0 LBSR INTER`
408			`BVC XBYTE1`
409			`LDA #NAK`
410			`LBSR OUTTER`
411			`LDU #XSTST`
412			`BRA XBYTE0`
413			`*`
414			`XBYTE1 JSR ,U`
415			`BNE XBYTE0`
416			`STU XSTATE`
417			`PULS U,PC`
418			`*`
419			`* START - LOOK FOR SOH (START OF HEADER) = $01`
420			`*`
421			`XSTST CMPA #SOH`
422			`BNE XSTST1`
423			`LDU #XSTBL`
424			`ANDCC #$FF-CFLAG-ZFLAG No abort, no valid data (no exit)`
425			`RTS`
426			`*`
427			`XSTST1 CMPA #EOT`
428			`BNE XSTST2`
429			`LDA #ACK`
430			`LBSR OUTTER`
431			`ORCC #CFLAG+ZFLAG Set (c)=1 abort & exit`
432			`RTS`
433			`*`
434			`XSTST2 CMPA #CAN`
435			`BNE XSTST3`
436			`ORCC #CFLAG+ZFLAG Set (c)=1 abort & exit`
437			`RTS`
438			`*`
439			`XSTST3 ANDCC #$FF-CFLAG-ZFLAG`
440			`RTS`
441			`*`
442			`* Got SOH`
443			`* Now get block number`
444			`*`
445			`XSTBL CMPA BLKNUM`
446			`BNE XSTBLE`
447			`LDU #XSTCOM`
448			`ANDCC #$FF-CFLAG-ZFLAG No abort, No valid data (no exit)`
449			`RTS`
450			`*`
451			`* Error in block number`
452			`*`
453			`XSTBLE LDA #NAK`
454			`LBSR OUTTER`
455			`LDU #XSTST`
456			`ANDCC #$FF-CFLAG-ZFLAG No abort, No valid data (no exit)`
457			`RTS`
458			`*`
459			`* Get complement of block number`
460			`*`
461			`XSTCOM COMA`
462			`CMPA BLKNUM`
463			`BNE XSTBLE`
464			`CLR CHKSUM`
465			`LDA #128`
466			`STA BYTCNT`
467			`LDU #XSTDA`
468			`ANDCC #$FF-CFLAG-ZFLAG No abort, No valid data (no exit)`
469			`RTS`
470			`*`
471			`* Get data bytes`
472			`*`
473			`XSTDA PSHS A`
474			`ADDA CHKSUM`
475			`STA CHKSUM`
476			`PULS A`
477			`DEC BYTCNT`
478			`BNE XSTDA1`
479			`LDU #XSTCK`
480			`XSTDA1 STA ,X+`
481			`ANDCC #$FF-CFLAG-ZFLAG No abort, no valid data (no exit)`
482			`RTS`
483			`*`
484			`* Byte count reached zero`
485			`* Check checksum byte`
486			`*`
487			`XSTCK CMPA CHKSUM`
488			`BNE XSTCK1 retry if wrong checksum`
489			`*`
490			`* Checksum OK ...`
491			`* increment block number`
492			`* Don't send ACK until data written to CF`
493			`*`
494			`INC BLKNUM`
495			`LDU #XSTST`
496			`ANDCC #$FF-CFLAG No abort`
497			`ORCC #ZFLAG Valid data (exit)`
498			`RTS`
499			`*`
500			`* Checksum Error detected ...`

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