Device = 350Port = 36 ;Offset for Drive 0RepPort = 174SigTask = 16Task = 276FindName = -276Track = 20 ;Number of the Tracks to be read Address = $50000 ;The Address from which storage
; starts can only be in Chip-Memory. Here $50000 was selected.
move.l $4,a6 ;get ExecBase lea Name,a1 ;set Pointer to Name lea Device(a6),a0 ;Pointer to Device-List jsr FindName(a6) ;search for Trackdisk-Device tst.l d0 ;Device found ? beq Error ;No, Error move.l Task(a6),a0 ;get Pointer to user Task move.l d0,a6 ;Pointer to Task to A6 move.l Port(a6),a3 ;get Pointer to Drive- ;Port (Drive 0) lea RepPort(a3),a1 ;Pointer to RepPort move.l SigTask(a1),-(a7) ;save Pointer to Task move.l a1,-(a7) ;save Pointer to RepPort move.l a0,SigTask(a1) ;store user Task bset #0,34(a3) ;block Trackdisk-Task ; Starting here is the actual write routine move.l #1,d0 ;Value for Motor on jsr $FEA462 ;switch Motor on move.l #TRACK,D2 ;Track-Number to D2 move.l D2,D0 ;Track-Number to D0 jsr $FEA3DA ;Head positioning lea Address,A5 ;Pointer to Start address of Data to ;transmit to A5
move.l $52(A3),A2 ;Pointer to Write buffer
lea 4(A2),A2 move.w #$FFF,D0 ;erase counter value move.l #$AAAAAAAA,D1 ;Value for erasing L1: move.l D1,(A2)+ ;erase Write buffer dbra D0,L1 ;branch, until done movea.l $52(A3),A2 ;Pointer to Write buffer
lea $680(A2),A2 ;Pointer to beginning of data
moveq #$0B,D4 ;Number of Blocks moveq #0,D5 ;Block counter to NullL2: move.l #$FF000000,D0 ;DOS identification of the Header move.l D5,D1 ;Block number to D1 lsl.l #8,D1 ;shift Number to proper ;position or.l D1,D0 ;store in Header or.l D4,D0 ;store number of blocks to gap move.l D2,D1 ;Track-Number to D1 swap D1 ;Number to proper Position or.l D1,D0 ;enter Track-Number movea.l A2,A1 ;Write buffer to A1 movea.l A5,A0 ;Pointer to Data to A0
jsr $FEAADC ;code Data and shift into
;Write buffer
addq.l #1,D5 ;increment Block counter adda.l #$440,A2 ;Pointer to next Block ;in the Write buffer
adda.l #$200,A5 ;Pointer to next Data subq.l #1,D4 ;decrement number of Blocks
bne.s L2 ;branch, if not finished coding movea.l $52(A3),A0 ;Pointer to Write buffer
lea 4(A0),A0 move.w #$353E,D0 ;Data number for writing jsr $FEA5B4 ;write Track move.l #0,d0 ;Value for Motor off jsr $FEA462 ;switch Motor off ; End of the write routine. The changed ; Pointers must be restored.Ende: bclr #0,34(a3) ;release Task again
move.l (a7)+,a1 ;get Pointer to Task move.l (a7)+,SigTask(a1) ;store in Port againError: rts ;Return jump
