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Commodore 1571 firmware
Format/Verify Routine

        .page
	.subttl 'lccfmt3.src'      
;
;
;
;*   format done, now verify it
;
;
;
        lda  #200       ;  look at 200 syncs
        sta  trys        
;
comp    lda  #0         ;  pointer into headers
        sta  bufpnt      
;
        lda  #>buff0     
        sta  bufpnt+1    
;
        lda  sectr      ;  sector counter
        sta  sect        
;
cmpr10  jsr  sync       ;  find sync
;
        ldx  #10         
        ldy  #0          
;
cmpr15  bvc  *          ;  get header byte
        clv      
;
        lda  data2       
        cmp  (bufpnt),y ;  compare gcr
;
        bne  cmpr20     ; error
;
        iny      
        dex      
        bne  cmpr15     ;  test all bytes
;
        clc     	;  update headr pointer
        lda  bufpnt      
        adc  #10         
        sta  bufpnt      
;
        jmp  tstdat     ;  now test data
;
cmpr20  dec  trys       ;  test if too many errors
        bne  comp        
;
        lda  #notfnd    ;  too many error
        jmp  fmterr      
;
tstdat  jsr  sync       ;  find data sync
;
        ldy  #256-topwrt         
;
tst05   bvc  *   
        clv      
;
        lda  data2      ;  compare gcr
        cmp  ovrbuf,y    
;
        bne  cmpr20     ;  error
;
        iny      
        bne  tst05      ;  do all ovrbuf
;
        ldx  #255-3     ;  now do buffer, dont test off bytes
;
tst10   bvc  *   
        clv      
;
        lda  data2       
        cmp  buff2,y     
        bne  cmpr20      
;
        iny      
        dex      
        bne  tst10       
;
;
        dec  sect       ;  more sectors to test?
        bne  cmpr10     ;  yes
;
;
;  all sectors done ok
;
        inc  ftnum      ;  goto next track
        lda  ftnum       
        cmp  #36        ;  #tracks max
        bcs  fmtend      
;
        jmp  end        ;  more to do
;
;
fmtend  lda  #$ff       ;  clear ftnum
        sta  ftnum       
;
        lda  #$0        ;  clear gcr buffer flag
        sta  gcrflg      
;
        lda  #1         ;  return ok code
        jmp  errr        
;
;
;
;.end


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This page has been created by Sami Rautiainen.
Read the small print. Last updated March 24, 1998.