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base:8_bit_to_hexadecimal_conversion

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base:8_bit_to_hexadecimal_conversion [2017-08-20 00:05] – fixed slight bug tww_ctrbase:8_bit_to_hexadecimal_conversion [2017-08-20 00:17] – tww_ctr
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 ;************************** ;**************************
 OUTHEX tax ; save value for low nibble OUTHEX tax ; save value for low nibble
- and #$f0 ; High nibble +        lsr             ; ignore CARRY and shift hi nybble to lonybble pos.
-        lsr             ; ignore CARRY!+
  lsr ;   lsr ; 
  lsr ;   lsr ; 
Line 68: Line 67:
  jsr NIB2HEX ; print nibble  jsr NIB2HEX ; print nibble
  rts  rts
- 
  
 ;********************* ;*********************
Line 77: Line 75:
         adc #$30 ; Accu < 10         adc #$30 ; Accu < 10
  jmp BSOUT       ; Print #$30 - #39  jmp BSOUT       ; Print #$30 - #39
-HEX sbc #$09 ; Accu >= 10, subtract #$09 to get "A" to "F"+HEX adc #$36 ; Accu >= 10, subtract #$09 to get "A" to "F" (CARRY always set here)
  jmp BSOUT ; Print Accu (HEX nibble) and bye  jmp BSOUT ; Print Accu (HEX nibble) and bye
 </code> </code>
  
-Alternatively, add #$36 (CARRY is set, so effectively becomes #$37) to get upper case characters in lower case mode. Also you can "branch always" after adding #$30 to OUT to save a byte at the expense of 3 cycles. 
base/8_bit_to_hexadecimal_conversion.txt · Last modified: 2017-08-20 00:30 by tww_ctr