138 lines
3.6 KiB
ArmAsm
Executable File
138 lines
3.6 KiB
ArmAsm
Executable File
********************************
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* Integer conversion routines. *
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* Uses: IO *
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* IO.MAC *
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* MATH *
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********************************
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* External references
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; jewel.of.kaldun.s
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DATA EXT
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********************************
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* CONVERT converts a hex byte *
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* to decimal and prints it in *
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* the form: XXX. *
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* I.E. $10 = 016 *
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********************************
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CONVERT LDA #"0"
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LDY #3
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:0 STA CONVSTR-1,Y
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DEY
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BNE :0
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LDA (PTR),Y
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:1 CMP #100
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BLT :2
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SBC #100
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INC CONVSTR
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JMP :1
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:2 CMP #10
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BLT :3
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SBC #10
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INC CONVSTR+1
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JMP :2
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:3 CMP #1
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BLT :DONE
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SBC #1
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INC CONVSTR+2
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JMP :3
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:DONE LDY #0 ; kill leading zeros
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:LOOP LDA CONVSTR,Y
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CMP #"0"
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BNE :JUSTIFY
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INY
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CPY #2 ; check only 1st two 0's
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BLT :LOOP
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:JUSTIFY CPY #0 ; Y contains how many 0's
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BEQ :PRINTIT ; to "zap"
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:JBEGIN LDX #0 ; the Jloop shifts data left
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:JLOOP LDA CONVSTR+1,X
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STA CONVSTR,X
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INX
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CPX #3
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BLT :JLOOP
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DEY
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BNE :JBEGIN
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:PRINTIT LDA DATA ; call output routine to
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PHA ; print number string.
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LDA DATA+1
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PHA
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PRINT CONVSTR
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PLA
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STA DATA+1
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PLA
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STA DATA
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RTS
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CONVSTR ASC "999"00
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********************************
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* Converts a hex word into a *
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* printable string. *
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* I.E. $FFFF = 65535 *
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* $0000 = 00000 *
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********************************
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CONVWORD LDY #5
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LDA #"0"
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:0 STA CWSTR-1,Y
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DEY
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BNE :0
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LDX #0
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:AGAIN LDY #0
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:LOOP LDA (PTR),Y
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STA NUM1,Y
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LDA NUMBERS,X
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STA NUM2,Y
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INX
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INY
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CPY #2
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BLT :LOOP
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STX XTEMP
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JSR IDIV
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LDX XTEMP
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LDA #<NUM1
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STA PTR
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LDA #>NUM1
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STA PTR+1
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TXA
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LSR
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TAY
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LDA RESULT
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CLC
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ADC CWSTR-1,Y
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STA CWSTR-1,Y
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CPX #10
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BLT :AGAIN
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:KILL LDY #0 ; kill leading zeros
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:KILLOOP LDA CWSTR,Y
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CMP #"0"
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BNE :JUSTIFY
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INY
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CPY #4 ; check 1st 4 zeros
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BLT :KILLOOP
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:JUSTIFY CPY #0 ; Y contains how many 0's
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BEQ :PRINTIT ; to "zap"
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:JBEGIN LDX #0 ; the Jloop shifts data left
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:JLOOP LDA CWSTR+1,X
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STA CWSTR,X
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INX
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CPX #5
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BLT :JLOOP
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DEY ; check if another leading 0
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BNE :JBEGIN ; must be killed.
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:PRINTIT LDA DATA ; call output routine to
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PHA ; print number string.
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LDA DATA+1
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PHA
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PRINT CWSTR
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PLA
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STA DATA+1
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PLA
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STA DATA
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RTS
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CWSTR ASC "99999"00
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NUMBERS DA 10000,1000,100,10,1
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