Check-sum using xor ^

L_Gaminde

I am trying to make a list of check-sum values the code below works great but how do I get A through F into the variable a after it runs through 1 through 9


' {$STAMP BS2}
' {$PBASIC 2.5}
a VAR Word
b VAR Word
z VAR Word
start:
FOR a = 48 TO 57
FOR b = 48 TO 57
z = 59 ^a ^b ^78
DEBUG a,b," ",a,b,"N",HEX z,CR
PAUSE 500
NEXT

FOR b = 65 TO 70
z = 59 ^48 ^b ^78
DEBUG a,b," ",a,b,"N",HEX z, CR
PAUSE 500
NEXT
NEXT

END

L_Gaminde

Well this is what I came up with!
' {$STAMP BS2}
' {$PBASIC 2.5}
a VAR Word
b VAR Word
z VAR Word

start:
FOR a = 48 TO 57
FOR b = 48 TO 57
z = 59 ^a ^b ^78
DEBUG a,b," ",a,b,"N",HEX z,CR
PAUSE 500
NEXT

FOR b = 65 TO 70
z = 59 ^48 ^b ^78
DEBUG a,b," ",a,b,"N",HEX z, CR
PAUSE 500
NEXT
NEXT

FOR a = 65 TO 70
FOR b = 48 TO 57
z = 59 ^a ^b ^78
DEBUG a,b," ",a,b,"N",HEX z,CR
PAUSE 500
NEXT

FOR b = 65 TO 70
z = 59 ^48 ^b ^78
DEBUG a,b," ",a,b,"N",HEX z, CR
PAUSE 500
NEXT
NEXT


END

Tracy Allen

Larry, not sure if this does what you want. It runs the a and b variables from 48 to 63, but translates the values from 58 to 63 up to "A" to "F".

[SIZE=1][FONT=courier new]a VAR BYTE
x VAR BYTE
b VAR BYTE
y VAR BYTE
z VAR WORD
FOR a=48 TO 63
  IF a>57 THEN x=a+7
  FOR b=48 TO 63
    IF b>57 THEN y=b+7
    z = 59 ^ x ^ y ^ 78
    DEBUG x,y," ",x,y,"N",HEX z,CR
    PAUSE 500
  NEXT
NEXT
[/FONT][/SIZE]

The bitwise xor operation is commutative, so I think you can replace the 59^78 with one ^117.

L_Gaminde

Yes i think this is what i wanted, i changed the x and y to a and b so it would print out from 00 to FF
thanks Tracy I think this is the first thing you posted for me that I did not have to look at for a few hours to understand. after 10 years I'm still trying to figure out your Julian stuff.

SO is there a way to print out the Debug list?

' {$STAMP BS2}
' {$PBASIC 2.5}
a VAR Byte
x VAR Byte
b VAR Byte
y VAR Byte
z VAR Word
FOR a = 48 TO 63
IF a > 57 THEN a = a + 7
FOR b = 48 TO 63
IF b > 57 THEN b = b + 7
z = 59 ^ a ^ b ^ 78
DEBUG a,b," ",a,b,"N",HEX2 z,CR
PAUSE 100
NEXT
NEXT

Tracy Allen

Hmmm. I'd think that adding 7 to the actual loop variable would mess up the loop execution. That's why I threw in x and y.

The value of z is the only one being printed out as 00 to FF.

Print out the debug list--Capture the list using a terminal program, Putty, CoolTerm, Hyperterminal etc. Then print the text file.

(Ah, Julian time is quite a numbers game!)

L_Gaminde

yea ok I lied! it is going to take some time
yours starts at AA and goes to FF but skips the lower set 00 to 9F because of the X-Y in the debug statement so I need to implement you thinking into something a little different.