Password generator: Difference between revisions

=={{header|6502 Assembly}}==

Unfortunately, easy6502 cannot display text, but it does have a random number generator, so this example merely contains the logic for generating the password itself. The screen can only display colored pixels, and the top 4 bytes are masked off, so this is just a visual aid to show the process in action. The X register is loaded with the password's length (in this case, 20 characters, not counting the null terminator.)

<lang 6502asm>LDY #0

LDX #20

LOOP:

LDA $FE ;load a random byte

BMI LOOP ;IF GREATER THAN 7F, ROLL AGAIN

CMP #$21 ;ASCII CODE FOR !

BCC LOOP

CMP #$5C

BEQ LOOP ;NO \

CMP #$60

BEQ LOOP ;NO `

;else, must be a good character

STA $0200,Y

INY

DEX

BNE LOOP

BRK ;end program</lang>