Maybe one of the members can give me help with program?
It runs pseudo random generator but not very well.

I took this out of one my books on 8051 microcontrollers.
I also ran it on simulator it runs with out errors but pseudo random generator part is really bad.

89c2051 running at 4 Mhz
power at 5v source

P1.0---7 connected to leds
P3.0---7 connected to leds

program should not repeat for about 4 hours

;Mainline

org 0 ;execution starts here
loop: ;loop here forever
mov c,p3.2;get the bits to and together
cpl psw.7;invert bit 13
anl c,p3.7;and it with bit 15
mov acc.0,c ;save it for later
mov c,p3.7;now get bit 13 * ! bit 15
cpl psw.7
anl c,p3.2
orl c,acc.0;orboth values together in carry
mov a,p1;now update the 16 led display
rlc a
mov p1,a
mov a,p3
rlc a
mov p3,a
acall dlay;leave like this for 500 msec
sjmp loop;loop around again
dlay: ;delay 263 msec
clr a
mov b,#0 ;longest delay possible
dlayloop: loop here for 500 msec
djnz acc,dlay loop ;inside loop
djnz b,dlayloop
ret


This should light 16 leds in pseudo random pattern. But I run on
simulator it looks like it know where near pseudo random pattern.


Best reguards,


Ralph Sack