0

Sorry for the vague title, I'm trying to move in the 8085 sim the right led from left to right and viceversa. I did it but I realised that the led is moving with "intermitences", is not an instant movement. I want to remove those intermitences.

This is my code:

   MVI A,80
   OUT 00

   DCH: RRC
   OUT 00
   CPI 01
   JZ IZQ
   JMP DCH

   IZQ: RLC
   OUT 00
   CPI 80
   JZ DCH
   JMP IZQ

where DCH is right and IZQ is left

Peter Cordes
  • 328,167
  • 45
  • 605
  • 847
JACK1ETO
  • 15
  • 4

1 Answers1

2

I don't know your simulator but I assume that the simulator simulates an 8-bit latch at I/O port 0 (out 0) with 8 LEDs connected.

You want to implement a bi-directional chase like in this animation in Wikipedia.

If you used a real setup with a real 8085, a real latch and real LEDs your code should work perfectly.

However you would have to use a very, very low CPU frequency in this case. Even when using a CPU frequency of 1 kHz (1/2000 of the nominal frequency) the program would run so fast that you would need a high-speed camera to observe the LEDs.

Martin Rosenau
  • 17,897
  • 3
  • 19
  • 38
  • Can you explain further the bi-directonal chase part? With a code example if possible. Im trying to look that concept up but not success yet. – JACK1ETO Oct 27 '17 at 09:02