Help with assembly language program

[NexusVoid]

So i'm doing a technical thesis project which controls dampers of a HVAC unit according to the amount of people inside a building.. I have a circuit designed that will increment when a person enters a building and decrement when someone leaves. This is where my trouble is. These voltages go into a comparator and latch circuit which outputs a number to an 8255 PPI Interface card. The program should then output in order to move a motor on one way or the other to open or close a damper. I have very little skills in assembly language programming and just know the bare basics. Any help on this program would be greatly appretiated. This is what I have so far..

A100
MOV AL,90
MOV DX,303
OUT DX,AL

 

[Wond3rboy]

Hi you need to atleast give a rough diagram showing the lines(address,data and the signals) of the PPI and the up that way one could help. Which up are you using anyways?Also the OUT instruction is a 2 byte instruction while you seem to have used 3 bytes!

Also first you need to initialize the device for e.g port setting interrrupt enable/disable....

 

[NexusVoid]

Little change in plans. I think I may now actually use a PIC instead of the 8255 PPI because the PIC can accept an analog input which makes life a lil easier for me. Although the same problem persists with the programming. Not exactly sure how or where to start with the code.

 

[Wond3rboy]

Which PIC are you talking about? the 8259a? or using PIc microcontrollers and changing everything altogather? Also PIC and PPI are two different things. One is a parallel data transfer device and the other is an interrupt controller.