So I'm taking Digital Systems and we're learning assembly. Last week, all I had to do was look at an asm and give some locations...this week, I need to "write a program which performs addition of the nine numbers and stores the result into a memory location. The nine numbers are given in decimal: 3,-5,13,24,11,25,36,2,8." We're using Wookie, and the program starts at $C000 and the data array starts at $0010. For a basic algorithm I know that I need to initialize, read the first number, start a loop, add number to location, read next number, end loop, and store the final number. However, I have NO IDEA how to go about implementing this into a program. Can anyone help?
Posted on 2008-09-22 17:18:14 by poketnrjsh
So far, here's what I have: am I even close to right?
* Date: 9/22/2008
* Description: This program loads 9 numbers, computes the sum and stores
*              the result in memory.
* Pseudocode:
* begin
* Read the first values of array
* Store in Accumulator A
* Loop Read the next values of array
* add to store
* increment counter
* end loop
* if counter = 0
* then go to end
* else repeat the loop
* end
        ORG  $0010
DATA1  FCB  3,-5,13,24,11,25,36,2,8
DATA2  RMB  10

        ORG  $C000
        LDAB #9          Initialize the COUNTER
        STAB COUNTER    by placing 9 into COUNTER
        LDAA #DATA1      Initialize the index register
LOOP    LDAA 0,X        Loading from DATA1
        DECB            Decrement the element
        INX              Increment DATA1 pointer
        DEC  COUNTER    Have all elements been handled?
        BNE  LOOP        If not repeat LOOP
        SWI              If so exit LOOP
Posted on 2008-09-23 16:55:36 by poketnrjsh
lol, looks pretty close to me, and I've never coded on that cpu.
But I did code on the 6502 and 6510, which used $C000 for user space! (and very similar opcodes).
Posted on 2008-09-24 07:21:34 by Homer

But I did code on the 6502 and 6510, which used $C000 for user space! (and very similar opcodes).

The old VIC-20, Commodore64 series? I've taught myself assembly on those machines way back when...
Posted on 2008-10-14 20:36:34 by rags