Question

Can someone please help me with this problem? We are using CodeWarrior to write this program in assembly language.

The array sample contains eight 8-bit signed binary numbers (integers) as shown below. Write a program which stores the negative numbers in the array nelements, computes the sum of the positive numbens to be stored in the variable psum and stores the number of the positive numbers in the variable pnumber. Note that a zero is ther positive nor negative. Your program must use a single loop. Your program should work for any 8 numbers stored in samples. RAMStart S0800 and ROMStart $4000. samples DC.B S90,S55 $A0,$00, $20.SCC, $88,S77 nelements DS.B 8 DSB psum pnumber DS.B 1 Assemble the program and execute it in the single-step mode with the contents of the array and variables displayed in the memory window. Do screen-captures (the source, memory and register windows) right before the first instruction is executed, right after the 4th number is processed, and right after the last instruction except rts is executed. Submit the list file of your code with the 3 sets of screen-captures attached.

Answer 1

; export symbols XDEF Start XREF SEG END SSTACK;symbol defined elsewhere MyRAM: SECTION Sum: ; section for data in RAM ; put the sum value here DS.B 1 MyCode: SECTION Start: LDS # SEG END SSTACK ; Initialize SP ; section for code LDAA #$1A ADDA Val2 STAA Sum ; get a valuee ; add to another ; store the sum Done: BRA Done ; all done for now MyCnst: SECTION Va 12 : DC . B $23 ; end of example program ; section for constant data ; a constant value

XDEF Start ABSENTRY Start required for absolute assembly : export symbols ORG $0900 DS. B 1 ; section for data in RAM : put the sum value here Sum: ORG $4000 ; section for code, constants Start: LDS #$0900 ; initialize the stack pointer LDAA #$1A ADDA Val2 STAA Sum : get a value ; add to another ; store the sum DoneBRA Done Va 12 : DC . B $23 ; all done for now ; a constant value ORG ŞFFFE DC.W Start ; section for a constant ; Reset Vector

ORG $0900 DS. B 1 ; section for data in RAM ; put the sum value here 0900 ?? Sum: ORG $4000 ; section for code, constants 4000 . .. . Start : LDS #$0900 ; initialize stack pointer LDAA #$1A ADDA Val2 STAA Sum ; get a value ; add to another ; store the sum DoneBRA Done Val2: ; all done for now ; a constant value DC. B $23 ORG ŞFFFE DC.W Start ; section for a constant ; Reset Vector FFFE 40 00

ntern ORG $0900 DS.B 1 ; section for data in RAM : put the sum value here 0900 ? Sum: ORG $4000 ; section for code, constants 4000 CF 09 00 Start : LDS #$0900 ; initialize stack pointer 4003 86 1A 4005 BB 40 OD 4008 7A 09 00 LDAA #$1A ADDA Va12 STAA Sum : get a value ; add to another ; store the sum 400B 20 FE 400D 23 Done: BRA Done Va12: DC . В $23 ; all done for now ; a constant value ORG ŞFFFE DC.W Start ; section for a constant ; Reset Vector FFFE 40 00