;Program to copy an array of data from one block of memory to another .
;Add decimal 14 to the value of each word before storing in the destination array.
;Keep copying until the program reaches a zero value in the source array.
.ORIG x3000 ;Program starts at address hex 3000
LD R0, SRC ;(Changed) from LEA to LD Load address of SRC into Register 0
LD R1, DEST ;Load contents of memory address DEST into Register 1
LOOP LDR R2, R0, #0 ;Load contents of memory location whose address is in R0 into R2
BRZ DONE ;(Changed) from SRC to DONE If last operation was zero, branch to end
ADD R2, R2, #14 ;Add decimal 14 to value in R2
STR R2, R1, #0 ;Store contents of R2 into memory whose address is in R1
ADD R0, R0, #1 ;Add 1 to R0
ADD R1, R1, #1 ;Add 1 to R1
BR LOOP ;(Changed) from BRN to BR regardless of the condition it branches to LOOP
DONE TRAP x25 ;Trap to HALT the program.
SRC .FILL x4000 ;Address of start of source data array
DEST .FILL x5000 ;Address of start of destination array.
.END
質問
誰かがこのプログラムを手伝ってくれますか?それはX4000から始まる数字に14を追加し、X5000から始まる新しい数字を保存することになっています。 LC-3を使用し始めたばかりですが、実際にコードすることをまだ学んでいません。このコードには3つのエラーしかありませんが、何を修正すべきかわかりません。
;Program to copy an array of data from one block of memory to another .
;Add decimal 14 to the value of each word before storing in the destination array.
;Keep copying until the program reaches a zero value in the source array.
.ORIG x3000 ;Program starts at address hex 3000
LEA R0, SRC ;Load address of SRC into Register 0
LD R1, DEST ;Load contents of memory address DEST into Register 1
LOOP LDR R2, R0, #0 ;Load contents of memory location whose address is in R0 into R2
BRZ SRC ;If last operation was zero, branch to end
ADD R2, R2, #14 ;Add decimal 14 to value in R2
STR R2, R1, #0 ;Store contents of R2 into memory whose address is in R1
ADD R0, R0, #1 ;Add 1 to R0
ADD R1, R1, #1 ;Add 1 to R1
BRN LOOP ;If last operation was negative, branch to LOOP
DONE TRAP x25 ;Trap to HALT the program.
SRC .FILL x4000 ;Address of start of source data array
DEST .FILL x5000 ;Address of start of destination array.
.END
解決
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