prompt :
Create Z80 Assembly code to add 3 ten times
(Actually, prompted in Japanese and translated the response in English)
Response by ChatGPT 3.5
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Sure, here's the program in Z80 assembly language that adds 3 to itself 10 times:
.org 0000h
start:
LD A, 0 ; Initialize register A to 0
LD B, 10 ; Load 10 into register B
loop:
ADD A, 3 ; Add 3 to register A
DJNZ loop ; Decrement B; if not zero, jump back to loop
; Add any necessary program termination here (optional)
HALT ; End the program
.end
This program adds 3 to itself 10 times and stores the result in register A.
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Response by Google Gemini
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Code snippet
; Initialize variables
LD A, 03 ; Load value 3 into register A
LD HL, 0000 ; Load value 0000 into HL register (counter)
; Start the loop
loop:
ADD A, A ; Add A to itself (increment A by 1)
DCR HL ; Decrement HL register (count down)
JNZ loop ; Jump to 'loop' if HL is not zero (counter > 0)
; End of loop
HALT ; Halt execution
; Output the result
LD B, A ; Load value from A to register B
OUT (0x01), B ; Output value from B to port 0x01 (display on screen)
Explanation:
Initialize variables:
LD A, 03: Loads the value 3 into register A.
LD HL, 0000: Loads the value 0000 into the HL register, which will be used as a counter.
Start the loop:
loop:: This label marks the beginning of the loop.
Increment the sum:
ADD A, A: Adds the value in register A to itself, effectively incrementing A by 1.
Decrement the counter:
DCR HL: Decrements the value in the HL register by 1.
Check if the loop continues:
JNZ loop: Jumps back to the loop label if the value in HL is not zero (counter > 0). This means the loop will continue until the counter reaches zero.
End of the loop:
HALT: Halts the execution of the program.
Output the result:
LD B, A: Loads the value from register A into register B.
OUT (0x01), B: Outputs the value from register B to port 0x01, which is typically connected to a display device. This will display the final sum on the screen.
This code effectively adds the value 3 to itself ten times, storing the result in register A and displaying it on the screen.
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Response by Microsoft Copilot
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Of course. Below is a program using Z80 assembly language that adds 3 ten times. This program uses the B register as a counter and stores the result in the HL register pair.
Assembly
LD B, 10 ; Load 10 into the B register (used as a counter)
LD HL, 0 ; Initialize the HL register pair to 0
AddLoop:
ADD HL, DE ; Add the value in the DE register pair (3) to HL
DJNZ AddLoop ; Decrement the value in the B register, if not zero, loop back to AddLoop
RET ; End of the program
Before running this program, you need to load 3 into the DE register pair. For example, you can do this with LD DE, 3. After the program finishes, the HL register pair will contain the result of adding 3 ten times. Please give it a try! 👩💻"
I hope this helps clarify the program for you! If you have any more questions or need further assistance, feel free to ask. 😊
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Create Z80 Assembly code to add 3 ten times
(Actually, prompted in Japanese and translated the response in English)
Response by ChatGPT 3.5
--------
Sure, here's the program in Z80 assembly language that adds 3 to itself 10 times:
.org 0000h
start:
LD A, 0 ; Initialize register A to 0
LD B, 10 ; Load 10 into register B
loop:
ADD A, 3 ; Add 3 to register A
DJNZ loop ; Decrement B; if not zero, jump back to loop
; Add any necessary program termination here (optional)
HALT ; End the program
.end
This program adds 3 to itself 10 times and stores the result in register A.
--------
Response by Google Gemini
--------
Code snippet
; Initialize variables
LD A, 03 ; Load value 3 into register A
LD HL, 0000 ; Load value 0000 into HL register (counter)
; Start the loop
loop:
ADD A, A ; Add A to itself (increment A by 1)
DCR HL ; Decrement HL register (count down)
JNZ loop ; Jump to 'loop' if HL is not zero (counter > 0)
; End of loop
HALT ; Halt execution
; Output the result
LD B, A ; Load value from A to register B
OUT (0x01), B ; Output value from B to port 0x01 (display on screen)
Explanation:
Initialize variables:
LD A, 03: Loads the value 3 into register A.
LD HL, 0000: Loads the value 0000 into the HL register, which will be used as a counter.
Start the loop:
loop:: This label marks the beginning of the loop.
Increment the sum:
ADD A, A: Adds the value in register A to itself, effectively incrementing A by 1.
Decrement the counter:
DCR HL: Decrements the value in the HL register by 1.
Check if the loop continues:
JNZ loop: Jumps back to the loop label if the value in HL is not zero (counter > 0). This means the loop will continue until the counter reaches zero.
End of the loop:
HALT: Halts the execution of the program.
Output the result:
LD B, A: Loads the value from register A into register B.
OUT (0x01), B: Outputs the value from register B to port 0x01, which is typically connected to a display device. This will display the final sum on the screen.
This code effectively adds the value 3 to itself ten times, storing the result in register A and displaying it on the screen.
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Response by Microsoft Copilot
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Of course. Below is a program using Z80 assembly language that adds 3 ten times. This program uses the B register as a counter and stores the result in the HL register pair.
Assembly
LD B, 10 ; Load 10 into the B register (used as a counter)
LD HL, 0 ; Initialize the HL register pair to 0
AddLoop:
ADD HL, DE ; Add the value in the DE register pair (3) to HL
DJNZ AddLoop ; Decrement the value in the B register, if not zero, loop back to AddLoop
RET ; End of the program
Before running this program, you need to load 3 into the DE register pair. For example, you can do this with LD DE, 3. After the program finishes, the HL register pair will contain the result of adding 3 ten times. Please give it a try! 👩💻"
I hope this helps clarify the program for you! If you have any more questions or need further assistance, feel free to ask. 😊
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Picture of Z80 CPU created with Microsoft Designer
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Note:
Code by Google Gemini contains error. HL register should load 10 (or &h000A).
The main CPU of the picture is not Z80, but the Chip upper-right of the main CPU looks like Z80.
日本語版はこちら
https://blog.kuma-farm-japan.jp/