Simple Line Repeat Draw Program, DOS 16-bit Line Draw Program using INT 10h

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Treymac

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Joined: 5-March 08

Hey guys. I'm adapting a simple program from my text just to try the concept that I will use in another way. Any ways, what I'm trying to do now is make a line repeat. My book has the program drawing the line once. So here is what I've done.

CODE

MOV AX,0600H ;scroll the screen
MOV BH,07 ;normal attribute
MOV CX,0000 ;from row=00,column=00
MOV DX,184FH ;to row=18H,column=4FH
INT 10H ;invoke interrupt to clear screen

MOV AH,00 ;set mode
MOV AL,06 ;mode = 06 (CGA high resolution)
INT 10H ;invoke interrupt to change mode

MOV CX,100 ;start line at column = 100
MOV DX,50 ;and row = 50

JMP LOC ;jump to LOC

BACK: MOV AH,0CH ;AH=0CH to draw line
MOV AL,01 ;pixels = white
INT 10H ;invoke interrupt to draw a line
INC CX ;increment horizontal position
CMP CX,200 ;draw line until column=200
JNZ BACK ;if not equal, jump to BACK
JMP LOC ;else, jump to LOC

LOC: MOV CX,100 ;set column back to 100
DEC DX ;decrement row
JMP BACK ;jump to back

I think it should work, I have no idea why it doesn't. Can anybody help me out here?
Thanks a lot.


SeaFarer
Extremely Active Member Group: Members Posts: 1753 Member No.: 1464 Joined: 2-September 05	Hi and welcome to the forums! Its been a long time since I did any DOS programming, and just tried looking up the functions with my "PC Programmer's Source Book - 2nd Edition, M$ Press" Are you sure you typed the example in correctly? Have you thought about 32-bit Windows programming yet? Paging Professor Shoorick....


Treymac
New Member Group: Members Posts: 9 Member No.: 5798 Joined: 5-March 08	Hey, thanks for the reply. This is the code that I've modified, but the starting code is correct from the book, I just double checked. We aren't programming in 32-bit yet, were starting off with the real old style of 16 bit registers.

SeaFarer

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Group: Members
Posts: 1753
Member No.: 1464
Joined: 2-September 05

Hehe... starting out in the stone age eh'?

Sure you can't be nudged into 32-bit coding?

It is easier to code with and you can still write DOS style console programs!

Have a look through the examples in the Msm32 package. There are several to choose from to give you ideas and a feel for writing DOS style console applications vs. Windows GUI based apps.

QUOTE

Paging Professsor Shoorick... Please report to the Newbies area. Your expertise with 16-bit linear assembly has been requested....

Here is a quick example I pulled up.

Attached File ( Number of downloads: 23 )


Treymac
New Member Group: Members Posts: 9 Member No.: 5798 Joined: 5-March 08	hah, I just found out my problem. Apparently notepad in windows 98 doesn't have ctrl+s to save, so I wasn't saving my work But that example looks interesting. After my course I'm going to try to get up to date with assembly.

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