Category : Files from Magazines
Archive   : DDJ8611.ZIP
Filename : MCN.NOV

 
Output of file : MCN.NOV contained in archive : DDJ8611.ZIP

Listing 1


Draw a rectangle with an 8086 on CGA.


;
; Draw a rectangle in the upper
; left corner of a CGA display
; in high-resolution mode. The code
; is hardwired to a 10x10 rectangle.
;
;
; Set up segment and offset registers
; to point to display memory.
;
mov AX, 0B800H
mov ES, AX
mov BX, 0
;
; Draw the top line by stuffing one byte
; and the first two bits of the next byte.
;
mov byte ptr [BX], 0FFH
mov byte ptr [BX+1], 0C0H
;
; Draw the bottom line the same way.
;
mov byte ptr [BX+800], 0FFH
mov byte ptr [BX+801], 0C0H

;
; Draw the first and last pixels on the next
; 4 even scan lines, then do the same on the
; odd scan lines.
;
mov SI, 50H
mov CX, 4
EOLoop: mov byte ptr [BX+SI], 80H
mov byte ptr [BX+SI+1], 40H
add SI, 80
loop EOLoop
cmp SI, 2000H
jg EODone
mov SI, 2050H
mov CX, 4
jmp EOLoop
EODone label byte
;
; Rectangle is finished.
;

*************************************************

Same rectangle drawn by 34010


;
; Draw a line from 0,0 to 0,10. The start
; point is in register B2 and the end point
; (delta X and delta Y) is in register B7.
;
; The > sign precedes a 32-bit hex constant.
;
MOVI >0,B2
MOVI >00100000,B7
LINE 0
;
; Repeat the process for the other sides.
;
MOVI >00100000,B2
MOVI >00000010,B7
LINE 0
MOVI >0,B2
MOVI >00000010,B7
LINE 0
MOVI >00000010,B2
MOVI >00100000,B7
LINE 0
;
; Finished!
;

*************************************************


Same rectangle drawn by 82786


;
; Move to the upper left corner and
; draw a 10x10 rectangle.
;
ABS_MOVE 0,0
RECT 10,10
;
; All finished!
;
[EOF]


  3 Responses to “Category : Files from Magazines
Archive   : DDJ8611.ZIP
Filename : MCN.NOV

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/