My program uses 4000 bytes at segment 0xb800 for text mode display. The bottom 3 lines of the screen (160 bytes of memory per line) are static display and are not to be moved. Bytes 0 thru 3519 contain part of a text document and are the area to be moved up/down.
1. The code below moves the displayed document text up one line. It works fine:
mov ax,0xb800
mov ds,ax
mov es,ax
mov cx,1680
mov si,160
mov di,0
rep movsw
2. I tried the code below to move the displayed document text DOWN one line:
mov ax,0xb800
mov ds,ax
mov es,ax
mov cx,1680
mov si,3200
mov di,3360
rep movsw
It moves the line beginning at b800:3200 down one line on the screen but the lines above it are not moved down. It is unfortunate that the static display gets overwritten, I can handle that later. I tried some variations of the code but I wasn't able to get the entire document area to move down one line. Can someone here tell me how to move the document area down one line.
TIA. Bill S.
