ted@imsvax.UUCP (Ted Holden) (12/14/86)
At least one poster has asked for info regarding the 43 line capability of the EGA. The following file, taken from the pages of byte, generates ega43.com; you simply run debug via redirection from the script file. N EGA43.COM A 100 MOV AX,1112 ;Load 8x8 font MOV BL,00 INT 10 SUB AX,AX MOV DS,AX PUSH [0487] ;Save INFO byte OR BYTE PTR [0487],01 MOV CX,0600 ;Set cursor size MOV AH,01 INT 10 POP [0487] ;Restore INFO byte MOV DX,03B4 ;Fix up underline MOV AX,0714 OUT DX,AX INT 20 R CX 28 W Q Ted Holden, IMS
vanzandt@uiucdcsp.cs.uiuc.edu (12/15/86)
This doesn't quite make an EGA board switch to 43 lines per screen. It appears that this just "shrinks" the display: the character font is reduced (it is indeed the font in 43 line mode) but the screen starts to scroll up at the old 12th (the new 25th) line. Result is a small copy of the 80x25 screen in the upper left corner... System Used: AT clone with Chips Technology components and a Paradise Systems AutoSwitch EGA board... Lonnie VanZandt @p.cs.uiuc.edu
krausej@uicsrd.CSRD.UIUC.EDU (12/17/86)
> This doesn't quite make an EGA board switch to 43 lines per screen. >It appears that this just "shrinks" the display: the character font is >reduced (it is indeed the font in 43 line mode) but the screen starts to scroll >up at the old 12th (the new 25th) line. Result is a small copy of the 80x25 >screen in the upper left corner... ... >Lonnie VanZandt >@p.cs.uiuc.edu Lonnie, What's most likely happening is that the EGA is truly displaying 43 lines--but the software driving the screen (ANSI.SYS perhaps?) thinks there are 25 lines. I came across this problem when I was trying to get a 50-line CGA display (yes, it is possible...) and discovered I had to mess with some ROM-BIOS variables to make the BIOS routines aware of the 50-line screen. If you're really interested in using your EGA with 43 lines, check out the public domain screen driver NANSI.SYS. It claims to support the 43-line mode (although I can't vouch for that, as I don't have an EGA). There are other programs that do that same, such as Hersey Micro Consulting's FANSI-CONSOLE (shareware, $75 for full registration). There may also be a way to tell the EGA BIOS to use 43 lines, but I'm not aware of that. Good luck! James Krause