IBM RT Series Hardware Reference Manual page 211

alOO
movax,1102
mov bl,02
intlO
movax,1103
mov bl,08
intlO
movax,lOOO
mov bx,07l2
intlO
movax,130l
mov bx,OOOF
mov cx,003A
mov dx,1600
mov bp,0200
push cs
pop es
intlO
mov ax ,1301
mov bx,0007
mov cx,003A
mov dx,1700
mov bp,0200
push cs
pop es
intlO
int3
a200 db
;load 8x8 character font in character
;generator number 2
; select 512 character operation
;if attribute bit 3 = 1 use 8x8 font
;if attribute bit 3=0 use 9x14 font
;set color plane enable to 7H to disable
;attribute bit 3 in the color palette
;lookup table
;write char. string with attribute bit 3= 1
;cx = character string length
; write character on line 22 of display
;pointer to character string location
;write char. string with attribute bit 3=0
; cx = character string length
; write character on line 23 of display
;pointer to character string location
"This character string is used to show 512
characters' ,
Creating an 80
by
43 Alphanumeric Mode
The following examples show how to create 80 column by 43
row, both alphanumeric and graphics, images on the IBM
Monochrome Display. The BIOS Interface supports an 80
column by n row display by using the character generator load
routine call. The print screen routine must be revectored to
IBM Enhanced Graphics Adapter 71