SECTION 6
Conversions and Interfaces
6-52 PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide
INT 10h, Function AH = 12h, BL = 0FFh: Backlight Off/On
4000API
Specific to NORAND computers, may not be PC compatible.
Issued by the keyboard interrupt handler when the backlight key is pressed. If
the light is active, it is deactivated. If it is inactive, it is activated.
On Entry:
AH = 12h
BL = 0FFh
AL = Request type:
0 = Activate backlight
1 = Turn light off
2 = Toggle the backlight
On Return:
None
Programmable Font Support
INT 10h, Function AX = 1400h: Load User Font
FONTMAP
The font file must be in the following format:
xsize
byte Number of font pixels in x direction
ysize
byte Number of font pixels in y direction
font [(xsize+7)/8, ysize]
byte The actual bitmap font
The largest bitmapped font that can be supported is 8 KB.
On Entry:
AH = 14h
AL = 00h
BL = Request type
Bit 000h = Load main font
Bit 0FFh = Load entire 16Ćline display font
DX = First character value to be programmed
CX = Number of characters to be programmed
BH = Number of bytes per character (8 or 16)
ES:DI = Pointer to font bit map
On Return:
None
INT 10h, Function AX = 1401h, BL = 00h: Load System Default Font
FONTMAP
On Entry:
AH = 14h
AL = 01h
BL = 00h: Load main font
On Return:
None
6. Conversions and
Interfaces
