PT630 Programming Reference Guide
Page 5 of 59
------------------------------------------------------------------------------------------------------------------
Chapter 1. BIOS and System Functions
The PT630 operating system supports DOS/BIOS function calls that a programmer can access when
developing an application for the portable.
1.1
Interrupt Vector Assignment for I/Os
Vector
BIOS Function
09 H
Display Font
0F H
Kermit Server
10 H
LCD Control
21 H
System Functions
22 H
Power Manager
31 H
Beeper Control
33 H
RS232 Control
1.2
Display Font Functions ( INT 09H )
1.2.1 Select Large Font
Entry Parameter: AH = 0
; select 8*16-dot character font (4 lines * 16
; columns display)
Return
Value:
None
void TL_font(int status)
{
regs.h.ah = (unsigned char)status;
int86(0x09,®s,®s);
}
1.2.2 Select Small Font
Entry Parameter: AH = 1
; select 6*8-dot character font (8 lines * 20 columns display)
Return
Value:
None
void TL_font(int status)
{
regs.h.ah = (unsigned char)status;
int86(0x09,®s,®s);
}