Unitech PT600, Programming Reference Manual, Page: 19 / 77

Example :
void TD_beeper_vol(int status)
{
regs.h.ah= 0x1A;
regs.h.bh= 3;
regs.h.al= (unsigned char)status;
int86(0x21,&regs,&regs);
}
1A Enable/Disable RS232 Port
Entry Parameter: AH = 1AH
BH = 4
AL = 0/1 ; disable/enable
Return Value: None
Example :
void TD_serial(int status)
{
regs.h.ah= 0x1A;
regs.h.bh= 4;
regs.h.al= (unsigned char)status;
int86(0x21,&regs,&regs);
}
1A Enable/Disable Key or Key Function
Entry Parameter: AH = 1AH
BH = 5
AL = 0 ; All keys
1 ; Supervisor mode
2 ; Cold start
3 ; Warm start
4 ; User mode (press [CMD] for 2 seconds)
5 ; ALPHA key
BL = 0 ; Disable key or key function
1 ; Enable key or key function
Return Value: None
Example :
void TD_keylock(int type,int status)
{
regs.h.ah= 0x1A;