Unitech PT600, Programming Reference Manual

Page: 15 / 77

06 Direct Console I/O
Entry Parameter: AH = 6
DL = 0 – 254 ; write ASCII character in DL to LCD
255 ; read ASCII character from keypad
Return Value: 1) When read (DL <> 255):
Character in AL if ZERO flag is cleared
No input if ZERO flag is set
2) When write (DL= 255):
None
Example:
unsigned char TS_stdin_out(unsigned char ch)
{
regs.h.ah= 6;
regs.h.dl= ch;
int86(0x21,&regs,&regs);
if (ch == 0xFF)
{
if ((regs.x.cflag & 0x40) == 0) return(regs.h.al);
else return(0);
}
return(0);
}
07 Read Keypad (wait if no key)
Entry Parameter: AH = 7
Return Value: AL = 0 – 255 ; ASCII character
Example:
unsigned char TS_stdin_noecho()
{
regs.h.ah= 7;
int86(0x21,&regs,&regs);
return(regs.h.al);
}
08 Read Keypad (wait if no key)
Entry Parameter: AH = 8
Return Value: AL = 0 – 255 ; ASCII character