SECTION 2
Supporting DOS Applications
2-28 PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide
printf(“Can’t open modem\n”);
exit(255);
}
// get file handle of driver
hndl = _fileno(modem);
// do the IOCTL_IN calls
GetDriverParms();
GetMfgId();
GetProdInfo();
fclose(modem);
// close driver to conserve power
}
Device Driver Errors
The following errors are returned to DOS applications:
0x0100 Command OK.
0x8102 Device not ready. Indicates card not in slot.
0x8103 Unknown DOS command.
0x810c General failure; All other errors and power too low to run device.
Interrupts Supported by NGENMOD.SYS
The 4000 Series interrupts supported by NGENMOD.SYS are identified by the
symbolic notation,
NGENMOD
.
INT 14h
INT 14h interfaces manage modem power or get error codes dealing with the
modem powerĆon sequence. The supported INT 14h functions are intercepted
when DX+1 represents the COM port specified on the modem driver line.
The list of INT 14 functions supported by the NGENMOD device driver is as
follows:
"
Initialize Communications Port
AH=00h
"
Extended Initialize
AH=04h
"
NOTE:
These two functions apply only to modems:
"
Get Extended Error
AH=FEh
"
Port Power Off/On
AH=FFh
INT 15h
APM interfaces manage modem power. The list of INT 15 functions supported
by the NGENMOD device driver is as follows:
"
Set Power State AX=5307
"
Get Power State AX=530C
"
NOTE:
These interfaces are reserved solely for internal use and application use may affect applica-
tion portability. Therefore, applications should not use them.
2. DOS
Applications
