SECTION 2
Supporting DOS Applications
PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide 2-11
AH
Function description (Continued)
AL
28
Random block write to FCB file
93
Create subdirectory
3A
Remove subdirectory
3C
Create or truncate file
3F
Read from file or device
40
Write to file or device (if file handle >= 5)
41
Delete file
4B
Load and/or execute program
4B
05
Set execution state
4E
Find first matching file
4F
Find next matching file
56
Rename file
5A
Create temporary file
5B
Create new file
INT 2Fh API: DOS Multiplex Interrupt
Windows Release Virtual Machine Time Slice — (AX=1680h)
"
NOTE:
If NPOWER is disconnected, this function is not intercepted.
This function saves power when the system is idle and performs a CPU Idle call
prior to passing on the interrupt.
NPOWER.EXE Multiplex Handle — (AH=54h)
NPOWER is basically implementing a subset of the following function calls. The
function 547Fh is a new function that is unique to NPOWER. The following is a
list of the functions implemented by NPOWER. See the
Interrupt Definitions
paragraph in Section 6 for further details.
"
Installation Check, (AX=5400h)
"
Get/Set Power Status, (AX=5401h)
"
Get/Set APM Polling Frequency, (AX=5482h)
"
Extended Installation Check, (AX=547Fh)
"
Get APM Polling Frequency, (AX=5482h, BX=0000h)
"
Set APM Polling Frequency, (AX=5482h, BX
≠
0000h)
INT 74h ISR: Touch Screen Interrupt
This interrupt is intercepted to turn the backlight back on when the global
backlight timer is enabled. A touchscreen driver must be installed and that
driver must pass the interrupt on to NPOWER rather than handling the EOI.
Interrupts Supported by NORAPM.EXE
The definitions of the 4000 Series interrupts supported by NORAPM.EXE, the
APM BIOS, are identified by the symbolic notation,
NORAPM
.
"
NOTE:
These interfaces are reserved solely for internal use and application use of these methods
may affect application portability. Therefore, applications should not use them.
NORAPM.EXEĆsupported APM interrupts are listed in Table 2Ć1. Note that
NORAPM can be configured with certain switches to
ignore
specific interrupts.
2. DOS
Applications
