Int 21/AX=4402h

PenDOS PENDEV.SYS - GET ENTRY POINTS

AX = 4402h
BX = file handle for device "$$PENDOS" or "$$PD_REG"
CX = size of buffer (4 for $$PENDOS and a 4,8,12, or 16 for $$PD_REG)
DS:DX -> buffer for entry point record (see #01500)

Return:
CF clear if successful
buffer filled
CF set on error
AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)

Program: A limited version of PenDOS by Communication Intelligence Corporation, which provides pen capability to keyboard-based programs, is bundled with IBM DOS 6.1

See Also: AX=4403h"PENDEV.SYS"


Format of PENDEV.SYS entry point record:

Offset  Size    Description     (Table 01500)
00h    DWORD   -> array of jumps
04h    WORD    offset of function to retrieve entry point (see #01501)
06h  2 BYTEs   signature "Pe"
08h    WORD    offset of function to set entry point (see #01502)
0Ah  2 BYTEs   signature "nD"
0Ch    WORD    offset of function to clear entry point (see #01503)
0Eh    WORD    signature "OS"


(Table 01501)
Call PENDEV.SYS function to retrieve entry point with:.
AX = index of entry point (0-9)

Return:
CF clear if successful
DX:AX -> desired entry point
CF set on error (AX out of range)


(Table 01502)
Call PENDEV.SYS function to set entry point with:
AX = index of entry point (0-9)
DX:SI -> new handler

Return:
CF clear if successful
CF set on error (AX out of range)


(Table 01503)
Call PENDEV.SYS function to clear entry point with:
AX = index of entry point (0-9)

Return:
CF clear if successful
CF set on error (AX out of range)

Note: Resets the jump at the specified entry point to its default target, which simply returns

Category: Non-Traditional Input Devices - Int 21h - P

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