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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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