DOS Fn 440cH CL=65H: IOCTL Query Retry Iteration Count
Compatibility: 3.3+
Expects: AX 440cH
BX file handle (device or disk file)
CL 65H
CH device category: 00H=unknown
01H=COMn (DOS 3.3+)
03H=console (screen + keyboard) (DOS 3.3+)
05H=parallel printer (DOS 3.2+)
DS:DX Addr of a 16-bit word to receive the current retry count.
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Returns: AX error code if CF is set to CY
DS:DX buffer contains the retry count (if no error)
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Info: Sets the number of times the device driver should try to send
output to the device before assuming that the device is busy.
DS:DX points to a 2-byte buffer. Upon return, the buffer
contains the current 16-bit retry count.
Notes: ■ This is used only for printer drivers that support "Output
until Busy". See Device Requests.
■ This setting is global. Before changing it (via, 440CH 65H),
you should use this fn to obtain the current value. Change it
back before exiting.
See Also: Fn 44H (IOCTL)
Fn 440cH (generic IOCTL for character devices)
Fn 440cH 45H (set retry iteration count)
Generic IOCTL Data Packets
Device Drivers
DOS Functions
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