Values for generic character IOCTL function

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Value	Description
00h	MAC driver Bind (STARLITE) (see #01547)
40h	DOS 3??? only: was reserved for set screen mode (see #04116)
45h	set iteration (retry) count (see #01548)
4Ah	select code page (see #01549)
4Ch	start code-page preparation (see #01550)
4Dh	end code-page preparation (see #01551)
5Fh	set display information (DOS 4.0+) (see #01552)
60h	DOS 3??? only: was reserved for get screen mode (see #04116)
65h	get iteration (retry) count
6Ah	query selected code page (see #01549)
6Bh	query codepage prepare list (DOS 4.0+) (see #01553)
7Fh	get display information (DOS 4.0+) (see #01552)

Note:

bit assignments for function code:

bit 7 :
set to ignore if unsupported, clear to return error

bit 6 :
set if passed to driver, clear if intercepted by DOS

bit 5 :
set if queries data from device, clear if sends command (by convention, if a function both queries and sends data, bit 5 should be clear)

bits 4 - 0 :
subfunction