Specifications

D:\D\inter61a\INTERRUP.A Saturday, January 08, 2011 11:31 AM

2Eh C FDh diag failure (AT-kbd)

2Fh V FEh RESEND

30h B FFh kbd error/buffer full

Notes: scan codes 56h-E1h are only available on the extended (101/102-key)

keyboard and Host Connected (122-key) keyboard; scan codes 5Bh-5Dh

are only available on the 122-key keyboard and the Microsoft Natural

Keyboard; scan codes 5Eh-76h are only available on the 122-key

keyboard

in the default configuration, break codes are the make scan codes with

the high bit set; make codes 60h,61h,70h, etc. are not available

because the corresponding break codes conflict with prefix codes

(code 2Ah is available because the self-test result code AAh is only

sent on keyboard initialization). An alternate keyboard

configuration can be enabled on AT and later systems with enhanced

keyboards, in which break codes are the same as make codes, but

prefixed with an F0h scan code

prefix code E0h indicates that the following make/break code is for a

"gray" duplicate to a key which existed on the original PC keyboard;

prefix code E1h indicates that the following make code has no

corresponding break code (currently only the Pause key generates no

break code)

the Microsoft Natural Keyboard sends make codes 5Bh, 5Ch, and 5Dh

(all with an E0h prefix) for the Left Windows, Right Windows, and

Menu keys on the bottom row

the European "Cherry G81-3000 SAx/04" keyboard contains contacts for

four additional keys, which can be made available by a user

modification; the three new keys located directly below the cursor

pad's Delete, End, and PgDn keys send make codes 66h-68h (F19-F21);

the fourth new key, named <delta>, sends make code 73h

the SysReq key is often labeled SysRq

the "Accord" ergonomic keyboard with optional touchpad (no other

identification visible on keyboard or in owner's booklet) has an

additional key above the Grey- key marked with a left-pointing

triangle and labeled "Fn" in the owner's booklet which returns

scan codes E0h 68h on make and E0h E8h on break

the "Preh Commander AT" keyboard with additional F11-F22 keys treats

F11-F20 as Shift-F1..Shift-F10 and F21/F22 as Ctrl-F1/Ctrl-F2; the

Eagle PC-2 keyboard with F11-F24 keys treated those additional keys

in the same way

[Note1] the "Cherry G80-0777" keyboard has additional F11-F15 keys

which generate make codes 55h-59h; some other extended keyboards

-18-

http://www.foxitsoftware.com For evaluation only.