If the first value obtained from the READKEY function was #0, then
the second call to READKEY will return one of the following.
Second Code Meaning
------------------------------------------------------------------------
3 NUL ( Null Character )
15 Shift Tab ( ---<vv )
16-25 ALT-Q/W/E/R/T/Y/U/I/O/P
30-38 ALT-A/S/D/F/G/H/J/K/L
44-50 ALT-Z/X/C/V/B/N/M
59-68 KEYS F1-F10 ( Disabled as softkeys )
71 Home
72 Up Arrow
73 Page Up
75 Left Arrow
77 Right Arrow
79 End
80 Down Arrow
81 Page Down
82 Insert
83 Delete
84-93 F11 - F20 ( Shift F1 - F10 )
94-103 F21 - F30 ( Control - F1 - F10 )
104-113 F31 - F40 ( Alt F1 - F10 )
114 Ctrl PrtSc
115 Ctrl Left Arrow
116 Ctrl Right Arrow
117 Ctrl End
118 Ctrl Page Down
119 Ctrl Home
120-131 ALT - 1/2/3/4/5/6/7/8/9/0/-/=/
132 Ctrl Page Up
133 F11
134 F12
135 Shift - F11
136 Shift - F12
137 Ctrl - F11
138 Ctrl - F12
139 Alt - F11
140 Alt - F12
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
The following are the Hexadecimal keyboard scan codes
as seen by Turbo Pascal.
KEY SCAN CODE KEY SCAN CODE
------------------------------------------------------------------------
ESC 01 Left/Right arrow 0F
!1 02 Q 10
@2 03 W 11
#3 04 E 12
$4 05 R 13
%5 06 T 14
^6 07 Y 15
&7 08 U 16
*8 09 I 17
(9 0A O 18
)0 0B P 19
_- 0C {[ 1A
+= 0D }] 1B
BackSpace 0E Return 1C
Control 1D |\ 2B
A 1E Z 2C
S 1F X 2D
D 20 C 2E
F 21 V 2F
G 22 B 30
H 23 N 31
J 24 M 32
K 25 <, 33
L 26 >. 34
:; 27 ?/ 35
"' 28 Right Shift 36
~` 29 PrintScr * 37
Left Shift 2A Alt 38
Spacebar 39 7Home 47
CapsLock 3A 8UpArrow 48
F1 3B 9PgUp 49
F2 3C - 4A
F3 3D 4LeftArrow 4B
F4 3E 5 4C
F5 3F 6Right Arrow 4D
F6 40 + 4E
F7 41 1End 4F
F8 42 2Down Arrow 50
F9 43 3PgDn 51
F10 44 0Insert 52
F11 D9 Delete 53
F12 DA Num Lock 45
Scroll Lock 46