BASIC KEY Functions - fvdhoef/aquarius-plus GitHub Wiki

GETKEY

TYPE: plusBASIC system function

FORMAT: GETKEY

Action: Waits for a key press, then returns the value of that key.

  • In ASCII mode, returns the ASCII value of the key pressed.
  • In scan-code mode, return the key-down

Note: The GETKEY function causes your plusBASIC program to wait until a key has been pressed. If you need to check for a key press as part of a program loop that performs other tasks while waiting for a key press, use INKEY, below.

GETKEY$

TYPE: plusBASIC system function

FORMAT: GETKEY$

Action: As above, but returns a string containing the ASCII character or scan code.

Note: The GETKEY$ function causes your plusBASIC program to wait until a key has been pressed. If you need to check for a key press as part of a program loop that performs other tasks while waiting for a key press, use INKEY$, below.

INKEY

TYPE: plusBASIC system function

FORMAT: INKEY

Action: Returns the ASCII value of the last key pressed.

  • Returns 0 if no key was pressed.
Aquarius ASCII Codes
Dec Hex Chr Dec Hex Chr Dec Hex Chr Dec Hex Chr
32 20 Sc 64 40 @ 96 60 ` 128 80 F1
33 21 ! 65 41 A 97 61 a 129 81 F2
34 22 " 66 42 B 98 62 b 130 82 F3
35 23 # 67 43 C 99 63 c 131 83 F4
36 24 $ 68 44 D 100 64 d 132 84 F5
37 25 % 69 45 E 101 65 e 133 85 F6
38 26 & 70 46 F 102 66 f 134 86 F7
39 27 ' 71 47 G 103 67 g 135 87 F8
40 28 ( 72 48 H 104 68 h 136 88
41 29 ) 73 49 I 105 69 i 137 89 Pause
42 2A * 74 4A J 106 6A j 138 8A PgUp
43 2B + 75 4B K 107 6B k 139 8B PgDn
44 2C , 76 4C L 108 6C l 140 8C ShfTab
45 2D - 77 4D M 109 6D m 141 8D
46 2E . 78 4E N 110 6E n 142 8E CrsrRt
47 2F / 79 4F O 111 6F o 143 8F CrsrUp
48 30 0 80 50 P 112 70 p 144 90 F9
49 31 1 81 51 Q 113 71 q 145 91 F10
50 32 2 82 52 R 114 72 r 146 92 F11
51 33 3 83 53 S 115 73 s 147 93 F12
52 34 4 84 54 T 116 74 t 148 94 F13
53 35 5 85 55 U 117 75 u 149 95 F14
54 36 6 86 56 V 118 76 v 150 96 F15
55 37 7 87 57 W 119 77 w 151 97 F16
56 38 8 88 58 X 120 78 x 152 98
57 39 9 89 59 Y 121 79 y 153 99
58 3A : 90 5A Z 122 7A z 154 9A End
59 3B ; 91 5B [ 123 7B { 155 9B Home
60 3C < 92 5C \ 124 7C | 156 9C
61 3D = 93 5D ] 125 7D } 157 9D Ins
62 3E > 94 5E ^ 126 7E ~ 158 9E CrsrLf
63 3F ? 95 5F _ 127 7F Del 159 9F CrsrDn

INKEY$

TYPE: BASIC system function

FORMAT: INKEY$

Action: As above, but returns a string containing the ASCII character or scan code.

  • Returns an empty string if no key was pressed.

LWRKEY

TYPE: plusBASIC system function

FORMAT: LWRKEY

Action: As INKEY, but characters A through Z are converted to lowercase.

LWRKEY$

TYPE: plusBASIC system function

FORMAT: LWRKEY$

Action: As INKEY$, but characters A through Z are converted to lowercase.

UPRKEY

TYPE: plusBASIC system function

FORMAT: UPRKEY

Action: As INKEY, but characters a through z are converted to uppercase.

UPRKEY$

TYPE: plusBASIC system function

FORMAT: UPRKEY$

Action: As INKEY$, but characters a through z are converted to uppercase.

KEY

TYPE: BASIC system function

FORMAT: KEY ( keycode )

Action: Returns the state of the specified key.

  • keycode is the key matrix index code of the key to check or -1 to check all keys.
  • If the specified key is currently pressed, -1 is returned, otherwise, 0 is returned.
  • Illegal Quantity error results if keycode is not in the range -1 to 63, inclusive.

Note: keycode is not the same as the ASCII code!

Aquarius Key Codes
Code Hex Key Code Hex Key Code Hex Key Code Hex Key
0 $00 = 16 $10 9 32 $20 6 48 $30 3
1 $01 BKSP 17 $11 O 33 $21 Y 49 $31 E
2 $02 : 18 $12 K 34 $22 G 50 $32 S
3 $03 Return 19 $13 M 35 $23 V 51 $33 Z
4 $04 ; 20 $14 N 36 $24 C 52 $34 Space
5 $05 . 21 $15 J 37 $25 F 53 $35 A
6 $06 Insert 22 $16 CsrLf 38 $26 PgUp 54 $36 Menu
7 $07 Delete 23 $17 CsrDn 39 $27 PgDn 55 $37 Tab
8 $08 - 24 $18 8 40 $28 5 56 $38 2
9 $09 / 25 $19 I 41 $29 T 57 $39 W
10 $0A 0 26 $1A 7 42 $2A 4 58 $3A 1
11 $0B P 27 $1B U 43 $2B R 59 $3B Q
12 $0C L 28 $1C H 44 $2C D 60 $3C Shift
13 $0D , 29 $1D B 45 $2D X 61 $3D Ctrl
14 $0E CsrUp 30 $1E Home 46 $2E Pause 62 $3E Alt
15 $0F CrsRt 31 $1F End 47 $2F PrtSc 63 $3F GUI
Examples

PRINT KEY(3) ...and keep the RETURN key pressed.

Prints -1 because the RETURN key was pressed when evaluated.

PRINT KEY(0) ...with no other key pressed.

Prints 0 because the EQUAL key was NOT pressed when evaluated.

100 REM Check for "w" key
200 if key(57) then print "w"
300 print" "
400 goto 100

Prints the letter "w" whenever the "w" key is pressed, and the letters scroll up the screen.

FORMAT: KEY ( keystring )

Action: As above but checks for multiple keys.

  • keystring is a binary string of single byte keycodes to check for (see Aquarius Key Codes above).
  • Illegal Quantity error results if any keycode is greater than 63.
  • Returns the position in the string of the detected key (0 for none).
  • If multiple keys are pressed, the first key in the list that is pressed is detected.
Examples 
100 REM Check for cursor keys
110 DIM D$(4)="","Up","Down","Right","Left"
120 K=KEY($"0E170F16")
130 IF K THEN PRINT D$(K)
140 GOTO 120

When a cursor key is pressed, prints the key direction to the screen.

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