Glossary

Matrix For request a special number of keys will be connected in a matrix with x columns and y rows. The connected keyboard controller makes a clocked control of the columns and a clocked reading of the rows (like a table). This is called scanning. So it can be found the position of the pressed key. N-Key-Rollover By a clocking by diodes at the crossover points in the matrix the controller can realize if more than one key is pressed. So there accrue little "Ghost keys". So, for keyboards with multi key usage special diodes are necessary. MF-102 The company International Business Machines IBM created this standard for a multifunction keyboard with 101 and 102 keys. DINs Further information about keyboard standards you can read in the following regulations: DIN 2137 Keyboards and layout DIN 2139 Key adjustment DIN 42115 Foil keyboards Scan codes The keyboard controller scans the matrix. Is there some key press, he reads from the intern code table the selected letter and sends it to the computer. For IBM-XT-AT-PS/2-Sytems the codes are called scan codes. One scan code is significant for a definite key position on a MF-102-keyboard, not for a definite letter (View the table of the Scan codes). Driver (Keyboard driver) For every language layout a separate keyboard driver is existing. This driver is loaded memory resistant at the booting. The driver reads the scan codes and turns them into output able letters of the definite country. USB (Universal Serial Bus) Bidirectional serial interface for peripherical PC components with a higher data transmission rate than RS232. USB is full compliant with Plug & Play.  When the USB device is connected to the USB interface, DOS detects the peripheral. Up to 256 USB peripherals can be added by using a USB hub.

Standards for USB, AT- und PS/2   USB AT PS/2 Connector USB-A USB-B 5-pin DIN 6-pin Mini-DIN 6-pin Mini-DIN Code Set (s. Tab. Scancodes) DATA CLOCK USB Set 2 low active low active Set 3 low active Data transfer Tension Current USB V1.1 USB HID 1.0 5 VDC 500 mA max. serial, synchronic, to IBM 5 V =, TTL-Level 200 mA max. Connector for USB-Keyboards USB-A-Connector (Frontal and Plan View)   1 red  2 white 3 green 4 black   +5V D- D+ Ground   USB-B-Connector (Frontal and Plan View)   Connector DIN-Norm (5-pin)   1 2 3 4 5   CLOCK DATA not used Ground + 5 V (Front view of the DIN-connector) Connector Mini-DIN (6-pin)   1 2 3 4 5 6   DATA not used Ground + 5 V CLOCK not used (Front view of the Mini-DIN-connector) Layout PS/2 Y-Cable PS/2 Pin Signal Keyboard Mouse 1 DAT1   1 (DATA) 2 DAT2 1 (DATA)   3 GND 3 (GND) 3 (GND) 4 Vcc 4 (Vcc) 4 (Vcc) 5 CLK1   5 (CLK) 6 CLK1 5 (CLK)

[No.] Keynumber, [Ze.] Meaning of the code in the german keyboard driver   No. Ze. Set 2 Set 3 USB No. Ze. Set 2 Set 3 USB 1 ^ 0E 0E 35 61 Space 29 29 2C 2 1 16 16 1E 62 AltGr E0,11 39 E6 3 2 1E 1E 1F 63         4 3 26 26 20 64 Ctrl re. E0,14 58 E4 5 4 25 25 21 75 Einf. E0,70 67 49 6 5 2E 2E 22 76 Entf. E0,71 64 4C 7 6 36 36 23 79 Left E0,6B 61 50 8 7 3D 3D 24 80 Pos 1 E0,6C 6E 4A 9 8 3E 3E 25 81 Ende E0,69 65 4D 10 9 46 46 26 82         11 0 45 45 27 83 Up E0,75 63 52 12 ß 4E 4E 2D 84 Down E0,72 60 51 13 ´ 55 55 2E 85 BldUp E0,7D 6F 4B 14         86 BldDn E0,7A 6D 4E 15 BS 66 66 2A 89 Right E0,74 6A 4F 16 TAB 0D 0D 2B 90 Num 77 76 53 17 Q 15 15 14 91 7(num) 6C 6C 5F 18 W 1D 1D 1A 92 4(num) 6B 6B 5C 19 E 24 24 08 93 1(num) 69 69 59 20 R 2D 2D 15 94         21 T 2C 2C 17 95 (num) E0,4A 77 54 22 Z 35 35 1C 96 8(num) 75 75 60 23 U 3C 3C 18 97 5(num) 73 73 5D 24 I 43 43 0C 98 2(num) 72 72 5A 25 O 44 44 12 99 0(num) 70 70 62 26 P 4D 4D 13 100 ·(num) 7C 7C 55 27 Ü 54 54 2F 101 9(num) 7D 7D 61 28 + 5B 5B 30 102 6(num) 74 74 5E 29         103 3(num) 7A 7A 5B 30 Caps L. 58 14 39 104 ,(num) 71 71 63 31 A 1C 1C 04 105 -(num) 7B 84 56 32 S 1B 1B 16 106 +(num) 79 7C 57 33 D 23 23 07 107         34 F 2B 2B 09 108 Enter E0,5A 79 58 35 G 34 34 0A 109         36 H 33 33 0B 110 Esc 76 08 29 37 J 3B 3B 0D 111         38 K 42 42 0E 112 F1 05 07 3A 39 L 4B 4B 0F 113 F2 06 0F 3B 40 Ö 4C 4C 33 114 F3 3C 04 17 41 Ä 52 52 34 115 F4 0C 1F 3D 42 # 5D 53 31 116 F5 03 27 3E 43 Return 5A 5A 28 117 F6 0B 2F 3F 44 Shift li. 12 12 E1 118 F7 83 37 40 45 < 61 13 64 119 F8 0A 3F 41 46 Y 1A 1A 1D 120 F9 01 47 42 47 X 22 22 1B 121 F10 09 4F 43 48 C 21 21 06 122 F11 78 56 44 49 V 2A 2A 19 123 F12 07 5E 45 50 B 32 32 05 124 Druck 57 46 51 N 31 31 11 125 Lock 7E 5F 47 52 M 3A 3A 10 126 Pause 62 48 53 , 41 41 36   54 . 49 49 37 E0,12,E0,7C 55 - 4A 4A 38 E1,14,77,E1,F0,14,F0,77 56           57 Shift re. 59 59 E5 Windows 95-Keys:     58 Ctrl li. 14 11 E0 Windows-Key left: E0,1F E3 59         Windows-Key right: E0,27 E7 60 Alt li. 11 19 E2 Documentation Key: E0,2F 65