IPC32/19 Scan/Keycode

IPC32/19 SCAN AND KEYCODES

Most of the IPC32/19 front panel keys are multifunction keys with 3 different functions. Any multifunction key offers a print with 3 different colors: 1. black for the main function (default), 2. red and 3. blue for the multifunctions. For using the front panel multifunction keys, there are 2 special keys: 1. the red Alpha key and 2. the blue Shift key.

The electrical structure of the IPC32/19 front panel keys is a matrix keyboard. The keyboard controller for the front panel keys is the BB1 Base Board keyboard scanner. The keyboard scanner on the BB1 Base Board converts any keystroke of a IPC32/19 front panel key into usable codes (scan codes) for application programs.

Any IPC32/19 front panel key offers one fix default scan code (ScanCode). This ScanCode sends the BB1 Base Board keyboard scanner over a serial link to an motherboard keyboard controller on the IPC32/19 PC/104 CPU if a key is pressed. If the motherboard keyboard controller the ScanCode byte has been received, an IRQ1 is generated that invokes the BIOS interrupt 9 handler (INT 9 HANDLER, BIOS keyboard handler). The BIOS reads the ScanCode and translates the ScanCode into a KeyCode.

The next table shows the ScanCodes and KeyCodes for the IPC32/19 front panel keyboard with 34 keys. The table offers 3 columns with ScanCode and KeyCodes. The STANDARD column contains the ScanCodes and KeyCodes for the main function (black print) of any key. The with SHIFT key column contains the ScanCodes and KeyCodes, if a key is pressed together with the blue Shift key. The with ALPHA key column in the table contains the ScanCodes and KeyCodes, if a key is pressed together with the red Alpha key. The ScanCodes and KeyCodes in columns with SHIFT key and with ALPHA key are only valid, if the IPC32/19 keyboard driver 3219SHFT.COM is used.

Key	STANDARD	with SHIFT key	with ALPHA key
...	ScanCode / KeyCode	ScanCode / KeyCode	ScanCode / KeyCode
	0x3b / 0x00	0x40 / 0x00	0x1e / 0x41
	0x3d / 0x00	0x42 / 0x00	0x2e / 0x43
	0x3f / 0x00	0x44 / 0x00	0x12 / 0x45
	0x33 / 0x2c	0x33 / 0x3b	0x22 / 0x47
	---- / ----	---- / ----	---- / ----
	---- / ----	---- / ----	---- / ----
	0x3c / 0x00	0x41 / 0x00	0x30 / 0x42
	0x3e / 0x00	0x43 / 0x00	0x20 / 0x44
	0x34 / 0x2e	0x34 / 0x3a	0x23 / 0x48
	---- / ----	---- / ----	---- / ----
	0x38 / ----	---- / ----	---- / ----
	0x47 / 0x00	0x4f / 0x00	0x17 / 0x49
	0x4b / 0x00	0x56 / 0x3c	0x26 / 0x4c
	0x08 / 0x37	0x08 / 0x2f	0x18 / 0x4f
	0x05 / 0x34	0x05 / 0x24	0x13 / 0x52
	0x02 / 0x31	0x02 / 0x21	0x16 / 0x55
	0x53 / 0x00	0x39 / 0x20	0x2d / 0x58
	0x48 / 0x00	0x49 / 0x00	0x24 / 0x4a
	0x50 / 0x00	0x51 / 0x00	0x32 / 0x4d
	0x09 / 0x38	0x09 / 0x28	0x19 / 0x50
	0x06 / 0x35	0x06 / 0x25	0x1f / 0x53
	0x03 / 0x32	0x03 / 0x22	0x2f / 0x56
	0x0b / 0x30	0x0b / 0x3d	0x15 / 0x59
	0x01 / 0x1b	0x0c / 0x5c	0x25 / 0x4b
	0x4d / 0x00	0x56 / 0x3e	0x31 / 0x4e
	0x0a / 0x39	0x0a / 0x29	0x10 / 0x51
	0x07 / 0x36	0x07 / 0x26	0x14 / 0x54
	0x04 / 0x33	0x35 / 0x2d	0x11 / 0x57
	0x1c / 0x0d	0x1c / 0x0d	0x2c / 0x5a

More information: Download or view the document "The IPC32/19 Keyboard Scanner". Ipc32kbs.PDF (71.159 bytes). This document contains more details over the IPC32/19 keyboard scanner and a architecture overview.