vt82c586a ETC-unknow, vt82c586a Datasheet - Page 24

• Manufacturer Part Number: vt82c586a
• Description: Integrated Peripheral Controller
• Manufacturer: ETC-unknow

Port 64 - Keyboard / Mouse Command .......................... WO
This port is used to send commands to the keyboard / mouse
controller.
VT82C586A are listed n the table below.
Note: The VT82C586A Keyboard Controller is compatible
with
Controller except that due to its integrated nature, many of the
input and output port pins are not available externally for use
as general purpose I/O pins (even though P13-P16 are set on
power-up as strapping options). In other words, many of the
commands below are provided and “work”, but otherwise
perform no useful function (e.g., commands that set P12-P17
high or low). Also note that setting P10-11, P22-23, P26-27,
and T0-1 high or low directly serves no useful purpose, since
these bits are used to implement the keyboard and mouse ports
and are directly controlled by keyboard controller logic.
Table 4. Keyboard Controller Command Codes
Code
20h
60h
9xh
A1h
A4h
A7h
A8h
A9h
AAh
ABh
ADh
AEh
AFh
B0h
B1h
B2h
B3h
B4h
B5h
B6h
B7h
B8h
B9h
BAh
BBh
BCh
BDh
BEh
BFh
Preliminary Revision 0.1 October 13, 1996
the

Keyboard Command Code Description
Read Control Byte (next byte is Control Byte)
Write Control Byte (next byte is Control Byte)
Set P10 low
Set P12 low
Set P13 low
Set P22 low
Set P23 low
Set P14 low
Set P15 low
Set P10 high
Set P11 high
Set P13 high
Write low nibble (bits 0-3) to P10-P13
Output Keyboard Controller Version #
Test if Password is installed
(always returns F1h to indicate not installed)
Disable Mouse Interface
Enable Mouse Interface
Mouse Interface Test (puts test results in port 60h)
(value: 0=OK, 1=clk stuck low, 2=clk stuck high,
3=data stuck lo, 4=data stuck hi, FF=general error)
KBC self test (returns 55h if OK, FCh if not)
Keyboard Interface Test (see A9h Mouse Test)
Disable Keyboard Interface
Enable Keyboard Interface
Return Version #
Set P11 low
Set P12 high
Set P22 high
Set P23 high
Set P14 high
Set P15 high
VIA
The command codes recognized by the
VT82C42
Industry-Standard
Keyboard
-18-
Code
C0h
C1h
C2h
C8h
C9h
CAh
D0h
D1h
D2h
D3h
D4h
E0h
Exh
Fxh
All other codes not listed are undefined.
Keyboard Command Code Description
the output buffer)
repeatably & put in bits 5-7 of status
active mode)
Read mode (output KBC mode info to port 60
output buffer (bit-0=0 if ISA, 1 if PS/2)
Read Output Port (copy P10-17 output port values
to port 60)
Write Output Port (data byte following is written to
keyboard output port as if it came from keyboard)
Write Keyboard Output Buffer & clear status bit-5
(write following byte to keyboard)
Write Mouse Output Buffer & set status bit-5 (write
following byte to mouse; put value in mouse input
buffer so it appears to have come from the mouse)
Write Mouse (write following byte to mouse)
Read test inputs (T0-1 read to bits 0-1 of resp byte)
Pulse P23-P20 low for 6usec per command bits 3-0
Read input port (read P10-17 input data to
Poll input port low (read input data on P11-13
Poll input port high (same except P15-17)
Unblock P22-23 (use before D1 to change
Reblock P22-23 (protection mechanism for D1)
Set P23-P21 per command bits 3-1
Register Descriptions
VT82C586A