821 lines
27 KiB
ReStructuredText
821 lines
27 KiB
ReStructuredText
====================================
|
|
Intelligent Keyboard (ikbd) Protocol
|
|
====================================
|
|
|
|
|
|
Introduction
|
|
============
|
|
|
|
The Atari Corp. Intelligent Keyboard (ikbd) is a general purpose keyboard
|
|
controller that is flexible enough that it can be used in a variety of
|
|
products without modification. The keyboard, with its microcontroller,
|
|
provides a convenient connection point for a mouse and switch-type joysticks.
|
|
The ikbd processor also maintains a time-of-day clock with one second
|
|
resolution.
|
|
The ikbd has been designed to be general enough that it can be used with a
|
|
variety of new computer products. Product variations in a number of
|
|
keyswitches, mouse resolution, etc. can be accommodated.
|
|
The ikbd communicates with the main processor over a high speed bi-directional
|
|
serial interface. It can function in a variety of modes to facilitate
|
|
different applications of the keyboard, joysticks, or mouse. Limited use of
|
|
the controller is possible in applications in which only a unidirectional
|
|
communications medium is available by carefully designing the default modes.
|
|
|
|
Keyboard
|
|
========
|
|
|
|
The keyboard always returns key make/break scan codes. The ikbd generates
|
|
keyboard scan codes for each key press and release. The key scan make (key
|
|
closure) codes start at 1, and are defined in Appendix A. For example, the
|
|
ISO key position in the scan code table should exist even if no keyswitch
|
|
exists in that position on a particular keyboard. The break code for each key
|
|
is obtained by ORing 0x80 with the make code.
|
|
|
|
The special codes 0xF6 through 0xFF are reserved for use as follows:
|
|
|
|
=================== ====================================================
|
|
Code Command
|
|
=================== ====================================================
|
|
0xF6 status report
|
|
0xF7 absolute mouse position record
|
|
0xF8-0xFB relative mouse position records (lsbs determined by
|
|
mouse button states)
|
|
0xFC time-of-day
|
|
0xFD joystick report (both sticks)
|
|
0xFE joystick 0 event
|
|
0xFF joystick 1 event
|
|
=================== ====================================================
|
|
|
|
The two shift keys return different scan codes in this mode. The ENTER key
|
|
and the RETurn key are also distinct.
|
|
|
|
Mouse
|
|
=====
|
|
|
|
The mouse port should be capable of supporting a mouse with resolution of
|
|
approximately 200 counts (phase changes or 'clicks') per inch of travel. The
|
|
mouse should be scanned at a rate that will permit accurate tracking at
|
|
velocities up to 10 inches per second.
|
|
The ikbd can report mouse motion in three distinctly different ways. It can
|
|
report relative motion, absolute motion in a coordinate system maintained
|
|
within the ikbd, or by converting mouse motion into keyboard cursor control
|
|
key equivalents.
|
|
The mouse buttons can be treated as part of the mouse or as additional
|
|
keyboard keys.
|
|
|
|
Relative Position Reporting
|
|
---------------------------
|
|
|
|
In relative position mode, the ikbd will return relative mouse position
|
|
records whenever a mouse event occurs. A mouse event consists of a mouse
|
|
button being pressed or released, or motion in either axis exceeding a
|
|
settable threshold of motion. Regardless of the threshold, all bits of
|
|
resolution are returned to the host computer.
|
|
Note that the ikbd may return mouse relative position reports with
|
|
significantly more than the threshold delta x or y. This may happen since no
|
|
relative mouse motion events will be generated: (a) while the keyboard has
|
|
been 'paused' ( the event will be stored until keyboard communications is
|
|
resumed) (b) while any event is being transmitted.
|
|
|
|
The relative mouse position record is a three byte record of the form
|
|
(regardless of keyboard mode)::
|
|
|
|
%111110xy ; mouse position record flag
|
|
; where y is the right button state
|
|
; and x is the left button state
|
|
X ; delta x as twos complement integer
|
|
Y ; delta y as twos complement integer
|
|
|
|
Note that the value of the button state bits should be valid even if the
|
|
MOUSE BUTTON ACTION has set the buttons to act like part of the keyboard.
|
|
If the accumulated motion before the report packet is generated exceeds the
|
|
+127...-128 range, the motion is broken into multiple packets.
|
|
Note that the sign of the delta y reported is a function of the Y origin
|
|
selected.
|
|
|
|
Absolute Position reporting
|
|
---------------------------
|
|
|
|
The ikbd can also maintain absolute mouse position. Commands exist for
|
|
resetting the mouse position, setting X/Y scaling, and interrogating the
|
|
current mouse position.
|
|
|
|
Mouse Cursor Key Mode
|
|
---------------------
|
|
|
|
The ikbd can translate mouse motion into the equivalent cursor keystrokes.
|
|
The number of mouse clicks per keystroke is independently programmable in
|
|
each axis. The ikbd internally maintains mouse motion information to the
|
|
highest resolution available, and merely generates a pair of cursor key events
|
|
for each multiple of the scale factor.
|
|
Mouse motion produces the cursor key make code immediately followed by the
|
|
break code for the appropriate cursor key. The mouse buttons produce scan
|
|
codes above those normally assigned for the largest envisioned keyboard (i.e.
|
|
LEFT=0x74 & RIGHT=0x75).
|
|
|
|
Joystick
|
|
========
|
|
|
|
Joystick Event Reporting
|
|
------------------------
|
|
|
|
In this mode, the ikbd generates a record whenever the joystick position is
|
|
changed (i.e. for each opening or closing of a joystick switch or trigger).
|
|
|
|
The joystick event record is two bytes of the form::
|
|
|
|
%1111111x ; Joystick event marker
|
|
; where x is Joystick 0 or 1
|
|
%x000yyyy ; where yyyy is the stick position
|
|
; and x is the trigger
|
|
|
|
Joystick Interrogation
|
|
----------------------
|
|
|
|
The current state of the joystick ports may be interrogated at any time in
|
|
this mode by sending an 'Interrogate Joystick' command to the ikbd.
|
|
|
|
The ikbd response to joystick interrogation is a three byte report of the form::
|
|
|
|
0xFD ; joystick report header
|
|
%x000yyyy ; Joystick 0
|
|
%x000yyyy ; Joystick 1
|
|
; where x is the trigger
|
|
; and yyy is the stick position
|
|
|
|
Joystick Monitoring
|
|
-------------------
|
|
|
|
A mode is available that devotes nearly all of the keyboard communications
|
|
time to reporting the state of the joystick ports at a user specifiable rate.
|
|
It remains in this mode until reset or commanded into another mode. The PAUSE
|
|
command in this mode not only stop the output but also temporarily stops
|
|
scanning the joysticks (samples are not queued).
|
|
|
|
Fire Button Monitoring
|
|
----------------------
|
|
|
|
A mode is provided to permit monitoring a single input bit at a high rate. In
|
|
this mode the ikbd monitors the state of the Joystick 1 fire button at the
|
|
maximum rate permitted by the serial communication channel. The data is packed
|
|
8 bits per byte for transmission to the host. The ikbd remains in this mode
|
|
until reset or commanded into another mode. The PAUSE command in this mode not
|
|
only stops the output but also temporarily stops scanning the button (samples
|
|
are not queued).
|
|
|
|
Joystick Key Code Mode
|
|
----------------------
|
|
|
|
The ikbd may be commanded to translate the use of either joystick into the
|
|
equivalent cursor control keystroke(s). The ikbd provides a single breakpoint
|
|
velocity joystick cursor.
|
|
Joystick events produce the make code, immediately followed by the break code
|
|
for the appropriate cursor motion keys. The trigger or fire buttons of the
|
|
joysticks produce pseudo key scan codes above those used by the largest key
|
|
matrix envisioned (i.e. JOYSTICK0=0x74, JOYSTICK1=0x75).
|
|
|
|
Time-of-Day Clock
|
|
=================
|
|
|
|
The ikbd also maintains a time-of-day clock for the system. Commands are
|
|
available to set and interrogate the timer-of-day clock. Time-keeping is
|
|
maintained down to a resolution of one second.
|
|
|
|
Status Inquiries
|
|
================
|
|
|
|
The current state of ikbd modes and parameters may be found by sending status
|
|
inquiry commands that correspond to the ikbd set commands.
|
|
|
|
Power-Up Mode
|
|
=============
|
|
|
|
The keyboard controller will perform a simple self-test on power-up to detect
|
|
major controller faults (ROM checksum and RAM test) and such things as stuck
|
|
keys. Any keys down at power-up are presumed to be stuck, and their BREAK
|
|
(sic) code is returned (which without the preceding MAKE code is a flag for a
|
|
keyboard error). If the controller self-test completes without error, the code
|
|
0xF0 is returned. (This code will be used to indicate the version/release of
|
|
the ikbd controller. The first release of the ikbd is version 0xF0, should
|
|
there be a second release it will be 0xF1, and so on.)
|
|
The ikbd defaults to a mouse position reporting with threshold of 1 unit in
|
|
either axis and the Y=0 origin at the top of the screen, and joystick event
|
|
reporting mode for joystick 1, with both buttons being logically assigned to
|
|
the mouse. After any joystick command, the ikbd assumes that joysticks are
|
|
connected to both Joystick0 and Joystick1. Any mouse command (except MOUSE
|
|
DISABLE) then causes port 0 to again be scanned as if it were a mouse, and
|
|
both buttons are logically connected to it. If a mouse disable command is
|
|
received while port 0 is presumed to be a mouse, the button is logically
|
|
assigned to Joystick1 (until the mouse is reenabled by another mouse command).
|
|
|
|
ikbd Command Set
|
|
================
|
|
|
|
This section contains a list of commands that can be sent to the ikbd. Command
|
|
codes (such as 0x00) which are not specified should perform no operation
|
|
(NOPs).
|
|
|
|
RESET
|
|
-----
|
|
|
|
::
|
|
|
|
0x80
|
|
0x01
|
|
|
|
N.B. The RESET command is the only two byte command understood by the ikbd.
|
|
Any byte following an 0x80 command byte other than 0x01 is ignored (and causes
|
|
the 0x80 to be ignored).
|
|
A reset may also be caused by sending a break lasting at least 200mS to the
|
|
ikbd.
|
|
Executing the RESET command returns the keyboard to its default (power-up)
|
|
mode and parameter settings. It does not affect the time-of-day clock.
|
|
The RESET command or function causes the ikbd to perform a simple self-test.
|
|
If the test is successful, the ikbd will send the code of 0xF0 within 300mS
|
|
of receipt of the RESET command (or the end of the break, or power-up). The
|
|
ikbd will then scan the key matrix for any stuck (closed) keys. Any keys found
|
|
closed will cause the break scan code to be generated (the break code arriving
|
|
without being preceded by the make code is a flag for a key matrix error).
|
|
|
|
SET MOUSE BUTTON ACTION
|
|
-----------------------
|
|
|
|
::
|
|
|
|
0x07
|
|
%00000mss ; mouse button action
|
|
; (m is presumed = 1 when in MOUSE KEYCODE mode)
|
|
; mss=0xy, mouse button press or release causes mouse
|
|
; position report
|
|
; where y=1, mouse key press causes absolute report
|
|
; and x=1, mouse key release causes absolute report
|
|
; mss=100, mouse buttons act like keys
|
|
|
|
This command sets how the ikbd should treat the buttons on the mouse. The
|
|
default mouse button action mode is %00000000, the buttons are treated as part
|
|
of the mouse logically.
|
|
When buttons act like keys, LEFT=0x74 & RIGHT=0x75.
|
|
|
|
SET RELATIVE MOUSE POSITION REPORTING
|
|
-------------------------------------
|
|
|
|
::
|
|
|
|
0x08
|
|
|
|
Set relative mouse position reporting. (DEFAULT) Mouse position packets are
|
|
generated asynchronously by the ikbd whenever motion exceeds the setable
|
|
threshold in either axis (see SET MOUSE THRESHOLD). Depending upon the mouse
|
|
key mode, mouse position reports may also be generated when either mouse
|
|
button is pressed or released. Otherwise the mouse buttons behave as if they
|
|
were keyboard keys.
|
|
|
|
SET ABSOLUTE MOUSE POSITIONING
|
|
------------------------------
|
|
|
|
::
|
|
|
|
0x09
|
|
XMSB ; X maximum (in scaled mouse clicks)
|
|
XLSB
|
|
YMSB ; Y maximum (in scaled mouse clicks)
|
|
YLSB
|
|
|
|
Set absolute mouse position maintenance. Resets the ikbd maintained X and Y
|
|
coordinates.
|
|
In this mode, the value of the internally maintained coordinates does NOT wrap
|
|
between 0 and large positive numbers. Excess motion below 0 is ignored. The
|
|
command sets the maximum positive value that can be attained in the scaled
|
|
coordinate system. Motion beyond that value is also ignored.
|
|
|
|
SET MOUSE KEYCODE MOSE
|
|
----------------------
|
|
|
|
::
|
|
|
|
0x0A
|
|
deltax ; distance in X clicks to return (LEFT) or (RIGHT)
|
|
deltay ; distance in Y clicks to return (UP) or (DOWN)
|
|
|
|
Set mouse monitoring routines to return cursor motion keycodes instead of
|
|
either RELATIVE or ABSOLUTE motion records. The ikbd returns the appropriate
|
|
cursor keycode after mouse travel exceeding the user specified deltas in
|
|
either axis. When the keyboard is in key scan code mode, mouse motion will
|
|
cause the make code immediately followed by the break code. Note that this
|
|
command is not affected by the mouse motion origin.
|
|
|
|
SET MOUSE THRESHOLD
|
|
-------------------
|
|
|
|
::
|
|
|
|
0x0B
|
|
X ; x threshold in mouse ticks (positive integers)
|
|
Y ; y threshold in mouse ticks (positive integers)
|
|
|
|
This command sets the threshold before a mouse event is generated. Note that
|
|
it does NOT affect the resolution of the data returned to the host. This
|
|
command is valid only in RELATIVE MOUSE POSITIONING mode. The thresholds
|
|
default to 1 at RESET (or power-up).
|
|
|
|
SET MOUSE SCALE
|
|
---------------
|
|
|
|
::
|
|
|
|
0x0C
|
|
X ; horizontal mouse ticks per internal X
|
|
Y ; vertical mouse ticks per internal Y
|
|
|
|
This command sets the scale factor for the ABSOLUTE MOUSE POSITIONING mode.
|
|
In this mode, the specified number of mouse phase changes ('clicks') must
|
|
occur before the internally maintained coordinate is changed by one
|
|
(independently scaled for each axis). Remember that the mouse position
|
|
information is available only by interrogating the ikbd in the ABSOLUTE MOUSE
|
|
POSITIONING mode unless the ikbd has been commanded to report on button press
|
|
or release (see SET MOSE BUTTON ACTION).
|
|
|
|
INTERROGATE MOUSE POSITION
|
|
--------------------------
|
|
|
|
::
|
|
|
|
0x0D
|
|
Returns:
|
|
0xF7 ; absolute mouse position header
|
|
BUTTONS
|
|
0000dcba ; where a is right button down since last interrogation
|
|
; b is right button up since last
|
|
; c is left button down since last
|
|
; d is left button up since last
|
|
XMSB ; X coordinate
|
|
XLSB
|
|
YMSB ; Y coordinate
|
|
YLSB
|
|
|
|
The INTERROGATE MOUSE POSITION command is valid when in the ABSOLUTE MOUSE
|
|
POSITIONING mode, regardless of the setting of the MOUSE BUTTON ACTION.
|
|
|
|
LOAD MOUSE POSITION
|
|
-------------------
|
|
|
|
::
|
|
|
|
0x0E
|
|
0x00 ; filler
|
|
XMSB ; X coordinate
|
|
XLSB ; (in scaled coordinate system)
|
|
YMSB ; Y coordinate
|
|
YLSB
|
|
|
|
This command allows the user to preset the internally maintained absolute
|
|
mouse position.
|
|
|
|
SET Y=0 AT BOTTOM
|
|
-----------------
|
|
|
|
::
|
|
|
|
0x0F
|
|
|
|
This command makes the origin of the Y axis to be at the bottom of the
|
|
logical coordinate system internal to the ikbd for all relative or absolute
|
|
mouse motion. This causes mouse motion toward the user to be negative in sign
|
|
and away from the user to be positive.
|
|
|
|
SET Y=0 AT TOP
|
|
--------------
|
|
|
|
::
|
|
|
|
0x10
|
|
|
|
Makes the origin of the Y axis to be at the top of the logical coordinate
|
|
system within the ikbd for all relative or absolute mouse motion. (DEFAULT)
|
|
This causes mouse motion toward the user to be positive in sign and away from
|
|
the user to be negative.
|
|
|
|
RESUME
|
|
------
|
|
|
|
::
|
|
|
|
0x11
|
|
|
|
Resume sending data to the host. Since any command received by the ikbd after
|
|
its output has been paused also causes an implicit RESUME this command can be
|
|
thought of as a NO OPERATION command. If this command is received by the ikbd
|
|
and it is not PAUSED, it is simply ignored.
|
|
|
|
DISABLE MOUSE
|
|
-------------
|
|
|
|
::
|
|
|
|
0x12
|
|
|
|
All mouse event reporting is disabled (and scanning may be internally
|
|
disabled). Any valid mouse mode command resumes mouse motion monitoring. (The
|
|
valid mouse mode commands are SET RELATIVE MOUSE POSITION REPORTING, SET
|
|
ABSOLUTE MOUSE POSITIONING, and SET MOUSE KEYCODE MODE. )
|
|
N.B. If the mouse buttons have been commanded to act like keyboard keys, this
|
|
command DOES affect their actions.
|
|
|
|
PAUSE OUTPUT
|
|
------------
|
|
|
|
::
|
|
|
|
0x13
|
|
|
|
Stop sending data to the host until another valid command is received. Key
|
|
matrix activity is still monitored and scan codes or ASCII characters enqueued
|
|
(up to the maximum supported by the microcontroller) to be sent when the host
|
|
allows the output to be resumed. If in the JOYSTICK EVENT REPORTING mode,
|
|
joystick events are also queued.
|
|
Mouse motion should be accumulated while the output is paused. If the ikbd is
|
|
in RELATIVE MOUSE POSITIONING REPORTING mode, motion is accumulated beyond the
|
|
normal threshold limits to produce the minimum number of packets necessary for
|
|
transmission when output is resumed. Pressing or releasing either mouse button
|
|
causes any accumulated motion to be immediately queued as packets, if the
|
|
mouse is in RELATIVE MOUSE POSITION REPORTING mode.
|
|
Because of the limitations of the microcontroller memory this command should
|
|
be used sparingly, and the output should not be shut of for more than <tbd>
|
|
milliseconds at a time.
|
|
The output is stopped only at the end of the current 'even'. If the PAUSE
|
|
OUTPUT command is received in the middle of a multiple byte report, the packet
|
|
will still be transmitted to conclusion and then the PAUSE will take effect.
|
|
When the ikbd is in either the JOYSTICK MONITORING mode or the FIRE BUTTON
|
|
MONITORING mode, the PAUSE OUTPUT command also temporarily stops the
|
|
monitoring process (i.e. the samples are not enqueued for transmission).
|
|
|
|
SET JOYSTICK EVENT REPORTING
|
|
----------------------------
|
|
|
|
::
|
|
|
|
0x14
|
|
|
|
Enter JOYSTICK EVENT REPORTING mode (DEFAULT). Each opening or closure of a
|
|
joystick switch or trigger causes a joystick event record to be generated.
|
|
|
|
SET JOYSTICK INTERROGATION MODE
|
|
-------------------------------
|
|
|
|
::
|
|
|
|
0x15
|
|
|
|
Disables JOYSTICK EVENT REPORTING. Host must send individual JOYSTICK
|
|
INTERROGATE commands to sense joystick state.
|
|
|
|
JOYSTICK INTERROGATE
|
|
--------------------
|
|
|
|
::
|
|
|
|
0x16
|
|
|
|
Return a record indicating the current state of the joysticks. This command
|
|
is valid in either the JOYSTICK EVENT REPORTING mode or the JOYSTICK
|
|
INTERROGATION MODE.
|
|
|
|
SET JOYSTICK MONITORING
|
|
-----------------------
|
|
|
|
::
|
|
|
|
0x17
|
|
rate ; time between samples in hundredths of a second
|
|
Returns: (in packets of two as long as in mode)
|
|
%000000xy ; where y is JOYSTICK1 Fire button
|
|
; and x is JOYSTICK0 Fire button
|
|
%nnnnmmmm ; where m is JOYSTICK1 state
|
|
; and n is JOYSTICK0 state
|
|
|
|
Sets the ikbd to do nothing but monitor the serial command line, maintain the
|
|
time-of-day clock, and monitor the joystick. The rate sets the interval
|
|
between joystick samples.
|
|
N.B. The user should not set the rate higher than the serial communications
|
|
channel will allow the 2 bytes packets to be transmitted.
|
|
|
|
SET FIRE BUTTON MONITORING
|
|
--------------------------
|
|
|
|
::
|
|
|
|
0x18
|
|
Returns: (as long as in mode)
|
|
%bbbbbbbb ; state of the JOYSTICK1 fire button packed
|
|
; 8 bits per byte, the first sample if the MSB
|
|
|
|
Set the ikbd to do nothing but monitor the serial command line, maintain the
|
|
time-of-day clock, and monitor the fire button on Joystick 1. The fire button
|
|
is scanned at a rate that causes 8 samples to be made in the time it takes for
|
|
the previous byte to be sent to the host (i.e. scan rate = 8/10 * baud rate).
|
|
The sample interval should be as constant as possible.
|
|
|
|
SET JOYSTICK KEYCODE MODE
|
|
-------------------------
|
|
|
|
::
|
|
|
|
0x19
|
|
RX ; length of time (in tenths of seconds) until
|
|
; horizontal velocity breakpoint is reached
|
|
RY ; length of time (in tenths of seconds) until
|
|
; vertical velocity breakpoint is reached
|
|
TX ; length (in tenths of seconds) of joystick closure
|
|
; until horizontal cursor key is generated before RX
|
|
; has elapsed
|
|
TY ; length (in tenths of seconds) of joystick closure
|
|
; until vertical cursor key is generated before RY
|
|
; has elapsed
|
|
VX ; length (in tenths of seconds) of joystick closure
|
|
; until horizontal cursor keystrokes are generated
|
|
; after RX has elapsed
|
|
VY ; length (in tenths of seconds) of joystick closure
|
|
; until vertical cursor keystrokes are generated
|
|
; after RY has elapsed
|
|
|
|
In this mode, joystick 0 is scanned in a way that simulates cursor keystrokes.
|
|
On initial closure, a keystroke pair (make/break) is generated. Then up to Rn
|
|
tenths of seconds later, keystroke pairs are generated every Tn tenths of
|
|
seconds. After the Rn breakpoint is reached, keystroke pairs are generated
|
|
every Vn tenths of seconds. This provides a velocity (auto-repeat) breakpoint
|
|
feature.
|
|
Note that by setting RX and/or Ry to zero, the velocity feature can be
|
|
disabled. The values of TX and TY then become meaningless, and the generation
|
|
of cursor 'keystrokes' is set by VX and VY.
|
|
|
|
DISABLE JOYSTICKS
|
|
-----------------
|
|
|
|
::
|
|
|
|
0x1A
|
|
|
|
Disable the generation of any joystick events (and scanning may be internally
|
|
disabled). Any valid joystick mode command resumes joystick monitoring. (The
|
|
joystick mode commands are SET JOYSTICK EVENT REPORTING, SET JOYSTICK
|
|
INTERROGATION MODE, SET JOYSTICK MONITORING, SET FIRE BUTTON MONITORING, and
|
|
SET JOYSTICK KEYCODE MODE.)
|
|
|
|
TIME-OF-DAY CLOCK SET
|
|
---------------------
|
|
|
|
::
|
|
|
|
0x1B
|
|
YY ; year (2 least significant digits)
|
|
MM ; month
|
|
DD ; day
|
|
hh ; hour
|
|
mm ; minute
|
|
ss ; second
|
|
|
|
All time-of-day data should be sent to the ikbd in packed BCD format.
|
|
Any digit that is not a valid BCD digit should be treated as a 'don't care'
|
|
and not alter that particular field of the date or time. This permits setting
|
|
only some subfields of the time-of-day clock.
|
|
|
|
INTERROGATE TIME-OF-DAT CLOCK
|
|
-----------------------------
|
|
|
|
::
|
|
|
|
0x1C
|
|
Returns:
|
|
0xFC ; time-of-day event header
|
|
YY ; year (2 least significant digits)
|
|
MM ; month
|
|
DD ; day
|
|
hh ; hour
|
|
mm ; minute
|
|
ss ; second
|
|
|
|
All time-of-day is sent in packed BCD format.
|
|
|
|
MEMORY LOAD
|
|
-----------
|
|
|
|
::
|
|
|
|
0x20
|
|
ADRMSB ; address in controller
|
|
ADRLSB ; memory to be loaded
|
|
NUM ; number of bytes (0-128)
|
|
{ data }
|
|
|
|
This command permits the host to load arbitrary values into the ikbd
|
|
controller memory. The time between data bytes must be less than 20ms.
|
|
|
|
MEMORY READ
|
|
-----------
|
|
|
|
::
|
|
|
|
0x21
|
|
ADRMSB ; address in controller
|
|
ADRLSB ; memory to be read
|
|
Returns:
|
|
0xF6 ; status header
|
|
0x20 ; memory access
|
|
{ data } ; 6 data bytes starting at ADR
|
|
|
|
This command permits the host to read from the ikbd controller memory.
|
|
|
|
CONTROLLER EXECUTE
|
|
------------------
|
|
|
|
::
|
|
|
|
0x22
|
|
ADRMSB ; address of subroutine in
|
|
ADRLSB ; controller memory to be called
|
|
|
|
This command allows the host to command the execution of a subroutine in the
|
|
ikbd controller memory.
|
|
|
|
STATUS INQUIRIES
|
|
----------------
|
|
|
|
::
|
|
|
|
Status commands are formed by inclusively ORing 0x80 with the
|
|
relevant SET command.
|
|
|
|
Example:
|
|
0x88 (or 0x89 or 0x8A) ; request mouse mode
|
|
Returns:
|
|
0xF6 ; status response header
|
|
mode ; 0x08 is RELATIVE
|
|
; 0x09 is ABSOLUTE
|
|
; 0x0A is KEYCODE
|
|
param1 ; 0 is RELATIVE
|
|
; XMSB maximum if ABSOLUTE
|
|
; DELTA X is KEYCODE
|
|
param2 ; 0 is RELATIVE
|
|
; YMSB maximum if ABSOLUTE
|
|
; DELTA Y is KEYCODE
|
|
param3 ; 0 if RELATIVE
|
|
; or KEYCODE
|
|
; YMSB is ABSOLUTE
|
|
param4 ; 0 if RELATIVE
|
|
; or KEYCODE
|
|
; YLSB is ABSOLUTE
|
|
0 ; pad
|
|
0
|
|
|
|
The STATUS INQUIRY commands request the ikbd to return either the current mode
|
|
or the parameters associated with a given command. All status reports are
|
|
padded to form 8 byte long return packets. The responses to the status
|
|
requests are designed so that the host may store them away (after stripping
|
|
off the status report header byte) and later send them back as commands to
|
|
ikbd to restore its state. The 0 pad bytes will be treated as NOPs by the
|
|
ikbd.
|
|
|
|
Valid STATUS INQUIRY commands are::
|
|
|
|
0x87 mouse button action
|
|
0x88 mouse mode
|
|
0x89
|
|
0x8A
|
|
0x8B mnouse threshold
|
|
0x8C mouse scale
|
|
0x8F mouse vertical coordinates
|
|
0x90 ( returns 0x0F Y=0 at bottom
|
|
0x10 Y=0 at top )
|
|
0x92 mouse enable/disable
|
|
( returns 0x00 enabled)
|
|
0x12 disabled )
|
|
0x94 joystick mode
|
|
0x95
|
|
0x96
|
|
0x9A joystick enable/disable
|
|
( returns 0x00 enabled
|
|
0x1A disabled )
|
|
|
|
It is the (host) programmer's responsibility to have only one unanswered
|
|
inquiry in process at a time.
|
|
STATUS INQUIRY commands are not valid if the ikbd is in JOYSTICK MONITORING
|
|
mode or FIRE BUTTON MONITORING mode.
|
|
|
|
|
|
SCAN CODES
|
|
==========
|
|
|
|
The key scan codes returned by the ikbd are chosen to simplify the
|
|
implementation of GSX.
|
|
|
|
GSX Standard Keyboard Mapping
|
|
|
|
======= ============
|
|
Hex Keytop
|
|
======= ============
|
|
01 Esc
|
|
02 1
|
|
03 2
|
|
04 3
|
|
05 4
|
|
06 5
|
|
07 6
|
|
08 7
|
|
09 8
|
|
0A 9
|
|
0B 0
|
|
0C \-
|
|
0D \=
|
|
0E BS
|
|
0F TAB
|
|
10 Q
|
|
11 W
|
|
12 E
|
|
13 R
|
|
14 T
|
|
15 Y
|
|
16 U
|
|
17 I
|
|
18 O
|
|
19 P
|
|
1A [
|
|
1B ]
|
|
1C RET
|
|
1D CTRL
|
|
1E A
|
|
1F S
|
|
20 D
|
|
21 F
|
|
22 G
|
|
23 H
|
|
24 J
|
|
25 K
|
|
26 L
|
|
27 ;
|
|
28 '
|
|
29 \`
|
|
2A (LEFT) SHIFT
|
|
2B \\
|
|
2C Z
|
|
2D X
|
|
2E C
|
|
2F V
|
|
30 B
|
|
31 N
|
|
32 M
|
|
33 ,
|
|
34 .
|
|
35 /
|
|
36 (RIGHT) SHIFT
|
|
37 { NOT USED }
|
|
38 ALT
|
|
39 SPACE BAR
|
|
3A CAPS LOCK
|
|
3B F1
|
|
3C F2
|
|
3D F3
|
|
3E F4
|
|
3F F5
|
|
40 F6
|
|
41 F7
|
|
42 F8
|
|
43 F9
|
|
44 F10
|
|
45 { NOT USED }
|
|
46 { NOT USED }
|
|
47 HOME
|
|
48 UP ARROW
|
|
49 { NOT USED }
|
|
4A KEYPAD -
|
|
4B LEFT ARROW
|
|
4C { NOT USED }
|
|
4D RIGHT ARROW
|
|
4E KEYPAD +
|
|
4F { NOT USED }
|
|
50 DOWN ARROW
|
|
51 { NOT USED }
|
|
52 INSERT
|
|
53 DEL
|
|
54 { NOT USED }
|
|
5F { NOT USED }
|
|
60 ISO KEY
|
|
61 UNDO
|
|
62 HELP
|
|
63 KEYPAD (
|
|
64 KEYPAD /
|
|
65 KEYPAD *
|
|
66 KEYPAD *
|
|
67 KEYPAD 7
|
|
68 KEYPAD 8
|
|
69 KEYPAD 9
|
|
6A KEYPAD 4
|
|
6B KEYPAD 5
|
|
6C KEYPAD 6
|
|
6D KEYPAD 1
|
|
6E KEYPAD 2
|
|
6F KEYPAD 3
|
|
70 KEYPAD 0
|
|
71 KEYPAD .
|
|
72 KEYPAD ENTER
|
|
======= ============
|