input/devices/atarikbd.rst

12 provides a convenient connection point for a mouse and switch-type joysticks.
13 The ikbd processor also maintains a time-of-day clock with one second
14 resolution.
17 keyswitches, mouse resolution, etc. can be accommodated.
18 The ikbd communicates with the main processor over a high speed bi-directional
41     0xF8-0xFB       relative mouse position records (lsbs determined by
43     0xFC            time-of-day
55 The mouse port should be capable of supporting a mouse with resolution of
67 ---------------------------
72 settable threshold of motion. Regardless of the threshold, all bits of
73 resolution are returned to the host computer.
89 Note that the value of the button state bits should be valid even if the
92 +127...-128 range, the motion is broken into multiple packets.
97 ---------------------------
104 ---------------------
109 highest resolution available, and merely generates a pair of cursor key events
113 codes above those normally assigned for the largest envisioned keyboard (i.e.
120 ------------------------
133 ----------------------
147 -------------------
156 ----------------------
161 8 bits per byte for transmission to the host. The ikbd remains in this mode
167 ----------------------
177 Time-of-Day Clock
180 The ikbd also maintains a time-of-day clock for the system. Commands are
181 available to set and interrogate the timer-of-day clock. Time-keeping is
182 maintained down to a resolution of one second.
190 Power-Up Mode
193 The keyboard controller will perform a simple self-test on power-up to detect
195 keys. Any keys down at power-up are presumed to be stuck, and their BREAK
197 keyboard error). If the controller self-test completes without error, the code
203 reporting mode for joystick 1, with both buttons being logically assigned to
209 assigned to Joystick1 (until the mouse is reenabled by another mouse command).
219 -----
231 Executing the RESET command returns the keyboard to its default (power-up)
232 mode and parameter settings. It does not affect the time-of-day clock.
233 The RESET command or function causes the ikbd to perform a simple self-test.
235 of receipt of the RESET command (or the end of the break, or power-up). The
241 -----------------------
260 -------------------------------------
274 ------------------------------
292 ----------------------
308 -------------------
317 it does NOT affect the resolution of the data returned to the host. This
319 default to 1 at RESET (or power-up).
322 ---------------
339 --------------------------
360 -------------------
375 -----------------
387 --------------
399 ------
411 -------------
425 ------------
453 ----------------------------
463 -------------------------------
473 --------------------
484 -----------------------
497 time-of-day clock, and monitor the joystick. The rate sets the interval
503 --------------------------
510                         ; 8 bits per byte, the first sample if the MSB
513 time-of-day clock, and monitor the fire button on Joystick 1. The fire button
519 -------------------------
545 every Vn tenths of seconds. This provides a velocity (auto-repeat) breakpoint
552 -----------------
564 TIME-OF-DAY CLOCK SET
565 ---------------------
577 All time-of-day data should be sent to the ikbd in packed BCD format.
580 only some subfields of the time-of-day clock.
582 INTERROGATE TIME-OF-DAT CLOCK
583 -----------------------------
589             0xFC        ; time-of-day event header
597     All time-of-day is sent in packed BCD format.
600 -----------
607     NUM                 ; number of bytes (0-128)
614 -----------
629 ------------------
641 ----------------
727 0C	\-
789 4A	KEYPAD -