void at_keyboard_write(UINT8 data)
{
if (LOG_KEYBOARD)
logerror("keyboard write %.2x\n",data);
switch (keyboard.input_state)
{
case 0:
switch (data) {
case 0xed: // leds schalten
/* acknowledge */
at_keyboard_queue_insert(0x0fa);
/* now waiting for code... */
keyboard.input_state=1;
break;
case 0xee: // echo
/* echo code with no acknowledge */
at_keyboard_queue_insert(0xee);
break;
case 0xf0: // scancodes adjust
/* acknowledge */
at_clear_buffer_and_acknowledge();
/* waiting for data */
keyboard.input_state=2;
break;
case 0xf2: // identify keyboard
/* ack and two byte keyboard id */
at_keyboard_queue_insert(0xfa);
/* send keyboard code */
if (keyboard.type == AT_KEYBOARD_TYPE_MF2) {
at_keyboard_queue_insert(0xab);
at_keyboard_queue_insert(0x41);
}
else
{
/* from help-pc docs */
at_keyboard_queue_insert(0x0ab);
at_keyboard_queue_insert(0x083);
}
break;
case 0xf3: // adjust rates
/* acknowledge */
at_keyboard_queue_insert(0x0fa);
keyboard.input_state=3;
break;
case 0xf4: // activate
at_clear_buffer_and_acknowledge();
keyboard.on=1;
break;
case 0xf5:
/* acknowledge */
at_clear_buffer_and_acknowledge();
// standardvalues
keyboard.on=0;
break;
case 0xf6:
at_clear_buffer_and_acknowledge();
// standardvalues
keyboard.on=1;
break;
case 0xfe: // resend
// should not happen, for now send 0
at_keyboard_queue_insert(0); //keyboard.last_code);
break;
case 0xff: // reset
/* it doesn't state this in the docs I have read, but I assume
that the keyboard input buffer is cleared. The PCW16 sends &ff,
and requires that 0x0fa is the first byte to be read */
at_clear_buffer_and_acknowledge();
// /* acknowledge */
// at_keyboard_queue_insert(0xfa);
/* BAT completion code */
at_keyboard_queue_insert(0xaa);
break;
}
break;
case 1:
/* code received */
keyboard.input_state=0;
/* command? */
if (data & 0x080)
{
/* command received instead of code - execute command */
at_keyboard_write(data);
}
else
{
/* send acknowledge */
at_keyboard_queue_insert(0x0fa);
/* led bits */
/* bits: 0 scroll lock, 1 num lock, 2 capslock */
/* led's in same order as my keyboard leds. */
/* num lock, caps lock, scroll lock */
set_led_status(2, (data & 0x01));
set_led_status(0, ((data & 0x02)>>1));
set_led_status(1, ((data & 0x04)>>2));
}
break;
case 2:
keyboard.input_state=0;
/* command? */
if (data & 0x080)
{
/* command received instead of code - execute command */
at_keyboard_write(data);
}
else
{
/* 00 return byte indicating scan code set in use
01 select scan code set 1 (used on PC & XT)
02 select scan code set 2
03 select scan code set 3
*/
if (data == 0x00)
{
at_keyboard_queue_insert(keyboard.scan_code_set);
}
else
{
keyboard.scan_code_set = data;
}
}
break;
case 3:
/* 6,5: 250ms, 500ms, 750ms, 1s */
/* 4..0: 30 26.7 .... 2 chars/s*/
/* command? */
keyboard.input_state=0;
if (data & 0x080)
{
/* command received instead of code - execute command */
at_keyboard_write(data);
}
else
{
/* received keyboard repeat */
}
break;
}
}
static WRITE8_HANDLER(pcw16_keyboard_control_w)
{
//logerror("Keyboard control w: %02x\n",data);
pcw16_keyboard_previous_state = pcw16_keyboard_state;
/* if set, set parity */
if (data & 0x080)
{
pcw16_keyboard_state |= PCW16_KEYBOARD_PARITY_MASK;
}
/* clear read/write bits */
pcw16_keyboard_state &=
~(PCW16_KEYBOARD_FORCE_KEYBOARD_CLOCK |
PCW16_KEYBOARD_TRANSMIT_MODE);
/* set read/write bits from data */
pcw16_keyboard_state |= (data & 0x03);
if (data & PCW16_KEYBOARD_RESET_INTERFACE)
{
pcw16_keyboard_reset();
}
if (data & PCW16_KEYBOARD_TRANSMIT_MODE)
{
/* force clock changed */
if (((pcw16_keyboard_state^pcw16_keyboard_previous_state) & PCW16_KEYBOARD_FORCE_KEYBOARD_CLOCK)!=0)
{
/* just cleared? */
if ((pcw16_keyboard_state & PCW16_KEYBOARD_FORCE_KEYBOARD_CLOCK)==0)
{
/* write */
/* busy */
pcw16_keyboard_state |= PCW16_KEYBOARD_BUSY_STATUS;
/* keyboard takes data */
at_keyboard_write(pcw16_keyboard_data_shift);
/* set clock low - no furthur transmissions */
pcw16_keyboard_set_clock_state(0);
/* set int */
pcw16_keyboard_int(1);
}
}
}
if (((pcw16_keyboard_state^pcw16_keyboard_previous_state) & PCW16_KEYBOARD_TRANSMIT_MODE)!=0)
{
if ((pcw16_keyboard_state & PCW16_KEYBOARD_TRANSMIT_MODE)==0)
{
if ((pcw16_system_status & (1<<1))!=0)
{
pcw16_keyboard_int(0);
}
}
}
pcw16_keyboard_refresh_outputs();
}
