// license:BSD-3-Clause
// copyright-holders:Roberto Lavarone
/**********************************************************************
SMC KR2376 Keyboard Encoder emulation
**********************************************************************/
#include "emu.h"
#include "kr2376.h"
static const UINT8 KR2376_KEY_CODES[3][8][11] =
{
// normal
{
// Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
// NUL SOH STX ETX EOT ENQ ACK BEL DC1 P O X0
{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x11, 0x50, 0x30 }, // X0
// DLE K L N M NAK SYN ETB CAN EM SUB X1
{ 0x10, 0x4b, 0x4c, 0x4e, 0x4d, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a }, // X1
// - FS GS RS US < > , SP . _ X2
{ 0x2d, 0x1c, 0x1d, 0x1e, 0x1f, 0x3c, 0x3e, 0x2c, 0x20, 0x2e, 0x5f }, // X2
// 0 : p _ @ BS [ ] CR LF DEL X3
{ 0x30, 0x3a, 0x70, 0x5f, 0x40, 0x08, 0x5B, 0x5d, 0x0d, 0x0a, 0x7f }, // X3
{ 0x3b, 0x2f, 0x2e, 0x2c, 0x6d, 0x6e, 0x62, 0x76, 0x63, 0x78, 0x7a }, // X4
{ 0x6c, 0x6b, 0x6a, 0x68, 0x67, 0x66, 0x64, 0x73, 0x61, 0x0c, 0x1b }, // X5
{ 0x6f, 0x69, 0x75, 0x79, 0x74, 0x72, 0x65, 0x77, 0x71, 0x09, 0x0b }, // X6
{ 0x39, 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31, 0x5e, 0x5c } // X7
},
// shift
{
// Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
// NUL SOH STX ETX EOT ENQ ACK BEL DC1 @ _ X0
{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x11, 0x40, 0x5f }, // X0
// DLE [ \ ^ ] NAK SYN ETB CAN EM SUB X1
{ 0x10, 0x5b, 0x5c, 0x5e, 0x5d, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a }, // X1
// = FS GS RS US < > , SP . _ X2
{ 0x3d, 0x1c, 0x1d, 0x1e, 0x1f, 0x3c, 0x3e, 0x2c, 0x20, 0x2e, 0x5f }, // X2
// NUL * P DEL ` BS { } CR LF DEL X3
{ 0x00, 0x2a, 0x50, 0x7f, 0x60, 0x08, 0x7b, 0x7d, 0x0d, 0x0a, 0x7f }, // X3
{ 0x2b, 0x3f, 0x3e, 0x3c, 0x4d, 0x4e, 0x42, 0x56, 0x43, 0x58, 0x5a }, // X4
{ 0x4c, 0x4b, 0x4a, 0x48, 0x47, 0x46, 0x44, 0x53, 0x41, 0x0c, 0x1b }, // X5
{ 0x4f, 0x49, 0x55, 0x59, 0x54, 0x52, 0x45, 0x57, 0x51, 0x09, 0x0b }, // X6
{ 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21, 0x7e, 0x7c } // X7
},
// control
{
// Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
// NUL SOH STX ETX EOT ENQ ACK BEL DC1 DLE SI X0
{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x11, 0x10, 0x0f }, // X0
// DLE VT FF SO CR NAK SYN ETB CAN EM SUB X1
{ 0x10, 0x0b, 0x0c, 0x0e, 0x0d, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a }, // X1
// NUL FS GS RS US NUL NUL NUL SP NUL US X2
{ 0x00, 0x1c, 0x1d, 0x1e, 0x1f, 0x00, 0x00, 0x00, 0x20, 0x00, 0x1f }, // X2
// NUL NUL DLE US NUL BS ESC GS CR LF DEL X3
{ 0x00, 0x00, 0x10, 0x1f, 0x00, 0x08, 0x1B, 0x1d, 0x0d, 0x0a, 0x7f }, // X3
{ 0x00, 0x00, 0x00, 0x00, 0x1d, 0x0e, 0x02, 0x16, 0x03, 0x18, 0x1a }, // X4
{ 0x0c, 0x0b, 0x0a, 0x08, 0x07, 0x06, 0x04, 0x13, 0x01, 0x0c, 0x1b }, // X5
{ 0x1f, 0x09, 0x15, 0x19, 0x14, 0x12, 0x05, 0x17, 0x11, 0x09, 0x0b }, // X6
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x1c } // X7
}
};
const device_type KR2376 = &device_creator<kr2376_device>;
kr2376_device::kr2376_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, KR2376, "SMC KR2376", tag, owner, clock, "kr2376", __FILE__),
m_write_strobe(*this)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void kr2376_device::device_start()
{
m_write_strobe.resolve_safe();
/* set initial values */
m_ring11 = 0;
m_ring8 = 0;
m_modifiers = 0;
m_strobe = 0;
m_strobe_old = 0;
m_parity = 0;
m_data = 0;
memset(m_pins, 0x00, sizeof(m_pins));
change_output_lines();
/* create the timers */
m_scan_timer = timer_alloc(TIMER_SCAN_TICK);
m_scan_timer->adjust(attotime::zero, 0, attotime::from_hz(clock()));
/* register for state saving */
save_item(NAME(m_pins));
save_item(NAME(m_ring11));
save_item(NAME(m_ring8));
save_item(NAME(m_modifiers));
save_item(NAME(m_strobe));
save_item(NAME(m_strobe_old));
save_item(NAME(m_parity));
save_item(NAME(m_data));
}
/*-------------------------------------------------
set_input_pin - set an input pin
-------------------------------------------------*/
void kr2376_device::set_input_pin( kr2376_input_pin_t pin, int data )
{
data = data ? 1 : 0;
switch ( pin )
{
case KR2376_PII:
case KR2376_DSII:
m_pins[pin] = data;
break;
}
}
/*-------------------------------------------------
get_output_pin - get the status of an output pin
-------------------------------------------------*/
int kr2376_device::get_output_pin( kr2376_output_pin_t pin )
{
return m_pins[pin];
}
void kr2376_device::change_output_lines()
{
if (m_strobe != m_strobe_old)
{
m_strobe_old = m_strobe;
if (m_strobe) // strobe 0 --> 1 transition
{
/* update parity */
m_pins[KR2376_PO] = m_parity ^ m_pins[KR2376_PII];
}
m_pins[KR2376_SO] = m_strobe ^ m_pins[KR2376_DSII];
m_write_strobe(m_strobe ^ m_pins[KR2376_DSII]);
}
}
void kr2376_device::clock_scan_counters()
{
/* ring counters inhibited while strobe active */
if (!m_strobe)
{
m_ring11++;
if (m_ring11 == 11)
{
m_ring11 = 0;
m_ring8++;
if (m_ring8 == 8)
m_ring8 = 0;
}
}
}
void kr2376_device::detect_keypress()
{
static const char *const keynames[] = { "X0", "X1", "X2", "X3", "X4", "X5", "X6", "X7" };
if (ioport(keynames[m_ring8])->read() == (1 << m_ring11))
{
m_modifiers = ioport("MODIFIERS")->read();
m_strobe = 1;
/* strobe 0->1 transition, encode char and update parity */
if (!m_strobe_old)
{
int i;
int parbit;
int shift = BIT(m_modifiers, 0);
int control = BIT(m_modifiers, 1);
int alpha = BIT(m_modifiers, 2);
int table = 0;
if (shift || alpha)
table = 1;
else if (control)
table = 2;
m_data = KR2376_KEY_CODES[table][m_ring8][m_ring11];
/* Compute ODD parity */
m_parity = m_data;
parbit = 0;
for (i=0; i<8; i++)
parbit ^= (m_parity >> i) & 1;
m_parity = parbit;
}
}
else
{
m_strobe = 0;
}
}
void kr2376_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
switch (id)
{
case TIMER_SCAN_TICK:
change_output_lines();
clock_scan_counters();
detect_keypress();
break;
}
}
/* Keyboard Data */
READ8_MEMBER( kr2376_device::data_r )
{
if (m_pins[KR2376_DSII])
return m_data ^ 0xff;
else
return m_data;
}
/* Input Ports */
INPUT_PORTS_START( kr2376 )
PORT_START("X0")
PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0002, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0004, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0010, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0020, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0040, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_START("X1")
PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0002, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0004, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0010, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0020, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0040, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_START("X2")
PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('=')
PORT_BIT( 0x0002, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0004, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0010, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0020, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0040, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')
PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CHAR('_')
PORT_START("X3")
PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0) PORT_CHAR('0')
PORT_BIT( 0x0002, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COLON) PORT_CHAR(':') PORT_CHAR('*')
PORT_BIT( 0x0004, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_P) PORT_CHAR('p') PORT_CHAR('P')
PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0010, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_QUOTE) PORT_CHAR('`') PORT_CHAR('@')
PORT_BIT( 0x0020, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8) PORT_NAME("Del")
PORT_BIT( 0x0040, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('[') PORT_CHAR('{')
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(']') PORT_CHAR('}')
PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13) PORT_NAME("CR")
PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_HOME) PORT_CHAR(UCHAR_MAMEKEY(HOME)) PORT_CHAR(10) PORT_NAME("LF")
PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_START("X4")
PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR('+')
PORT_BIT( 0x0002, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
PORT_BIT( 0x0004, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>')
PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<')
PORT_BIT( 0x0010, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_M) PORT_CHAR('m') PORT_CHAR('M')
PORT_BIT( 0x0020, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_N) PORT_CHAR('n') PORT_CHAR('N')
PORT_BIT( 0x0040, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('b') PORT_CHAR('B')
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_V) PORT_CHAR('v') PORT_CHAR('V')
PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('c') PORT_CHAR('C')
PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_X) PORT_CHAR('x') PORT_CHAR('X')
PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Z) PORT_CHAR('z') PORT_CHAR('Z')
PORT_START("X5")
PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_L) PORT_CHAR('l') PORT_CHAR('L')
PORT_BIT( 0x0002, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_K) PORT_CHAR('k') PORT_CHAR('K')
PORT_BIT( 0x0004, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_J) PORT_CHAR('j') PORT_CHAR('J')
PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_H) PORT_CHAR('h') PORT_CHAR('H')
PORT_BIT( 0x0010, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_G) PORT_CHAR('c') PORT_CHAR('G')
PORT_BIT( 0x0020, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F) PORT_CHAR('f') PORT_CHAR('F')
PORT_BIT( 0x0040, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('d') PORT_CHAR('D')
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_S) PORT_CHAR('s') PORT_CHAR('S')
PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('a') PORT_CHAR('A')
PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_ESC) PORT_CHAR(UCHAR_MAMEKEY(ESC))
PORT_START("X6")
PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_O) PORT_CHAR('o') PORT_CHAR('O')
PORT_BIT( 0x0002, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_I) PORT_CHAR('i') PORT_CHAR('I')
PORT_BIT( 0x0004, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_U) PORT_CHAR('u') PORT_CHAR('U')
PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Y) PORT_CHAR('y') PORT_CHAR('Y')
PORT_BIT( 0x0010, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_T) PORT_CHAR('t') PORT_CHAR('T')
PORT_BIT( 0x0020, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_R) PORT_CHAR('r') PORT_CHAR('R')
PORT_BIT( 0x0040, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('e') PORT_CHAR('E')
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_W) PORT_CHAR('w') PORT_CHAR('W')
PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Q) PORT_CHAR('q') PORT_CHAR('Q')
PORT_START("X7")
PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR(')')
PORT_BIT( 0x0002, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(')
PORT_BIT( 0x0004, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('\'')
PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&')
PORT_BIT( 0x0010, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')
PORT_BIT( 0x0020, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')
PORT_BIT( 0x0040, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#')
PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('"')
PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')
PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_TILDE) PORT_CHAR('^') PORT_CHAR('~')
PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('\\') PORT_CHAR('|')
PORT_START("MODIFIERS")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_LCONTROL) PORT_CODE(KEYCODE_RCONTROL) PORT_CHAR(UCHAR_MAMEKEY(LCONTROL)) PORT_CHAR(UCHAR_MAMEKEY(RCONTROL))
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_CAPSLOCK) PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK))
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor kr2376_device::device_input_ports() const
{
return INPUT_PORTS_NAME( kr2376 );
}