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Diffstat (limited to 'src/mess/drivers/sdk80.c')
-rw-r--r--src/mess/drivers/sdk80.c141
1 files changed, 55 insertions, 86 deletions
diff --git a/src/mess/drivers/sdk80.c b/src/mess/drivers/sdk80.c
index 1d05a18f217..240bb0cfc49 100644
--- a/src/mess/drivers/sdk80.c
+++ b/src/mess/drivers/sdk80.c
@@ -1,5 +1,5 @@
// license:BSD-3-Clause
-// copyright-holders:Nigel Barnes
+// copyright-holders:Nigel Barnes,Ryan Holtz
/***************************************************************************
Intel SDK-80
@@ -24,14 +24,14 @@ Please note this rom set boots into BASIC, not monitor.
#include "emu.h"
#include "cpu/i8085/i8085.h"
-//#include "machine/pit8253.h"
-//#include "machine/i8251.h"
-//#include "machine/i8255.h"
-//#include "machine/i8279.h"
+#include "machine/i8251.h"
+#include "machine/clock.h"
+#include "bus/rs232/rs232.h"
//#include "machine/ay31015.h"
-//#include "bus/rs232/rs232.h"
-#include "machine/terminal.h"
+#define I8251A_TAG "usart"
+#define I8251A_BAUD_TAG "usart_baud"
+#define RS232_TAG "rs232"
class sdk80_state : public driver_device
{
@@ -39,21 +39,25 @@ public:
sdk80_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
- , m_terminal(*this, "terminal")
+ , m_usart(*this, I8251A_TAG)
+ , m_rs232(*this, RS232_TAG)
+ , m_usart_baud_rate(*this, I8251A_BAUD_TAG)
+ , m_usart_divide_counter(0)
+ , m_usart_clock_state(0)
{ }
- DECLARE_WRITE8_MEMBER(scanlines_w);
- DECLARE_WRITE8_MEMBER(digit_w);
- DECLARE_READ8_MEMBER(kbd_r);
- DECLARE_READ8_MEMBER(portec_r);
- DECLARE_READ8_MEMBER(ported_r);
- DECLARE_WRITE8_MEMBER(kbd_put);
UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+
+ DECLARE_WRITE_LINE_MEMBER( usart_clock_tick );
+
private:
- UINT8 m_digit;
- UINT8 m_term_data;
required_device<cpu_device> m_maincpu;
- required_device<generic_terminal_device> m_terminal;
+ required_device<i8251_device> m_usart;
+ required_device<rs232_port_device> m_rs232;
+ required_ioport m_usart_baud_rate;
+
+ UINT8 m_usart_divide_counter;
+ UINT8 m_usart_clock_state;
};
static ADDRESS_MAP_START(sdk80_mem, AS_PROGRAM, 8, sdk80_state)
@@ -65,27 +69,22 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START(sdk80_io, AS_IO, 8, sdk80_state)
ADDRESS_MAP_UNMAP_HIGH
ADDRESS_MAP_GLOBAL_MASK(0xff)
- AM_RANGE(0xec, 0xec) AM_READ(portec_r) AM_DEVWRITE("terminal", generic_terminal_device, write)
- AM_RANGE(0xed, 0xed) AM_READ(ported_r)
- //AM_RANGE(0xec, 0xec) AM_DEVREADWRITE("uart", i8251_device, data_r, data_w)
- //AM_RANGE(0xed, 0xed) AM_DEVREADWRITE("uart", i8251_device, status_r, control_w)
+ AM_RANGE(0xec, 0xec) AM_DEVREADWRITE(I8251A_TAG, i8251_device, data_r, data_w)
+ AM_RANGE(0xed, 0xed) AM_DEVREADWRITE(I8251A_TAG, i8251_device, status_r, control_w)
ADDRESS_MAP_END
static INPUT_PORTS_START( sdk80 )
+ PORT_START(I8251A_BAUD_TAG)
+ PORT_DIPNAME( 0x3f, 0x01, "i8251 Baud Rate" )
+ PORT_DIPSETTING( 0x01, "4800")
+ PORT_DIPSETTING( 0x02, "2400")
+ PORT_DIPSETTING( 0x04, "1200")
+ PORT_DIPSETTING( 0x08, "600")
+ PORT_DIPSETTING( 0x10, "300")
+ PORT_DIPSETTING( 0x20, "150")
+ PORT_DIPSETTING( 0x40, "75")
INPUT_PORTS_END
-READ8_MEMBER( sdk80_state::portec_r )
-{
- UINT8 ret = m_term_data;
- m_term_data = 0;
- return ret;
-}
-
-READ8_MEMBER( sdk80_state::ported_r )
-{
- return (m_term_data) ? 3 : 1;
-}
-
#if 0
/* Graphics Output */
const gfx_layout sdk80_charlayout =
@@ -111,67 +110,37 @@ UINT32 sdk80_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, c
return 0;
}
-WRITE8_MEMBER( sdk80_state::scanlines_w )
-{
- m_digit = data;
-}
-
-WRITE8_MEMBER( sdk80_state::digit_w )
-{
- if (m_digit < 6)
- output_set_digit_value(m_digit, BITSWAP8(data, 3, 2, 1, 0, 7, 6, 5, 4)^0xff);
-}
-
-READ8_MEMBER( sdk80_state::kbd_r )
+WRITE_LINE_MEMBER( sdk80_state::usart_clock_tick )
{
- UINT8 data = 0xff;
+ UINT8 old_counter = m_usart_divide_counter;
+ m_usart_divide_counter++;
- if (m_digit < 3)
+ UINT8 transition = (old_counter ^ m_usart_divide_counter) & m_usart_baud_rate->read();
+ if (transition)
{
- char kbdrow[6];
- sprintf(kbdrow,"X%X",m_digit);
- data = ioport(kbdrow)->read();
+ m_usart->write_txc(m_usart_clock_state);
+ m_usart->write_rxc(m_usart_clock_state);
+ m_usart_clock_state ^= 1;
}
- return data;
-}
-
-WRITE8_MEMBER( sdk80_state::kbd_put )
-{
- m_term_data = data;
}
static MACHINE_CONFIG_START( sdk80, sdk80_state )
/* basic machine hardware */
- MCFG_CPU_ADD("maincpu", I8080A, 500000)
+ MCFG_CPU_ADD("maincpu", I8080A, XTAL_18_432MHz/9)
MCFG_CPU_PROGRAM_MAP(sdk80_mem)
MCFG_CPU_IO_MAP(sdk80_io)
-// MCFG_DEVICE_ADD("uart", I8251, 0)
-// MCFG_I8251_TXD_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_txd))
-// MCFG_I8251_DTR_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_dtr))
-// MCFG_I8251_RTS_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_rts))
-
-// MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "terminal")
-// MCFG_RS232_RXD_HANDLER(DEVWRITELINE("uart", i8251_device, write_rxd))
-// MCFG_RS232_DSR_HANDLER(DEVWRITELINE("uart", i8251_device, write_dsr))
-
-// old references to other drivers have been left in
-// MCFG_DEVICE_ADD("pit8253", PIT8253, 0)
-// MCFG_PIT8253_CLK0(MAIN_CLOCK_X1) /* heartbeat IRQ */
-// MCFG_PIT8253_OUT0_HANDLER(DEVWRITELINE("pic8259_master", pic8259_device, ir0_w))
-// MCFG_PIT8253_CLK1(MAIN_CLOCK_X1) /* Memory Refresh */
-// MCFG_PIT8253_CLK2(MAIN_CLOCK_X1) /* RS-232c */
-// MCFG_PIT8253_OUT2_HANDLER(WRITELINE(pc9801_state, write_uart_clock))
-
-// MCFG_DEVICE_ADD("ppi8255_sys", I8255, 0)
-// MCFG_I8255_IN_PORTA_CB(IOPORT("DSW2"))
-// MCFG_I8255_IN_PORTB_CB(IOPORT("DSW1"))
-// MCFG_I8255_IN_PORTC_CB(CONSTANT(0xa0)) // 0x80 cpu triple fault reset flag?
-// MCFG_I8255_OUT_PORTC_CB(WRITE8(pc9801_state, ppi_sys_portc_w))
-
-// MCFG_DEVICE_ADD("ppi8255_prn", I8255, 0)
- /* TODO: check this one */
-// MCFG_I8255_IN_PORTB_CB(IOPORT("DSW5"))
+ MCFG_DEVICE_ADD(I8251A_TAG, I8251, 0)
+ MCFG_I8251_TXD_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_txd))
+ MCFG_I8251_DTR_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_dtr))
+ MCFG_I8251_RTS_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_rts))
+
+ MCFG_RS232_PORT_ADD(RS232_TAG, default_rs232_devices, "null_modem")
+ MCFG_RS232_RXD_HANDLER(DEVWRITELINE(I8251A_TAG, i8251_device, write_rxd))
+ MCFG_RS232_DSR_HANDLER(DEVWRITELINE(I8251A_TAG, i8251_device, write_dsr))
+
+ MCFG_DEVICE_ADD("usart_clock", CLOCK, XTAL_18_432MHz/60)
+ MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(sdk80_state, usart_clock_tick))
/* video hardware */
// 96364 crt controller
@@ -195,7 +164,7 @@ static MACHINE_CONFIG_START( sdk80, sdk80_state )
// MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")
- // uart
+ // Video board UART
// MCFG_DEVICE_ADD( "hd6402", AY31015, 0 )
// MCFG_AY31015_TX_CLOCK(( XTAL_16MHz / 16 ) / 256)
// MCFG_AY31015_RX_CLOCK(( XTAL_16MHz / 16 ) / 256)
@@ -211,8 +180,8 @@ static MACHINE_CONFIG_START( sdk80, sdk80_state )
// MCFG_I8279_IN_SHIFT_CB(VCC) // Shift key
// MCFG_I8279_IN_CTRL_CB(VCC)
- MCFG_DEVICE_ADD("terminal", GENERIC_TERMINAL, 0)
- MCFG_GENERIC_TERMINAL_KEYBOARD_CB(WRITE8(sdk80_state, kbd_put))
+ //MCFG_DEVICE_ADD("terminal", GENERIC_TERMINAL, 0)
+ //MCFG_GENERIC_TERMINAL_KEYBOARD_CB(WRITE8(sdk80_state, kbd_put))
MACHINE_CONFIG_END
/* ROM definition */