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path: root/src/mame/drivers/sdk80.c
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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes,Ryan Holtz
/***************************************************************************

        Intel SDK-80

This is an evaluation kit for the 8080 cpu.

There is no speaker or storage facility in the standard kit.

Download the User Manual to get the operating procedures.

Monitor Commands:
D  Display memory contents
G  Go to address (execute program at address)
I  Insert hex code
M  Move blocks of memory
S  Substitute memory locations
X  Examine registers

Please note this rom set boots into BASIC, not monitor.

****************************************************************************/

#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "machine/i8251.h"
#include "machine/clock.h"
#include "bus/rs232/rs232.h"
//#include "machine/ay31015.h"

#define I8251A_TAG      "usart"
#define I8251A_BAUD_TAG "usart_baud"
#define RS232_TAG       "rs232"

class sdk80_state : public driver_device
{
public:
	sdk80_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, 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)
	{ }

	UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

	DECLARE_WRITE_LINE_MEMBER( usart_clock_tick );

private:
	required_device<cpu_device> m_maincpu;
	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)
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x0000, 0x0fff) AM_ROM
	AM_RANGE(0x3c00, 0x3fff) AM_RAM
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_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

#if 0
/* Graphics Output */
const gfx_layout sdk80_charlayout =
{
	7, 8,               /* character cell is 7 pixels wide by 8 pixels high */
	64,                 /* 64 characters in 2513 character generator ROM */
	1,                  /* 1 bitplane */
	{ 0 },
	/* 5 visible pixels per row, starting at bit 3, with MSB being 0: */
	{ 3, 4, 5, 6, 7 },
	/* pixel rows stored from top to bottom: */
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
	8 * 8               /* 8 8-bit pixel rows per character */
};

static GFXDECODE_START( sdk80 )
	GFXDECODE_ENTRY( "gfx1", 0x0000, sdk80_charlayout, 0, 1 )
GFXDECODE_END
#endif

UINT32 sdk80_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	return 0;
}

WRITE_LINE_MEMBER( sdk80_state::usart_clock_tick )
{
	UINT8 old_counter = m_usart_divide_counter;
	m_usart_divide_counter++;

	UINT8 transition = (old_counter ^ m_usart_divide_counter) & m_usart_baud_rate->read();
	if (transition)
	{
		m_usart->write_txc(m_usart_clock_state);
		m_usart->write_rxc(m_usart_clock_state);
		m_usart_clock_state ^= 1;
	}
}

static MACHINE_CONFIG_START( sdk80, sdk80_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", I8080A, XTAL_18_432MHz/9)
	MCFG_CPU_PROGRAM_MAP(sdk80_mem)
	MCFG_CPU_IO_MAP(sdk80_io)

	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

//  MCFG_SCREEN_ADD("screen", RASTER)
//  MCFG_SCREEN_REFRESH_RATE(60)
	/* Video is blanked for 70 out of 262 scanlines per refresh cycle.
	   Each scanline is composed of 65 character times, 40 of which
	   are visible, and each character time is 7 dot times; a dot time
	   is 2 cycles of the fundamental 14.31818 MHz oscillator.  The
	   total blanking time is about 4450 microseconds. */
//  MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC((int) (70 * 65 * 7 * 2 / 14.31818)))
	/* It would be nice if we could implement some sort of display
	   overscan here. */
//  MCFG_SCREEN_SIZE(40 * 7, 24 * 8)
//  MCFG_SCREEN_VISIBLE_AREA(0, 40 * 7 - 1, 0, 24 * 8 - 1)
//  MCFG_SCREEN_UPDATE_DRIVER(sdk80_state, screen_update)
//  MCFG_SCREEN_PALETTE("palette")

//  MCFG_GFXDECODE_ADD("gfxdecode", "palette", sdk80)

//  MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")

	// 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)
//  MCFG_AY51013_READ_SI_CB(READ8(sdk80_state, nascom1_hd6402_si))
//  MCFG_AY51013_WRITE_SO_CB(WRITE8(sdk80_state, nascom1_hd6402_so))

	/* Devices */
//  MCFG_DEVICE_ADD("i8279", I8279, 3100000) // based on divider
//  MCFG_I8279_OUT_IRQ_CB(INPUTLINE("maincpu", I8085_RST55_LINE))   // irq
//  MCFG_I8279_OUT_SL_CB(WRITE8(sdk80_state, scanlines_w))          // scan SL lines
//  MCFG_I8279_OUT_DISP_CB(WRITE8(sdk80_state, digit_w))            // display A&B
//  MCFG_I8279_IN_RL_CB(READ8(sdk80_state, kbd_r))                  // kbd RL lines
//  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))
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( sdk80 )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "basic_blc_1.a14", 0x0000, 0x0400, CRC(b5e75aee) SHA1(6bd1eb9586d72544e8afb4ae43ecedcefa14da33))
	ROM_LOAD( "basic_blc_2.a15", 0x0400, 0x0400, CRC(0a9ad1ed) SHA1(92c47eadcf8b18eeedcccaa3deb9f1518aaceeae))
	ROM_LOAD( "basic_blc_3.a16", 0x0800, 0x0400, CRC(bc898e4b) SHA1(adc000534db0f736a75fbceed360dc220e02c30d))
	ROM_LOAD( "basic_blc_4.a17", 0x0c00, 0x0400, CRC(568e8b6d) SHA1(22960193d3b0ae1b5d876d8c3b3f3b40db01358c))

	/* 512-byte Signetics 2513 character generator ROM at location D2-D3 */
	ROM_REGION(0x0200, "gfx1",0)
	ROM_LOAD("s2513.d2", 0x0000, 0x0200, CRC(a7e567fc) SHA1(b18aae0a2d4f92f5a7e22640719bbc4652f3f4ee))

	/* 256x4 PROM located on the video board, schematic location P7, to be moved into separate device later */
	ROM_REGION( 0x0120, "proms", 0 )
	ROM_LOAD( "6300__d7.p7",    0x0020, 0x0100, CRC(3eb3a8e4) SHA1(19097b5f60d1030f8b82d9f1d3a241f93e5c75d6) )
ROM_END

/*    YEAR  NAME    PARENT  COMPAT  MACHINE    INPUT   CLASS           INIT   COMPANY   FULLNAME  FLAGS */
COMP( 1975, sdk80,  0,       0,     sdk80,     sdk80,  driver_device,  0,     "Intel",  "SDK-80", MACHINE_NO_SOUND_HW )