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swtpc: Split into two systems (SWTBUG and MIKBUG)
- Define alternate XTAL for MIKBUG version (nw) - Add RAM configuration and MC14411 device (nw) - Reduce terminal baud rate to the supported maximum of 1200 (nw) - Add notes for future reference (nw)
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@ -58,6 +58,7 @@ enum
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XTAL_1MHz = 1000000, /* Used to drive OKI M6295 chips */
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XTAL_1_2944MHz = 1294400, /* BBN BitGraph PSG */
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XTAL_1_75MHz = 1750000, /* RCA CDP1861 */
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XTAL_1_7971MHz = 1797100, /* SWTPC 6800 (with MIKBUG) */
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XTAL_1_8432MHz = 1843200, /* Bondwell 12/14 */
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XTAL_1_9968MHz = 1996800, /* NEC PC-98xx */
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XTAL_2MHz = 2000000,
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@ -2,20 +2,27 @@
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// copyright-holders:Robbbert
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/***************************************************************************
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SWTPC 6800
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SWTPC 6800 Computer System
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10/12/2009 Skeleton driver.
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http://www.swtpc.com/mholley/swtpc_6800.htm
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bios 0 (SWTBUG) is made for a PIA (parallel) interface.
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bios 1 (MIKBUG) is made for a ACIA (serial) interface at the same address.
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MIKBUG is made for a PIA (parallel) interface.
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SWTBUG is made for a ACIA (serial) interface at the same address.
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MIKBUG will actually read the bits as they arrive and assemble a byte.
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Its delay loops are based on an underclocked XTAL.
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Note: All commands must be in uppercase. See the SWTBUG manual.
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ToDo:
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- Split into 2 systems each with different hardware.
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- Support selectable baud rate clocks (110, 150, 300, 600, 1200)
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- Implement interface bus slots to allow selection of either MP-S
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(ACIA) or MP-C or MP-L (PIA) for I/O slot #1 or seven other
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fixed-address I/O slots
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- Add DC-4 (WD1797 FDC) interface board as I/O slot option
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- Emulate MP-A2 revision of CPU board, with four 2716 ROM sockets
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and allowance for extra RAM boards at A000-BFFF and C000-DFFF
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Commands:
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@ -38,7 +45,8 @@ Z Goto Prom (0xC000)
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#include "emu.h"
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#include "cpu/m6800/m6800.h"
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#include "machine/6850acia.h"
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#include "machine/clock.h"
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#include "machine/mc14411.h"
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#include "machine/ram.h"
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#include "bus/rs232/rs232.h"
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class swtpc_state : public driver_device
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@ -47,54 +55,94 @@ public:
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swtpc_state(const machine_config &mconfig, device_type type, const char *tag)
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: driver_device(mconfig, type, tag)
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, m_maincpu(*this, "maincpu")
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, m_ram(*this, "ram")
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, m_brg(*this, "brg")
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{ }
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virtual void machine_start() override;
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private:
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required_device<cpu_device> m_maincpu;
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required_device<ram_device> m_ram;
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required_device<mc14411_device> m_brg;
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};
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static ADDRESS_MAP_START(mem_map, AS_PROGRAM, 8, swtpc_state)
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ADDRESS_MAP_UNMAP_HIGH
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AM_RANGE(0x8004, 0x8004) AM_MIRROR(2) AM_DEVREADWRITE("uart", acia6850_device, status_r, control_w)
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AM_RANGE(0x8005, 0x8005) AM_MIRROR(2) AM_DEVREADWRITE("uart", acia6850_device, data_r, data_w)
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AM_RANGE(0xa000, 0xa07f) AM_RAM
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AM_RANGE(0xe000, 0xe3ff) AM_MIRROR(0x1c00) AM_ROM
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AM_RANGE(0x8004, 0x8004) AM_MIRROR(2) AM_DEVREADWRITE("acia", acia6850_device, status_r, control_w)
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AM_RANGE(0x8005, 0x8005) AM_MIRROR(2) AM_DEVREADWRITE("acia", acia6850_device, data_r, data_w)
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AM_RANGE(0xa000, 0xa07f) AM_RAM // MCM6810
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AM_RANGE(0xe000, 0xe3ff) AM_MIRROR(0x1c00) AM_ROM AM_REGION("mcm6830", 0)
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ADDRESS_MAP_END
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/* Input ports */
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static INPUT_PORTS_START( swtpc )
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INPUT_PORTS_END
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static DEVICE_INPUT_DEFAULTS_START( terminal )
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DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_1200 )
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DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_1200 )
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DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 )
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DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_8 )
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DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_NONE )
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DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_1 )
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DEVICE_INPUT_DEFAULTS_END
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void swtpc_state::machine_start()
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{
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m_brg->rsa_w(0);
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m_brg->rsb_w(1);
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m_maincpu->space(AS_PROGRAM).install_ram(0, m_ram->size() - 1, m_ram->pointer());
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}
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static MACHINE_CONFIG_START( swtpc )
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/* basic machine hardware */
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MCFG_CPU_ADD("maincpu", M6800, XTAL_1MHz)
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MCFG_CPU_ADD("maincpu", M6800, XTAL_1_8432MHz / 2)
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MCFG_CPU_PROGRAM_MAP(mem_map)
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/* video hardware */
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MCFG_DEVICE_ADD("uart_clock", CLOCK, 153600)
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MCFG_CLOCK_SIGNAL_HANDLER(DEVWRITELINE("uart", acia6850_device, write_txc))
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MCFG_DEVCB_CHAIN_OUTPUT(DEVWRITELINE("uart", acia6850_device, write_rxc))
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MCFG_DEVICE_ADD("brg", MC14411, XTAL_1_8432MHz)
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MCFG_MC14411_F7_CB(DEVWRITELINE("acia", acia6850_device, write_txc))
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MCFG_DEVCB_CHAIN_OUTPUT(DEVWRITELINE("acia", acia6850_device, write_rxc))
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// F8, F9, F11, F13 also present on system bus
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MCFG_DEVICE_ADD("uart", ACIA6850, XTAL_1MHz)
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MCFG_DEVICE_ADD("acia", ACIA6850, 0)
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MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_txd))
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MCFG_ACIA6850_RTS_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_rts))
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MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "terminal")
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MCFG_RS232_RXD_HANDLER(DEVWRITELINE("uart", acia6850_device, write_rxd))
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MCFG_RS232_CTS_HANDLER(DEVWRITELINE("uart", acia6850_device, write_cts))
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MCFG_RS232_RXD_HANDLER(DEVWRITELINE("acia", acia6850_device, write_rxd))
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MCFG_RS232_CTS_HANDLER(DEVWRITELINE("acia", acia6850_device, write_cts))
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MCFG_DEVICE_CARD_DEVICE_INPUT_DEFAULTS("terminal", terminal)
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MCFG_RAM_ADD(RAM_TAG)
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MCFG_RAM_DEFAULT_SIZE("2K")
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MCFG_RAM_EXTRA_OPTIONS("4K,8K,12K,16K,20K,24K,28K,32K")
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MACHINE_CONFIG_END
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static MACHINE_CONFIG_DERIVED( swtpcm, swtpc )
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MCFG_CPU_MODIFY("maincpu")
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MCFG_CPU_CLOCK(XTAL_1_7971MHz / 2)
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MCFG_DEVICE_MODIFY("brg")
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MCFG_DEVICE_CLOCK(XTAL_1_7971MHz)
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MACHINE_CONFIG_END
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/* ROM definition */
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ROM_START( swtpc )
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ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
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ROM_SYSTEM_BIOS( 0, "swt", "SWTBUG" )
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ROMX_LOAD( "swtbug.bin", 0xe000, 0x0400, CRC(f9130ef4) SHA1(089b2d2a56ce9526c3e78ce5d49ce368b9eabc0c), ROM_BIOS(1))
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ROM_SYSTEM_BIOS( 1, "mik", "MIKBUG" )
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ROMX_LOAD( "mikbug.bin", 0xe000, 0x0400, CRC(e7f4d9d0) SHA1(5ad585218f9c9c70f38b3c74e3ed5dfe0357621c), ROM_BIOS(2))
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ROM_REGION( 0x0400, "mcm6830", 0 )
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ROM_LOAD("swtbug.bin", 0x0000, 0x0400, CRC(f9130ef4) SHA1(089b2d2a56ce9526c3e78ce5d49ce368b9eabc0c))
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ROM_END
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ROM_START( swtpcm )
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ROM_REGION( 0x0400, "mcm6830", 0 )
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ROM_LOAD("mikbug.bin", 0x0000, 0x0400, CRC(e7f4d9d0) SHA1(5ad585218f9c9c70f38b3c74e3ed5dfe0357621c))
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ROM_END
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/* Driver */
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// YEAR NAME PARENT COMPAT MACHINE INPUT STATE INIT COMPANY FULLNAME FLAGS
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COMP( 1975, swtpc, 0, 0, swtpc, swtpc, swtpc_state, 0, "Southwest Technical Products Corporation", "SWTPC 6800", MACHINE_NO_SOUND_HW )
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COMP( 1977, swtpc, 0, 0, swtpc, swtpc, swtpc_state, 0, "Southwest Technical Products Corporation", "SWTPC 6800 Computer System (with SWTBUG)", MACHINE_NO_SOUND_HW )
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COMP( 1975, swtpcm, swtpc, 0, swtpcm, swtpc, swtpc_state, 0, "Southwest Technical Products Corporation", "SWTPC 6800 Computer System (with MIKBUG)", MACHINE_NO_SOUND_HW | MACHINE_NOT_WORKING )
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@ -35566,6 +35566,7 @@ svmu // 1998 Sega Visual Memory Unit
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@source:swtpc.cpp
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swtpc //
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swtpcm //
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@source:swtpc09.cpp
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swtpc09 // S09, DMF2 Floppy SBUG rom - FLEX
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