// license:BSD-3-Clause // copyright-holders:Nigel Barnes // thanks-to:Phill Harvey-Smith /*************************************************************************** CMS 6502 Development System This is an industrial 6502 system in a rack chassis consisting of a back-plane and plug-in cards, with two 3.5" floppy disk drives, a "SIMON" System Monitor, DFS, and an extended version of BBC BASIC called MULTI-BASIC. It has an IBM-XT style keyboard. The "Eurocard" standard format cards are as follows: - 6502 2nd Processor For The BBC Micro (CMS0026 6502) - 40/80 Terminal Card (also handles the keyboard) (CMS 0010-3) - High Performance Colour Graphics Card (CMS Video-4) - Versatile Interface Board (CMS0006 Issue 4) - Analogue Digital Interface Board (CMS00092 A/D I/O) - Floppy Disk Controller System I/O Allocation &FA00-&FBFF Advanced graphics card &FC00-&FC0F CPU card VIA &FC10-&FC1F GDP card control register &FC20-&FC2F GDP card colour register &FC30-&FC3F Real-Time-Clock registers (EM M3002) &FC40-&FC4F Disc controller registers &FC50-&FC5F Disc controller drive select register &FC60-&FC6F IEEE controller card &FC70-&FC7F Memory select register (on CPU card) &FC80-&FC8F VIA1 on VIB card &FC90-&FC9F VIA2 on VIB card &FCA0-&FCAF VIA3 on VIB card &FCB0-&FCBF VIA4 on VIB card (Printer interface) &FCC0-&FCCF Analogue card ADC &FCD0-&FCDF Analogue card DAC &FCE0-&FCEF Analogue card VIA &FCF0-&FCFF Serial Interface on VIB card &FD00-&FD1F Reserved &FD20-&FD2F 40/80 column card video processor &FD30-&FD3F 40/80 column card VIA (printer interface) &FD40-&FD4F 40/80 column card serial interface &FD50-&FD5F Reserved for future I/O cards ****************************************************************************/ #include "emu.h" #include "cpu/m6502/m6502.h" #include "machine/6522via.h" #include "machine/input_merger.h" #include "machine/m3002.h" #include "bus/acorn/bus.h" class cms_state : public driver_device { public: cms_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") , m_rom(*this, "rom") , m_bank1(*this, "bank1") , m_via(*this, "via") , m_irqs(*this, "irqs") , m_bus(*this, "bus") , m_map_select(0) { } void cms6502(machine_config &config); protected: virtual void machine_start() override; virtual void machine_reset() override; private: void map_select_w(uint8_t data); void page_select_w(uint8_t data); DECLARE_WRITE_LINE_MEMBER(bus_nmi_w); required_device m_maincpu; required_memory_region m_rom; required_memory_bank m_bank1; required_device m_via; required_device m_irqs; required_device m_bus; void cms6502_mem(address_map &map); uint8_t m_map_select; uint8_t m_page_select[4]; }; void cms_state::cms6502_mem(address_map &map) { map.unmap_value_high(); map(0x0000, 0x7fff).ram(); /* socket M1 43256C-12 32K RAM */ map(0x8000, 0xbfff).bankr("bank1").w(FUNC(cms_state::page_select_w)); map(0xc000, 0xffff).rom().region("mos", 0); map(0xfc00, 0xfc0f).m(m_via, FUNC(via6522_device::map)); map(0xfc30, 0xfc30).mirror(0xf).rw("rtc", FUNC(m3002_device::read), FUNC(m3002_device::write)); map(0xfc70, 0xfc7f).w(FUNC(cms_state::map_select_w)); } void cms_state::map_select_w( uint8_t data) { m_map_select = data & 0x03; m_bank1->set_entry((m_map_select << 2) | m_page_select[m_map_select]); } void cms_state::page_select_w(uint8_t data) { /* 27513 in socket M4 (map 0) */ if (m_map_select == 0x00) { m_page_select[m_map_select] = data & 0x03; } m_bank1->set_entry((m_map_select << 2) | m_page_select[m_map_select]); } /* Input ports */ static INPUT_PORTS_START( cms ) INPUT_PORTS_END void cms_state::machine_start() { m_bank1->configure_entries(0, 16, m_rom->base(), 0x4000); /* register for save states */ save_item(NAME(m_map_select)); save_item(NAME(m_page_select)); } void cms_state::machine_reset() { m_map_select = 0x00; for (int i = 0; i < 4; i++) { m_page_select[i] = 0x00; } m_bank1->set_entry(0); } WRITE_LINE_MEMBER(cms_state::bus_nmi_w) { m_maincpu->set_input_line(INPUT_LINE_NMI, state); } /*************************************************************************** MACHINE DRIVERS ***************************************************************************/ void cms_state::cms6502(machine_config &config) { M6502(config, m_maincpu, 1_MHz_XTAL); m_maincpu->set_addrmap(AS_PROGRAM, &cms_state::cms6502_mem); INPUT_MERGER_ANY_HIGH(config, m_irqs).output_handler().set_inputline(m_maincpu, M6502_IRQ_LINE); MOS6522(config, m_via, 1_MHz_XTAL); m_via->irq_handler().set("irqs", FUNC(input_merger_device::in_w<0>)); M3002(config, "rtc", 32.768_kHz_XTAL); /* 7 Slot Backplane */ ACORN_BUS(config, m_bus, 0); m_bus->set_space(m_maincpu, AS_PROGRAM); m_bus->out_irq_callback().set(m_irqs, FUNC(input_merger_device::in_w<1>)); m_bus->out_nmi_callback().set(FUNC(cms_state::bus_nmi_w)); ACORN_BUS_SLOT(config, "bus1", m_bus, cms_bus_devices, "4080term"); ACORN_BUS_SLOT(config, "bus2", m_bus, cms_bus_devices, nullptr); ACORN_BUS_SLOT(config, "bus3", m_bus, cms_bus_devices, "fdc"); ACORN_BUS_SLOT(config, "bus4", m_bus, cms_bus_devices, "hires"); ACORN_BUS_SLOT(config, "bus5", m_bus, cms_bus_devices, nullptr); ACORN_BUS_SLOT(config, "bus6", m_bus, cms_bus_devices, nullptr); } /*************************************************************************** ROM definitions ***************************************************************************/ ROM_START( cms6502 ) ROM_REGION(0x04000, "mos", 0) /* 27128 */ ROM_LOAD("6502 system os.m5", 0x0000, 0x4000, CRC(1b6da63d) SHA1(5c0afc55288ad86e1d6e653dda9c5dcccdaf0ff2)) ROM_REGION(0x40000, "rom", 0) /* Socket M4 27513 */ ROM_LOAD("basic.m4", 0x00000, 0x4000, CRC(e27b6146) SHA1(ae89ee695bed6f49402f009ded16ad3a36f64c28)) ROM_LOAD("dfs-1.4.m4", 0x04000, 0x4000, CRC(0743ddb5) SHA1(cd61956a10510a6954cba9ba17f70c2991e81d9b)) ROM_LOAD("multi-basic.m4", 0x08000, 0x4000, CRC(fb785563) SHA1(9f97582ba0b82f314008bf95eacb00e7bced3cac)) ROM_LOAD("simon-2.02.m4", 0x0c000, 0x4000, CRC(d1f1b633) SHA1(991c3691a70f45fff3c828c8c0a0906b9f5e34fc)) /* Socket M3 empty */ /* Socket M2 27128 */ ROM_LOAD("gdp.m2", 0x20000, 0x4000, CRC(f545293b) SHA1(532c45ac4661643c6c6f633d504ef72e800cc900)) /* Socket M1 contains RAM, not mapped as ROM */ ROM_REGION(0x200, "proms", 0) ROM_LOAD("bassys2.ic8", 0x0000, 0x0200, CRC(417ff0b4) SHA1(878718accb83f18456fefaf67a0e4a6a407113e4)) // 512x8 ROM_END /* Driver */ /* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */ COMP( 1986, cms6502, 0, 0, cms6502, cms, cms_state, empty_init, "Cambridge Microprocessor Systems", "CMS 6502 Development System", MACHINE_NO_SOUND_HW )