// license:BSD-3-Clause // copyright-holders:Robbbert /************************************************************************************************************ Telcon Industries/Modular Micros/Gemini Electronics Zorba http://www.zorba.z80.de 2013-08-25 Skeleton 2015-02-20 Boots from floppy, is now usable. This was one of the last CP/M-based systems, already out of date when it was released. Because it doesn't use the standard Z80 peripherals, it uses a homebrew interrupt controller to make use of the Z80's IM2. The keyboard is an intelligent serial device like the Kaypro's keyboard. They even have the same plug, and might be swappable. Need a schematic. Instead of using a daisy chain, the IM2 vectors are calculated by a prom (u77). Unfortunately, the prom contents make no sense at all (mostly FF), so the vectors for IRQ0 and IRQ2 are hard-coded. Other IRQ vectors are not used as yet. Three companies are known to have sold the Zorba over its lifetime: Telcon Industries, Modular Micros (a subsidiary of Modular Computers (ModComp)), and Gemini Electronics. 7-inch and 9-inch models were available from Telcon and Modular Micros, while Gemini exclusively sold the 9-inch version. The ROM dumps currently used in this emulation originate from a Modular Micros Zorba. The two versions of the Zorba were sold by Modular Micros were: - Zorba 7: 7" CRT, 2 410K floppies, 22 lbs, $1595 - Zorba 2000: 9" CRT, 2 820K floppies, 10M HD optional, 25 lbs, ~$2000 The 7-inch version has the screen on the left, the floppy drives on the right, and a Zorba logo on the far right; on the 9-inch version this arrangement is reversed and the logo is removed. The startup screen varies across each company: - Telcon: "TELCON ZORBA" graphical logo - Modular Micros: "ZORBA" graphical logo with "MODULAR MICROS, INC." below in normal text - Gemini: "GEMINI ZORBA" graphical logo Status: - Boots up, and the keyboard works ToDo: - Need software that does more than plain text (such as games) - Add masking feature (only used for the UARTs) - Connect devices to the above hardware - Fix the display - Connect the PIT to the UARTs - Replace the ascii keyboard with the real one, if possible - Dump Telcon and Gemini BIOSes - Emulate the Co-Power-88 expansion (allows PC-DOS, CP/M-86, etc. to be used) - Probably lots of other things *************************************************************************************************************/ #include "emu.h" #include "cpu/z80/z80.h" #include "cpu/m6805/m6805.h" #include "machine/i8251.h" #include "machine/6821pia.h" #include "machine/z80dma.h" #include "machine/pit8253.h" #include "video/i8275.h" #include "sound/beep.h" #include "machine/keyboard.h" #include "machine/wd_fdc.h" #include "softlist.h" class zorba_state : public driver_device { public: zorba_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_palette(*this, "palette") , m_maincpu(*this, "maincpu") , m_beep(*this, "beeper") , m_dma(*this, "dma") , m_u0(*this, "uart0") , m_u1(*this, "uart1") , m_u2(*this, "uart2") , m_pia0(*this, "pia0") , m_pia1(*this, "pia1") , m_crtc(*this, "crtc") , m_fdc (*this, "fdc") , m_floppy0(*this, "fdc:0") , m_floppy1(*this, "fdc:1") {} public: const uint8_t *m_p_chargen; DECLARE_DRIVER_INIT(zorba); DECLARE_MACHINE_RESET(zorba); DECLARE_READ8_MEMBER(ram_r); DECLARE_WRITE8_MEMBER(ram_w); DECLARE_READ8_MEMBER(rom_r); DECLARE_WRITE8_MEMBER(rom_w); DECLARE_WRITE8_MEMBER(intmask_w); DECLARE_WRITE_LINE_MEMBER(busreq_w); DECLARE_READ8_MEMBER(memory_read_byte); DECLARE_WRITE8_MEMBER(memory_write_byte); DECLARE_READ8_MEMBER(io_read_byte); DECLARE_WRITE8_MEMBER(io_write_byte); DECLARE_WRITE8_MEMBER(pia0_porta_w); DECLARE_WRITE8_MEMBER(kbd_put); DECLARE_READ8_MEMBER(keyboard_r); DECLARE_WRITE_LINE_MEMBER(irq0_w); DECLARE_WRITE_LINE_MEMBER(fdc_drq_w); DECLARE_WRITE_LINE_MEMBER(fdc_intrq_w); I8275_DRAW_CHARACTER_MEMBER(zorba_update_chr); required_device m_palette; private: uint8_t m_term_data; uint8_t m_fdc_rq; required_device m_maincpu; required_device m_beep; required_device m_dma; required_device m_u0; required_device m_u1; required_device m_u2; required_device m_pia0; required_device m_pia1; required_device m_crtc; required_device m_fdc; required_device m_floppy0; required_device m_floppy1; }; static ADDRESS_MAP_START( zorba_mem, AS_PROGRAM, 8, zorba_state ) AM_RANGE( 0x0000, 0x3fff ) AM_READ_BANK("bankr0") AM_WRITE_BANK("bankw0") AM_RANGE( 0x4000, 0xffff ) AM_RAM ADDRESS_MAP_END static ADDRESS_MAP_START( zorba_kbdmem, AS_PROGRAM, 8, zorba_state ) ADDRESS_MAP_GLOBAL_MASK(0x7ff) AM_RANGE( 0x000, 0x07f ) AM_RAM // internal RAM AM_RANGE( 0x080, 0x7ff ) AM_ROM // internal EPROM ADDRESS_MAP_END static ADDRESS_MAP_START( zorba_io, AS_IO, 8, zorba_state ) ADDRESS_MAP_GLOBAL_MASK(0xff) AM_RANGE(0x00, 0x03) AM_DEVREADWRITE("pit", pit8254_device, read, write) AM_RANGE(0x04, 0x04) AM_READWRITE(rom_r,rom_w) AM_RANGE(0x05, 0x05) AM_READWRITE(ram_r,ram_w) AM_RANGE(0x10, 0x11) AM_DEVREADWRITE("crtc", i8275_device, read, write) AM_RANGE(0x20, 0x20) AM_DEVREADWRITE("uart0", i8251_device, data_r, data_w) AM_RANGE(0x21, 0x21) AM_DEVREADWRITE("uart0", i8251_device, status_r, control_w) AM_RANGE(0x22, 0x22) AM_DEVREADWRITE("uart1", i8251_device, data_r, data_w) AM_RANGE(0x23, 0x23) AM_DEVREADWRITE("uart1", i8251_device, status_r, control_w) //AM_RANGE(0x24, 0x24) AM_DEVREADWRITE("uart2", i8251_device, data_r, data_w) //AM_RANGE(0x25, 0x25) AM_DEVREADWRITE("uart2", i8251_device, status_r, control_w) AM_RANGE(0x24, 0x25) AM_READ(keyboard_r) AM_WRITENOP AM_RANGE(0x26, 0x26) AM_WRITE(intmask_w) AM_RANGE(0x30, 0x30) AM_DEVREADWRITE("dma", z80dma_device, read, write) AM_RANGE(0x40, 0x43) AM_DEVREADWRITE("fdc", fd1793_t, read, write) AM_RANGE(0x50, 0x53) AM_DEVREADWRITE("pia0", pia6821_device, read, write) AM_RANGE(0x60, 0x63) AM_DEVREADWRITE("pia1", pia6821_device, read, write) ADDRESS_MAP_END READ8_MEMBER( zorba_state::ram_r ) { membank("bankr0")->set_entry(0); return 0; } WRITE8_MEMBER( zorba_state::ram_w ) { membank("bankr0")->set_entry(0); } READ8_MEMBER( zorba_state::rom_r ) { membank("bankr0")->set_entry(1); return 0; } WRITE8_MEMBER( zorba_state::rom_w ) { membank("bankr0")->set_entry(1); } WRITE_LINE_MEMBER( zorba_state::irq0_w ) { if (state) { m_maincpu->set_input_line_vector(0, 0x88); m_maincpu->set_input_line(0, ASSERT_LINE); } else m_maincpu->set_input_line(0, CLEAR_LINE); } WRITE_LINE_MEMBER( zorba_state::fdc_intrq_w ) { m_fdc_rq = (m_fdc_rq & 2) | state; if (m_fdc_rq == 1) { m_maincpu->set_input_line_vector(0, 0x80); m_maincpu->set_input_line(0, ASSERT_LINE); } else if (m_fdc_rq == 0) m_maincpu->set_input_line(0, CLEAR_LINE); } WRITE_LINE_MEMBER( zorba_state::fdc_drq_w ) { m_fdc_rq = (m_fdc_rq & 1) | (state << 1); if (m_fdc_rq == 2) { m_maincpu->set_input_line_vector(0, 0x80); m_maincpu->set_input_line(0, ASSERT_LINE); } else if (m_fdc_rq == 0) m_maincpu->set_input_line(0, CLEAR_LINE); } WRITE8_MEMBER( zorba_state::intmask_w ) { } static INPUT_PORTS_START( zorba ) INPUT_PORTS_END DRIVER_INIT_MEMBER( zorba_state, zorba ) { uint8_t *main = memregion("maincpu")->base(); membank("bankr0")->configure_entry(0, &main[0x0000]); membank("bankr0")->configure_entry(1, &main[0x10000]); membank("bankw0")->configure_entry(0, &main[0x0000]); } //------------------------------------------------- // Z80DMA //------------------------------------------------- WRITE_LINE_MEMBER( zorba_state::busreq_w ) { // since our Z80 has no support for BUSACK, we assume it is granted immediately m_maincpu->set_input_line(Z80_INPUT_LINE_BUSRQ, state); m_dma->bai_w(state); // tell dma that bus has been granted } READ8_MEMBER(zorba_state::memory_read_byte) { address_space& prog_space = m_maincpu->space(AS_PROGRAM); return prog_space.read_byte(offset); } WRITE8_MEMBER(zorba_state::memory_write_byte) { address_space& prog_space = m_maincpu->space(AS_PROGRAM); prog_space.write_byte(offset, data); } READ8_MEMBER(zorba_state::io_read_byte) { address_space& prog_space = m_maincpu->space(AS_IO); return prog_space.read_byte(offset); } WRITE8_MEMBER(zorba_state::io_write_byte) { address_space& prog_space = m_maincpu->space(AS_IO); if (offset == 0x10) { m_crtc->dack_w(space, 0, data); } else { prog_space.write_byte(offset, data); } } static SLOT_INTERFACE_START( zorba_floppies ) SLOT_INTERFACE( "525dd", FLOPPY_525_DD ) SLOT_INTERFACE_END WRITE8_MEMBER( zorba_state::pia0_porta_w ) { m_beep->set_state(BIT(data, 7)); m_fdc->dden_w(BIT(data, 6)); floppy_image_device *floppy = nullptr; if (!BIT(data, 0)) floppy = m_floppy0->get_device(); if (!BIT(data, 1)) floppy = m_floppy1->get_device(); m_fdc->set_floppy(floppy); if (floppy) floppy->ss_w(!BIT(data, 5)); m_floppy0->get_device()->mon_w(BIT(data, 4)); m_floppy1->get_device()->mon_w(BIT(data, 4)); } I8275_DRAW_CHARACTER_MEMBER( zorba_state::zorba_update_chr ) { int i; const rgb_t *palette = m_palette->palette()->entry_list_raw(); uint8_t gfx = m_p_chargen[(linecount & 15) + (charcode << 4) + ((gpa & 1) << 11)]; if (vsp) gfx = 0; if (lten) gfx = 0xff; if (rvv) gfx ^= 0xff; for(i=0;i<8;i++) bitmap.pix32(y, x + 7 - i) = palette[BIT(gfx, i) ? (hlgt ? 2 : 1) : 0]; } /* F4 Character Displayer */ static const gfx_layout u5_charlayout = { 8, 11, /* 8 x 11 characters */ 256, /* 256 characters */ 1, /* 1 bits per pixel */ { 0 }, /* no bitplanes */ /* x offsets */ { 0, 1, 2, 3, 4, 5, 6, 7 }, /* y offsets */ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8 }, 8*16 /* every char takes 16 bytes */ }; static GFXDECODE_START( zorba ) GFXDECODE_ENTRY( "chargen", 0x0000, u5_charlayout, 0, 1 ) GFXDECODE_END MACHINE_RESET_MEMBER( zorba_state, zorba ) { m_fdc_rq = 0; m_p_chargen = memregion("chargen")->base(); membank("bankr0")->set_entry(1); // point at rom membank("bankw0")->set_entry(0); // always write to ram m_maincpu->reset(); } READ8_MEMBER( zorba_state::keyboard_r ) { if (offset) return (m_term_data) ? 0x87 : 0x85; uint8_t data = m_term_data; m_term_data = 0; return data; } WRITE8_MEMBER( zorba_state::kbd_put ) { m_term_data = data; } static MACHINE_CONFIG_START( zorba, zorba_state ) // basic machine hardware MCFG_CPU_ADD("maincpu", Z80, XTAL_24MHz / 6) MCFG_CPU_PROGRAM_MAP(zorba_mem) MCFG_CPU_IO_MAP(zorba_io) MCFG_MACHINE_RESET_OVERRIDE(zorba_state, zorba) /* keyboard */ MCFG_CPU_ADD("kbdcpu", M68705, XTAL_3_579545MHz) // MC68705P3S (0x80 bytes ram, 0x780 bytes of rom) MCFG_CPU_PROGRAM_MAP(zorba_kbdmem) /* video hardware */ MCFG_SCREEN_ADD_MONOCHROME("screen", RASTER, rgb_t::green()) MCFG_SCREEN_REFRESH_RATE(50) MCFG_SCREEN_UPDATE_DEVICE("crtc", i8275_device, screen_update) MCFG_GFXDECODE_ADD("gfxdecode", "palette", zorba) MCFG_PALETTE_ADD_MONOCHROME_HIGHLIGHT("palette") /* sound hardware */ MCFG_SPEAKER_STANDARD_MONO("mono") MCFG_SOUND_ADD("beeper", BEEP, 800) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) /* devices */ MCFG_DEVICE_ADD("dma", Z80DMA, XTAL_24MHz/6) // busack on cpu connects to bai pin MCFG_Z80DMA_OUT_BUSREQ_CB(WRITELINE(zorba_state, busreq_w)) //connects to busreq on cpu MCFG_Z80DMA_OUT_INT_CB(WRITELINE(zorba_state, irq0_w)) // connects to IRQ0 on IM2 controller //ba0 - not connected MCFG_Z80DMA_IN_MREQ_CB(READ8(zorba_state, memory_read_byte)) MCFG_Z80DMA_OUT_MREQ_CB(WRITE8(zorba_state, memory_write_byte)) MCFG_Z80DMA_IN_IORQ_CB(READ8(zorba_state, io_read_byte)) MCFG_Z80DMA_OUT_IORQ_CB(WRITE8(zorba_state, io_write_byte)) MCFG_DEVICE_ADD("uart0", I8251, 0) // U32 COM port J2 MCFG_DEVICE_ADD("uart1", I8251, 0) // U31 printer port J3 MCFG_DEVICE_ADD("uart2", I8251, 0) // U30 serial keyboard J6 // port A - disk select etc, beeper // port B - parallel interface MCFG_DEVICE_ADD("pia0", PIA6821, 0) MCFG_PIA_WRITEPA_HANDLER(WRITE8(zorba_state, pia0_porta_w)) // IEEE488 interface MCFG_DEVICE_ADD("pia1", PIA6821, 0) MCFG_DEVICE_ADD("pit", PIT8254, 0) MCFG_PIT8253_CLK0(XTAL_24MHz / 3) /* Timer 0: clock to J2 comm port */ MCFG_PIT8253_CLK1(XTAL_24MHz / 3) /* Timer 1: clock to U31 */ MCFG_PIT8253_CLK2(XTAL_24MHz / 3) /* Timer 2: clock to U30 */ MCFG_DEVICE_ADD("crtc", I8275, XTAL_14_31818MHz/7) MCFG_I8275_CHARACTER_WIDTH(8) MCFG_I8275_DRAW_CHARACTER_CALLBACK_OWNER(zorba_state, zorba_update_chr) MCFG_I8275_DRQ_CALLBACK(DEVWRITELINE("dma", z80dma_device, rdy_w)) MCFG_I8275_IRQ_CALLBACK(WRITELINE(zorba_state, irq0_w)) MCFG_FD1793_ADD("fdc", XTAL_24MHz / 24) MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(zorba_state, fdc_intrq_w)) MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(zorba_state, fdc_drq_w)) MCFG_FLOPPY_DRIVE_ADD("fdc:0", zorba_floppies, "525dd", floppy_image_device::default_floppy_formats) MCFG_FLOPPY_DRIVE_SOUND(true) MCFG_FLOPPY_DRIVE_ADD("fdc:1", zorba_floppies, "525dd", floppy_image_device::default_floppy_formats) MCFG_FLOPPY_DRIVE_SOUND(true) /* Keyboard */ MCFG_DEVICE_ADD("keyboard", GENERIC_KEYBOARD, 0) MCFG_GENERIC_KEYBOARD_CB(WRITE8(zorba_state, kbd_put)) MCFG_SOFTWARE_LIST_ADD("flop_list", "zorba") MACHINE_CONFIG_END ROM_START( zorba ) ROM_REGION( 0x14000, "maincpu", ROMREGION_ERASEFF ) ROM_LOAD( "780000.u47", 0x10000, 0x1000, CRC(6d58f2c5) SHA1(7763f08c801cd36e5a761c6dc9f30a50b3bc482d) ) ROM_REGION( 0x800, "kbdcpu", 0 ) ROM_LOAD( "8999-1 3-28-83", 0x080, 0x780, CRC(79fe6c0d) SHA1(4b6fca9379d5199d1347ad1187cbfdebfc4c73e7) ) ROM_REGION( 0x1000, "chargen", 0 ) ROM_LOAD( "773000.u5", 0x0000, 0x1000, CRC(d0a2f8fc) SHA1(29aee7ee657778c46e9800abd4955e6d4b33ef68) ) ROM_REGION( 0x60, "proms", 0 ) ROM_LOAD( "74ls288.u37", 0x0000, 0x0020, CRC(0a67edd6) SHA1(c1ece8978a3a061e0130d43907fa63a71e75e75d) ) ROM_LOAD( "74ls288.u38", 0x0020, 0x0020, CRC(5ec93ea7) SHA1(3a84c098474b05d5cbe1939a3e15f66d06470581) ) ROM_LOAD( "74ls288.u77", 0x0040, 0x0020, CRC(946e03b0) SHA1(24240bdd7bdf507a5b51628fb36ad1266fc53a28) ) // suspected bad dump ROM_END COMP( 1984?, zorba, 0, 0, zorba, zorba, zorba_state, zorba, "Modular Micros", "Zorba (Modular Micros)", MACHINE_NOT_WORKING ) // Undumped versions (see startup screen notes at top of file) // COMP( 1983, zorbat, zorba, 0, zorba, zorba, zorba_state, zorba, "Telcon Industries", "Zorba (Telcon Industries)", MACHINE_NOT_WORKING ) // COMP( 1984, zorbag, zorba, 0, zorba, zorba, zorba_state, zorba, "Gemini Electronics", "Zorba (Gemini Electronics)", MACHINE_NOT_WORKING )