// license:BSD-3-Clause // copyright-holders:Robbbert /*************************************************************************** Not much is known about this Hungarian Z80-based machine, not even the name of the manufacturer. It comes with 64K of RAM, and 2x 5.25 floppy drives. Video is a CGA card. Notes found at vcfed: 1988, hungarian unknown, junior80 2x 5.25 FDD DSDD 80T, 64K ram, CGA graphics card, Serial card with 2 ports which is in addition to those ports on the main board. So this are the main chips on the logic board: Address / Chip 00H-03H I8255 00H - input port for keyboard scan codes 01H - input port for system jumpers and parallel interface extra lines PB6-7 - extra line parallel port B PB4-5 - extra line parallel port A PB3 - 0 - parallel keyboard / 1-serial keyboard PB2 - 0 - internal console / 1 - serial console PB1 - disk drive 2,3 - 0=5.25", 1=8" PB0 - disk drive 0,1 - 0=5.25", 1=8" 02H PC7 - second channel I8253 - 0 deactivated, 1 activated PC6 - speaker modulation PC4-5 - extra lines parallel port B PC2-3 - extra lines parallel port A PC1 - activate / deactivate serial keyboard PC0 - comutation 0-RAM / 1 -ROM 03H command port for I8255 10H-13H Z80A SIO 10H - dataport A 11H - dataport B 12H - command port A 13H - command port B THE code in ROM programms z80SIO: port A unprogrammed, port B: 8 bits, 2 stop-bits, no parity, clockx16 - when the OS is loaded from disk, both channels are programmed identical. 20-23H Z80A CTC 20H - data port - interrupt vector for channel 0 (in 8mhz, out 250khz) 21H - command port data channel 1 22H - command port data channel 2 23H - command port data channel 3 both ROM and OS(from disk) programm the z80A ctc like this: channel 0: counter with no interrupt channel 1: counter with interrupt on falling edge of the page signal of the display unit channel 2: counter with interrupt on falling edge of the keyboard interrupt channel 3: counter with interrupt on rising edge ot the fdd controller interrupt 30H-38H i8257 DMA 30H - DMA channel 0 - memory address for DMA transfer start 31H - DMA channel 0 - number of bytes to transfer 32H - DMA channel 1 - memory address for DMA transfer start 33H - DMA channel 1 - number of bytes to transfer 34H - DMA channel 2 - memory address for DMA transfer start 35H - DMA channel 2 - number of bytes to transfer 36H - DMA channel 3 - memory address for DMA transfer start 37H - DMA channel 4 - number of bytes to transfer 38H - state command of DMA chip the only programmed channel is channel 1, used for data transfer between ram and fdd controller 40H-41H - I8272 floppy drive controller 40H - command and state of I8272 41H - dataport 48H - commands for fdd controller D6,D7 - x D5 - reset I8272 (0 active) D4 - type of disk drive (0 - 8", 1- 5.25") D0-3 - start stop drive motor (drive 0-3) 49H - load the scan address into the hardware in graphics mode 4AH - command port of display controller (discrete logic!) D6,7 - x D5 - blinking activated (1 active) D4 - mode selection 0 = 320x200 1=640x200 D3 - display 0=off 1 = on D2 - validate acces display ram (16k display ram on board) - 1 active D1 - 0 - graphics mode / 1 - text mode D0 - 0 = 40x25, 1= 80x25 4BH - color selection and text page selection for display controller D6-7 - selection of working text page D5 - select color palette D4 - backgroung D3 - bright D2 - red D1 - green D0 - blue 4CH - address port - row - select the first row displayed in text mode 4DH - selection port of clock for transmit and receive for Z80 SIO D1-7 - x D0 - 0= internal clock, 1= external clock 4FH - reset port for serial keyboard - keyboard interrupt is deactivated by writing or reading of 4FH 50H-53H - z80A PIO 50H - data port A 51H - data port B 52H - interrupt vector A 53H - interrupt vector B programmed in rom and from os like this: port A input with interrupt, port B - output with interrupt 60H-6FH ramdisk 70H-73H - i8253 70H - dataport channel 0 71H - dataport channel 1 72H - dataport channel 2 73H - command port I8253 - i8253 programmed in rom and from os like: channel 0 unprogrammed, channel 1: clock divider for 9600 bps clock channel 2: clock divider for sound generator when the os loads, channel 0 is programmed like channel 1 *************************************************************************** To Do: Almost everything. Status: Just a closet skeleton ***************************************************************************/ #include "emu.h" #include "cpu/z80/z80.h" #include "imagedev/floppy.h" #include "machine/pit8253.h" #include "machine/i8255.h" #include "machine/i8257.h" #include "machine/upd765.h" #include "machine/z80ctc.h" #include "machine/z80sio.h" #include "machine/z80pio.h" //#include "bus/rs232/rs232.h" class junior80_state : public driver_device { public: junior80_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") , m_ctc(*this, "ctc") , m_dma(*this, "dma") , m_pio(*this, "pio") , m_pit(*this, "pit") , m_ppi(*this, "ppi") , m_uart(*this, "uart") , m_fdc(*this, "fdc") , m_floppy0(*this, "fdc:0") , m_floppy1(*this, "fdc:1") //, m_io_keyboard(*this, "LINE%u", 0U) { } void junior80(machine_config &config); protected: virtual void machine_start() override; virtual void machine_reset() override; private: void mem_map(address_map &map); void io_map(address_map &map); void drive_w(offs_t offset, u8 data); floppy_image_device *m_floppy = 0; required_device m_maincpu; required_device m_ctc; required_device m_dma; required_device m_pio; required_device m_pit; required_device m_ppi; required_device m_uart; required_device m_fdc; required_device m_floppy0; required_device m_floppy1; //required_ioport_array<8> m_io_keyboard; }; void junior80_state::mem_map(address_map &map) { map(0x0000, 0xffff).ram(); map(0x0000, 0x07ff).rom(); } void junior80_state::io_map(address_map &map) { map.global_mask(0xff); map.unmap_value_high(); map(0x00, 0x03).mirror(0x0c).rw(m_ppi, FUNC(i8255_device::read), FUNC(i8255_device::write)); map(0x10, 0x13).mirror(0x0c).rw(m_uart, FUNC(z80sio_device::ba_cd_r), FUNC(z80sio_device::ba_cd_w)); map(0x20, 0x23).mirror(0x0c).rw(m_ctc, FUNC(z80ctc_device::read), FUNC(z80ctc_device::write)); map(0x30, 0x38).rw(m_dma, FUNC(i8257_device::read), FUNC(i8257_device::write)); map(0x40, 0x41).mirror(0x06).m(m_fdc, FUNC(i8272a_device::map)); map(0x48, 0x48).w(FUNC(junior80_state::drive_w)); //map(0x49, 0x4d) video/graphics control //map(0x4f, 0x4f) kbd ack map(0x50, 0x53).mirror(0x0c).rw(m_pio, FUNC(z80pio_device::read), FUNC(z80pio_device::write)); //map(0x60, 0x6f) ramdisk map(0x70, 0x73).mirror(0x0c).rw("pit", FUNC(pit8253_device::read), FUNC(pit8253_device::write)); } static INPUT_PORTS_START( junior80 ) INPUT_PORTS_END /************************************* * * Port handlers. * *************************************/ void junior80_state::drive_w(offs_t offset, u8 data) { m_floppy = nullptr; if (BIT(data, 0)) m_floppy = m_floppy0->get_device(); if (BIT(data, 1)) m_floppy = m_floppy1->get_device(); //if (BIT(data, 2)) m_floppy = m_floppy2->get_device(); //if (BIT(data, 3)) m_floppy = m_floppy3->get_device(); m_fdc->set_floppy(m_floppy); if (m_floppy) { m_floppy->mon_w(0); //m_floppy->ss_w(BIT(data, 4)); } //m_fdc->dden_w(!BIT(data, 6)); m_fdc->set_unscaled_clock(BIT(data, 4) ? 4000000 : 8000000); if (!BIT(data, 5)) m_fdc->reset(); } /************************************* * Machine * *************************************/ void junior80_state::machine_start() { } void junior80_state::machine_reset() { m_floppy = nullptr; } static void junior80_floppies(device_slot_interface &device) { device.option_add("fdd", FLOPPY_525_QD); } void junior80_state::junior80(machine_config &config) { /* basic machine hardware */ Z80(config, m_maincpu, 2'500'000); // 2.5 or 4MHz selectable by jumpers m_maincpu->set_addrmap(AS_PROGRAM, &junior80_state::mem_map); m_maincpu->set_addrmap(AS_IO, &junior80_state::io_map); // devices I8272A(config, m_fdc, 8_MHz_XTAL / 2); FLOPPY_CONNECTOR(config, "fdc:0", junior80_floppies, "fdd", floppy_image_device::default_mfm_floppy_formats).enable_sound(true); FLOPPY_CONNECTOR(config, "fdc:1", junior80_floppies, "fdd", floppy_image_device::default_mfm_floppy_formats).enable_sound(true); Z80PIO(config, m_pio, 0); Z80SIO(config, m_uart, 0); Z80CTC(config, m_ctc, 0); PIT8253(config, m_pit, 0); I8255(config, m_ppi, 0); I8257(config, m_dma, 0); //m_dma->out_hrq_cb().set(FUNC(junior80_state::hrq_w)); //m_dma->in_memr_cb().set(FUNC(junior80_state::memory_r)); //m_dma->out_memw_cb().set(FUNC(junior80_state::memory_w)); //m_dma->in_ior_cb<1>().set(m_fdc, FUNC(upd765_device::data_r)); //m_dma->out_iow_cb<1>().set(m_fdc, FUNC(upd765_device::data_w)); } /*************************************************************************** Game driver(s) ***************************************************************************/ ROM_START(junior80) ROM_REGION(0x0800, "maincpu",0) ROM_LOAD( "junior80_seria_321-ok.ic46", 0x0000, 0x0800, CRC(07f09842) SHA1(c7591a1006ae59d6353859ca401c57ff6eb1d4ff) ) ROM_END // YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS COMP( 1988, junior80, 0, 0, junior80, junior80, junior80_state, empty_init, "", "Junior 80", MACHINE_IS_SKELETON )