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(MESS) pt68k4: Hooked up devices, can now read floppy disks. [R. Belmont]
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R. Belmont
parent
2872800e9e
commit
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@ -6,39 +6,65 @@
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2011-01-03 Skeleton driver.
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2013-09-30 Connected to a terminal
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2014-01-03 Connect real DUARTs, FDC, and TimeKeeper. Settings now save properly, floppies can be read.
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This has the appearance of a PC, including pc power supply, slots, etc
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on a conventional pc-like motherboard and case.
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Some pics: http://www.wormfood.net/old_computers/
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Note: bios 0 works with the terminal. When first started, press Enter
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to get the logo. Enter HE to get a list of commands. Terminate
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numeric entries with a Space (not Enter!).
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Note: bios 0 works with the terminal. When first started, set terminal
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to 19200 baud and press Enter to get the logo. Enter HE to get a
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list of commands. Terminate numeric entries with a Space (not Enter!).
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bios 1 works now too, but it's weird. Set the terminal to 2400 baud
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then press F3 reset and hit a key or 2. When garbage starts spewing,
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bump the terminal to 9600 baud and press "O Enter". The menu should appear.
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Chips:
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68230 Parallel Interface/Timer @ FE0080
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68681 DUART/Timer (x2) @ FE0000 and FE0040
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WD37C65 FDC @ FE0101/3/etc (compatible with PC NEC765)
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Floppy drive select @ FE00C1: bits 0/1 drive select 0-3, bit 5 = 1 for double density, bit 6 = side select
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MK48T02 TimeKeeper @ FF0FF1/3/5/etc.
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68230 Parallel Interface/Timer @ FE0081
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68681 DUART/Timer (x2) @ FE0001 and FE0041
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WD37C65 FDC (PC FDC compatible, even mapped as an ISA device)
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MK48T02 TimeKeeper @ odd bytes from FF0001 to FF0FFF. even bytes in that range are a standard SRAM chip which is not backed up.
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Keyboard at FE01C1 (status/IRQ clear)/FE01C3 (AT scan codes)
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WD1002 HDD controller @ FE0141-FE014F. "Monk" BIOS also supports an 8-bit ISA IDE card.
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Video: ISA MDA or CGA-style boards
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MDA maps VRAM at D60000, 6845 address at FA0769, 6845 data at FA076B, control latch at FA0771
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CGA maps VRAM at D70000, 6845 address at FA07A9, 6845 data at FA07AB, control port at FA07B1, color set at FA07B3, CGA status at FA07B5
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Video: ISA MDA or CGA/EGA/VGA-style boards
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MDA maps VRAM at D60001, 6845 address at FA0769, 6845 data at FA076B, control latch at FA0771
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CGA maps VRAM at D70001, 6845 address at FA07A9, 6845 data at FA07AB, control port at FA07B1, color set at FA07B3, CGA status at FA07B5
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ISA memory is C00001-DFFFFF odd bytes only. So the MDA B0000 framebuffer becames (B0000*2) + C00001 = D60001.
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ISA I/O is at FA0001-FBFFFF odd bytes only, and the mapping is similar.
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HUMBUG BIOS tests MDA and CGA VRAM to determine existence, falls back to serial console if neither exists. If both exist, MDA is used.
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VRAM is every other byte for ISA cards. (Only 8 bit cards are supported).
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OP3 on DUART1 drives a speaker. n68681 needs to handle "OP3 is timer/counter output" mode.
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IRQs:
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5: keyboard has new scan code available, all others don't exist
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2: 68230 PIT
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4: DUART2
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5: keyboard has a new scan code and DUART1
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6: PC FDC IRQ
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TODO: 68230 device. Better hardware documentation would be nice too.
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ISA interface and keyboard port would greatly improve usability.
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How to handle ISA transparently so cards map themselves automatically?
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****************************************************************************/
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#include "emu.h"
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#include "cpu/m68000/m68000.h"
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#include "machine/terminal.h"
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#include "machine/n68681.h"
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#include "machine/timekpr.h"
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#include "machine/pc_fdc.h"
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#include "formats/imd_dsk.h"
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#define DUART1_TAG "duart1"
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#define DUART2_TAG "duart2"
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#define TIMEKEEPER_TAG "timekpr"
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#define PCFDC_TAG "pcfdc"
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class pt68k4_state : public driver_device
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{
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@ -46,38 +72,70 @@ public:
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pt68k4_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_p_base(*this, "rambase")
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, m_p_upper(*this, "upper_ram")
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, m_maincpu(*this, "maincpu")
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, m_terminal(*this, TERMINAL_TAG)
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, m_duart1(*this, DUART1_TAG)
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, m_duart2(*this, DUART2_TAG)
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{ }
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DECLARE_WRITE8_MEMBER(kbd_put);
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DECLARE_READ16_MEMBER(status_r);
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DECLARE_READ16_MEMBER(nop_r);
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//virtual void video_start();
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//UINT32 screen_update_pt68k4(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
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DECLARE_READ8_MEMBER(hiram_r);
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DECLARE_WRITE8_MEMBER(hiram_w);
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DECLARE_READ8_MEMBER(keyboard_r);
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DECLARE_WRITE8_MEMBER(keyboard_w);
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DECLARE_WRITE_LINE_MEMBER(duart1_irq);
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DECLARE_WRITE_LINE_MEMBER(duart2_irq);
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DECLARE_FLOPPY_FORMATS( floppy_formats );
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private:
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virtual void machine_reset();
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required_shared_ptr<UINT16> m_p_base;
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required_shared_ptr<UINT16> m_p_upper;
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required_device<cpu_device> m_maincpu;
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required_device<generic_terminal_device> m_terminal;
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required_device<duartn68681_device> m_duart1;
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required_device<duartn68681_device> m_duart2;
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UINT8 m_hiram[0x800];
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};
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FLOPPY_FORMATS_MEMBER( pt68k4_state::floppy_formats )
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FLOPPY_IMD_FORMAT
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FLOPPY_FORMATS_END
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static ADDRESS_MAP_START(pt68k4_mem, AS_PROGRAM, 16, pt68k4_state)
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ADDRESS_MAP_UNMAP_HIGH
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AM_RANGE(0x000000, 0x07ffff) AM_RAM AM_SHARE("rambase") // 512 KB RAM / ROM at boot
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AM_RANGE(0x000000, 0x0fffff) AM_RAM AM_SHARE("rambase") // 1MB RAM (OS9 needs more)
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AM_RANGE(0xf80000, 0xf8ffff) AM_ROM AM_REGION("roms", 0)
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AM_RANGE(0xfe0002, 0xfe0003) AM_READ(status_r)
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AM_RANGE(0xfe0006, 0xfe0007) AM_DEVWRITE8(TERMINAL_TAG, generic_terminal_device, write, 0x00ff)
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AM_RANGE(0xfe0012, 0xfe0013) AM_READ(nop_r)
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AM_RANGE(0xff0000, 0xffffff) AM_RAM AM_SHARE("upper_ram")
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AM_RANGE(0xfa07e0, 0xfa07ef) AM_DEVICE8(PCFDC_TAG, pc_fdc_at_device, map, 0x00ff)
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AM_RANGE(0xfe0000, 0xfe001f) AM_DEVREADWRITE8(DUART1_TAG, duartn68681_device, read, write, 0x00ff)
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AM_RANGE(0xfe0040, 0xfe005f) AM_DEVREADWRITE8(DUART2_TAG, duartn68681_device, read, write, 0x00ff)
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AM_RANGE(0xfe01c0, 0xfe01c3) AM_READWRITE8(keyboard_r, keyboard_w, 0x00ff)
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AM_RANGE(0xff0000, 0xff0fff) AM_READWRITE8(hiram_r, hiram_w, 0xff00)
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AM_RANGE(0xff0000, 0xff0fff) AM_DEVREADWRITE8(TIMEKEEPER_TAG, timekeeper_device, read, write, 0x00ff)
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ADDRESS_MAP_END
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/* Input ports */
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static INPUT_PORTS_START( pt68k4 )
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INPUT_PORTS_END
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/* built in keyboard: offset 0 reads 0x80 if key ready, 0 if not. If key ready, offset 1 reads scancode. Write (and read?) to offs 0 clears key ready? */
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READ8_MEMBER(pt68k4_state::keyboard_r)
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{
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return 0;
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}
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WRITE8_MEMBER(pt68k4_state::keyboard_w)
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{
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}
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READ8_MEMBER(pt68k4_state::hiram_r)
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{
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return m_hiram[offset];
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}
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WRITE8_MEMBER(pt68k4_state::hiram_w)
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{
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m_hiram[offset] = data;
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}
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void pt68k4_state::machine_reset()
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{
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@ -87,50 +145,42 @@ void pt68k4_state::machine_reset()
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m_maincpu->reset();
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}
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//void pt68k4_state::video_start()
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//{
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//}
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//UINT32 pt68k4_state::screen_update_pt68k4(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
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//{
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// return 0;
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//}
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READ16_MEMBER( pt68k4_state::status_r )
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WRITE_LINE_MEMBER(pt68k4_state::duart1_irq)
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{
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return 0x8c;
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m_maincpu->set_input_line(M68K_IRQ_5, state);
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}
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READ16_MEMBER( pt68k4_state::nop_r )
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WRITE_LINE_MEMBER(pt68k4_state::duart2_irq)
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{
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return 0;
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m_maincpu->set_input_line(M68K_IRQ_4, state);
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}
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WRITE8_MEMBER( pt68k4_state::kbd_put )
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{
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m_p_upper[0x64f] = 0x100 | data;
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}
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static GENERIC_TERMINAL_INTERFACE( terminal_intf )
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{
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DEVCB_DRIVER_MEMBER(pt68k4_state, kbd_put)
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};
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static SLOT_INTERFACE_START( pt68k_floppies )
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SLOT_INTERFACE( "525dd", FLOPPY_525_DD )
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SLOT_INTERFACE( "525hd", FLOPPY_525_HD )
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SLOT_INTERFACE( "35dd", FLOPPY_35_DD )
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SLOT_INTERFACE( "35hd", FLOPPY_35_HD )
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SLOT_INTERFACE_END
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static MACHINE_CONFIG_START( pt68k4, pt68k4_state )
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/* basic machine hardware */
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MCFG_CPU_ADD("maincpu",M68000, XTAL_16MHz)
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MCFG_CPU_PROGRAM_MAP(pt68k4_mem)
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/* video hardware */
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MCFG_GENERIC_TERMINAL_ADD(TERMINAL_TAG, terminal_intf)
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//MCFG_SCREEN_ADD("screen", RASTER)
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//MCFG_SCREEN_REFRESH_RATE(50)
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//MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
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//MCFG_SCREEN_SIZE(640, 480)
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//MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1)
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//MCFG_SCREEN_UPDATE_DRIVER(pt68k4_state, screen_update_pt68k4)
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//MCFG_PALETTE_LENGTH(2)
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//MCFG_PALETTE_INIT_OVERRIDE(driver_device, black_and_white)
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// add the DUARTS. first one has the console on channel A at 19200.
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MCFG_DUARTN68681_ADD("duart1", XTAL_16MHz / 4)
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MCFG_DUARTN68681_IRQ_CALLBACK(WRITELINE(pt68k4_state, duart1_irq))
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MCFG_DUARTN68681_A_TX_CALLBACK(DEVWRITELINE("rs232", serial_port_device, tx))
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MCFG_DUARTN68681_ADD("duart2", XTAL_16MHz / 4)
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MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "serial_terminal")
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MCFG_SERIAL_OUT_RX_HANDLER(DEVWRITELINE("duart1", duartn68681_device, rx_a_w))
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MCFG_M48T02_ADD(TIMEKEEPER_TAG)
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MCFG_PC_FDC_AT_ADD(PCFDC_TAG)
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MCFG_FLOPPY_DRIVE_ADD(PCFDC_TAG ":0", pt68k_floppies, "525dd", pt68k4_state::floppy_formats)
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MACHINE_CONFIG_END
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/* ROM definition */
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@ -153,4 +203,4 @@ ROM_END
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/* Driver */
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/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
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COMP( 1990, pt68k4, 0, 0, pt68k4, pt68k4, driver_device, 0, "Peripheral Technology", "PT68K4", GAME_NOT_WORKING | GAME_NO_SOUND)
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COMP( 1990, pt68k4, 0, 0, pt68k4, pt68k4, driver_device, 0, "Peripheral Technology", "PT68K4", GAME_NOT_WORKING | GAME_NO_SOUND)
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