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(MESS) checkpoint (nw)
This commit is contained in:
Wilbert Pol
parent
1e895ae4fb
commit
3923db613d
@ -7,11 +7,24 @@
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2014/01/07 Skeleton driver.
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The Bandai Supoer Vision 8000 contains:
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- NEC D78C (Z80)
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- AY-3-8910
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- AMI S68047P (6847 variant)
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- NEC D8255C
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Looking at the code of the cartridges it seems there is:
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- 1KB of main system RAM
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- 3KB of video RAM
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TODO:
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- Implement S68074P video chip
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- Figure out configuration of S68047P pins through 8910 port A
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- Figure out input ports, left and right might be swapped
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- Verify clock
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- Figure out IRQ source
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KNOWN ISSUES:
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- pacpac and submar wait for an irq, where is that coming from? vblank?
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****************************************************************************/
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@ -21,6 +34,7 @@
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#include "imagedev/cartslot.h"
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#include "machine/i8255.h"
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#include "sound/ay8910.h"
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#include "video/mc6847.h"
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class sv8000_state : public driver_device
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@ -29,12 +43,15 @@ public:
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sv8000_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_s68047p(*this, "s68047p")
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, m_videoram(*this, "videoram")
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, m_io_row0_left(*this, "ROW0_LEFT")
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, m_io_row1_left(*this, "ROW1_LEFT")
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, m_io_row2_left(*this, "ROW2_LEFT")
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{ }
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DECLARE_DEVICE_IMAGE_LOAD_MEMBER( cart );
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DECLARE_READ8_MEMBER( ay_port_a_r );
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DECLARE_READ8_MEMBER( ay_port_b_r );
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DECLARE_WRITE8_MEMBER( ay_port_a_w );
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@ -47,16 +64,30 @@ public:
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DECLARE_READ8_MEMBER( i8255_portc_r );
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DECLARE_WRITE8_MEMBER( i8255_portc_w );
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DECLARE_READ8_MEMBER( mc6847_videoram_r );
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private:
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virtual void machine_start();
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virtual void machine_reset();
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required_device<cpu_device> m_maincpu;
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required_device<mc6847_base_device> m_s68047p;
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required_shared_ptr<const UINT8> m_videoram;
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required_ioport m_io_row0_left;
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required_ioport m_io_row1_left;
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required_ioport m_io_row2_left;
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UINT8 m_column;
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// graphics signals
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UINT8 m_ag;
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UINT8 m_gm2;
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UINT8 m_gm1;
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UINT8 m_gm0;
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UINT8 m_as;
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UINT8 m_css;
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UINT8 m_intext;
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UINT8 m_inv;
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};
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@ -64,7 +95,7 @@ static ADDRESS_MAP_START(sv8000_mem, AS_PROGRAM, 8, sv8000_state)
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ADDRESS_MAP_UNMAP_HIGH
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AM_RANGE( 0x0000, 0x0fff ) AM_ROM
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AM_RANGE( 0x8000, 0x83ff ) AM_RAM // Work RAM??
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AM_RANGE( 0xc000, 0xcbff ) AM_RAM // Display RAM??
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AM_RANGE( 0xc000, 0xcbff ) AM_RAM AM_SHARE("videoram")
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ADDRESS_MAP_END
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@ -117,6 +148,15 @@ INPUT_PORTS_END
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void sv8000_state::machine_start()
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{
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m_ag = 0;
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m_gm2 = 0;
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m_gm1 = 0;
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m_gm0 = 0;
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m_as = 0;
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m_css = 0;
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m_intext = 0;
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m_inv = 0;
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save_item(NAME(m_column));
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}
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@ -241,14 +281,53 @@ READ8_MEMBER( sv8000_state::ay_port_b_r )
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// Possibly connected to S68047P for selecting text/graphics modes
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// misvader:
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// 0x42 01000010 set on normal text screen
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// 0x5A 01011010 set for a 256x192 bit mapped screen 3KB in 6KB mode?
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//
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// spfire:
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// 0x42 01000010 text
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// 0x5A 01011010 graphics 3KB in 6KB mode?
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//
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// othello:
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// 0x02 00000010 normal text screen
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//
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// gunprof:
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// 0x00 00000000 text
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// 0x38 00111000 graphics 3KB mode 1-101
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//
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// pacpac:
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// 0x00 00000000 text
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// 0x5A 01011010 graphics 3KB in 6KB mode? 1-111
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//
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// submar:
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// 0x00 00000000 text
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// 0x5A 01011010 graphics 3KB in 6KB mode?
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//
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// beamgala:
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// 0x5A 01011010 graphics 3KB in 6KB mode?
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//
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WRITE8_MEMBER( sv8000_state::ay_port_a_w )
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{
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printf("ay_porta_w: %02X\n", data);
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logerror("ay_port_a_w: %02X\n", data);
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// Lacking schematics, these are all wild guesses
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m_ag = ( data & 0x18 );
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m_gm2 = ( data & 0x10 );
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m_gm1 = ( data & 0x40 );
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m_gm0 = ( data & 0x08 );
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m_s68047p->ag_w( m_ag ? ASSERT_LINE : CLEAR_LINE );
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m_s68047p->gm2_w( m_gm2 ? ASSERT_LINE : CLEAR_LINE );
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m_s68047p->gm1_w( m_gm1 ? ASSERT_LINE : CLEAR_LINE );
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m_s68047p->gm0_w( m_gm0 ? ASSERT_LINE : CLEAR_LINE );
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}
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WRITE8_MEMBER( sv8000_state::ay_port_b_w )
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{
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printf("ay_portb_w: %02X\n", data);
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logerror("ay_port_b_w: %02X\n", data);
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}
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@ -264,6 +343,52 @@ static const ay8910_interface sv8000_ay8910_interface =
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};
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READ8_MEMBER( sv8000_state::mc6847_videoram_r )
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{
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if (offset == ~0) return 0xff;
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if ( m_ag ) {
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if ( m_gm1 ) {
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// 256 x 192 / 6KB
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offset = ( ( offset & 0x1fc0 ) >> 1 ) | ( offset & 0x1f );
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return m_videoram[offset % 0xc00];
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}
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else
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{
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// 256 x 96 / 3KB
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return m_videoram[offset % 0xc00];
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}
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}
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// Standard text
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UINT8 data = m_videoram[offset % 0xc00];
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m_s68047p->inv_w( ( data & 0x80 ) ? ASSERT_LINE : CLEAR_LINE );
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return data;
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}
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static const mc6847_interface sv8000_mc6847_interface =
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{
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"screen",
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DEVCB_DRIVER_MEMBER(sv8000_state,mc6847_videoram_r), // data fetch
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL, /* AG */
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DEVCB_NULL, /* GM2 */
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DEVCB_NULL, /* GM1 */
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DEVCB_NULL, /* GM0 */
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DEVCB_NULL, /* CSS */
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DEVCB_NULL, /* AS */
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DEVCB_NULL, /* INTEXT */
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DEVCB_NULL, /* INV */
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NULL,
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false
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};
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static MACHINE_CONFIG_START( sv8000, sv8000_state )
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/* basic machine hardware */
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MCFG_CPU_ADD("maincpu",Z80, XTAL_10_738635MHz/3) /* Not verified */
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@ -274,6 +399,8 @@ static MACHINE_CONFIG_START( sv8000, sv8000_state )
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/* video hardware */
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// S68047P - Unknown whether the internal or an external character rom is used
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MCFG_MC6847_ADD("s68047p", MC6847_NTSC, XTAL_10_738635MHz/3, sv8000_mc6847_interface ) // Clock not verified
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MCFG_SCREEN_MC6847_NTSC_ADD("screen", "s68047p")
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/* sound hardware */
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MCFG_SPEAKER_STANDARD_MONO("mono")
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