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https://github.com/holub/mame
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getaway: move register notes into io_w function
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hap
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@ -12,21 +12,24 @@ Hardware notes:
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- discrete sound
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TODO:
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- sketchy steering wheel emulation, doesn't work properly with regular analog
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field, somehow working with digital:
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- sketchy steering wheel emulation, doesn't work properly with regular analog
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field, somehow working with digital;
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- is the gas throttle min/max correct or should "LOW" be more than 0?
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- several unknowns in the video emulation:
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- score layer is a simplification hack, it is unknown how it should really
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- score layer is a simplification hack, it is unknown how it should really
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cope RMW-wise against main layer. It also has wrong colors (different color
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base or overlay artwork, with extra bit output for taking priority?);
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- screen sides presumably needs an overlay artwork (red trees?);
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- screen sides presumably needs an overlay artwork (red trees?) or more
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more likely an inverted green bit (which would also turn the trees yellow);
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- do we need to offset X by 1 char-wise? Fills starts from 0x1f;
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- video timing is unknown, pixel clock XTAL is 10.816MHz;
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- blitter busy flag;
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- miscellanea, cfr. in documentation;
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- sound emulation;
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- lamps and 7segs;
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- lamps;
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- 7seg panel for highscores? (you can see it on deluxe cab, but I don't see any
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I/O writes that look like 7seg data);
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- undumped proms?
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******************************************************************************/
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@ -74,8 +77,8 @@ private:
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DECLARE_WRITE_LINE_MEMBER(vblank_irq);
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void io_w(offs_t offset, u8 data);
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template <int i> u8 dsw_r(offs_t offset);
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template <int i> u8 input_r(offs_t offset);
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template <unsigned N> u8 dsw_r(offs_t offset);
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template <unsigned N> u8 input_r(offs_t offset);
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u8 busy_r();
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u8 m_regs[0x10];
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@ -116,7 +119,7 @@ uint32_t getaway_state::screen_update(screen_device &screen, bitmap_ind16 &bitma
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for (int i = 0; i < 8; i++)
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bitmap.pix(y, x + i) = BIT(r, i) << 2 | BIT(g, i) << 1 | BIT(b, i);
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if (x < x_overlay)
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continue;
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@ -148,52 +151,69 @@ WRITE_LINE_MEMBER(getaway_state::vblank_irq)
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m_maincpu->pulse_input_line(INT_9900_INTREQ, 2 * m_maincpu->minimum_quantum_time());
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}
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// [0x00]
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// x--- ---- coin counter or coin SFX (more likely former?)
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// -??? ???? outputs? sounds?
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// [0x01]
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// x--- ---- blitter trigger (0->1)
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// -x-- ---- fill mode (1) / RMW (0)
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// --?- ---- 1 on press start screen (lamp or blitter related)
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// ---- x--- destination VRAM select, (1) normal VRAM (0) score VRAM
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// ---- --?? unknown, (11) mostly, flips with (10) when starting from the right lane.
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// [0x02]
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// ???? ????
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// [0x03]
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// yyyy yyyy y destination offset
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// [0x04]
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// xxxx xxxx x destination offset
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// [0x05]
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// ssss ssss source GFX ROM lower address
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// [0x06]
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// ccc- ---- color mask
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// ---S SSSS source GFX ROM upper address
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// [0x07]
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// ???w wwww transfer width, in 8 pixel units
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// Notice that 0xff is set on POST, either full clear or NOP
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// [0x08]
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// hhhh hhhh transfer height, in scanline units
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// [0x09]
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// ---- ---? 1 triggered when explosion occurs
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// [0x0a]
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// x--- ---- sound engine enable? (0)
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// ---x ---- sound filter?
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// ---- xxxx sound engine SFX strength?
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// [0x0b]
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// ???? ???? (game writes 0x30)
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// [0x0c]
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// ---- ---? (game writes 1)
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void getaway_state::io_w(offs_t offset, u8 data)
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{
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// writes 1 bit at a time
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u8 n = offset >> 3;
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u8 bit = offset & 7;
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u8 mask = 1 << bit;
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data = (m_regs[n] & ~mask) | ((data & 1) ? mask : 0);
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u8 prev = m_regs[n];
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u8 iomask = 1 << (offset & 7);
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m_regs[n] = (m_regs[n] & ~iomask) | ((data & 1) ? iomask : 0);
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/*
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[0x00]
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x--- ---- coin counter or coin SFX (more likely former?)
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---- x--- coin lockout?
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-??? -??? outputs? sounds?
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[0x01]
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x--- ---- blitter trigger (0->1)
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-x-- ---- fill mode (1) / RMW (0)
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--?- ---- 1 on press start screen (lamp or blitter related)
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---- x--- destination VRAM select, (1) normal VRAM (0) score VRAM
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---- --?? unknown, (11) mostly, flips with (10) when starting from the right lane.
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[0x02]
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???? ????
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[0x03]
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yyyy yyyy y destination offset
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[0x04]
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xxxx xxxx x destination offset
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[0x05]
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ssss ssss source GFX ROM lower address
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[0x06]
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ccc- ---- color mask
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---S SSSS source GFX ROM upper address
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[0x07]
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???w wwww transfer width, in 8 pixel units
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Notice that 0xff is set on POST, either full clear or NOP
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[0x08]
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hhhh hhhh transfer height, in scanline units
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[0x09]
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---- ---? 1 triggered when explosion occurs
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[0x0a]
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x--- ---- sound engine enable? (0)
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---x ---- sound filter?
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---- xxxx sound engine SFX strength?
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[0x0b]
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???? ???? (game writes 0x30)
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[0x0c]
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---- ---? (game writes 1)
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*/
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//popmessage("%02x %02x %02x|%02x %02x %02x %02x", m_regs[0], m_regs[1] & 0x37, m_regs[2], m_regs[9], m_regs[0xa], m_regs[0xb], m_regs[0x0c]);
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// start gfx rom->vram transfer
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if (n == 1 && ~m_regs[n] & data & 0x80)
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if (n == 1 && ~prev & m_regs[1] & 0x80)
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{
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u16 src = m_regs[6] << 8 | m_regs[5];
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// several valid entries are drawn with color=0 cfr. tyres
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@ -212,7 +232,7 @@ void getaway_state::io_w(offs_t offset, u8 data)
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const bool fill_mode = (m_regs[1] & 0x40) == 0x40;
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const bool layer_bank = BIT(m_regs[1], 3);
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u8 *vram = (layer_bank) ? m_vram : m_score_vram;
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for (int count = 0; count < width; count ++)
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{
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for (int yi = 0; yi < height; yi++)
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@ -223,7 +243,7 @@ void getaway_state::io_w(offs_t offset, u8 data)
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u16 dest = ((x_offs >> 3) & 0x1f) << 8;
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dest += (yi + y) & 0xff;
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u8 pen_mask = 1 << (x_offs & 7);
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if (fill_mode)
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{
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for (int i = 0; i < 3; i++)
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@ -249,7 +269,7 @@ void getaway_state::io_w(offs_t offset, u8 data)
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vram[out_bank] &= ~pen_mask;
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}
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}
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src = (src + 1) & 0xffff;
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}
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}
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@ -258,13 +278,11 @@ void getaway_state::io_w(offs_t offset, u8 data)
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x &= 0xff;
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}
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}
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m_regs[n] = data;
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}
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template <int i> u8 getaway_state::input_r(offs_t offset)
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template <unsigned N> u8 getaway_state::input_r(offs_t offset)
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{
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return BIT(m_inputs[i]->read(), offset);
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return BIT(m_inputs[N]->read(), offset);
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}
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u8 getaway_state::busy_r()
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@ -273,9 +291,9 @@ u8 getaway_state::busy_r()
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return 0;
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}
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template <int i> u8 getaway_state::dsw_r(offs_t offset)
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template <unsigned N> u8 getaway_state::dsw_r(offs_t offset)
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{
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return BIT(m_dsw[i]->read(), offset);
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return BIT(m_dsw[N]->read(), offset);
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}
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@ -292,7 +310,6 @@ void getaway_state::main_map(address_map &map)
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void getaway_state::io_map(address_map &map)
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{
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map.global_mask(0xff);
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map.unmap_value_high();
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map(0x00, 0xff).w(FUNC(getaway_state::io_w));
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map(0x00, 0x09).r(FUNC(getaway_state::input_r<1>)); // shifter
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map(0x0a, 0x19).r(FUNC(getaway_state::input_r<2>)); // steering wheel
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@ -353,7 +370,7 @@ static INPUT_PORTS_START( getaway )
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PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
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PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
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PORT_DIPSETTING( 0x80, DEF_STR( On ) )
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// "DNS04"?
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PORT_START("DSW.1")
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// credit display is shown if both extended plays are on "None"
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@ -398,6 +415,8 @@ void getaway_state::getaway(machine_config &config)
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// TODO: discrete
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}
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/******************************************************************************
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ROM Definitions
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******************************************************************************/
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