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misc/ncarrera.cpp driver: Added more documentation, technical notes,
more cleanups, and fixed copyright.
This commit is contained in:
Roberto Fresca
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commit
133e9f3acb
@ -1,17 +1,36 @@
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// license:BSD-3-Clause
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// copyright-holders: Roberto Fresca, Grull Osgo
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// copyright-holders: Roberto Fresca, Grull Osgo, David Haywood
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/***************************************************************************************************
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New Carrera, V2000.
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New Carrera, Version 2000.
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JT Amusement
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This game uses a newer 'TYPE C-2000' board with a 'Rania Original 2000 Type 8515'
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riser board (the Z80 and MC6845 have been moved here along with a AT90S8515 MCU)
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This is a stealth gambling machine disguised as a standard arcade game. Players initially interact
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with what appears to be a legitimate arcade game, until they enter a hidden password. Once activated,
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the game reveals its true nature: a fully functional video slots gambling game.
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The game's code resides in a PSD312-B (an MCU peripheral), while an AT90S8515 MCU handles:
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* Screen rendering
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* Symbol placement
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* Reel animation
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* Input processing
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* Management of hardcoded NVRAM values (game configuration & settings)
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Since we lack the original MCU firmware, we've simulated its functions by replicating register-level
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behavior based on how the game code interacts with the hardware.
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For a complete and accurate emulation, we need the MCU's contents, specifically the EPROM and FLASH data.
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Tech notes:
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This game uses a newer 'TYPE C-2000' board with a 'Rania Original 2000 Type 8515'
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riser board (the Z80 and MC6845 have been moved here along with a AT90S8515 MCU)
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- The MCU behavior has been simulated to make the game playable.
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- The MCU has full range memory access, so it can read ROM and Read/Write NVRAM.
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- The MCU manages reels display animation.
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@ -99,8 +118,6 @@ private:
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std::unique_ptr<uint8_t[]> m_nvram8;
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uint16_t const reel_base = 0x2910;
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//uint16_t const reel2_base = 0x292b;
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//uint16_t const reel3_base = 0x2946;
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uint8_t m_vp = 0;
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uint8_t m_frame = 0;
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@ -109,8 +126,6 @@ private:
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int m_delay = 0;
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int m_buffin0 = 0;
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int m_buffin1 = 0;
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};
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@ -126,6 +141,51 @@ void ncarrera_state::machine_start()
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}
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/*************************************************
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* Video Hardware *
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*************************************************/
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uint32_t ncarrera_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
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{
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int count = 0;
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for (int y = 0; y < 32; y++)
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{
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for (int x = 0; x < 64; x++)
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{
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int tile = m_tileram[count & 0x7ff] | m_tileram[(count & 0x7ff) + 0x800] << 8;
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m_gfxdecode->gfx(0)->opaque(bitmap, cliprect, tile, 0, 0, 0, x * 8, y * 8);
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count++;
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}
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}
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return 0;
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}
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void ncarrera_state::palette(palette_device &palette) const
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{
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uint8_t const *const color_prom = memregion("proms")->base();
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for (int i = 0; i < 0x20; ++i)
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{
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int bit0, bit1;
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int const br_bit0 = BIT(color_prom[i], 7);
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int const br_bit1 = BIT(color_prom[i], 6);
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bit0 = BIT(color_prom[i], 0);
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bit1 = BIT(color_prom[i], 3);
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int const b = 0x0e * br_bit0 + 0x1f * br_bit1 + 0x43 * bit0 + 0x8f * bit1;
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bit0 = BIT(color_prom[i], 1);
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bit1 = BIT(color_prom[i], 4);
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int const g = 0x0e * br_bit0 + 0x1f * br_bit1 + 0x43 * bit0 + 0x8f * bit1;
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bit0 = BIT(color_prom[i], 2);
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bit1 = BIT(color_prom[i], 5);
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int const r = 0x0e * br_bit0 + 0x1f * br_bit1 + 0x43 * bit0 + 0x8f * bit1;
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palette.set_pen_color(i, rgb_t(r, g, b));
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}
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}
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/*************************************************
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* Memory map information *
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*************************************************/
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@ -154,15 +214,11 @@ void ncarrera_state::io_map(address_map &map)
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uint8_t ncarrera_state::unknown_r()
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{
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// popmessage("portB_read:%02x");
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// logerror("portB_read:%02x\n");
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return machine().rand();
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}
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void ncarrera_state::porta_w(uint8_t data)
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{
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// if(data != 0)
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// popmessage("porta:%02x", data);
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}
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uint16_t ncarrera_state::inc_idx(uint16_t& index, uint8_t i)
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@ -202,8 +258,8 @@ void ncarrera_state::print_reels(uint8_t data)
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reels_active[2] = (m_nvram8[0x16f] == 0x0e) || (m_nvram8[0x16f] == 0x13) || (m_nvram8[0x16f] == 0x14) || (m_nvram8[0x16f] == 0x11);
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// index config
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auto setup_indices = [&](uint8_t reel_id) -> uint16_t
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{
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auto setup_indices = [&](uint8_t reel_id) -> uint16_t
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{
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int16_t step = (m_nvram8[0x156 + reel_id] + (data / 3) - 1) % 0x1b;
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return static_cast<uint16_t>((step < 0) ? 0x1a : step);
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};
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@ -403,7 +459,7 @@ static INPUT_PORTS_START( ncarrera )
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PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("1-7") PORT_CODE(KEYCODE_G)
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PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE2 )
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// DIP switched are harcoded in NVRAM.
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// DIP switches are harcoded in NVRAM.
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INPUT_PORTS_END
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@ -427,56 +483,12 @@ static const gfx_layout tiles8x8_layout =
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/*************************************************
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* Graphics Decode Information *
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*************************************************/
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static GFXDECODE_START( gfx_carrera )
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GFXDECODE_ENTRY( "tiles", 0, tiles8x8_layout, 0, 1 )
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GFXDECODE_END
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/*************************************************
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* Video Hardware *
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*************************************************/
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uint32_t ncarrera_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
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{
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int count = 0;
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for (int y = 0; y < 32; y++)
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{
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for (int x = 0; x < 64; x++)
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{
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int tile = m_tileram[count & 0x7ff] | m_tileram[(count & 0x7ff) + 0x800] << 8;
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m_gfxdecode->gfx(0)->opaque(bitmap, cliprect, tile, 0, 0, 0, x * 8, y * 8);
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count++;
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}
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}
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return 0;
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}
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void ncarrera_state::palette(palette_device &palette) const
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{
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uint8_t const *const color_prom = memregion("proms")->base();
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for (int i = 0; i < 0x20; ++i)
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{
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int bit0, bit1;
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int const br_bit0 = BIT(color_prom[i], 7);
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int const br_bit1 = BIT(color_prom[i], 6);
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bit0 = BIT(color_prom[i], 0);
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bit1 = BIT(color_prom[i], 3);
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int const b = 0x0e * br_bit0 + 0x1f * br_bit1 + 0x43 * bit0 + 0x8f * bit1;
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bit0 = BIT(color_prom[i], 1);
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bit1 = BIT(color_prom[i], 4);
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int const g = 0x0e * br_bit0 + 0x1f * br_bit1 + 0x43 * bit0 + 0x8f * bit1;
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bit0 = BIT(color_prom[i], 2);
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bit1 = BIT(color_prom[i], 5);
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int const r = 0x0e * br_bit0 + 0x1f * br_bit1 + 0x43 * bit0 + 0x8f * bit1;
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palette.set_pen_color(i, rgb_t(r, g, b));
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}
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}
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/*************************************************
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* Machine Drivers *
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*************************************************/
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