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https://github.com/holub/mame
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Written up a bare-bones M50458 OSD video chip device, used by Nintendo Super System HW [Angelo Salese]
This commit is contained in:
Angelo Salese
parent
6fb8919afa
commit
37a8c8f56f
@ -16,6 +16,69 @@ Mitsubishi M50458 OSD chip
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// device type definition
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const device_type M50458 = &device_creator<m50458_device>;
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static ADDRESS_MAP_START( m50458_vram, AS_0, 16, m50458_device )
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AM_RANGE(0x0000, 0x023f) AM_RAM // vram
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AM_RANGE(0x024e, 0x024f) AM_WRITE(vreg_127_w)
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ADDRESS_MAP_END
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// internal GFX ROM (TODO: GFXs in here should be 12x18, not 16x18)
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ROM_START( m50458 )
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ROM_REGION( 0x1200, "m50458", 0 )
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ROM_LOAD("m50458_char.bin", 0x0000, 0x1200, BAD_DUMP CRC(011cc342) SHA1(d5b9f32d6e251b4b25945267d7c68c099bd83e96) )
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ROM_END
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WRITE16_MEMBER( m50458_device::vreg_127_w)
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{
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if(data & 0x20) // RAMERS, display RAM is erased
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{
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int i;
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for(i=0;i<0x120;i++)
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write_word(i,0);
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}
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}
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//-------------------------------------------------
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// rom_region - device-specific ROM region
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//-------------------------------------------------
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const rom_entry *m50458_device::device_rom_region() const
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{
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return ROM_NAME( m50458 );
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}
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//-------------------------------------------------
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// memory_space_config - return a description of
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// any address spaces owned by this device
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//-------------------------------------------------
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const address_space_config *m50458_device::memory_space_config(address_spacenum spacenum) const
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{
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return (spacenum == AS_0) ? &m_space_config : NULL;
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}
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//**************************************************************************
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// INLINE HELPERS
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//**************************************************************************
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//-------------------------------------------------
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// readbyte - read a byte at the given address
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//-------------------------------------------------
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inline UINT16 m50458_device::read_word(offs_t address)
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{
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return space()->read_word(address << 1);
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}
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//-------------------------------------------------
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// writebyte - write a byte at the given address
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//-------------------------------------------------
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inline void m50458_device::write_word(offs_t address, UINT16 data)
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{
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space()->write_word(address << 1, data);
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}
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//**************************************************************************
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// LIVE DEVICE
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@ -26,7 +89,9 @@ const device_type M50458 = &device_creator<m50458_device>;
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//-------------------------------------------------
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m50458_device::m50458_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: device_t(mconfig, M50458, "m50458", tag, owner, clock)
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: device_t(mconfig, M50458, "m50458", tag, owner, clock),
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device_memory_interface(mconfig, *this),
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m_space_config("videoram", ENDIANNESS_LITTLE, 16, 16, 0, NULL, *ADDRESS_MAP_NAME(m50458_vram))
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{
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}
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@ -76,7 +141,7 @@ WRITE_LINE_MEMBER( m50458_device::set_cs_line )
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if(m_reset_line != CLEAR_LINE)
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{
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printf("Reset asserted\n");
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//printf("Reset asserted\n");
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m_cmd_stream_pos = 0;
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m_current_cmd = 0;
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m_osd_state = OSD_SET_ADDRESS;
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@ -108,8 +173,8 @@ WRITE_LINE_MEMBER( m50458_device::set_clock_line )
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m_osd_state = OSD_SET_DATA;
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break;
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case OSD_SET_DATA:
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printf("%04x %04x\n",m_osd_addr,m_current_cmd);
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//printf("%04x %04x\n",m_osd_addr,m_current_cmd);
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write_word(m_osd_addr,m_current_cmd);
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m_osd_addr++;
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/* Presumably wraps at 0x127? */
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if(m_osd_addr > 0x127) { m_osd_addr = 0; }
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@ -122,3 +187,47 @@ WRITE_LINE_MEMBER( m50458_device::set_clock_line )
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}
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}
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}
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//-------------------------------------------------
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// update_screen -
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//-------------------------------------------------
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UINT32 m50458_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
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{
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int x,y;
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UINT8 *pcg = memregion("m50458")->base();
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for(y=0;y<12;y++)
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{
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for(x=0;x<24;x++)
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{
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int xi,yi;
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UINT16 tile;
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tile = read_word(x+y*24);
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for(yi=0;yi<18;yi++)
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{
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for(xi=4;xi<16;xi++) /* TODO: remove 4 / 16 / -4 offset once that the ROM is fixed */
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{
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UINT8 pix;
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UINT8 r,g,b;
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UINT16 offset = ((tile & 0x7f)*36+yi*2);
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if(xi>=8)
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pix = (pcg[offset+1] >> (7-(xi & 0x7))) & 1;
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else
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pix = (pcg[offset+0] >> (7-(xi & 0x7))) & 1;
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r = (tile & 0x100 && pix) ? 0xff : 0x00;
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g = (tile & 0x200 && pix) ? 0xff : 0x00;
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b = (tile & 0x400 && pix) ? 0xff : 0x00;
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bitmap.pix32(y*18+yi,x*12+(xi-4)) = r << 16 | g << 8 | b;
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}
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}
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}
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}
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return 0;
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}
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@ -32,7 +32,8 @@ typedef enum
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// ======================> m50458_device
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class m50458_device : public device_t
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class m50458_device : public device_t,
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public device_memory_interface
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{
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public:
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// construction/destruction
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@ -42,21 +43,31 @@ public:
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WRITE_LINE_MEMBER( write_bit );
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WRITE_LINE_MEMBER( set_cs_line );
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WRITE_LINE_MEMBER( set_clock_line );
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DECLARE_WRITE16_MEMBER(vreg_127_w);
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UINT32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
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virtual const rom_entry *device_rom_region() const;
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protected:
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// device-level overrides
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virtual void device_validity_check(validity_checker &valid) const;
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virtual void device_start();
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virtual void device_reset();
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virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const;
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int m_latch;
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int m_reset_line;
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int m_clock_line;
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int m_current_cmd;
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UINT16 m_current_cmd;
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int m_cmd_stream_pos;
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UINT16 m_osd_addr;
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m50458_state_t m_osd_state;
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private:
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inline UINT16 read_word(offs_t address);
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inline void write_word(offs_t address, UINT16 data);
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const address_space_config m_space_config;
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};
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@ -298,18 +298,22 @@ Contra III CONTRA_III_1 TC574000 CONTRA_III_0 TC574000 GAME1_NSSU
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#include "machine/eeprom.h"
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#include "video/m50458.h"
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#include "includes/snes.h"
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#include "rendlay.h"
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class nss_state : public snes_state
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{
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public:
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nss_state(const machine_config &mconfig, device_type type, const char *tag)
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: snes_state(mconfig, type, tag)
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: snes_state(mconfig, type, tag),
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m_m50458(*this,"m50458")
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{ }
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required_device<m50458_device> m_m50458;
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UINT8 m_wram_wp_flag;
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UINT8 *m_wram;
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UINT8 m_nmi_enable;
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UINT32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
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DECLARE_READ8_MEMBER(spc_ram_100_r);
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DECLARE_WRITE8_MEMBER(spc_ram_100_w);
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@ -321,6 +325,13 @@ public:
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DECLARE_WRITE8_MEMBER(eeprom_w);
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};
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UINT32 nss_state::screen_update( screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect )
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{
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m_m50458->screen_update(screen,bitmap,cliprect);
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return 0;
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}
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static ADDRESS_MAP_START( snes_map, AS_PROGRAM, 8, nss_state )
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AM_RANGE(0x000000, 0x2fffff) AM_READWRITE_LEGACY(snes_r_bank1, snes_w_bank1) /* I/O and ROM (repeats for each bank) */
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@ -715,22 +726,6 @@ static INPUT_PORTS_START( snes )
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#endif
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INPUT_PORTS_END
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static const gfx_layout nss_char_layout_16x18 =
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{
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16,18,
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RGN_FRAC(1,1),
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1,
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{ 0 },
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{ 0, 1, 2, 3, 4, 5, 6, 7,8,9,10,11,12,13,14,15 },
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{ 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16,8*16, 9*16, 10*16, 11*16, 12*16, 13*16, 14*16, 15*16, 16*16,17*16 },
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16*18
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};
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/* decoded for debugging purpose, this will be nuked in the end... */
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static GFXDECODE_START( nss )
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GFXDECODE_ENTRY( "chargen", 0x00000, nss_char_layout_16x18, 0, 1 )
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GFXDECODE_END
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static MACHINE_CONFIG_START( snes, nss_state )
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@ -776,12 +771,20 @@ static MACHINE_CONFIG_DERIVED( nss, snes )
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MCFG_CPU_IO_MAP(bios_io_map)
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MCFG_CPU_VBLANK_INT("screen", nss_vblank_irq)
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/* TODO: the screen should actually superimpose, but for the time being let's just separate outputs for now */
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MCFG_DEFAULT_LAYOUT(layout_dualhsxs)
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MCFG_SCREEN_ADD("osd", RASTER)
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MCFG_SCREEN_REFRESH_RATE(60)
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MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
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MCFG_SCREEN_SIZE(24*12+22, 12*18+22)
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MCFG_SCREEN_VISIBLE_AREA(0*8, 24*12-1, 0*8, 12*18-1)
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MCFG_SCREEN_UPDATE_DRIVER(nss_state,screen_update)
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MCFG_EEPROM_ADD("eeprom", nss_eeprom_intf)
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MCFG_M50458_ADD("m50458",4000000) /* TODO: clock */
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MCFG_GFXDECODE( nss )
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MCFG_PALETTE_LENGTH(2)
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MCFG_MACHINE_START( nss )
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MACHINE_CONFIG_END
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@ -799,10 +802,6 @@ MACHINE_CONFIG_END
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ROM_REGION(0x20000, "bios", 0) /* Bios CPU (what is it?) */ \
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ROM_LOAD("nss-c.dat" , 0x00000, 0x8000, CRC(a8e202b3) SHA1(b7afcfe4f5cf15df53452dc04be81929ced1efb2) ) /* bios */ \
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ROM_LOAD("nss-ic14.02", 0x10000, 0x8000, CRC(e06cb58f) SHA1(62f507e91a2797919a78d627af53f029c7d81477) ) /* bios */ \
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ROM_REGION( 0x1200, "chargen", ROMREGION_ERASEFF ) \
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ROM_LOAD("m50458_char.bin", 0x0000, 0x1200, BAD_DUMP CRC(011cc342) SHA1(d5b9f32d6e251b4b25945267d7c68c099bd83e96) ) \
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ROM_REGION( 0x1000, "m50458_gfx", ROMREGION_ERASEFF ) \
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ROM_LOAD("m50458_char_mod.bin", 0x0000, 0x1000, BAD_DUMP CRC(8c4326ef) SHA1(21a63c5245ff7f3f70cb45e217b3045b19d0d799) ) \
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ROM_REGION( 0x2000, "dspprg", ROMREGION_ERASEFF) \
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ROM_REGION( 0x800, "dspdata", ROMREGION_ERASEFF)
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