// license:MAME // copyright-holders:Robbbert /*************************************************************************** Central Data cd2650 2010-04-08 Skeleton driver. No info available on this computer apart from a few newsletters. The system only uses 1000-14FF for videoram and 17F0-17FF for scratch ram. All other ram is optional. Commands (must be in uppercase): A Examine memory; press C to alter memory B Set breakpoint? C View breakpoint? D Dump to tape E Execute I ? L Load R ? V Verify? Press Esc to exit most commands. TODO - Lots, probably. The computer is a complete mystery. No manuals or schematics exist. - Cassette doesn't work. ****************************************************************************/ #include "emu.h" #include "cpu/s2650/s2650.h" #include "machine/keyboard.h" #include "imagedev/snapquik.h" #include "imagedev/cassette.h" #include "sound/wave.h" #include "sound/beep.h" #define KEYBOARD_TAG "keyboard" class cd2650_state : public driver_device { public: cd2650_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag), m_p_videoram(*this, "videoram"), m_maincpu(*this, "maincpu"), m_beep(*this, "beeper"), m_cass(*this, "cassette") { } DECLARE_READ8_MEMBER(keyin_r); DECLARE_WRITE8_MEMBER(beep_w); DECLARE_WRITE8_MEMBER(kbd_put); DECLARE_READ8_MEMBER(cass_r); DECLARE_WRITE_LINE_MEMBER(cass_w); DECLARE_QUICKLOAD_LOAD_MEMBER(cd2650); const UINT8 *m_p_chargen; UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect); required_shared_ptr m_p_videoram; private: UINT8 m_term_data; virtual void machine_reset(); virtual void video_start(); required_device m_maincpu; required_device m_beep; required_device m_cass; }; WRITE8_MEMBER( cd2650_state::beep_w ) { if (data & 7) m_beep->set_state(BIT(data, 3)); } WRITE_LINE_MEMBER( cd2650_state::cass_w ) { m_cass->output(state ? -1.0 : +1.0); } READ8_MEMBER( cd2650_state::cass_r ) { return (m_cass->input() > 0.03) ? 1 : 0; } READ8_MEMBER( cd2650_state::keyin_r ) { UINT8 ret = m_term_data; m_term_data = ret | 0x80; return ret; } static ADDRESS_MAP_START(cd2650_mem, AS_PROGRAM, 8, cd2650_state) ADDRESS_MAP_UNMAP_HIGH AM_RANGE( 0x0000, 0x03ff) AM_ROM AM_REGION("roms", 0) AM_RANGE( 0x1000, 0x7fff) AM_RAM AM_SHARE("videoram") ADDRESS_MAP_END static ADDRESS_MAP_START( cd2650_io, AS_IO, 8, cd2650_state) ADDRESS_MAP_UNMAP_HIGH //AM_RANGE(0x80, 0x84) disk i/o AM_RANGE(S2650_DATA_PORT,S2650_DATA_PORT) AM_READWRITE(keyin_r, beep_w) AM_RANGE(S2650_SENSE_PORT, S2650_SENSE_PORT) AM_READ(cass_r) ADDRESS_MAP_END /* Input ports */ static INPUT_PORTS_START( cd2650 ) INPUT_PORTS_END void cd2650_state::machine_reset() { m_term_data = 0x80; m_beep->set_frequency(950); /* guess */ m_beep->set_state(0); } void cd2650_state::video_start() { m_p_chargen = memregion("chargen")->base(); } UINT32 cd2650_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { /* The video is unusual in that the characters in each line are spaced at 16 bytes in memory, thus line 1 starts at 1000, line 2 at 1001, etc. There are 16 lines of 80 characters. Further, the letters have bit 6 set low, thus the range is 01 to 1A. When the bottom of the screen is reached, it does not scroll, it just wraps around. */ UINT16 offset = 0; UINT8 y,ra,chr,gfx; UINT16 sy=0,x,mem; for (y = 0; y < 16; y++) { for (ra = 0; ra < 10; ra++) { UINT16 *p = &bitmap.pix16(sy++); for (x = 0; x < 80; x++) { gfx = 0; if ((ra) && (ra < 9)) { mem = offset + y + (x<<4); if (mem > 0x4ff) mem -= 0x500; chr = m_p_videoram[mem] & 0x3f; gfx = m_p_chargen[(BITSWAP8(chr,7,6,2,1,0,3,4,5)<<3) | (ra-1) ]; } /* Display a scanline of a character */ *p++ = BIT(gfx, 7); *p++ = BIT(gfx, 6); *p++ = BIT(gfx, 5); *p++ = BIT(gfx, 4); *p++ = BIT(gfx, 3); *p++ = BIT(gfx, 2); *p++ = BIT(gfx, 1); *p++ = BIT(gfx, 0); } } } return 0; } /* F4 Character Displayer */ static const gfx_layout cd2650_charlayout = { 8, 8, /* 8 x 8 characters */ 192, /* 64 characters in char.rom + 128 characters in char2.rom */ 1, /* 1 bits per pixel */ { 0 }, /* no bitplanes */ /* x offsets */ { 0, 1, 2, 3, 4, 5, 6, 7 }, /* y offsets */ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 }, 8*8 /* every char takes 8 bytes */ }; static GFXDECODE_START( cd2650 ) GFXDECODE_ENTRY( "chargen", 0x0000, cd2650_charlayout, 0, 1 ) GFXDECODE_END WRITE8_MEMBER( cd2650_state::kbd_put ) { if (data) m_term_data = data; } QUICKLOAD_LOAD_MEMBER( cd2650_state, cd2650 ) { int i, result = IMAGE_INIT_FAIL; int quick_length = image.length(); if (quick_length < 0x1500) { image.seterror(IMAGE_ERROR_INVALIDIMAGE, "File too short"); image.message(" File too short"); } else if (quick_length > 0x8000) { image.seterror(IMAGE_ERROR_INVALIDIMAGE, "File too long"); image.message(" File too long"); } else { dynamic_buffer quick_data(quick_length); int read_ = image.fread( quick_data, quick_length); if (read_ != quick_length) { image.seterror(IMAGE_ERROR_INVALIDIMAGE, "Cannot read the file"); image.message(" Cannot read the file"); } else if (quick_data[0] != 0x40) { image.seterror(IMAGE_ERROR_INVALIDIMAGE, "Invalid header"); image.message(" Invalid header"); } else { int exec_addr = quick_data[1] * 256 + quick_data[2]; if (exec_addr >= quick_length) { image.seterror(IMAGE_ERROR_INVALIDIMAGE, "Exec address beyond end of file"); image.message(" Exec address beyond end of file"); } else { // do not overwite system area (17E0-17FF) otherwise chess3 has problems read_ = 0x17e0; if (quick_length < 0x17e0) read_ = quick_length; for (i = 0x1500; i < read_; i++) m_p_videoram[i-0x1000] = quick_data[i]; if (quick_length > 0x17ff) for (i = 0x1800; i < quick_length; i++) m_p_videoram[i-0x1000] = quick_data[i]; /* display a message about the loaded quickload */ image.message(" Quickload: size=%04X : exec=%04X",quick_length,exec_addr); // Start the quickload m_maincpu->set_state_int(S2650_PC, exec_addr); result = IMAGE_INIT_PASS; } } } return result; } static MACHINE_CONFIG_START( cd2650, cd2650_state ) /* basic machine hardware */ MCFG_CPU_ADD("maincpu",S2650, XTAL_1MHz) MCFG_CPU_PROGRAM_MAP(cd2650_mem) MCFG_CPU_IO_MAP(cd2650_io) MCFG_S2650_FLAG_HANDLER(WRITELINE(cd2650_state, cass_w)) /* video hardware */ MCFG_SCREEN_ADD("screen", RASTER) MCFG_SCREEN_REFRESH_RATE(50) MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */ MCFG_SCREEN_UPDATE_DRIVER(cd2650_state, screen_update) MCFG_SCREEN_SIZE(640, 160) MCFG_SCREEN_VISIBLE_AREA(0, 639, 0, 159) MCFG_SCREEN_PALETTE("palette") MCFG_GFXDECODE_ADD("gfxdecode", "palette", cd2650) MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette") /* quickload */ MCFG_QUICKLOAD_ADD("quickload", cd2650_state, cd2650, "pgm", 1) /* Sound */ MCFG_SPEAKER_STANDARD_MONO("mono") MCFG_SOUND_WAVE_ADD(WAVE_TAG, "cassette") MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25) MCFG_SOUND_ADD("beeper", BEEP, 0) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50) /* Devices */ MCFG_DEVICE_ADD(KEYBOARD_TAG, GENERIC_KEYBOARD, 0) MCFG_GENERIC_KEYBOARD_CB(WRITE8(cd2650_state, kbd_put)) MCFG_CASSETTE_ADD( "cassette", default_cassette_interface ) MACHINE_CONFIG_END /* ROM definition */ ROM_START( cd2650 ) ROM_REGION( 0x0400, "roms", 0 ) ROM_LOAD( "cd2650.rom", 0x0000, 0x0400, CRC(5397328e) SHA1(7106fdb60e1ad2bc5e8e45527f348c23296e8d6a)) ROM_REGION( 0x0600, "chargen", 0 ) ROM_LOAD( "char.rom", 0x0000, 0x0200, CRC(9b75db2a) SHA1(4367c01afa503d7cba0c38078fde0b95392c6c2c)) ROM_LOAD_OPTIONAL( "char2.rom", 0x0200, 0x0400, CRC(b450eea8) SHA1(c1bdba52c2dc5698cad03b6b884b942a083465ed)) // not used // various unused roms found on Amigan site ROM_REGION( 0xc900, "user1", 0 ) ROM_LOAD_OPTIONAL( "01a_cd_boots.bin", 0x0000, 0x0200, CRC(5336c62f) SHA1(e94cf7be01ea806ff7c7b90aee1a4e88f4f1ba9f)) ROM_LOAD_OPTIONAL( "01a_cd_dos.bin", 0x0200, 0x2000, CRC(3f177cdd) SHA1(01afd77ad2f065158cbe032aa26682cb20afe7d8)) ROM_LOAD_OPTIONAL( "01a_cd_pop.bin", 0x2200, 0x1000, CRC(d8f44f11) SHA1(605ab5a045290fa5b99ff4fc8fbfa2a3f202578f)) ROM_LOAD_OPTIONAL( "01b_cd_alp.bin", 0x3200, 0x2a00, CRC(b05568bb) SHA1(29e74633c0cd731c0be25313288cfffdae374236)) ROM_LOAD_OPTIONAL( "01b_cd_basic.bin", 0x5c00, 0x3b00, CRC(0cf1e3d8) SHA1(3421e679c238aeea49cd170b34a6f344da4770a6)) ROM_LOAD_OPTIONAL( "01b_cd_mon_m.bin", 0x9700, 0x0400, CRC(f6f19c08) SHA1(1984d85d57fc2a6c5a3bd51fbc58540d7129a0ae)) ROM_LOAD_OPTIONAL( "01b_cd_mon_o.bin", 0x9b00, 0x0400, CRC(9d40b4dc) SHA1(35cffcbd983b7b37c878a15af44100568d0659d1)) ROM_LOAD_OPTIONAL( "02b_cd_alp.bin", 0x9f00, 0x2a00, CRC(a66b7f32) SHA1(2588f9244b0ec6b861dcebe666d37d3fa88dd043)) ROM_END /* Driver */ /* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */ COMP( 1977, cd2650, 0, 0, cd2650, cd2650, driver_device, 0, "Central Data", "CD 2650", 0 )