diff options
Diffstat (limited to 'src/devices/bus/a2bus/a2videoterm.cpp')
-rw-r--r-- | src/devices/bus/a2bus/a2videoterm.cpp | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/src/devices/bus/a2bus/a2videoterm.cpp b/src/devices/bus/a2bus/a2videoterm.cpp new file mode 100644 index 00000000000..d29c00d2006 --- /dev/null +++ b/src/devices/bus/a2bus/a2videoterm.cpp @@ -0,0 +1,377 @@ +// license:BSD-3-Clause +// copyright-holders:R. Belmont +/********************************************************************* + + a2videoterm.c + + Implementation of the Videx VideoTerm 80-column card + + Notes (from Videoterm user's manual, which contains + schematics and firmware source listings). + + C0nX: C0n0 is 6845 register address, + C0n1 is 6845 register data. + + Bits 2 & 3 on any access to C0nX set the VRAM page at CC00. + + C800-CBFF: ROM + CC00-CDFF: VRAM window + + TODO: + Cursor is probably not completely right. + Add font ROM select. + +*********************************************************************/ + +#include "a2videoterm.h" +#include "includes/apple2.h" + + +/*************************************************************************** + PARAMETERS +***************************************************************************/ + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +const device_type A2BUS_VIDEOTERM = &device_creator<a2bus_videoterm_device>; +const device_type A2BUS_IBSAP16 = &device_creator<a2bus_ap16_device>; +const device_type A2BUS_IBSAP16ALT = &device_creator<a2bus_ap16alt_device>; +const device_type A2BUS_VTC1 = &device_creator<a2bus_vtc1_device>; +const device_type A2BUS_VTC2 = &device_creator<a2bus_vtc2_device>; +const device_type A2BUS_AEVIEWMASTER80 = &device_creator<a2bus_aevm80_device>; + +#define VIDEOTERM_ROM_REGION "vterm_rom" +#define VIDEOTERM_GFX_REGION "vterm_gfx" +#define VIDEOTERM_SCREEN_NAME "vterm_screen" +#define VIDEOTERM_MC6845_NAME "mc6845_vterm" + +#define MDA_CLOCK 16257000 + +MACHINE_CONFIG_FRAGMENT( a2videoterm ) + MCFG_SCREEN_ADD( VIDEOTERM_SCREEN_NAME, RASTER) // 560x216? (80x24 7x9 characters) + MCFG_SCREEN_RAW_PARAMS(MDA_CLOCK, 882, 0, 720, 370, 0, 350 ) + MCFG_SCREEN_UPDATE_DEVICE( VIDEOTERM_MC6845_NAME, mc6845_device, screen_update ) + + MCFG_MC6845_ADD(VIDEOTERM_MC6845_NAME, MC6845, VIDEOTERM_SCREEN_NAME, MDA_CLOCK/9) + MCFG_MC6845_SHOW_BORDER_AREA(false) + MCFG_MC6845_CHAR_WIDTH(8) + MCFG_MC6845_UPDATE_ROW_CB(a2bus_videx80_device, crtc_update_row) + MCFG_MC6845_OUT_VSYNC_CB(WRITELINE(a2bus_videx80_device, vsync_changed)) +MACHINE_CONFIG_END + +ROM_START( a2videoterm ) + ROM_REGION(0x400, VIDEOTERM_ROM_REGION, 0) + ROM_LOAD( "videx videoterm rom 2.4.bin", 0x000000, 0x000400, CRC(bbe3bb28) SHA1(bb653836e84850ce3197f461d4e19355f738cfbf) ) + + ROM_REGION(0x5000, VIDEOTERM_GFX_REGION, 0) + ROM_LOAD( "videx videoterm character rom normal.bin", 0x000000, 0x000800, CRC(87f89f08) SHA1(410b54f33d13c82e3857f1be906d93a8c5b8d321) ) + ROM_LOAD( "videx videoterm character rom normal uppercase.bin", 0x000800, 0x000800, CRC(3d94a7a4) SHA1(5518254f24bc945aab13bc71ecc9526d6dd8e033) ) + ROM_LOAD( "videx videoterm character rom apl.bin", 0x001000, 0x000800, CRC(1adb704e) SHA1(a95df910eca33188cacee333b1325aa47edbcc25) ) + ROM_LOAD( "videx videoterm character rom epson.bin", 0x001800, 0x000800, CRC(0c6ef8d0) SHA1(db72c0c120086f1aa4a87120c5d7993c4a9d3a18) ) + ROM_LOAD( "videx videoterm character rom french.bin", 0x002000, 0x000800, CRC(266aa837) SHA1(2c6b4e9d342dbb2de8e278740f11925a9d8c6616) ) + ROM_LOAD( "videx videoterm character rom german.bin", 0x002800, 0x000800, CRC(df7324fa) SHA1(0ce58d2ffadbebc8db9f85bbb9a08a4f142af682) ) + ROM_LOAD( "videx videoterm character rom katakana.bin", 0x003000, 0x000800, CRC(b728690e) SHA1(e018fa66b0ff560313bb35757c9ce7adecae0c3a) ) + ROM_LOAD( "videx videoterm character rom spanish.bin", 0x003800, 0x000800, CRC(439eac08) SHA1(d6f9f8eb7702440d9ae39129ea4f480b80fc4608) ) + ROM_LOAD( "videx videoterm character rom super and subscript.bin", 0x004000, 0x000800, CRC(08b7c538) SHA1(7f4029d97be05680fe695debe07cea07666419e0) ) + ROM_LOAD( "videx videoterm character rom symbol.bin", 0x004800, 0x000800, CRC(82bce582) SHA1(29dfa8c5257dbf25651c6bffa9cdb453482aa70e) ) +ROM_END + +ROM_START( a2ap16 ) + ROM_REGION(0x2000, VIDEOTERM_ROM_REGION, 0) + ROM_LOAD( "space 84 video ap16.bin", 0x000000, 0x002000, CRC(0e188da2) SHA1(9a29250b6cc7b576fdc67769944de35e6f54b9d5) ) + + ROM_REGION(0x4000, VIDEOTERM_GFX_REGION, 0) + ROM_LOAD( "space 84 video chargen ap16.bin", 0x000000, 0x002000, CRC(b9447088) SHA1(19c95f91a67b948fc00a14621d574d629479d451) ) +ROM_END + +ROM_START( a2ap16alt ) + ROM_REGION(0x1000, VIDEOTERM_ROM_REGION, 0) + ROM_LOAD( "unknown apple ii clone video 3.bin", 0x000000, 0x001000, CRC(af1226d2) SHA1(18a569f417a47f54a17bd9046d306a54b46ed049) ) + + ROM_REGION(0x4000, VIDEOTERM_GFX_REGION, 0) + ROM_LOAD( "unknown apple ii clone video 1.bin", 0x000000, 0x001000, CRC(cf84811c) SHA1(135f4f35607dd74941f0a3cae813227bf8a8a020) ) +ROM_END + +ROM_START( vtc1 ) + ROM_REGION(0x800, VIDEOTERM_ROM_REGION, 0) + ROM_LOAD( "10.ic10.bin", 0x000000, 0x000800, CRC(ddbbc2fb) SHA1(15d6142b177b47c016f2745e1d95767b440d77c7) ) + + ROM_REGION(0x1000, VIDEOTERM_GFX_REGION, 0) + ROM_LOAD( "9.ic9.bin", 0x000000, 0x000800, CRC(094670f1) SHA1(aefae76fb07740d042cf294f01424efa7cc7a199) ) + ROM_LOAD( "8.ic8.bin", 0x000800, 0x000800, CRC(fbd98d77) SHA1(0d9b1c3917e23ca35d5fbd405f05ff6e87122b92) ) +ROM_END + +ROM_START( vtc2 ) + ROM_REGION(0x800, VIDEOTERM_ROM_REGION, 0) + ROM_LOAD( "6.ic6.bin", 0x000000, 0x000800, CRC(5776fa24) SHA1(19f69011ed7d2551c39d5c1cac1f5a2defc8f8fb) ) + + ROM_REGION(0x1000, VIDEOTERM_GFX_REGION, 0) + ROM_LOAD( "5.ic5.bin", 0x000000, 0x000800, CRC(aafa7085) SHA1(54d7c358f1927ba8f3b61145215a806d8cb6b673) ) + ROM_LOAD( "4.ic4.bin", 0x000800, 0x000800, CRC(8a497a48) SHA1(50c3df528109c65491a001ec74e50351a652c1fd) ) +ROM_END + +ROM_START( a2aevm80 ) + ROM_REGION(0x800, VIDEOTERM_ROM_REGION, 0) + ROM_LOAD( "ae viewmaster 80 rom.bin", 0x000000, 0x000800, CRC(62a4b111) SHA1(159bf7c4add1435be215fddb648c0743fbcc49b5) ) + + ROM_REGION(0x1000, VIDEOTERM_GFX_REGION, 0) + ROM_LOAD( "ae viewmaster 80 video rom.bin", 0x000000, 0x000800, CRC(4801ab90) SHA1(f90658ffee7740f3cb30ecef2e151f7dc6098833) ) +ROM_END + +/*************************************************************************** + FUNCTION PROTOTYPES +***************************************************************************/ + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor a2bus_videx80_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( a2videoterm ); +} + +//------------------------------------------------- +// rom_region - device-specific ROM region +//------------------------------------------------- + +const rom_entry *a2bus_videoterm_device::device_rom_region() const +{ + return ROM_NAME( a2videoterm ); +} + +const rom_entry *a2bus_ap16_device::device_rom_region() const +{ + return ROM_NAME( a2ap16 ); +} + +const rom_entry *a2bus_ap16alt_device::device_rom_region() const +{ + return ROM_NAME( a2ap16alt ); +} + +const rom_entry *a2bus_vtc1_device::device_rom_region() const +{ + return ROM_NAME( vtc1 ); +} + +const rom_entry *a2bus_vtc2_device::device_rom_region() const +{ + return ROM_NAME( vtc2 ); +} + +const rom_entry *a2bus_aevm80_device::device_rom_region() const +{ + return ROM_NAME( a2aevm80 ); +} + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +a2bus_videx80_device::a2bus_videx80_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) : + device_t(mconfig, type, name, tag, owner, clock, shortname, source), + device_a2bus_card_interface(mconfig, *this), + m_crtc(*this, VIDEOTERM_MC6845_NAME), + m_palette(*this, ":palette") +{ +} + +a2bus_videoterm_device::a2bus_videoterm_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + a2bus_videx80_device(mconfig, A2BUS_VIDEOTERM, "Videx VideoTerm", tag, owner, clock, "a2vidtrm", __FILE__) +{ +} + +a2bus_ap16_device::a2bus_ap16_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + a2bus_videx80_device(mconfig, A2BUS_IBSAP16, "IBS AP-16 80 column card", tag, owner, clock, "a2ap16", __FILE__) +{ +} + +a2bus_ap16alt_device::a2bus_ap16alt_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + a2bus_videx80_device(mconfig, A2BUS_IBSAP16ALT, "IBS AP-16 80 column card (alt. version)", tag, owner, clock, "a2ap16a", __FILE__) +{ +} + +a2bus_vtc1_device::a2bus_vtc1_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + a2bus_videx80_device(mconfig, A2BUS_VTC1, "Unknown VideoTerm clone #1", tag, owner, clock, "a2vtc1", __FILE__) +{ +} + +a2bus_vtc2_device::a2bus_vtc2_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + a2bus_videx80_device(mconfig, A2BUS_VTC2, "Unknown VideoTerm clone #2", tag, owner, clock, "a2vtc2", __FILE__) +{ +} + +a2bus_aevm80_device::a2bus_aevm80_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + a2bus_videx80_device(mconfig, A2BUS_AEVIEWMASTER80, "Applied Engineering Viewmaster 80", tag, owner, clock, "a2aevm80", __FILE__) +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void a2bus_videx80_device::device_start() +{ + // set_a2bus_device makes m_slot valid + set_a2bus_device(); + + m_rom = device().machine().root_device().memregion(this->subtag(VIDEOTERM_ROM_REGION).c_str())->base(); + + m_chrrom = device().machine().root_device().memregion(this->subtag(VIDEOTERM_GFX_REGION).c_str())->base(); + + memset(m_ram, 0, 4*512); + + save_item(NAME(m_ram)); + save_item(NAME(m_framecnt)); + save_item(NAME(m_rambank)); +} + +void a2bus_videx80_device::device_reset() +{ + m_rambank = 0; + m_framecnt = 0; +} + + +/*------------------------------------------------- + read_c0nx - called for reads from this card's c0nx space +-------------------------------------------------*/ + +UINT8 a2bus_videx80_device::read_c0nx(address_space &space, UINT8 offset) +{ +// printf("Read c0n%x (PC=%x)\n", offset, space.device().safe_pc()); + + m_rambank = ((offset>>2) & 3) * 512; + + if (offset == 1) + { + return m_crtc->register_r(space, offset); // status_r? + } + + return 0xff; +} + + +/*------------------------------------------------- + write_c0nx - called for writes to this card's c0nx space +-------------------------------------------------*/ + +void a2bus_videx80_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data) +{ +// printf("Write %02x to c0n%x (PC=%x)\n", data, offset, space.device().safe_pc()); + + if (offset == 0) + { + m_crtc->address_w(space, offset, data); + } + else if (offset == 1) + { + m_crtc->register_w(space, offset, data); + } + + m_rambank = ((offset>>2) & 3) * 512; +} + +/*------------------------------------------------- + read_cnxx - called for reads from this card's cnxx space +-------------------------------------------------*/ + +UINT8 a2bus_videx80_device::read_cnxx(address_space &space, UINT8 offset) +{ + return m_rom[offset+0x300]; +} + +UINT8 a2bus_ap16_device::read_cnxx(address_space &space, UINT8 offset) +{ + return m_rom[offset+0x1f00]; +} + +UINT8 a2bus_ap16alt_device::read_cnxx(address_space &space, UINT8 offset) +{ + return m_rom[offset+0xb00]; +} + +/*------------------------------------------------- + write_cnxx - called for writes to this card's cnxx space + the firmware writes here to switch in our $C800 a lot +-------------------------------------------------*/ +void a2bus_videx80_device::write_cnxx(address_space &space, UINT8 offset, UINT8 data) +{ +} + +/*------------------------------------------------- + read_c800 - called for reads from this card's c800 space +-------------------------------------------------*/ + +UINT8 a2bus_videx80_device::read_c800(address_space &space, UINT16 offset) +{ + // ROM at c800-cbff + // bankswitched RAM at cc00-cdff + if (offset < 0x400) + { +// printf("Read VRAM at %x = %02x\n", offset+m_rambank, m_ram[offset + m_rambank]); + return m_rom[offset]; + } + else + { + return m_ram[(offset-0x400) + m_rambank]; + } +} + +/*------------------------------------------------- + write_c800 - called for writes to this card's c800 space +-------------------------------------------------*/ +void a2bus_videx80_device::write_c800(address_space &space, UINT16 offset, UINT8 data) +{ + if (offset >= 0x400) + { +// printf("%02x to VRAM at %x\n", data, offset-0x400+m_rambank); + m_ram[(offset-0x400) + m_rambank] = data; + } +} + +MC6845_UPDATE_ROW( a2bus_videx80_device::crtc_update_row ) +{ + const rgb_t *palette = m_palette->palette()->entry_list_raw(); + UINT32 *p = &bitmap.pix32(y); + UINT16 chr_base = ra; //( ra & 0x08 ) ? 0x800 | ( ra & 0x07 ) : ra; + int i; + + for ( i = 0; i < x_count; i++ ) + { + UINT16 offset = ( ma + i ) & 0x7ff; + UINT8 chr = m_ram[ offset ]; + UINT8 data = m_chrrom[ chr_base + chr * 16 ]; + UINT8 fg = 15; + UINT8 bg = 0; + + if ( i == cursor_x ) + { + if ( m_framecnt & 0x08 ) + { + data = 0xFF; + } + } + + *p = palette[( data & 0x80 ) ? fg : bg]; p++; + *p = palette[( data & 0x40 ) ? fg : bg]; p++; + *p = palette[( data & 0x20 ) ? fg : bg]; p++; + *p = palette[( data & 0x10 ) ? fg : bg]; p++; + *p = palette[( data & 0x08 ) ? fg : bg]; p++; + *p = palette[( data & 0x04 ) ? fg : bg]; p++; + *p = palette[( data & 0x02 ) ? fg : bg]; p++; + *p = palette[( data & 0x01 ) ? fg : bg]; p++; + } +} + +WRITE_LINE_MEMBER( a2bus_videx80_device::vsync_changed ) +{ + if ( state ) + { + m_framecnt++; + } +} |