/*************************************************************************** MSM6222B A somewhat hd44780-compatible LCD controller. The -01 variant has a fixed cgrom, the other variants are mask-programmed. **************************************************************************** Copyright Olivier Galibert All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name 'MAME' nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY OLIVIER GALIBERT ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL OLIVIER GALIBERT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ***************************************************************************/ #include "emu.h" #include "msm6222b.h" const device_type MSM6222B = &device_creator; const device_type MSM6222B_01 = &device_creator; ROM_START( msm6222b_01 ) ROM_REGION( 0x1000, "cgrom", 0 ) ROM_LOAD( "msm6222b-01.bin", 0x0000, 0x1000, CRC(8ffa8521) SHA1(e108b520e6d20459a7bbd5958bbfa1d551a690bd) ) ROM_END msm6222b_device::msm6222b_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) { } msm6222b_device::msm6222b_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, MSM6222B, "msm6222b-xx", tag, owner, clock, "msm6222b", __FILE__) { } msm6222b_01_device::msm6222b_01_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : msm6222b_device(mconfig, MSM6222B_01, "msm6222b-01", tag, owner, clock, "msm6222b", __FILE__) { } const rom_entry *msm6222b_01_device::device_rom_region() const { return ROM_NAME(msm6222b_01); } void msm6222b_device::device_start() { if(memregion("cgrom")) cgrom = memregion("cgrom")->base(); else if(m_region) cgrom = m_region->base(); else cgrom = NULL; memset(cgram, 0, sizeof(cgram)); memset(ddram, 0x20, sizeof(ddram)); cursor_direction = true; cursor_blinking = false; display_on = false; two_line = false; cursor_on = false; shift_on_write = false; double_height = false; adc = 0x00; shift = 0; } void msm6222b_device::control_w(UINT8 data) { int cmd; for(cmd = 7; cmd >= 0 && !(data & (1<= 40 && adr < 64) || adr >= 64+40) adr = -1; if(adr >= 64) adr += 40-64; } else { if(adr >= 80) adr = -1; } if(adr != -1) { ddram[adr] = data; if(shift_on_write) shift_step(cursor_direction); else cursor_step(cursor_direction); } } else { if(adc < 8*8) { cgram[adc] = data; cursor_step(cursor_direction); } } } void msm6222b_device::cursor_step(bool direction) { if(direction) { if(adc & 0x80) { if(two_line && adc == (0x80|39)) adc = 0x80|64; else if(two_line && adc == (0x80|(64+39))) adc = 0x80; else if((!two_line) && adc == (0x80|79)) adc = 0x80; else adc++; } else { if(adc == 8*8-1) adc = 0x00; else adc++; } } else { if(adc & 0x80) { if(adc == 0x80) adc = two_line ? 0x80|(64+39) : 0x80|79; else if(two_line && adc == (0x80|64)) adc = 0x80|39; else adc--; } else { if(adc == 0x00) adc = 8*8-1; else adc--; } } } void msm6222b_device::shift_step(bool direction) { if(direction) { if(shift == 79) shift = 0; else shift++; } else { if(shift == 0) shift = 79; else shift--; } } bool msm6222b_device::blink_on() const { if(!cursor_blinking) return false; UINT64 clocks = machine().time().as_ticks(250000); if(double_height) return clocks % 281600 >= 140800; else return clocks % 204800 >= 102400; } const UINT8 *msm6222b_device::render() { memset(render_buf, 0, 80*16); if(!display_on) return render_buf; int char_height = double_height ? 11 : 8; for(int i=0; i<80; i++) { UINT8 c = ddram[(i+shift) % 80]; if(c < 16) memcpy(render_buf + 16*i, double_height ? cgram + 8*(c & 6) : cgram + 8*(c & 7), char_height); else if(cgrom) memcpy(render_buf + 16*i, cgrom + 16*c, char_height); } if(cursor_on) { int cpos = adc & 0x7f; if(two_line) { if((cpos >= 40 && cpos < 64) || cpos >= 64+40) cpos = -1; else if(cpos >= 64) cpos += 40-64; } else { if(cpos >= 80) cpos = -1; } if(cpos != -1) { cpos = (cpos + shift) % 80; render_buf[cpos*16 + (double_height ? 10 : 7)] |= 0x1f; if(blink_on()) for(int i=0; i