// license:BSD-3-Clause
// copyright-holders:Robbbert
/* Super80.c written by Robbbert, 2005-2010. See the driver source for documentation. */
/* Notes on using MAME MC6845 Device (MMD).
1. Speed of MMD is about 20% slower than pre-MMD coding
2. Undocumented cursor start and end-lines is not supported by MMD, so we do it here. */
#include "includes/super80.h"
/**************************** PALETTES for super80m and super80v ******************************************/
PALETTE_INIT_MEMBER( super80_state, super80m )
{
// RGB
//palette_set_colors_rgb(super80_rgb_palette);
m_palette->set_pen_color(0, rgb_t(0x00, 0x00, 0x00)); /* 0 Black */
m_palette->set_pen_color(1, rgb_t(0x00, 0x00, 0x00)); /* 1 Black */
m_palette->set_pen_color(2, rgb_t(0x00, 0x00, 0x7f)); /* 2 Blue */
m_palette->set_pen_color(3, rgb_t(0x00, 0x00, 0xff)); /* 3 Light Blue */
m_palette->set_pen_color(4, rgb_t(0x00, 0x7f, 0x00)); /* 4 Green */
m_palette->set_pen_color(5, rgb_t(0x00, 0xff, 0x00)); /* 5 Bright Green */
m_palette->set_pen_color(6, rgb_t(0x00, 0x7f, 0x7f)); /* 6 Cyan */
m_palette->set_pen_color(7, rgb_t(0x00, 0xff, 0xff)); /* 7 Turquoise */
m_palette->set_pen_color(8, rgb_t(0x7f, 0x00, 0x00)); /* 8 Dark Red */
m_palette->set_pen_color(9, rgb_t(0xff, 0x00, 0x00)); /* 9 Red */
m_palette->set_pen_color(10, rgb_t(0x7f, 0x00, 0x7f)); /* 10 Purple */
m_palette->set_pen_color(11, rgb_t(0xff, 0x00, 0xff)); /* 11 Magenta */
m_palette->set_pen_color(12, rgb_t(0x7f, 0x7f, 0x00)); /* 12 Lime */
m_palette->set_pen_color(13, rgb_t(0xff, 0xff, 0x00)); /* 13 Yellow */
m_palette->set_pen_color(14, rgb_t(0xbf, 0xbf, 0xbf)); /* 14 Off White */
m_palette->set_pen_color(15, rgb_t(0xff, 0xff, 0xff)); /* 15 White */
// Composite
m_palette->set_pen_color(16, rgb_t(0x00, 0x00, 0x00)); /* 0 Black */
m_palette->set_pen_color(17, rgb_t(0x80, 0x80, 0x80)); /* 1 Grey */
m_palette->set_pen_color(18, rgb_t(0x00, 0x00, 0xff)); /* 2 Blue */
m_palette->set_pen_color(19, rgb_t(0xff, 0xff, 0x80)); /* 3 Light Yellow */
m_palette->set_pen_color(20, rgb_t(0x00, 0xff, 0x00)); /* 4 Green */
m_palette->set_pen_color(21, rgb_t(0xff, 0x80, 0xff)); /* 5 Light Magenta */
m_palette->set_pen_color(22, rgb_t(0x00, 0xff, 0xff)); /* 6 Cyan */
m_palette->set_pen_color(23, rgb_t(0xff, 0x40, 0x40)); /* 7 Light Red */
m_palette->set_pen_color(24, rgb_t(0xff, 0x00, 0x00)); /* 8 Red */
m_palette->set_pen_color(25, rgb_t(0x00, 0x80, 0x80)); /* 9 Dark Cyan */
m_palette->set_pen_color(26, rgb_t(0xff, 0x00, 0xff)); /* 10 Magenta */
m_palette->set_pen_color(27, rgb_t(0x80, 0xff, 0x80)); /* 11 Light Green */
m_palette->set_pen_color(28, rgb_t(0xff, 0xff, 0x00)); /* 12 Yellow */
m_palette->set_pen_color(29, rgb_t(0x00, 0x00, 0x80)); /* 13 Dark Blue */
m_palette->set_pen_color(30, rgb_t(0xff, 0xff, 0xff)); /* 14 White */
m_palette->set_pen_color(31, rgb_t(0x00, 0x00, 0x00)); /* 15 Black */
}
void super80_state::screen_eof_super80m(screen_device &screen, bool state)
{
// rising edge
if (state)
{
/* if we chose another palette or colour mode, enable it */
m_palette_index = (m_io_config->read() & 0x60) ? 0 : 16;
}
}
UINT32 super80_state::screen_update_super80(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
UINT8 y,ra,chr=32,gfx,screen_on=0;
UINT16 sy=0,ma=m_vidpg,x;
output_set_value("cass_led",BIT(m_portf0, 5));
if ((BIT(m_portf0, 2)) | (!BIT(m_io_config->read(), 2))) /* bit 2 of port F0 is high, OR user turned on config switch */
screen_on++;
for (y = 0; y < 16; y++)
{
for (ra = 0; ra < 10; ra++)
{
UINT16 *p = &bitmap.pix16(sy++);
for (x = 0; x < 32; x++) // done this way to avoid x overflowing on page FF
{
if (screen_on)
chr = m_p_ram[ma | x] & 0x3f;
/* get pattern of pixels for that character scanline */
gfx = m_p_chargen[(chr<<4) | ((ra & 8) >> 3) | ((ra & 7) << 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);
}
}
ma+=32;
}
return 0;
}
UINT32 super80_state::screen_update_super80d(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
UINT8 y,ra,chr=32,gfx,screen_on=0;
UINT16 sy=0,ma=m_vidpg,x;
output_set_value("cass_led",BIT(m_portf0, 5));
if ((BIT(m_portf0, 2)) | (!BIT(m_io_config->read(), 2))) /* bit 2 of port F0 is high, OR user turned on config switch */
screen_on++;
for (y = 0; y < 16; y++)
{
for (ra = 0; ra < 10; ra++)
{
UINT16 *p = &bitmap.pix16(sy++);
for (x = 0; x < 32; x++)
{
if (screen_on)
chr = m_p_ram[ma | x];
/* get pattern of pixels for that character scanline */
gfx = m_p_chargen[((chr & 0x7f)<<4) | ((ra & 8) >> 3) | ((ra & 7) << 1)] ^ ((chr & 0x80) ? 0xff : 0);
/* 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);
}
}
ma+=32;
}
return 0;
}
UINT32 super80_state::screen_update_super80e(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
UINT8 y,ra,chr=32,gfx,screen_on=0;
UINT16 sy=0,ma=m_vidpg,x;
output_set_value("cass_led",BIT(m_portf0, 5));
if ((BIT(m_portf0, 2)) | (!BIT(m_io_config->read(), 2))) /* bit 2 of port F0 is high, OR user turned on config switch */
screen_on++;
for (y = 0; y < 16; y++)
{
for (ra = 0; ra < 10; ra++)
{
UINT16 *p = &bitmap.pix16(sy++);
for (x = 0; x < 32; x++)
{
if (screen_on)
chr = m_p_ram[ma | x];
/* get pattern of pixels for that character scanline */
gfx = m_p_chargen[(chr<<4) | ((ra & 8) >> 3) | ((ra & 7) << 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);
}
}
ma+=32;
}
return 0;
}
UINT32 super80_state::screen_update_super80m(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
UINT8 y,ra,chr=32,gfx,screen_on=0;
UINT16 sy=0,ma=m_vidpg,x;
UINT8 col, bg=0, fg=0, options=m_io_config->read();
/* get selected character generator */
UINT8 cgen = m_current_charset ^ ((options & 0x10)>>4); /* bit 0 of port F1 and cgen config switch */
output_set_value("cass_led",BIT(m_portf0, 5));
if ((BIT(m_portf0, 2)) | (!BIT(options, 2))) /* bit 2 of port F0 is high, OR user turned on config switch */
screen_on++;
if (screen_on)
{
if ((options & 0x60) == 0x60)
fg = 15; /* b&w */
else
fg = 5; /* green */
}
for (y = 0; y < 16; y++)
{
for (ra = 0; ra < 10; ra++)
{
UINT16 *p = &bitmap.pix16(sy++);
for (x = 0; x < 32; x++)
{
if (screen_on)
chr = m_p_ram[ma | x];
if (!(options & 0x40))
{
col = m_p_ram[0xfe00 | ma | x]; /* byte of colour to display */
fg = m_palette_index + (col & 0x0f);
bg = m_palette_index + (col >> 4);
}
/* get pattern of pixels for that character scanline */
if (cgen)
gfx = m_p_chargen[(chr<<4) | ((ra & 8) >> 3) | ((ra & 7) << 1)];
else
gfx = m_p_chargen[0x1000 | ((chr & 0x7f)<<4) | ((ra & 8) >> 3) | ((ra & 7) << 1)] ^ ((chr & 0x80) ? 0xff : 0);
/* Display a scanline of a character */
*p++ = BIT(gfx, 7) ? fg : bg;
*p++ = BIT(gfx, 6) ? fg : bg;
*p++ = BIT(gfx, 5) ? fg : bg;
*p++ = BIT(gfx, 4) ? fg : bg;
*p++ = BIT(gfx, 3) ? fg : bg;
*p++ = BIT(gfx, 2) ? fg : bg;
*p++ = BIT(gfx, 1) ? fg : bg;
*p++ = BIT(gfx, 0) ? fg : bg;
}
}
ma+=32;
}
return 0;
}
VIDEO_START_MEMBER(super80_state,super80)
{
m_vidpg = 0xfe00;
m_p_chargen = memregion("chargen")->base();
m_p_ram = memregion("maincpu")->base();
}
/**************************** I/O PORTS *****************************************************************/
WRITE8_MEMBER( super80_state::super80_f1_w )
{
m_vidpg = (data & 0xfe) << 8;
m_current_charset = data & 1;
}
/*---------------------------------------------------------------
Super-80R and Super-80V
---------------------------------------------------------------*/
static const UINT8 mc6845_mask[32]={0xff,0xff,0xff,0x0f,0x7f,0x1f,0x7f,0x7f,3,0x1f,0x7f,0x1f,0x3f,0xff,0x3f,0xff,0,0};
READ8_MEMBER( super80_state::super80v_low_r )
{
if BIT(m_portf0, 2)
return m_p_videoram[offset];
else
return m_p_colorram[offset];
}
WRITE8_MEMBER( super80_state::super80v_low_w )
{
if BIT(m_portf0, 2)
m_p_videoram[offset] = data;
else
m_p_colorram[offset] = data;
}
READ8_MEMBER( super80_state::super80v_high_r )
{
if (!BIT(m_portf0, 2))
return m_p_colorram[0x800 | offset];
else
if BIT(m_portf0, 4)
return m_p_pcgram[0x800 | offset];
else
return m_p_pcgram[offset];
}
WRITE8_MEMBER( super80_state::super80v_high_w )
{
if (!BIT(m_portf0, 2))
m_p_colorram[0x800 | offset] = data;
else
{
m_p_videoram[0x800 | offset] = data;
if BIT(m_portf0, 4)
m_p_pcgram[0x800 | offset] = data;
}
}
/* The 6845 can produce a variety of cursor shapes - all are emulated here - remove when mame fixed */
void super80_state::mc6845_cursor_configure()
{
UINT8 i,curs_type=0,r9,r10,r11;
/* curs_type holds the general cursor shape to be created
0 = no cursor
1 = partial cursor (only shows on a block of scan lines)
2 = full cursor
3 = two-part cursor (has a part at the top and bottom with the middle blank) */
for ( i = 0; i < ARRAY_LENGTH(m_mc6845_cursor); i++) m_mc6845_cursor[i] = 0; // prepare cursor by erasing old one
r9 = m_mc6845_reg[9]; // number of scan lines - 1
r10 = m_mc6845_reg[10] & 0x1f; // cursor start line = last 5 bits
r11 = m_mc6845_reg[11]+1; // cursor end line incremented to suit for-loops below
/* decide the curs_type by examining the registers */
if (r10 < r11) curs_type=1; // start less than end, show start to end
else
if (r10 == r11) curs_type=2; // if equal, show full cursor
else curs_type=3; // if start greater than end, it's a two-part cursor
if ((r11 - 1) > r9) curs_type=2; // if end greater than scan-lines, show full cursor
if (r10 > r9) curs_type=0; // if start greater than scan-lines, then no cursor
if (r11 > 16) r11=16; // truncate 5-bit register to fit our 4-bit hardware
/* create the new cursor */
if (curs_type > 1) for (i = 0;i < ARRAY_LENGTH(m_mc6845_cursor);i++) m_mc6845_cursor[i]=0xff; // turn on full cursor
if (curs_type == 1) for (i = r10;i < r11;i++) m_mc6845_cursor[i]=0xff; // for each line that should show, turn on that scan line
if (curs_type == 3) for (i = r11; i < r10;i++) m_mc6845_cursor[i]=0; // now take a bite out of the middle
}
VIDEO_START_MEMBER(super80_state,super80v)
{
m_p_pcgram = memregion("maincpu")->base()+0xf000;
m_p_videoram = memregion("videoram")->base();
m_p_colorram = memregion("colorram")->base();
}
UINT32 super80_state::screen_update_super80v(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
m_s_options=m_io_config->read();
output_set_value("cass_led",BIT(m_portf0, 5));
m_crtc->screen_update(screen, bitmap, cliprect);
return 0;
}
MC6845_UPDATE_ROW( super80_state::crtc_update_row )
{
const rgb_t *palette = m_palette->palette()->entry_list_raw();
UINT8 chr,col,gfx,fg,bg=0;
UINT16 mem,x;
UINT32 *p = &bitmap.pix32(y);
for (x = 0; x < x_count; x++) // for each character
{
UINT8 inv=0;
// if (x == cursor_x) inv=0xff; /* uncomment when mame fixed */
mem = (ma + x) & 0xfff;
chr = m_p_videoram[mem];
/* get colour or b&w */
fg = 5; /* green */
if ((m_s_options & 0x60) == 0x60) fg = 15; /* b&w */
if (~m_s_options & 0x40)
{
col = m_p_colorram[mem]; /* byte of colour to display */
fg = m_palette_index + (col & 0x0f);
bg = m_palette_index + (col >> 4);
}
/* if inverse mode, replace any pcgram chrs with inverse chrs */
if ((!BIT(m_portf0, 4)) && (chr & 0x80)) // is it a high chr in inverse mode
{
inv ^= 0xff; // invert the chr
chr &= 0x7f; // and drop bit 7
}
/* process cursor */
if (x == cursor_x)
inv ^= m_mc6845_cursor[ra];
/* get pattern of pixels for that character scanline */
gfx = m_p_pcgram[(chr<<4) | ra] ^ inv;
/* Display a scanline of a character */
*p++ = palette[BIT(gfx, 7) ? fg : bg];
*p++ = palette[BIT(gfx, 6) ? fg : bg];
*p++ = palette[BIT(gfx, 5) ? fg : bg];
*p++ = palette[BIT(gfx, 4) ? fg : bg];
*p++ = palette[BIT(gfx, 3) ? fg : bg];
*p++ = palette[BIT(gfx, 2) ? fg : bg];
*p++ = palette[BIT(gfx, 1) ? fg : bg];
}
}
/**************************** I/O PORTS *****************************************************************/
WRITE8_MEMBER( super80_state::super80v_10_w )
{
data &= 0x1f;
m_mc6845_ind = data;
m_crtc->address_w( space, 0, data );
}
WRITE8_MEMBER( super80_state::super80v_11_w )
{
m_mc6845_reg[m_mc6845_ind] = data & mc6845_mask[m_mc6845_ind]; /* save data in register */
m_crtc->register_w( space, 0, data );
if ((m_mc6845_ind > 8) && (m_mc6845_ind < 12)) mc6845_cursor_configure(); /* adjust cursor shape - remove when mame fixed */
}