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mame/src/mess/video/mbee.c

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/***************************************************************************
microbee.c
video hardware
Juergen Buchmueller <pullmoll@t-online.de>, Dec 1999
Tests of keyboard. Start mbeeic.
1. Load ASTEROIDS PLUS, stay in attract mode, hold down spacebar,
it should only fire bullets. If it sometimes starts turning,
thrusting or using the shield, then there is a problem.
2. Load SCAVENGER and make sure it doesn't go to the next level
until you find the Exit.
3. At the Basic prompt, type in EDASM press enter. At the memory size
prompt press enter. Now, make sure the keyboard works properly.
TODO:
1. mbeeppc keyboard response is quite slow. You need to hold each
key until it responds. It works much better if you overclock the cpu.
****************************************************************************/
#include "includes/mbee.h"
/***********************************************************
The 6845 can produce a variety of cursor shapes - all
are emulated here.
Need to find out if the 6545 works the same way.
************************************************************/
void mbee_state::sy6545_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_sy6545_cursor); i++) m_sy6545_cursor[i] = 0; // prepare cursor by erasing old one
r9 = m_sy6545_reg[9]; // number of scan lines - 1
r10 = m_sy6545_reg[10] & 0x1f; // cursor start line = last 5 bits
r11 = m_sy6545_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_sy6545_cursor);i++) m_sy6545_cursor[i]=0xff; // turn on full cursor
if (curs_type == 1) for (i = r10;i < r11;i++) m_sy6545_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_sy6545_cursor[i]=0; // now take a bite out of the middle
}
/***********************************************************
Handlers of video, colour, and attribute RAM
************************************************************/
READ8_MEMBER( mbee_state::mbee_low_r )
{
if (m_0b & 1)
return m_p_gfxram[offset];
else
return m_p_videoram[offset];
}
WRITE8_MEMBER( mbee_state::mbee_low_w )
{
m_p_videoram[offset] = data;
}
READ8_MEMBER( mbee_state::mbee_high_r )
{
return m_p_gfxram[0x800 | offset];
}
WRITE8_MEMBER( mbee_state::mbee_high_w )
{
m_p_gfxram[0x800 | offset] = data;
}
READ8_MEMBER( mbee_state::mbee_0b_r )
{
return m_0b;
}
WRITE8_MEMBER( mbee_state::mbee_0b_w )
{
m_0b = data;
}
READ8_MEMBER( mbee_state::mbeeic_08_r )
{
return m_08;
}
WRITE8_MEMBER( mbee_state::mbeeic_08_w )
{
m_08 = data;
}
READ8_MEMBER( mbee_state::mbeeic_high_r )
{
if (m_08 & 0x40)
return m_p_colorram[offset];
else
return m_p_gfxram[0x800 | offset];
}
WRITE8_MEMBER( mbee_state::mbeeic_high_w )
{
if ((m_08 & 0x40) && (~m_0b & 1))
m_p_colorram[offset] = data;
else
m_p_gfxram[0x0800 | offset] = data;
}
READ8_MEMBER( mbee_state::mbeeppc_1c_r )
{
return m_1c;
}
WRITE8_MEMBER( mbee_state::mbeeppc_1c_w )
{
/* d7 extended graphics (1=allow attributes and pcg banks)
d5 bankswitch basic rom
d4 select attribute ram
d3..d0 select state->m_videoram bank */
m_1c = data;
membank("basic")->set_entry(BIT(data, 5));
}
WRITE8_MEMBER( mbee_state::mbee256_1c_w )
{
/* d7 extended graphics (1=allow attributes and pcg banks)
d5 bankswitch basic rom
d4 select attribute ram
d3..d0 select state->m_videoram bank */
m_1c = data;
}
READ8_MEMBER( mbee_state::mbeeppc_low_r )
{
if ((m_1c & 0x1f) == 0x10)
return m_p_attribram[offset];
else
if (m_0b & 1)
return m_p_gfxram[offset];
else
return m_p_videoram[offset];
}
WRITE8_MEMBER( mbee_state::mbeeppc_low_w )
{
if (m_1c & 16)
m_p_attribram[offset] = data;
else
m_p_videoram[offset] = data;
}
READ8_MEMBER( mbee_state::mbeeppc_high_r )
{
if (m_08 & 0x40)
return m_p_colorram[offset];
else
return m_p_gfxram[(((m_1c & 15) + 1) << 11) | offset];
}
WRITE8_MEMBER ( mbee_state::mbeeppc_high_w )
{
if ((m_08 & 0x40) && (~m_0b & 1))
m_p_colorram[offset] = data;
else
m_p_gfxram[(((m_1c & 15) + 1) << 11) | offset] = data;
}
/***********************************************************
CRTC-driven keyboard
************************************************************/
/* The direction keys are used by the pc85 menu. Do not know what uses the "insert" key. */
void mbee_state::keyboard_matrix_r(int offs)
{
UINT8 port = (offs >> 7) & 7;
UINT8 bit = (offs >> 4) & 7;
UINT8 data = 0;
switch ( port )
{
case 0: data = m_io_x0->read(); break;
case 1: data = m_io_x1->read(); break;
case 2: data = m_io_x2->read(); break;
case 3: data = m_io_x3->read(); break;
case 4: data = m_io_x4->read(); break;
case 5: data = m_io_x5->read(); break;
case 6: data = m_io_x6->read(); break;
case 7: data = m_io_x7->read(); break;
}
data = ( data >> bit ) & 1;
if ((data | m_is_premium) == 0)
{
UINT8 extra = m_io_extra->read();
if( extra & 0x01 ) /* extra: cursor up */
{
if( port == 7 && bit == 1 ) data = 1; /* Control */
if( port == 0 && bit == 5 ) data = 1; /* E */
}
else
if( extra & 0x02 ) /* extra: cursor down */
{
if( port == 7 && bit == 1 ) data = 1; /* Control */
if( port == 3 && bit == 0 ) data = 1; /* X */
}
else
if( extra & 0x04 ) /* extra: cursor left */
{
if( port == 7 && bit == 1 ) data = 1; /* Control */
if( port == 2 && bit == 3 ) data = 1; /* S */
}
else
if( extra & 0x08 ) /* extra: cursor right */
{
if( port == 7 && bit == 1 ) data = 1; /* Control */
if( port == 0 && bit == 4 ) data = 1; /* D */
}
#if 0
// this key doesn't appear on any keyboard afaik
else
if( extra & 0x10 ) /* extra: insert */
{
if( port == 7 && bit == 1 ) data = 1; /* Control */
if( port == 2 && bit == 6 ) data = 1; /* V */
}
#endif
}
if( data )
{
m_sy6545_reg[17] = offs;
m_sy6545_reg[16] = (offs >> 8) & 0x3f;
m_sy6545_status |= 0x40; //lpen_strobe
}
}
void mbee_state::mbee_video_kbd_scan( int param )
{
if (m_0b) return;
keyboard_matrix_r(param);
}
/***********************************************************
CRTC registers
************************************************************/
READ8_MEMBER( mbee_state::m6545_status_r )
{
const rectangle &visarea = m_screen->visible_area();
UINT8 data = m_sy6545_status; // bit 6 = lpen strobe, bit 7 = update strobe
int y = m_screen->vpos();
if( y < visarea.min_y || y > visarea.max_y )
data |= 0x20; /* vertical blanking */
return data;
}
READ8_MEMBER( mbee_state::m6545_data_r )
{
UINT16 addr;
UINT8 data = m_crtc->register_r( space, 0 );
switch( m_sy6545_ind )
{
case 16:
case 17:
m_sy6545_status &= 0x80; // turn off lpen_strobe
break;
case 31:
/* This firstly pushes the contents of the transparent registers onto the MA lines,
then increments the address, then sets update strobe on. */
addr = (m_sy6545_reg[18] << 8) | m_sy6545_reg[19];
keyboard_matrix_r(addr);
m_sy6545_reg[19]++;
if (!m_sy6545_reg[19]) m_sy6545_reg[18]++;
m_sy6545_status |= 0x80; // update_strobe
break;
}
return data;
}
WRITE8_MEMBER ( mbee_state::m6545_index_w )
{
data &= 0x1f;
m_sy6545_ind = data;
m_crtc->address_w( space, 0, data );
}
WRITE8_MEMBER ( mbee_state::m6545_data_w )
{
static const UINT8 sy6545_mask[32]={0xff,0xff,0xff,0x0f,0x7f,0x1f,0x7f,0x7f,3,0x1f,0x7f,0x1f,0x3f,0xff,0x3f,0xff,0,0,0x3f,0xff};
int addr = 0;
switch( m_sy6545_ind )
{
case 12:
data &= 0x3f; // select alternate character set
if( m_sy6545_reg[12] != data )
memcpy(m_p_gfxram, memregion("gfx")->base() + (((data & 0x30) == 0x20) << 11), 0x800);
break;
case 31:
/* This firstly pushes the contents of the transparent registers onto the MA lines,
then increments the address, then sets update strobe on. */
addr = (m_sy6545_reg[18] << 8) | m_sy6545_reg[19];
keyboard_matrix_r(addr);
m_sy6545_reg[19]++;
if (!m_sy6545_reg[19]) m_sy6545_reg[18]++;
m_sy6545_status |= 0x80; // update_strobe
break;
}
m_sy6545_reg[m_sy6545_ind] = data & sy6545_mask[m_sy6545_ind]; /* save data in register */
m_crtc->register_w( space, 0, data );
if ((m_sy6545_ind > 8) && (m_sy6545_ind < 12)) sy6545_cursor_configure(); /* adjust cursor shape - remove when mame fixed */
}
/***********************************************************
Video
************************************************************/
VIDEO_START_MEMBER(mbee_state,mbee)
{
m_p_videoram = memregion("videoram")->base();
m_p_gfxram = memregion("gfx")->base()+0x1000;
m_is_premium = 0;
}
VIDEO_START_MEMBER(mbee_state,mbeeic)
{
m_p_videoram = memregion("videoram")->base();
m_p_colorram = memregion("colorram")->base();
m_p_gfxram = memregion("gfx")->base()+0x1000;
m_is_premium = 0;
}
VIDEO_START_MEMBER(mbee_state,mbeeppc)
{
m_p_videoram = memregion("videoram")->base();
m_p_colorram = memregion("colorram")->base();
m_p_gfxram = memregion("gfx")->base()+0x1000;
m_p_attribram = memregion("attrib")->base();
m_is_premium = 1;
}
UINT32 mbee_state::screen_update_mbee(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
m_framecnt++;
m_speed = m_sy6545_reg[10]&0x20, m_flash = m_sy6545_reg[10]&0x40; // cursor modes
m_cursor = (m_sy6545_reg[14]<<8) | m_sy6545_reg[15]; // get cursor position
m_crtc->screen_update(screen, bitmap, cliprect);
return 0;
}
MC6845_ON_UPDATE_ADDR_CHANGED( mbee_update_addr )
{
/* not sure what goes in here - parameters passed are device, address, strobe */
}
MC6845_ON_UPDATE_ADDR_CHANGED( mbee256_update_addr )
{
/* not used on 256TC */
}
/* monochrome bee */
MC6845_UPDATE_ROW( mbee_update_row )
{
mbee_state *state = device->machine().driver_data<mbee_state>();
const rgb_t *palette = state->m_palette->palette()->entry_list_raw();
UINT8 chr,gfx;
UINT16 mem,x;
UINT32 *p = &bitmap.pix32(y);
for (x = 0; x < x_count; x++) // for each character
{
UINT8 inv=0;
mem = (ma + x) & 0x7ff;
chr = state->m_p_videoram[mem];
state->mbee_video_kbd_scan(x+ma);
/* process cursor */
if ((((!state->m_flash) && (!state->m_speed)) || // (5,6)=(0,0) = cursor on always
((state->m_flash) && (state->m_speed) && (state->m_framecnt & 0x10)) || // (5,6)=(1,1) = cycle per 32 frames
((state->m_flash) && (!state->m_speed) && (state->m_framecnt & 8))) && // (5,6)=(0,1) = cycle per 16 frames
(mem == state->m_cursor)) // displaying at cursor position?
inv ^= state->m_sy6545_cursor[ra]; // cursor scan row
/* get pattern of pixels for that character scanline */
gfx = state->m_p_gfxram[(chr<<4) | ra] ^ inv;
/* Display a scanline of a character (8 pixels) */
*p++ = palette[BIT(gfx, 7)];
*p++ = palette[BIT(gfx, 6)];
*p++ = palette[BIT(gfx, 5)];
*p++ = palette[BIT(gfx, 4)];
*p++ = palette[BIT(gfx, 3)];
*p++ = palette[BIT(gfx, 2)];
*p++ = palette[BIT(gfx, 1)];
*p++ = palette[BIT(gfx, 0)];
}
}
/* prom-based colours */
MC6845_UPDATE_ROW( mbeeic_update_row )
{
mbee_state *state = device->machine().driver_data<mbee_state>();
const rgb_t *palette = state->m_palette->palette()->entry_list_raw();
UINT8 chr,gfx,fg,bg;
UINT16 mem,x,col;
UINT16 colourm = (state->m_08 & 0x0e) << 7;
UINT32 *p = &bitmap.pix32(y);
for (x = 0; x < x_count; x++) // for each character
{
UINT8 inv=0;
mem = (ma + x) & 0x7ff;
chr = state->m_p_videoram[mem];
col = state->m_p_colorram[mem] | colourm; // read a byte of colour
state->mbee_video_kbd_scan(x+ma);
/* process cursor */
if ((((!state->m_flash) && (!state->m_speed)) || // (5,6)=(0,0) = cursor on always
((state->m_flash) && (state->m_speed) && (state->m_framecnt & 0x10)) || // (5,6)=(1,1) = cycle per 32 frames
((state->m_flash) && (!state->m_speed) && (state->m_framecnt & 8))) && // (5,6)=(0,1) = cycle per 16 frames
(mem == state->m_cursor)) // displaying at cursor position?
inv ^= state->m_sy6545_cursor[ra]; // cursor scan row
/* get pattern of pixels for that character scanline */
gfx = state->m_p_gfxram[(chr<<4) | ra] ^ inv;
fg = (col & 0x001f) | 64; // map to foreground palette
bg = (col & 0x07e0) >> 5; // and background palette
/* Display a scanline of a character (8 pixels) */
*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];
*p++ = palette[BIT(gfx, 0) ? fg : bg];
}
}
/* new colours & hires2 */
MC6845_UPDATE_ROW( mbeeppc_update_row )
{
mbee_state *state = device->machine().driver_data<mbee_state>();
const rgb_t *palette = state->m_palette->palette()->entry_list_raw();
UINT8 gfx,fg,bg;
UINT16 mem,x,col,chr;
UINT32 *p = &bitmap.pix32(y);
for (x = 0; x < x_count; x++) // for each character
{
UINT8 inv=0;
mem = (ma + x) & 0x7ff;
chr = state->m_p_videoram[mem];
col = state->m_p_colorram[mem]; // read a byte of colour
if (state->m_1c & 0x80) // are extended features enabled?
{
UINT8 attr = state->m_p_attribram[mem];
if (chr & 0x80)
chr += ((attr & 15) << 7); // bump chr to its particular pcg definition
if (attr & 0x40)
inv ^= 0xff; // inverse attribute
if ((attr & 0x80) && (state->m_framecnt & 0x10)) // flashing attribute
chr = 0x20;
}
state->mbee_video_kbd_scan(x+ma);
/* process cursor */
if ((((!state->m_flash) && (!state->m_speed)) || // (5,6)=(0,0) = cursor on always
((state->m_flash) && (state->m_speed) && (state->m_framecnt & 0x10)) || // (5,6)=(1,1) = cycle per 32 frames
((state->m_flash) && (!state->m_speed) && (state->m_framecnt & 8))) && // (5,6)=(0,1) = cycle per 16 frames
(mem == state->m_cursor)) // displaying at cursor position?
inv ^= state->m_sy6545_cursor[ra]; // cursor scan row
/* get pattern of pixels for that character scanline */
gfx = state->m_p_gfxram[(chr<<4) | ra] ^ inv;
fg = col & 15; // map to foreground palette
bg = (col & 0xf0) >> 4; // and background palette
/* Display a scanline of a character (8 pixels) */
*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];
*p++ = palette[BIT(gfx, 0) ? fg : bg];
}
}
/***********************************************************
Palette
************************************************************/
PALETTE_INIT_MEMBER(mbee_state,mbeeic)
{
const UINT8 *color_prom = memregion("proms")->base();
UINT16 i;
UINT8 r, b, g, k;
UINT8 level[] = { 0, 0x80, 0xff, 0xff }; /* off, half, full intensity */
/* set up background palette (00-63) */
for (i = 0; i < 64; i++)
{
r = level[((i>>0)&1)|((i>>2)&2)];
g = level[((i>>1)&1)|((i>>3)&2)];
b = level[((i>>2)&1)|((i>>4)&2)];
palette.set_pen_color(i, rgb_t(r, g, b));
}
/* set up foreground palette (64-95) by reading the prom */
for (i = 0; i < 32; i++)
{
k = color_prom[i];
r = level[((k>>2)&1)|((k>>4)&2)];
g = level[((k>>1)&1)|((k>>3)&2)];
b = level[((k>>0)&1)|((k>>2)&2)];
palette.set_pen_color(i|64, rgb_t(r, g, b));
}
}
PALETTE_INIT_MEMBER(mbee_state,mbeepc85b)
{
const UINT8 *color_prom = memregion("proms")->base();
UINT16 i;
UINT8 r, b, g, k;
UINT8 level[] = { 0, 0x80, 0x80, 0xff }; /* off, half, full intensity */
/* set up background palette (00-63) */
for (i = 0; i < 64; i++)
{
r = level[((i>>0)&1)|((i>>2)&2)];
g = level[((i>>1)&1)|((i>>3)&2)];
b = level[((i>>2)&1)|((i>>4)&2)];
palette.set_pen_color(i, rgb_t(r, g, b));
}
level[2] = 0xff;
/* set up foreground palette (64-95) by reading the prom */
for (i = 0; i < 32; i++)
{
k = color_prom[i];
r = level[((k>>2)&1)|((k>>4)&2)];
g = level[((k>>1)&1)|((k>>3)&2)];
b = level[((k>>0)&1)|((k>>2)&2)];
palette.set_pen_color(i|64, rgb_t(r, g, b));
}
}
PALETTE_INIT_MEMBER(mbee_state,mbeeppc)
{
UINT16 i;
UINT8 r, b, g;
/* set up 8 low intensity colours */
for (i = 0; i < 8; i++)
{
r = (i & 1) ? 0xc0 : 0;
g = (i & 2) ? 0xc0 : 0;
b = (i & 4) ? 0xc0 : 0;
palette.set_pen_color(i, rgb_t(r, g, b));
}
/* set up 8 high intensity colours */
for (i = 9; i < 16; i++)
{
r = (i & 1) ? 0xff : 0;
g = (i & 2) ? 0xff : 0;
b = (i & 4) ? 0xff : 0;
palette.set_pen_color(i, rgb_t(r, g, b));
}
}
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