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|
// license:BSD-3-Clause
// copyright-holders:Barry Rodewald
/*
*
* Fujitsu Micro 7 Video functions
*
*/
#include "emu.h"
#include "includes/fm7.h"
#include "cpu/m6809/m6809.h"
#include "screen.h"
/*
* Main CPU: Sub-CPU interface (port 0xfd05)
*
* Read:
* bit 7: Sub-CPU busy (or halted)
* bit 0: EXTDET (?)
* Write:
* bit 7: Sub-CPU halt
* bit 6: Sub-CPU cancel IRQ
*/
uint8_t fm7_state::subintf_r()
{
uint8_t ret = 0x00;
if(m_video.sub_busy != 0 || m_video.sub_halt != 0)
ret |= 0x80;
ret |= 0x7e;
//ret |= 0x01; // EXTDET (not implemented yet)
return ret;
}
void fm7_state::subintf_w(uint8_t data)
{
m_video.sub_halt = data & 0x80;
if(data & 0x80)
m_video.sub_busy = data & 0x80;
m_sub->set_input_line(INPUT_LINE_HALT,(data & 0x80) ? ASSERT_LINE : CLEAR_LINE);
if(data & 0x40)
m_sub->set_input_line(M6809_IRQ_LINE,ASSERT_LINE);
//popmessage("Sub CPU Interface write: %02x\n",data);
}
uint8_t fm7_state::sub_busyflag_r()
{
if(m_video.sub_halt == 0)
m_video.sub_busy = 0x00;
return 0x00;
}
void fm7_state::sub_busyflag_w(uint8_t data)
{
m_video.sub_busy = 0x80;
}
/*
* Sub-CPU port 0xd402
* Read-only: Acknowledge Cancel IRQ
*/
uint8_t fm7_state::cancel_ack()
{
m_sub->set_input_line(M6809_IRQ_LINE,CLEAR_LINE);
return 0x00;
}
/*
* Reading from 0xd404 (sub-CPU) causes an "Attention" FIRQ on the main CPU
*/
uint8_t fm7_state::attn_irq_r()
{
m_video.attn_irq = 1;
m_maincpu->set_input_line(M6809_FIRQ_LINE,ASSERT_LINE);
return 0xff;
}
/*
* Sub CPU: I/O port 0xd409
*
* On read, enables VRAM access
* On write, disables VRAM access
*/
uint8_t fm7_state::vram_access_r()
{
m_video.vram_access = 1;
return 0xff;
}
void fm7_state::vram_access_w(uint8_t data)
{
m_video.vram_access = 0;
}
TIMER_CALLBACK_MEMBER(fm77_state::av_alu_task_end)
{
m_alu.busy = 0;
}
void fm77_state::alu_mask_write(uint32_t offset, int bank, uint8_t dat)
{
uint8_t temp;
int page = 0;
if(offset >= 0xc000)
page = 1;
if((m_alu.command & 0x40) == 0)
{ // "always" write mode
m_video_ram[(offset & 0x3fff) + (bank * 0x4000) + (page * 0xc000)] = dat;
return;
}
temp = m_video_ram[(offset & 0x3fff) + (bank * 0x4000) + (page * 0xc000)];
if(m_alu.command & 0x20)
{ // "not equal" write mode
temp &= m_alu.compare_data;
dat &= ~m_alu.compare_data;
}
else
{ // "equal" write mode
temp &= ~m_alu.compare_data;
dat &= m_alu.compare_data;
}
m_video_ram[(offset & 0x3fff) + (bank * 0x4000) + (page * 0xc000)] = temp | dat;
}
void fm77_state::alu_function_compare(uint32_t offset)
{
// COMPARE - compares which colors match those in the compare registers
// can be used on its own, or when bit 6 of the command register is high.
uint8_t red,green,blue;
uint8_t dat = 0;
uint8_t colour;
uint8_t banks;
int x,y;
int match;
int page = 0;
uint8_t bit = 0x80;
if(offset >= 0xc000)
{
page = 1;
offset += m_video.vram_offset2;
}
else
offset += m_video.vram_offset;
blue = m_video_ram[(offset & 0x3fff) + (page * 0xc000)];
red = m_video_ram[(offset & 0x3fff) + 0x4000 + (page * 0xc000)];
green = m_video_ram[(offset & 0x3fff) + 0x8000 + (page * 0xc000)];
banks = (~m_alu.bank_disable) & 0x07;
for(x=0;x<8;x++) // loop through each pixel
{
colour = 0;
if(blue & bit)
colour |= 1;
if(red & bit)
colour |= 2;
if(green & bit)
colour |= 4;
match = 0;
for(y=0;y<8;y++) // loop through each compare register
{
if(!(m_alu.compare[y] & 0x80)) // don't compare if register is masked
{
if((m_alu.compare[y] & banks) == (colour & banks))
match = 1;
}
}
if(match != 0)
dat |= bit;
bit >>= 1;
}
m_alu.compare_data = dat;
}
void fm77_state::alu_function_pset(uint32_t offset)
{
// PSET - simply sets the pixels to the selected logical colour
int x;
uint8_t dat;
int page = 0;
uint8_t mask;
if(m_alu.command & 0x40)
alu_function_compare(offset);
if(offset >= 0xc000)
{
page = 1;
offset += m_video.vram_offset2;
}
else
offset += m_video.vram_offset;
for(x=0;x<3;x++) // cycle through banks
{
if(!(m_alu.bank_disable & (1 << x)))
{
if(m_alu.lcolour & (1 << x))
dat = 0xff;
else
dat = 0;
mask = (m_video_ram[(offset & 0x3fff) + (x * 0x4000) + (page * 0xc000)]) & m_alu.mask;
dat &= ~m_alu.mask;
dat |= mask;
alu_mask_write(offset,x,dat);
}
}
}
void fm77_state::alu_function_or(uint32_t offset)
{
int x;
uint8_t dat;
int page = 0;
uint8_t mask;
if(m_alu.command & 0x40)
alu_function_compare(offset);
if(offset >= 0xc000)
{
page = 1;
offset += m_video.vram_offset2;
}
else
offset += m_video.vram_offset;
for(x=0;x<3;x++) // cycle through banks
{
if(!(m_alu.bank_disable & (1 << x)))
{
if(m_alu.lcolour & (1 << x))
dat = 0xff;
else
dat = 0;
mask = (m_video_ram[(offset & 0x3fff) + (x * 0x4000) + (page * 0xc000)]);
dat |= mask;
mask &= m_alu.mask;
dat &= ~m_alu.mask;
dat |= mask;
alu_mask_write(offset,x,dat);
}
}
}
void fm77_state::alu_function_and(uint32_t offset)
{
int x;
uint8_t dat;
int page = 0;
uint8_t mask;
if(m_alu.command & 0x40)
alu_function_compare(offset);
if(offset >= 0xc000)
{
page = 1;
offset += m_video.vram_offset2;
}
else
offset += m_video.vram_offset;
for(x=0;x<3;x++) // cycle through banks
{
if(!(m_alu.bank_disable & (1 << x)))
{
if(m_alu.lcolour & (1 << x))
dat = 0xff;
else
dat = 0;
mask = (m_video_ram[(offset & 0x3fff) + (x * 0x4000) + (page * 0xc000)]);
dat &= mask;
mask &= m_alu.mask;
dat &= ~m_alu.mask;
dat |= mask;
alu_mask_write(offset,x,dat);
}
}
}
void fm77_state::alu_function_xor(uint32_t offset)
{
int x;
uint8_t dat;
int page = 0;
uint8_t mask;
if(m_alu.command & 0x40)
alu_function_compare(offset);
if(offset >= 0xc000)
{
page = 1;
offset += m_video.vram_offset2;
}
else
offset += m_video.vram_offset;
for(x=0;x<3;x++) // cycle through banks
{
if(!(m_alu.bank_disable & (1 << x)))
{
if(m_alu.lcolour & (1 << x))
dat = 0xff;
else
dat = 0;
mask = (m_video_ram[(offset & 0x3fff) + (x * 0x4000) + (page * 0xc000)]);
dat ^= mask;
mask &= m_alu.mask;
dat &= ~m_alu.mask;
dat |= mask;
alu_mask_write(offset,x,dat);
}
}
}
void fm77_state::alu_function_not(uint32_t offset)
{
int x;
uint8_t dat;
int page = 0;
uint8_t mask;
if(m_alu.command & 0x40)
alu_function_compare(offset);
if(offset >= 0xc000)
{
page = 1;
offset += m_video.vram_offset2;
}
else
offset += m_video.vram_offset;
for(x=0;x<3;x++) // cycle through banks
{
if(!(m_alu.bank_disable & (1 << x)))
{
#ifdef UNUSED
// "dat" is overwritten before it can get used: Coverity 315775
if(m_alu.lcolour & (1 << x))
dat = 0xff;
else
dat = 0;
#endif
mask = (m_video_ram[(offset & 0x3fff) + (x * 0x4000) + (page * 0xc000)]);
dat = ~mask;
mask &= m_alu.mask;
dat &= ~m_alu.mask;
dat |= mask;
alu_mask_write(offset,x,dat);
}
}
}
void fm77_state::alu_function_invalid(uint32_t offset)
{
// Invalid function, still does something though (used by Laydock)
int x;
uint8_t dat;
int page = 0;
uint8_t mask;
if(m_alu.command & 0x40)
alu_function_compare(offset);
if(offset >= 0xc000)
{
page = 1;
offset += m_video.vram_offset2;
}
else
offset += m_video.vram_offset;
for(x=0;x<3;x++) // cycle through banks
{
if(!(m_alu.bank_disable & (1 << x)))
{
mask = (m_video_ram[(offset & 0x3fff) + (x * 0x4000) + (page * 0xc000)]);
dat = mask & m_alu.mask;
alu_mask_write(offset,x,dat);
}
}
}
void fm77_state::alu_function_tilepaint(uint32_t offset)
{
// TILEPAINT - writes to VRAM based on the tilepaint colour registers
int x;
uint8_t dat = 0;
int page = 0;
uint8_t mask;
if(m_alu.command & 0x40)
alu_function_compare(offset);
if(offset >= 0xc000)
{
page = 1;
offset += m_video.vram_offset2;
}
else
offset += m_video.vram_offset;
for(x=0;x<3;x++) // cycle through banks
{
if(!(m_alu.bank_disable & (1 << x)))
{
switch(x)
{
case 0:
dat = m_alu.tilepaint_b;
break;
case 1:
dat = m_alu.tilepaint_r;
break;
case 2:
dat = m_alu.tilepaint_g;
break;
}
dat &= ~m_alu.mask;
mask = (m_video_ram[(offset & 0x3fff) + (x * 0x4000) + (page * 0xc000)]) & m_alu.mask;
dat |= mask;
alu_mask_write(offset,x,dat);
}
}
}
void fm77_state::fm7_alu_function(uint32_t offset)
{
switch(m_alu.command & 0x07)
{
case 0x00: // PSET
alu_function_pset(offset);
break;
case 0x02: // OR
alu_function_or(offset);
break;
case 0x03: // AND
alu_function_and(offset);
break;
case 0x04: // XOR
alu_function_xor(offset);
break;
case 0x05: // NOT
alu_function_not(offset);
break;
case 0x06: // TILEPAINT
alu_function_tilepaint(offset);
break;
case 0x07: // COMPARE
alu_function_compare(offset);
break;
case 0x01:
default:
alu_function_invalid(offset);
}
}
uint32_t fm77_state::av_line_set_pixel(int x, int y)
{
uint32_t addr;
static const uint8_t pixel_mask[8] = {0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0xfe };
if(m_video.modestatus & 0x40) // 320 pixels wide
{
addr = (x >> 3) + (y * 40);
}
else // 640 pixels wide
{
addr = (x >> 3) + (y * 80);
}
addr += (m_alu.addr_offset << 1);
addr &= 0x3fff;
if(m_video.active_video_page != 0)
addr += 0xc000;
if(m_alu.command & 0x80) // ALU must be active
{
m_alu.mask = pixel_mask[x & 0x07];
fm7_alu_function(addr);
}
return addr;
}
void fm77_state::av_line_draw()
{
int x1 = m_alu.x0;
int x2 = m_alu.x1;
int y1 = m_alu.y0;
int y2 = m_alu.y1;
int dx = abs(x2 - x1);
int dy = abs(y2 - y1);
int stepx, stepy;
int err,err2;
int byte_count = 0;
if(x1 < x2)
stepx = 1;
else
stepx = -1;
if(y1 < y2)
stepy = 1;
else
stepy = -1;
err = dx - dy;
for(;;)
{
av_line_set_pixel(x1, y1);
byte_count++;
if(x1 == x2 && y1 == y2)
break;
err2 = 2*err;
if(err2 > -dy)
{
err -= dy;
x1 += stepx;
}
if(err2 < dx)
{
err += dx;
y1 += stepy;
}
}
// set timer to disable busy flag
// 1/16 us for each byte changed
m_alu_task_end_timer->adjust(attotime::from_usec(byte_count/16));
}
uint8_t fm7_state::vram_r(offs_t offset)
{
int offs;
uint16_t page = 0x0000;
if(m_video.active_video_page != 0)
page = 0xc000;
if(offset < 0x4000 && (m_video.multi_page & 0x01))
return 0xff;
if((offset < 0x8000 && offset >=0x4000) && (m_video.multi_page & 0x02))
return 0xff;
if((offset < 0xc000 && offset >=0x8000) && (m_video.multi_page & 0x04))
return 0xff;
if(m_alu.command & 0x80) // ALU active, writes to VRAM even when reading it (go figure)
{
fm7_alu_function(offset+page);
}
if(m_video.modestatus & 0x40)
{
if(m_video.active_video_page != 0)
offs = (offset & 0xe000) | ((offset + m_video.vram_offset2) & 0x1fff);
else
offs = (offset & 0xe000) | ((offset + m_video.vram_offset) & 0x1fff);
}
else
{
if(m_video.active_video_page != 0)
offs = (offset & 0xc000) | ((offset + m_video.vram_offset2) & 0x3fff);
else
offs = (offset & 0xc000) | ((offset + m_video.vram_offset) & 0x3fff);
}
return m_video_ram[offs + page];
}
void fm7_state::vram_w(offs_t offset, uint8_t data)
{
int offs;
uint16_t page = 0x0000;
if(m_video.active_video_page != 0)
page = 0xc000;
if(offset < 0x4000 && (m_video.multi_page & 0x01))
return;
if((offset < 0x8000 && offset >=0x4000) && (m_video.multi_page & 0x02))
return;
if((offset < 0xc000 && offset >=0x8000) && (m_video.multi_page & 0x04))
return;
if(m_alu.command & 0x80) // ALU active
{
fm7_alu_function(offset+page);
return;
}
if(m_video.modestatus & 0x40)
{
if(m_video.active_video_page != 0)
offs = (offset & 0xe000) | ((offset + m_video.vram_offset2) & 0x1fff);
else
offs = (offset & 0xe000) | ((offset + m_video.vram_offset) & 0x1fff);
}
else
{
if(m_video.active_video_page != 0)
offs = (offset & 0xc000) | ((offset + m_video.vram_offset2) & 0x3fff);
else
offs = (offset & 0xc000) | ((offset + m_video.vram_offset) & 0x3fff);
}
// if(m_video.vram_access != 0)
m_video_ram[offs+page] = data;
}
/*
* Sub CPU: I/O port 0xd408
*
* On read, enables the CRT display
* On write, disables the CRT display
*/
uint8_t fm7_state::crt_r()
{
m_video.crt_enable = 1;
return 0xff;
}
void fm7_state::crt_w(uint8_t data)
{
m_video.crt_enable = 0;
}
/*
* Sub CPU: I/O ports 0xd40e - 0xd40f
*
* 0xd40e: bits 0-6 - offset in bytes (high byte) (bit 6 is used for 400 line video only)
* 0xd40f: bits 0-7 - offset in bytes (low byte)
*/
void fm7_state::vram_offset_w(offs_t offset, uint8_t data)
{
uint16_t new_offset = 0;
switch(offset)
{
case 0:
if(m_video.active_video_page != 0)
new_offset = ((data & 0x3f) << 8) | (m_video.vram_offset2 & 0x00ff);
else
new_offset = ((data & 0x3f) << 8) | (m_video.vram_offset & 0x00ff);
break;
case 1: // low 5 bits are used on FM-77AV and later only
if(m_type == SYS_FM7)
new_offset = (m_video.vram_offset & 0xff00) | (data & 0xe0);
else
{
if(m_video.active_video_page != 0)
{
if(m_video.fine_offset != 0)
new_offset = (m_video.vram_offset2 & 0xff00) | (data & 0xff);
else
new_offset = (m_video.vram_offset2 & 0xff00) | (data & 0xe0);
}
else
{
if(m_video.fine_offset != 0)
new_offset = (m_video.vram_offset & 0xff00) | (data & 0xff);
else
new_offset = (m_video.vram_offset & 0xff00) | (data & 0xe0);
}
}
break;
}
if(m_video.active_video_page != 0)
m_video.vram_offset2 = new_offset;
else
m_video.vram_offset = new_offset;
}
/*
* Main CPU: port 0xfd37
* Multipage
* Port is write-only
*
* bits 6-4: VRAM planes to display (G,R,B) (1=disable)
* bits 2-0: VRAM CPU access (G,R,B) (1=disable)
*/
void fm7_state::multipage_w(uint8_t data)
{
m_video.multi_page = data & 0x77;
}
/*
* Main CPU: I/O ports 0xfd38-0xfd3f
* Colour palette.
* Each port represents one of eight colours. Palette is 3-bit.
* bit 2 = Green
* bit 1 = Red
* bit 0 = Blue
*/
uint8_t fm7_state::palette_r(offs_t offset)
{
return m_video.fm7_pal[offset];
}
void fm7_state::palette_w(offs_t offset, uint8_t data)
{
m_palette->set_pen_color(offset, rgb_t(pal1bit(data >> 1), pal1bit(data >> 2), pal1bit(data >> 0)));
m_video.fm7_pal[offset] = data & 0x07;
}
/*
* Main CPU: 0xfd30 - 0xfd34
* Analog colour palette (FM-77AV and later only)
* All ports are write-only.
*
* fd30: colour select(?) high 4 bits (LC11-LC8)
* fd31: colour select(?) low 8 bits (LC7-LC0)
* fd32: blue level (4 bits)
* fd33: red level (4 bits)
* fd34: green level (4 bits)
*/
void fm77_state::av_analog_palette_w(offs_t offset, uint8_t data)
{
int val;
switch(offset)
{
case 0:
val = ((data & 0x0f) << 8) | (m_video.fm77av_pal_selected & 0x00ff);
m_video.fm77av_pal_selected = val;
break;
case 1:
val = data | (m_video.fm77av_pal_selected & 0x0f00);
m_video.fm77av_pal_selected = val;
break;
case 2:
m_av_palette->set_pen_blue_level(m_video.fm77av_pal_selected, data << 4);
break;
case 3:
m_av_palette->set_pen_red_level(m_video.fm77av_pal_selected, data << 4);
break;
case 4:
m_av_palette->set_pen_green_level(m_video.fm77av_pal_selected, data << 4);
break;
}
}
/*
* Sub CPU: 0xd430 - BUSY/NMI/Bank register (FM77AV series only)
*
* On read: bit 7 - 0 if in VBlank
* bit 4 - ALU busy(0)/ready(1)
* bit 2 - VSync status (1 if active?)
* bit 0 - RESET
*
* On write: bits 1-0 - CGROM select (maps to 0xd800)
* bit 2 - fine offset enable (enables OA4-OA0 bits in VRAM offset)
* bit 5 - active VRAM page
* bit 6 - display VRAM page
* bit 7 - NMI mask register (1=mask)
*/
uint8_t fm77_state::av_video_flags_r()
{
uint8_t ret = 0xff;
if(m_screen->vblank())
ret &= ~0x80;
if(m_alu.busy != 0)
ret &= ~0x10;
if(m_video.vsync_flag == 0)
ret &= ~0x04;
if(!m_video.sub_reset)
ret &= ~0x01;
return ret;
}
void fm77_state::av_video_flags_w(uint8_t data)
{
uint8_t* RAM = memregion("subsyscg")->base();
m_video.cgrom = data & 0x03;
membank("bank20")->set_base(RAM+(m_video.cgrom*0x800));
m_video.fine_offset = data & 0x04;
m_video.active_video_page = data & 0x20;
m_video.display_video_page = data & 0x40;
m_video.nmi_mask = data & 0x80;
}
/*
* Main CPU: port 0xfd12
* Sub mode status register (FM-77AV or later)
* bit 6 (R/W) - Video mode width(?) 0=640 (default) 1=320.
* bit 1 (R/O) - DISPTMG status (0=blank)
* bit 0 (R/O) - VSync status (1=sync?)
*/
uint8_t fm77_state::av_sub_modestatus_r()
{
uint8_t ret = 0x00;
ret |= 0xbc;
ret |= (m_video.modestatus & 0x40);
if(!m_screen->vblank())
ret |= 0x02;
if(m_video.vsync_flag != 0)
ret |= 0x01;
return ret;
}
void fm77_state::av_sub_modestatus_w(uint8_t data)
{
m_video.modestatus = data & 0x40;
if(data & 0x40)
{
rectangle rect(0, 320-1, 0, 200-1);
m_screen->configure(512, 262, rect, m_screen->frame_period().as_attoseconds());
}
else
{
rectangle rect(0, 640-1, 0, 200-1);
m_screen->configure(1024, 262, rect, m_screen->frame_period().as_attoseconds());
}
}
/*
* Main CPU: port 0xfd13
* Sub Bank select register
*
* bits 1 and 0 select which subsys ROM to be banked into sub CPU space
* on the FM-77AV40 and later, bit 2 can also selected to bank in sub monitor RAM.
*/
void fm77_state::av_sub_bank_w(uint8_t data)
{
// uint8_t* RAM = memregion("sub")->base();
uint8_t* ROM;
if((data & 0x03) == (m_sb_prev & 0x03))
return;
m_video.subrom = data & 0x03;
switch (data & 0x03)
{
case 0x00: // Type C, 640x200 (as used on the FM-7)
ROM = memregion("subsys_c")->base();
// membank(20)->set_base(ROM);
membank("bank21")->set_base(ROM+0x800);
logerror("VID: Sub ROM Type C selected\n");
break;
case 0x01: // Type A, 640x200
ROM = memregion("subsys_a")->base();
// membank(20)->set_base(RAM+0xd800);
membank("bank21")->set_base(ROM);
logerror("VID: Sub ROM Type A selected\n");
break;
case 0x02: // Type B, 320x200
ROM = memregion("subsys_b")->base();
// membank(20)->set_base(RAM+0xd800);
membank("bank21")->set_base(ROM);
logerror("VID: Sub ROM Type B selected\n");
break;
case 0x03: // CG Font?
ROM = memregion("subsyscg")->base();
// membank(20)->set_base(RAM+0xd800);
membank("bank21")->set_base(ROM);
logerror("VID: Sub ROM CG selected\n");
break;
}
// reset sub CPU, set busy flag, set reset flag
m_sub->pulse_input_line(INPUT_LINE_RESET, attotime::zero);
m_video.sub_busy = 0x80;
m_video.sub_halt = 0;
m_video.sub_reset = 1;
m_sb_prev = data;
}
/*
* Sub CPU: ports 0xd410-0xd42b (FM-77AV and later only)
* Video operations
*
* 0xd410 (R/W): Command register
* bit 7: 0=DIS 1=Start
* bits 6-5: MBIT1, MBIT2
* bits 2-0: Draw mode
* 0 0 0 - PSET
* 0 1 0 - OR
* 0 1 1 - AND
* 1 0 0 - XOR
* 1 0 1 - NOT
* 1 1 0 - TILEPAINT
* 1 1 1 - COMPARE
* 0xd411 (R/W): Logical colour (bits 2-0, G-R-B)
* 0xd412 (R/W): Mask register
* 0xd413 (R) : Compare data (?)
* 0xd413-1a(W): Compare registers (bits 2-0, G-R-B, 1=mask (bit 7))
* 0xd41b (R/W): Bank disable register (bits 2-0, G-R-B, 1=disable, bit 3 must always be 1)
* 0xd41c-1e(W): Tilepaint registers (B-R-G)
* 0xd420-21(W): Line Address offset register (High-Low, A13-A1)
* 0xd422-23(W): Line style pattern register (High-Low, P15-P0)
* 0xd424-25(W): Line X0 (High-Low, X9-X0)
* 0xd426-27(W): Line Y0 (High-Low, Y8-Y0)
* 0xd428-29(W): Line X1 (High-Low, X9-X0)
* 0xd42a-2b(W): Line Y1 (High-Low, Y8-Y0)
*/
uint8_t fm77_state::av_alu_r(offs_t offset)
{
switch(offset)
{
case 0x00:
logerror("ALU: read from command register (%02x)\n",m_alu.command);
return m_alu.command;
case 0x01:
logerror("ALU: read from logical colour\n");
return m_alu.lcolour;
case 0x02:
logerror("ALU: read from mask register\n");
return m_alu.mask;
case 0x03:
logerror("ALU: read from compare data register (%02x)\n",m_alu.compare_data);
return m_alu.compare_data;
case 0x0b:
logerror("ALU: read from bank disable register\n");
return 0xf7 | m_alu.bank_disable;
default:
logerror("ALU: read from invalid register 0x%02x\n",offset);
return 0xff;
}
}
void fm77_state::av_alu_w(offs_t offset, uint8_t data)
{
uint16_t dat;
switch(offset)
{
case 0x00:
m_alu.command = data;
logerror("ALU: write to command register - %02x\n",data);
break;
case 0x01:
m_alu.lcolour = data & 0x07;
logerror("ALU: write to logical colour - %02x\n",data);
break;
case 0x02:
m_alu.mask = data;
logerror("ALU: write to mask register - %02x\n",data);
break;
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07:
case 0x08:
case 0x09:
case 0x0a:
m_alu.compare[offset-3] = data;
logerror("ALU: write to compare register %i - %02x\n",offset-3,data);
break;
case 0x0b:
m_alu.bank_disable = data & 0x03;
// logerror("ALU: write to bank disable register - %02x\n",data);
break;
case 0x0c:
m_alu.tilepaint_b = data;
// logerror("ALU: write to tilepaint (blue) register - %02x\n",data);
break;
case 0x0d:
m_alu.tilepaint_r = data;
// logerror("ALU: write to tilepaint (red) register - %02x\n",data);
break;
case 0x0e:
m_alu.tilepaint_g = data;
// logerror("ALU: write to tilepaint (green) register - %02x\n",data);
break;
case 0x10:
dat = ((data & 0x1f) << 8) | (m_alu.addr_offset & 0x00ff);
m_alu.addr_offset = dat;
// logerror("ALU: write to address offset (high) register - %02x (%04x)\n",data,m_alu.addr_offset);
break;
case 0x11:
dat = (m_alu.addr_offset & 0xff00) | data;
m_alu.addr_offset = dat;
// logerror("ALU: write to address offset (low) register - %02x (%04x)\n",data,m_alu.addr_offset);
break;
case 0x12:
dat = (data << 8) | (m_alu.line_style & 0x00ff);
m_alu.line_style = dat;
// logerror("ALU: write to line style (high) register - %02x (%04x)\n",data,m_alu.line_style);
break;
case 0x13:
dat = (m_alu.line_style & 0xff00) | data;
m_alu.line_style = dat;
// logerror("ALU: write to line style (low) register - %02x (%04x)\n",data,m_alu.line_style);
break;
case 0x14:
dat = ((data & 0x03) << 8) | (m_alu.x0 & 0x00ff);
m_alu.x0 = dat;
// logerror("ALU: write to X0 (high) register - %02x (%04x)\n",data,m_alu.x0);
break;
case 0x15:
dat = (m_alu.x0 & 0xff00) | data;
m_alu.x0 = dat;
// logerror("ALU: write to X0 (low) register - %02x (%04x)\n",data,m_alu.x0);
break;
case 0x16:
dat = ((data & 0x01) << 8) | (m_alu.y0 & 0x00ff);
m_alu.y0 = dat;
// logerror("ALU: write to Y0 (high) register - %02x (%04x)\n",data,m_alu.y0);
break;
case 0x17:
dat = (m_alu.y0 & 0xff00) | data;
m_alu.y0 = dat;
// logerror("ALU: write to Y0 (low) register - %02x (%04x)\n",data,m_alu.y0);
break;
case 0x18:
dat = ((data & 0x03) << 8) | (m_alu.x1 & 0x00ff);
m_alu.x1 = dat;
// logerror("ALU: write to X1 (high) register - %02x (%04x)\n",data,m_alu.x1);
break;
case 0x19:
dat = (m_alu.x1 & 0xff00) | data;
m_alu.x1 = dat;
// logerror("ALU: write to X1 (low) register - %02x (%04x)\n",data,m_alu.x1);
break;
case 0x1a:
dat = ((data & 0x01) << 8) | (m_alu.y1 & 0x00ff);
m_alu.y1 = dat;
// logerror("ALU: write to Y1 (high) register - %02x (%04x)\n",data,m_alu.y1);
break;
case 0x1b:
dat = (m_alu.y1 & 0xff00) | data;
m_alu.y1 = dat;
// draw line
av_line_draw();
// logerror("ALU: write to Y1 (low) register - %02x (%04x)\n",data,m_alu.y1);
break;
default:
logerror("ALU: write 0x%02x to invalid register 0x%02x\n",data,offset);
}
}
TIMER_CALLBACK_MEMBER(fm77_state::av_vsync)
{
if(param == 0) // start of vsync
{
m_video.vsync_flag = 1;
m_vsync_timer->adjust(attotime::from_usec(510),1); // VSync length for 200 line modes = 0.51ms
}
else
{
m_video.vsync_flag = 0;
m_vsync_timer->adjust(m_screen->time_until_vblank_end());
}
}
void fm7_state::video_start()
{
m_video.sub_busy = 0;
m_video.sub_halt = 0;
m_video.vram_access = 0;
m_video.crt_enable = 0;
m_video.vram_offset = 0x0000;
m_video.vram_offset2 = 0x0000;
m_video.sub_reset = 0;
m_video.multi_page = 0;
m_video.subrom = 0;
m_video.cgrom = 0;
m_video.modestatus = 0;
m_video.fine_offset = 0;
m_video.nmi_mask = 0;
m_video.active_video_page = 0;
m_video.display_video_page = 0;
m_video.vsync_flag = 0;
m_alu.command = 0;
}
uint32_t fm7_state::screen_update_fm7(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
uint8_t code_r = 0,code_g = 0,code_b = 0;
uint8_t code_r2 = 0,code_g2 = 0,code_b2 = 0;
uint8_t code_r3 = 0,code_g3 = 0,code_b3 = 0;
uint8_t code_r4 = 0,code_g4 = 0,code_b4 = 0;
uint16_t page = 0x0000;
if(m_video.display_video_page != 0)
page = 0xc000;
if(m_video.crt_enable == 0)
return 0;
if(m_video.modestatus & 0x40) // 320x200 mode
{
for (int y = 0; y < 200; y++)
{
for (int x = 0; x < 40; x++)
{
if(!(m_video.multi_page & 0x40))
{
code_r = m_video_ram[0x8000 + ((y*40 + x + m_video.vram_offset) & 0x1fff)];
code_r2 = m_video_ram[0xa000 + ((y*40 + x + m_video.vram_offset) & 0x1fff)];
code_r3 = m_video_ram[0x14000 + ((y*40 + x + m_video.vram_offset2) & 0x1fff)];
code_r4 = m_video_ram[0x16000 + ((y*40 + x + m_video.vram_offset2) & 0x1fff)];
}
if(!(m_video.multi_page & 0x20))
{
code_g = m_video_ram[0x4000 + ((y*40 + x + m_video.vram_offset) & 0x1fff)];
code_g2 = m_video_ram[0x6000 + ((y*40 + x + m_video.vram_offset) & 0x1fff)];
code_g3 = m_video_ram[0x10000 + ((y*40 + x + m_video.vram_offset2) & 0x1fff)];
code_g4 = m_video_ram[0x12000 + ((y*40 + x + m_video.vram_offset2) & 0x1fff)];
}
if(!(m_video.multi_page & 0x10))
{
code_b = m_video_ram[0x0000 + ((y*40 + x + m_video.vram_offset) & 0x1fff)];
code_b2 = m_video_ram[0x2000 + ((y*40 + x + m_video.vram_offset) & 0x1fff)];
code_b3 = m_video_ram[0xc000 + ((y*40 + x + m_video.vram_offset2) & 0x1fff)];
code_b4 = m_video_ram[0xe000 + ((y*40 + x + m_video.vram_offset2) & 0x1fff)];
}
for (int b = 0; b < 8; b++)
{
uint16_t col;
col = (((code_b >> b) & 0x01) ? 8 : 0) | (((code_b2 >> b) & 0x01) ? 4 : 0) | (((code_b3 >> b) & 0x01) ? 2 : 0) | (((code_b4 >> b) & 0x01) ? 1 : 0);
col |= (((code_g >> b) & 0x01) ? 128 : 0) | (((code_g2 >> b) & 0x01) ? 64 : 0) | (((code_g3 >> b) & 0x01) ? 32 : 0) | (((code_g4 >> b) & 0x01) ? 16 : 0);
col |= (((code_r >> b) & 0x01) ? 2048 : 0) | (((code_r2 >> b) & 0x01) ? 1024 : 0) | (((code_r3 >> b) & 0x01) ? 512 : 0) | (((code_r4 >> b) & 0x01) ? 256 : 0);
bitmap.pix(y, x*8+(7-b)) = m_av_palette->pen_color(col);
}
}
}
}
else
{
for (int y = 0; y < 200; y++)
{
for (int x = 0; x < 80; x++)
{
if(!(m_video.multi_page & 0x40))
code_r = m_video_ram[page + 0x8000 + ((y*80 + x + m_video.vram_offset) & 0x3fff)];
if(!(m_video.multi_page & 0x20))
code_g = m_video_ram[page + 0x4000 + ((y*80 + x + m_video.vram_offset) & 0x3fff)];
if(!(m_video.multi_page & 0x10))
code_b = m_video_ram[page + 0x0000 + ((y*80 + x + m_video.vram_offset) & 0x3fff)];
for (int b = 0; b < 8; b++)
{
uint16_t col = (((code_r >> b) & 0x01) ? 4 : 0) + (((code_g >> b) & 0x01) ? 2 : 0) + (((code_b >> b) & 0x01) ? 1 : 0);
bitmap.pix(y, x*8+(7-b)) = m_palette->pen_color(col);
}
}
}
}
return 0;
}
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