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vga.js
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"use strict";
var
/**
* Always 64k
* @const
*/
VGA_BANK_SIZE = 64 * 1024,
/** @const */
MAX_XRES = 2560,
/** @const */
MAX_YRES = 1600,
/** @const */
MAX_BPP = 32;
/**
* @constructor
*/
function VGAScreen(cpu, adapter, vga_memory_size)
{
if(adapter === undefined)
{
this.adapter = new VGADummyAdapter();
}
else
{
this.adapter = adapter;
}
this.vga_memory_size = vga_memory_size;
/** @type {number} */
this.cursor_address = 0;
/** @type {number} */
this.cursor_scanline_start = 0xE;
/** @type {number} */
this.cursor_scanline_end = 0xF;
/**
* Number of columns in text mode
* @type {number}
*/
this.max_cols = 0;
/**
* Number of rows in text mode
* @type {number}
*/
this.max_rows = 0;
/**
* Width in pixels in graphical mode
* @type {number}
*/
this.screen_width = 0;
/**
* Height in pixels in graphical mode
* @type {number}
*/
this.screen_height = 0;
/**
* video memory start address
* @type {number}
*/
this.start_address = 0;
/** @type {boolean} */
this.graphical_mode_is_linear = true;
/** @type {boolean} */
this.graphical_mode = false;
/** @type {boolean} */
this.do_complete_redraw = false;
/*
* VGA palette containing 256 colors for video mode 13 etc.
* Needs to be initialised by the BIOS
*/
this.vga256_palette = new Int32Array(256);
// VGA latches
this.latch0 = 0;
this.latch1 = 0;
this.latch2 = 0;
this.latch3 = 0;
/** @type {number} */
this.svga_width = 0;
/** @type {number} */
this.svga_height = 0;
/** @type {number} */
this.text_mode_width = 80;
this.plane0;
this.plane1;
this.plane2;
this.plane3;
// 4 times 64k
this.vga_memory = null;
this.svga_memory = null;
this.svga_memory16 = null;
this.svga_memory32 = null;
this.svga_enabled = false;
/** @type {number} */
this.svga_bpp = 0;
/**
* The video buffer offset created by VBE_DISPI_INDEX_Y_OFFSET
* In bytes
* @type {number}
*/
this.svga_offset = 0;
// Experimental, could probably need some changes
// 01:00.0 VGA compatible controller: NVIDIA Corporation GT216 [GeForce GT 220] (rev a2)
this.pci_space = [
0xde, 0x10, 0x20, 0x0a, 0x07, 0x00, 0x00, 0x00, 0xa2, 0x00, 0x00, 0x03, 0x00, 0x00, 0x80, 0x00,
0x08, 0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x01, 0x00, 0x00,
];
this.pci_id = 0x12 << 3;
this.pci_bars = [
{
size: this.vga_memory_size,
},
];
cpu.devices.pci.register_device(this);
this.stats = {
is_graphical: false,
res_x: 0,
res_y: 0,
bpp: 0,
};
this.index_crtc = 0;
// index for setting colors through port 3C9h
this.dac_color_index = 0;
this.attribute_controller_index = -1;
this.dac_map = new Uint8Array(0x10);
this.sequencer_index = -1;
// bitmap of planes 0-3
this.plane_write_bm = 0xF;
this.sequencer_memory_mode = 0;
this.graphics_index = -1;
this.plane_read = 0, // value 0-3, which plane to read
this.planar_mode = 0;
this.planar_rotate_reg = 0;
this.planar_bitmap = 0xFF;
this.max_scan_line = 0;
this.miscellaneous_output_register = 0xff;
this.port_3DA_value = 0xFF;
var io = cpu.io;
io.register_write(0x3C0, this.port3C0_write, this);
io.register_read(0x3C0, this.port3C0_read, this);
io.register_read(0x3C1, this.port3C1_read, this);
io.register_write(0x3C2, this.port3C2_write, this);
io.register_write(0x3C4, this.port3C4_write, this);
io.register_read(0x3C4, this.port3C4_read, this);
io.register_write(0x3C5, this.port3C5_write, this);
io.register_read(0x3C5, this.port3C5_read, this);
io.register_write(0x3CE, this.port3CE_write, this);
io.register_read(0x3CE, this.port3CE_read, this);
io.register_write(0x3CF, this.port3CF_write, this);
io.register_read(0x3CF, this.port3CF_read, this);
io.register_write(0x3C7, this.port3C7_write, this);
io.register_write(0x3C8, this.port3C8_write, this);
io.register_write(0x3C9, this.port3C9_write, this);
io.register_read(0x3CC, this.port3CC_read, this);
io.register_write(0x3D4, this.port3D4_write, this);
io.register_write(0x3D5, this.port3D5_write, this);
io.register_read(0x3D5, this.port3D5_read, this);
io.register_read(0x3DA, this.port3DA_read, this);
// Bochs VBE Extensions
// http://wiki.osdev.org/Bochs_VBE_Extensions
this.dispi_index = -1;
this.dispi_value = -1;
this.dispi_enable_value = 0;
io.register_write(0x1CE, this.port1CE_write, this);
io.register_write(0x1CF, this.port1CF_write, this);
io.register_write(0x1D0, this.port1D0_write, this);
io.register_read(0x1CF, this.port1CF_read, this);
io.register_read(0x1D0, this.port1D0_read, this);
if(this.vga_memory_size === undefined || this.vga_memory_size < 4 * VGA_BANK_SIZE)
{
this.vga_memory_size = 4 * VGA_BANK_SIZE;
dbg_log("vga memory size rounded up to " + this.vga_memory_size, LOG_VGA);
}
else if(this.vga_memory_size & (VGA_BANK_SIZE - 1))
{
// round up to next 64k
this.vga_memory_size |= VGA_BANK_SIZE - 1;
this.vga_memory_size++;
}
this.svga_memory = new Uint8Array(this.vga_memory_size);
this.svga_memory16 = new Uint16Array(this.svga_memory.buffer);
this.svga_memory32 = new Int32Array(this.svga_memory.buffer);
this.vga_memory = new Uint8Array(this.svga_memory.buffer, 0, 4 * VGA_BANK_SIZE);
this.plane0 = new Uint8Array(this.svga_memory.buffer, 0 * VGA_BANK_SIZE, VGA_BANK_SIZE);
this.plane1 = new Uint8Array(this.svga_memory.buffer, 1 * VGA_BANK_SIZE, VGA_BANK_SIZE);
this.plane2 = new Uint8Array(this.svga_memory.buffer, 2 * VGA_BANK_SIZE, VGA_BANK_SIZE);
this.plane3 = new Uint8Array(this.svga_memory.buffer, 3 * VGA_BANK_SIZE, VGA_BANK_SIZE);
this.set_size_text(80, 25);
this.update_cursor_scanline();
io.mmap_register(0xA0000, 0x20000,
this.vga_memory_read.bind(this),
this.vga_memory_write.bind(this)
);
io.mmap_register(0xE0000000, this.vga_memory_size,
this.svga_memory_read8.bind(this), this.svga_memory_write8.bind(this),
this.svga_memory_read32.bind(this), this.svga_memory_write32.bind(this)
);
/** @const */
this._state_skip = [
"adapter",
"svga_memory16",
"svga_memory32",
"vga_memory",
"plane0",
"plane1",
"plane2",
"plane3",
];
};
VGAScreen.prototype._state_restore = function()
{
this.svga_memory16 = new Uint16Array(this.svga_memory.buffer);
this.svga_memory32 = new Int32Array(this.svga_memory.buffer);
this.vga_memory = new Uint8Array(this.svga_memory.buffer, 0, 4 * VGA_BANK_SIZE);
this.plane0 = new Uint8Array(this.svga_memory.buffer, 0 * VGA_BANK_SIZE, VGA_BANK_SIZE);
this.plane1 = new Uint8Array(this.svga_memory.buffer, 1 * VGA_BANK_SIZE, VGA_BANK_SIZE);
this.plane2 = new Uint8Array(this.svga_memory.buffer, 2 * VGA_BANK_SIZE, VGA_BANK_SIZE);
this.plane3 = new Uint8Array(this.svga_memory.buffer, 3 * VGA_BANK_SIZE, VGA_BANK_SIZE);
this.adapter.set_mode(this.graphical_mode || this.svga_enabled);
if(this.graphical_mode || this.svga_enabled)
{
// TODO: Consider non-svga modes
this.set_size_graphical(this.svga_width, this.svga_height);
}
else
{
this.set_size_text(this.max_cols, this.max_rows);
this.update_cursor_scanline();
this.update_cursor();
}
this.do_complete_redraw = true;
};
VGAScreen.prototype.vga_memory_read = function(addr)
{
addr -= 0xA0000;
if(!this.graphical_mode || this.graphical_mode_is_linear)
{
return this.vga_memory[addr];
}
// TODO: "Color don't care"
//dbg_assert((this.planar_mode & 0x08) === 0, "unimplemented");
// planar mode
addr &= 0xFFFF;
this.latch0 = this.plane0[addr];
this.latch1 = this.plane1[addr];
this.latch2 = this.plane2[addr];
this.latch3 = this.plane3[addr];
return this.vga_memory[this.plane_read << 16 | addr];
};
VGAScreen.prototype.vga_memory_write = function(addr, value)
{
addr -= 0xA0000;
if(this.graphical_mode)
{
if(this.graphical_mode_is_linear)
{
this.vga_memory_write_graphical_linear(addr, value);
}
else
{
this.vga_memory_write_graphical_planar(addr, value);
}
}
else
{
this.vga_memory_write_text_mode(addr, value);
}
};
VGAScreen.prototype.vga_memory_write_graphical_linear = function(addr, value)
{
var offset = addr << 2,
color = this.vga256_palette[value];
this.adapter.put_pixel_linear(offset | 2, color >> 16 & 0xFF);
this.adapter.put_pixel_linear(offset | 1, color >> 8 & 0xFF);
this.adapter.put_pixel_linear(offset, color & 0xFF);
this.vga_memory[addr] = value;
};
VGAScreen.prototype.vga_memory_write_graphical_planar = function(addr, value)
{
if(addr > 0xFFFF)
{
return;
}
// TODO:
// Replace 4 byte operations with single double word operations
var write,
plane0_byte,
plane1_byte,
plane2_byte,
plane3_byte;
var write_mode = this.planar_mode & 3;
// not implemented:
// - Planar mode 3
// - Rotation
// - Shift mode
// - Host Odd/Even
dbg_assert((this.planar_rotate_reg & 7) === 0, "unimplemented");
dbg_assert(write_mode !== 3, "unimplemented");
dbg_assert((this.planar_mode & 0x70) === 0, "unimplemented");
if(write_mode === 0)
{
plane0_byte = plane1_byte = plane2_byte = plane3_byte = value;
}
else if(write_mode === 2)
{
if(this.plane_write_bm & 1)
{
write = value & 1 ? 0xFF : 0;
plane0_byte = this.latch0 & ~this.planar_bitmap | write & this.planar_bitmap;
}
if(this.plane_write_bm & 2)
{
write = value & 2 ? 0xFF : 0;
plane1_byte = this.latch1 & ~this.planar_bitmap | write & this.planar_bitmap;
}
if(this.plane_write_bm & 4)
{
write = value & 4 ? 0xFF : 0;
plane2_byte = this.latch2 & ~this.planar_bitmap | write & this.planar_bitmap;
}
if(this.plane_write_bm & 8)
{
write = value & 8 ? 0xFF : 0;
plane3_byte = this.latch3 & ~this.planar_bitmap | write & this.planar_bitmap;
}
}
if(write_mode === 0 || write_mode === 2)
{
switch(this.planar_rotate_reg & 0x18)
{
case 0x08:
plane0_byte &= this.latch0;
plane1_byte &= this.latch1;
plane2_byte &= this.latch2;
plane3_byte &= this.latch3;
break;
case 0x10:
plane0_byte |= this.latch0;
plane1_byte |= this.latch1;
plane2_byte |= this.latch2;
plane3_byte |= this.latch3;
break;
case 0x18:
plane0_byte ^= this.latch0;
plane1_byte ^= this.latch1;
plane2_byte ^= this.latch2;
plane3_byte ^= this.latch3;
break;
}
if(this.plane_write_bm & 1)
{
plane0_byte = this.latch0 & ~this.planar_bitmap | plane0_byte & this.planar_bitmap;
}
if(this.plane_write_bm & 2)
{
plane1_byte = this.latch1 & ~this.planar_bitmap | plane1_byte & this.planar_bitmap;
}
if(this.plane_write_bm & 4)
{
plane2_byte = this.latch2 & ~this.planar_bitmap | plane2_byte & this.planar_bitmap;
}
if(this.plane_write_bm & 8)
{
plane3_byte = this.latch3 & ~this.planar_bitmap | plane3_byte & this.planar_bitmap;
}
}
else if(write_mode === 1)
{
plane0_byte = this.latch0;
plane1_byte = this.latch1;
plane2_byte = this.latch2;
plane3_byte = this.latch3;
}
if(this.plane_write_bm & 1)
{
this.plane0[addr] = plane0_byte;
}
else
{
plane0_byte = this.plane0[addr];
}
if(this.plane_write_bm & 2)
{
this.plane1[addr] = plane1_byte;
}
else
{
plane1_byte = this.plane1[addr];
}
if(this.plane_write_bm & 4)
{
this.plane2[addr] = plane2_byte;
}
else
{
plane2_byte = this.plane2[addr];
}
if(this.plane_write_bm & 8)
{
this.plane3[addr] = plane3_byte;
}
else
{
plane3_byte = this.plane3[addr];
}
if(addr >= (this.screen_width * this.screen_height << 3))
{
return;
}
// Shift these, so that the bits for the color are in
// the correct position in the while loop
plane1_byte <<= 1;
plane2_byte <<= 2;
plane3_byte <<= 3;
// 8 pixels per byte, we start at high (addr << 3 | 7)
// << 2 because we're using put_pixel_linear
var offset = (addr << 3 | 7) << 2;
for(var i = 0; i < 8; i++)
{
var color_index =
plane0_byte >> i & 1 |
plane1_byte >> i & 2 |
plane2_byte >> i & 4 |
plane3_byte >> i & 8,
color = this.vga256_palette[this.dac_map[color_index]];
this.adapter.put_pixel_linear(offset | 2, color >> 16);
this.adapter.put_pixel_linear(offset | 1, color >> 8 & 0xFF);
this.adapter.put_pixel_linear(offset, color & 0xFF);
offset -= 4;
}
};
VGAScreen.prototype.text_mode_redraw = function()
{
var addr = 0x18000 | this.start_address << 1,
chr,
color;
for(var row = 0; row < this.max_rows; row++)
{
for(var col = 0; col < this.max_cols; col++)
{
chr = this.vga_memory[addr];
color = this.vga_memory[addr | 1];
this.adapter.put_char(row, col, chr,
this.vga256_palette[color >> 4 & 0xF], this.vga256_palette[color & 0xF]);
addr += 2;
}
}
};
VGAScreen.prototype.graphical_linear_redraw = function()
{
// TODO
};
VGAScreen.prototype.graphical_planar_redraw = function()
{
var addr = 0;
for(var y = 0; y < this.screen_height; y++)
{
for(var x = 0; x < this.screen_width; x += 8)
{
for(var i = 0; i < 8; i++)
{
var index = y * this.screen_width + x << 2;
var color =
this.plane0[addr] >> i & 1 |
this.plane1[addr] >> i << 1 & 2 |
this.plane2[addr] >> i << 2 & 4 |
this.plane3[addr] >> i << 3 & 8;
this.adapter.put_pixel_linear32(index, this.vga256_palette[this.dac_map[color]]);
}
addr++;
}
}
};
VGAScreen.prototype.vga_memory_write_text_mode = function(addr, value)
{
if(addr < 0x18000)
{
return;
}
var memory_start = (addr - 0x18000 >> 1) - this.start_address,
row = memory_start / this.max_cols | 0,
col = memory_start % this.max_cols,
chr,
color;
if(addr & 1)
{
color = value;
chr = this.vga_memory[addr & ~1];
}
else
{
chr = value;
color = this.vga_memory[addr | 1];
}
this.adapter.put_char(row, col, chr,
this.vga256_palette[color >> 4 & 0xF], this.vga256_palette[color & 0xF]);
this.vga_memory[addr] = value;
};
VGAScreen.prototype.update_cursor = function()
{
var row = (this.cursor_address - this.start_address) / this.max_cols | 0,
col = (this.cursor_address - this.start_address) % this.max_cols;
row = Math.min(this.max_rows - 1, row);
this.adapter.update_cursor(row, col);
};
VGAScreen.prototype.svga_memory_read8 = function(addr)
{
return this.svga_memory[addr & 0xFFFFFFF];
};
VGAScreen.prototype.svga_memory_read32 = function(addr)
{
addr &= 0xFFFFFFF;
if(addr & 3)
{
return this.svga_memory[addr] | this.svga_memory[addr + 1] << 8 |
this.svga_memory[addr + 2] << 16 | this.svga_memory[addr + 3] << 24;
}
else
{
return this.svga_memory32[addr >> 2];
}
};
VGAScreen.prototype.svga_memory_write8 = function(addr, value)
{
addr &= 0xFFFFFFF;
this.svga_memory[addr] = value;
if(!this.svga_enabled)
{
return;
}
addr -= this.svga_offset;
if(addr < 0)
{
return;
}
switch(this.svga_bpp)
{
case 32:
// 4th byte is meaningless
if((addr & 3) !== 3)
{
this.adapter.put_pixel_linear(addr, value);
}
break;
case 24:
addr = (addr << 2) / 3 | 0;
this.adapter.put_pixel_linear(addr, value);
break;
case 16:
if(addr & 1)
{
var word = this.svga_memory16[addr >> 1],
red = word & 0x1F,
green = word >> 5 & 0x3F,
blue = value >> 3 & 0x1F;
blue = blue * 0xFF / 0x1F | 0;
green = green * 0xFF / 0x3F | 0;
red = red * 0xFF / 0x1F | 0;
addr <<= 1;
this.adapter.put_pixel_linear(addr, red);
this.adapter.put_pixel_linear(addr - 1, green);
this.adapter.put_pixel_linear(addr - 2, blue);
}
break;
case 8:
var color = this.vga256_palette[value],
offset = addr << 2;
this.adapter.put_pixel_linear(offset, color >> 16 & 0xFF);
this.adapter.put_pixel_linear(offset | 1, color >> 8 & 0xFF);
this.adapter.put_pixel_linear(offset | 2, color & 0xFF);
break;
default:
if(DEBUG)
{
throw "SVGA: Unsupported BPP: " + this.svga_bpp;
}
}
};
VGAScreen.prototype.svga_memory_write32 = function(addr, value)
{
addr &= 0xFFFFFFF;
if(addr & 3 || this.svga_bpp !== 32)
{
this.svga_memory_write8(addr, value & 0xFF);
this.svga_memory_write8(addr + 1, value >> 8 & 0xFF);
this.svga_memory_write8(addr + 2, value >> 16 & 0xFF);
this.svga_memory_write8(addr + 3, value >> 24 & 0xFF);
return;
}
this.svga_memory32[addr >> 2] = value;
if(!this.svga_enabled)
{
return;
}
addr -= this.svga_offset;
if(addr < 0)
{
return;
}
switch(this.svga_bpp)
{
case 32:
this.adapter.put_pixel_linear32(addr, value);
break;
default:
if(DEBUG)
{
throw "SVGA: Unsupported BPP: " + this.svga_bpp;
}
}
};
VGAScreen.prototype.svga_redraw = function()
{
var addr = this.svga_offset;
var count = this.svga_height * this.svga_width;
var pixel = 0;
if(this.svga_bpp === 32)
{
var buf32 = new Int32Array(this.svga_memory.buffer);
addr >>= 2;
count <<= 2;
for(; pixel < count; )
{
this.adapter.put_pixel_linear32(pixel, buf32[addr++]);
pixel += 4;
}
}
else if(this.svga_bpp === 24)
{
count <<= 2;
for(; pixel < count; )
{
this.adapter.put_pixel_linear(pixel++, this.svga_memory[addr++]);
this.adapter.put_pixel_linear(pixel++, this.svga_memory[addr++]);
this.adapter.put_pixel_linear(pixel++, this.svga_memory[addr++]);
pixel++;
}
}
else
{
// TODO
}
};
VGAScreen.prototype.timer = function(time)
{
if(this.do_complete_redraw)
{
this.do_complete_redraw = false;
if(this.svga_enabled)
{
this.svga_redraw();
}
else if(this.graphical_mode)
{
if(this.graphical_mode_is_linear)
{
this.graphical_linear_redraw();
}
else
{
this.graphical_planar_redraw();
}
}
else
{
this.text_mode_redraw();
}
}
this.adapter.timer();
};
VGAScreen.prototype.destroy = function()
{
};
/**
* @param {number} cols_count
* @param {number} rows_count
*/
VGAScreen.prototype.set_size_text = function(cols_count, rows_count)
{
this.max_cols = cols_count;
this.max_rows = rows_count;
this.adapter.set_size_text(cols_count, rows_count);
};
VGAScreen.prototype.set_size_graphical = function(width, height)
{
this.adapter.set_size_graphical(width, height);
};
VGAScreen.prototype.update_cursor_scanline = function()
{
this.adapter.update_cursor_scanline(this.cursor_scanline_start, this.cursor_scanline_end);
};
VGAScreen.prototype.set_video_mode = function(mode)
{
var is_graphical = false;
switch(mode)
{
case 0x03:
this.set_size_text(this.text_mode_width, 25);
break;
case 0x10:
this.screen_width = 640;
this.screen_height = 350;
is_graphical = true;
this.graphical_mode_is_linear = false;
break;
case 0x12:
this.screen_width = 640;
this.screen_height = 480;
is_graphical = true;
this.graphical_mode_is_linear = false;
break;
case 0x13:
this.screen_width = 320;
this.screen_height = 200;
is_graphical = true;
this.graphical_mode_is_linear = true;
break;
default:
}
this.adapter.set_mode(is_graphical);
this.stats.is_graphical = is_graphical;
if(is_graphical)
{
this.set_size_graphical(this.screen_width, this.screen_height);
this.stats.res_x = this.screen_width;
this.stats.res_y = this.screen_height;
this.stats.bpp = 8;
}
this.graphical_mode = is_graphical;
dbg_log("Current video mode: " + h(mode), LOG_VGA);
};
VGAScreen.prototype.port3C0_write = function(value)
{
if(this.attribute_controller_index === -1)
{
this.attribute_controller_index = value;
}
else
{
if(this.attribute_controller_index < 0x10)
{
this.dac_map[this.attribute_controller_index] = value;
}
else
switch(this.attribute_controller_index)
{
default:
dbg_log("3C0 / attribute controller write " + h(this.attribute_controller_index) + ": " + h(value), LOG_VGA);
}
this.attribute_controller_index = -1;
}
};
VGAScreen.prototype.port3C0_read = function()
{
dbg_log("3C0 read", LOG_VGA);
var result = this.attribute_controller_index;
this.attribute_controller_index = -1;
return result;
};
VGAScreen.prototype.port3C1_read = function()
{
this.attribute_controller_index = -1;
dbg_log("3C1 / attribute controller read " + h(this.attribute_controller_index), LOG_VGA);
return -1;
};
VGAScreen.prototype.port3C2_write = function(value)
{
dbg_log("3C2 / miscellaneous output register = " + h(value), LOG_VGA);
this.miscellaneous_output_register = value;
// cheat way to figure out which video mode is indended to be used
this.switch_video_mode(value);
};
VGAScreen.prototype.port3C4_write = function(value)
{
this.sequencer_index = value;
};
VGAScreen.prototype.port3C4_read = function()
{
return this.sequencer_index;
};
VGAScreen.prototype.port3C5_write = function(value)
{
switch(this.sequencer_index)
{
case 0x02:
//dbg_log("plane write mask: " + h(value), LOG_VGA);
this.plane_write_bm = value;
break;
case 0x04:
dbg_log("sequencer memory mode: " + h(value), LOG_VGA);
this.sequencer_memory_mode = value;
break;
default:
dbg_log("3C5 / sequencer write " + h(this.sequencer_index) + ": " + h(value), LOG_VGA);
}
};
VGAScreen.prototype.port3C5_read = function()
{
switch(this.sequencer_index)
{
case 0x02:
return this.plane_write_bm;
case 0x04:
return this.sequencer_memory_mode;
case 0x06:
return 0x12;
default:
dbg_log("3C5 / sequencer read " + h(this.sequencer_index), LOG_VGA);
}
return 0;
};
VGAScreen.prototype.port3C7_write = function(index)
{
// index for reading the DAC
dbg_log("3C7 write: " + h(index), LOG_VGA);
};
VGAScreen.prototype.port3C8_write = function(index)
{
this.dac_color_index = index * 3;
};
VGAScreen.prototype.port3C9_write = function(color_byte)
{
var index = this.dac_color_index / 3 | 0,
offset = this.dac_color_index % 3,
color = this.vga256_palette[index];
color_byte = color_byte * 255 / 63 & 0xFF;