86Box/src/machine/m_at_compaq.c

/*
 * 86Box	A hypervisor and IBM PC system emulator that specializes in
 *		running old operating systems and software designed for IBM
 *		PC systems and compatibles from 1981 through fairly recent
 *		system designs based on the PCI bus.
 *
 *		This file is part of the 86Box distribution.
 *
 *		Emulation of various Compaq PC's.
 *
 *
 *
 * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
 *		Miran Grca, <mgrca8@gmail.com>
 *		TheCollector1995, <mariogplayer@gmail.com>
 *
 *		Copyright 2008-2018 Sarah Walker.
 *		Copyright 2016-2018 Miran Grca.
 */
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#include <math.h>
#include <86box/86box.h>
#include "cpu.h"
#include <86box/io.h>
#include <86box/timer.h>
#include <86box/pit.h>
#include <86box/mem.h>
#include <86box/rom.h>
#include <86box/device.h>
#include <86box/fdd.h>
#include <86box/fdc.h>
#include <86box/fdc_ext.h>
#include <86box/hdc.h>
#include <86box/hdc_ide.h>
#include <86box/machine.h>
#include <86box/video.h>
#include <86box/vid_cga.h>
#include <86box/vid_cga_comp.h>


enum
{
    COMPAQ_PORTABLEII = 0,
    COMPAQ_PORTABLEIII,
    COMPAQ_PORTABLEIII386,
    COMPAQ_DESKPRO386
};

#define CGA_RGB 0
#define CGA_COMPOSITE 1

#define COMPOSITE_OLD 0
#define COMPOSITE_NEW 1

/*Very rough estimate*/
#define VID_CLOCK (double)(651 * 416 * 60)


/* Mapping of attributes to colours */
static uint32_t 	amber, black;
static uint32_t 	blinkcols[256][2];
static uint32_t 	normcols[256][2];

/* Video options set by the motherboard; they will be picked up by the card
 * on the next poll.
 *
 * Bit  3:   Disable built-in video (for add-on card)
 * Bit  2:   Thin font
 * Bits 0,1: Font set (not currently implemented)
 */
static int8_t cpq_st_display_internal = -1;

static void
compaq_plasma_display_set(uint8_t internal)
{
	cpq_st_display_internal = internal;
}

static uint8_t
compaq_plasma_display_get(void)
{
	return cpq_st_display_internal;
}


typedef struct compaq_plasma_t
{
	mem_mapping_t plasma_mapping;
	cga_t cga;
	uint8_t port_23c6;
	uint8_t	internal_monitor;
	uint8_t	attrmap;	/* Attribute mapping register */
	int linepos, displine;
	uint8_t *vram;
	uint64_t dispontime, dispofftime;
	int dispon;
} compaq_plasma_t;

static uint8_t cga_crtcmask[32] =
{
	0xff, 0xff, 0xff, 0xff, 0x7f, 0x1f, 0x7f, 0x7f, 0xf3, 0x1f, 0x7f, 0x1f, 0x3f, 0xff, 0x3f, 0xff,
	0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};


/* Compaq Deskpro 386 remaps RAM from 0xA0000-0xFFFFF to 0xFA0000-0xFFFFFF */
static mem_mapping_t	ram_mapping;

static void compaq_plasma_recalcattrs(compaq_plasma_t *self);

static void
compaq_plasma_recalctimings(compaq_plasma_t *self)
{
	double _dispontime, _dispofftime, disptime;

	if (!self->internal_monitor && !(self->port_23c6 & 1)) {
		cga_recalctimings(&self->cga);
		return;
	}

	disptime = 651;
	_dispontime = 640;
	_dispofftime = disptime - _dispontime;
	self->dispontime  = (uint64_t)(_dispontime * (cpuclock / VID_CLOCK) * (double)(1ull << 32));
	self->dispofftime = (uint64_t)(_dispofftime * (cpuclock / VID_CLOCK) * (double)(1ull << 32));
}

static void
compaq_plasma_write(uint32_t addr, uint8_t val, void *priv)
{
	compaq_plasma_t *self = (compaq_plasma_t *)priv;

	self->vram[addr & 0x7fff] = val;
}


static uint8_t
compaq_plasma_read(uint32_t addr, void *priv)
{
	compaq_plasma_t *self = (compaq_plasma_t *)priv;
	uint8_t ret;

	ret = (self->vram[addr & 0x7fff]);

	return ret;
}

/* Draw a row of text in 80-column mode */
static void
compaq_plasma_text80(compaq_plasma_t *self)
{
	uint32_t cols[2];
	int x, c;
	uint8_t chr, attr;
	int drawcursor;
	int cursorline;
	int blink;
	uint16_t addr;
	uint8_t sc;
	uint16_t ma = (self->cga.crtc[13] | (self->cga.crtc[12] << 8)) & 0x7fff;
	uint16_t ca = (self->cga.crtc[15] | (self->cga.crtc[14] << 8)) & 0x7fff;

	sc = (self->displine) & 15;
	addr = ((ma & ~1) + (self->displine >> 4) * 80) * 2;
	ma += (self->displine >> 4) * 80;

	if ((self->cga.crtc[10] & 0x60) == 0x20)
		cursorline = 0;
	else
		cursorline = ((self->cga.crtc[10] & 0x0F)*2 <= sc) &&
				((self->cga.crtc[11] & 0x0F)*2 >= sc);

	for (x = 0; x < 80; x++) {
		chr = self->vram[(addr + 2 * x) & 0x7FFF];
		attr = self->vram[(addr + 2 * x + 1) & 0x7FFF];
		drawcursor = ((ma == ca) && cursorline &&
			(self->cga.cgamode & 8) && (self->cga.cgablink & 16));

		blink = ((self->cga.cgablink & 16) && (self->cga.cgamode & 0x20) &&
			(attr & 0x80) && !drawcursor);

		if (self->cga.cgamode & 0x20) { /* Blink */
			cols[1] = blinkcols[attr][1];
			cols[0] = blinkcols[attr][0];
                        if (blink)
				cols[1] = cols[0];
		} else {
			cols[1] = normcols[attr][1];
			cols[0] = normcols[attr][0];
		}
                if (drawcursor) {
                	for (c = 0; c < 8; c++)
                       		((uint32_t *)buffer32->line[self->displine])[(x << 3) + c] = cols[(fontdatm[chr][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (amber ^ black);
		} else {
			for (c = 0; c < 8; c++)
				((uint32_t *)buffer32->line[self->displine])[(x << 3) + c] = cols[(fontdatm[chr][sc] & (1 << (c ^ 7))) ? 1 : 0];
                }
		++ma;
	}
}

/* Draw a row of text in 40-column mode */
static void
compaq_plasma_text40(compaq_plasma_t *self)
{
	uint32_t cols[2];
	int x, c;
	uint8_t chr, attr;
	int drawcursor;
	int cursorline;
	int blink;
	uint16_t addr;
	uint8_t sc;
	uint16_t ma = (self->cga.crtc[13] | (self->cga.crtc[12] << 8)) & 0x7fff;
	uint16_t ca = (self->cga.crtc[15] | (self->cga.crtc[14] << 8)) & 0x7fff;

	sc = (self->displine) & 15;
	addr = ((ma & ~1) + (self->displine >> 4) * 40) * 2;
	ma += (self->displine >> 4) * 40;

	if ((self->cga.crtc[10] & 0x60) == 0x20)
		cursorline = 0;
	else
		cursorline = ((self->cga.crtc[10] & 0x0F)*2 <= sc) &&
				((self->cga.crtc[11] & 0x0F)*2 >= sc);

	for (x = 0; x < 40; x++) {
		chr = self->vram[(addr + 2 * x) & 0x7FFF];
		attr = self->vram[(addr + 2 * x + 1) & 0x7FFF];
		drawcursor = ((ma == ca) && cursorline &&
			(self->cga.cgamode & 8) && (self->cga.cgablink & 16));

		blink = ((self->cga.cgablink & 16) && (self->cga.cgamode & 0x20) &&
			(attr & 0x80) && !drawcursor);

		if (self->cga.cgamode & 0x20) { /* Blink */
			cols[1] = blinkcols[attr][1];
			cols[0] = blinkcols[attr][0];
                        if (blink)
				cols[1] = cols[0];
		} else {
			cols[1] = normcols[attr][1];
			cols[0] = normcols[attr][0];
		}
                if (drawcursor) {
                	for (c = 0; c < 8; c++) {
                       		((uint32_t *)buffer32->line[self->displine])[(x << 4) + c*2] =
                       		((uint32_t *)buffer32->line[self->displine])[(x << 4) + c*2 + 1] = cols[(fontdatm[chr][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (amber ^ black);
			}
		} else {
			for (c = 0; c < 8; c++) {
				((uint32_t *)buffer32->line[self->displine])[(x << 4) + c*2] =
				((uint32_t *)buffer32->line[self->displine])[(x << 4) + c*2+1] = cols[(fontdatm[chr][sc] & (1 << (c ^ 7))) ? 1 : 0];
			}
                }
		++ma;
	}
}


/* Draw a line in CGA 640x200 or Compaq Plasma 640x400 mode */
static void
compaq_plasma_cgaline6(compaq_plasma_t *self)
{
	int x, c;
	uint8_t dat;
	uint32_t ink = 0;
	uint16_t addr;
	uint32_t fg = (self->cga.cgacol & 0x0F) ? amber : black;
	uint32_t bg = black;

	uint16_t ma = (self->cga.crtc[13] | (self->cga.crtc[12] << 8)) & 0x7fff;

	if ((self->cga.crtc[9] == 3) || (self->port_23c6 & 1))	/* 640*400 */ {
		addr = ((self->displine) & 1) * 0x2000 +
			((self->displine >> 1) & 1) * 0x4000 +
			(self->displine >> 2) * 80 +
			((ma & ~1) << 1);
	} else {
		addr = ((self->displine >> 1) & 1) * 0x2000 +
		       (self->displine >> 2) * 80 +
		       ((ma & ~1) << 1);
	}
	for (x = 0; x < 80; x++) {
		dat = self->vram[(addr & 0x7FFF)];
		addr++;

		for (c = 0; c < 8; c++) {
			ink = (dat & 0x80) ? fg : bg;
			if (!(self->cga.cgamode & 8)) ink = black;
			((uint32_t *)buffer32->line[self->displine])[x*8+c] = ink;
			dat <<= 1;
		}
	}
}

/* Draw a line in CGA 320x200 mode. Here the CGA colours are converted to
 * dither patterns: colour 1 to 25% grey, colour 2 to 50% grey */
static void
compaq_plasma_cgaline4(compaq_plasma_t *self)
{
	int x, c;
	uint8_t dat, pattern;
	uint32_t ink0 = 0, ink1 = 0;
	uint16_t addr;

	uint16_t ma = (self->cga.crtc[13] | (self->cga.crtc[12] << 8)) & 0x7fff;

	/* 320*200 */
	addr = ((self->displine >> 1) & 1) * 0x2000 +
		(self->displine >> 2) * 80 +
		((ma & ~1) << 1);

	for (x = 0; x < 80; x++) {
		dat = self->vram[(addr & 0x7FFF)];
		addr++;

		for (c = 0; c < 4; c++) {
			pattern = (dat & 0xC0) >> 6;
			if (!(self->cga.cgamode & 8))
				pattern = 0;

			switch (pattern & 3) {
				case 0: ink0 = ink1 = black; break;
				case 1: if (self->displine & 1)  {
						ink0 = black; ink1 = black;
					} else {
						ink0 = amber; ink1 = black;
					}
					break;
				case 2: if (self->displine & 1)  {
						ink0 = black; ink1 = amber;
					} else {
						ink0 = amber; ink1 = black;
					}
					break;
				case 3: ink0 = ink1 = amber; break;

			}
			((uint32_t *)buffer32->line[self->displine])[x*8+2*c] = ink0;
			((uint32_t *)buffer32->line[self->displine])[x*8+2*c+1] = ink1;
			dat <<= 2;
		}
	}
}

static void
compaq_plasma_out(uint16_t addr, uint8_t val, void *priv)
{
	compaq_plasma_t *self = (compaq_plasma_t *)priv;
	uint8_t old;

	switch (addr) {
	/* Emulated CRTC, register select */
	case 0x3d4:
		self->cga.crtcreg = val & 31;
		break;

	/* Emulated CRTC, value */
	case 0x3d5:
		old = self->cga.crtc[self->cga.crtcreg];
		self->cga.crtc[self->cga.crtcreg] = val & cga_crtcmask[self->cga.crtcreg];

		/* Register 0x12 controls the attribute mappings for the
		* plasma screen. */
		if (self->cga.crtcreg == 0x12)  {
			self->attrmap = val;
			compaq_plasma_recalcattrs(self);
			break;
		}

		if (old != val) {
			if (self->cga.crtcreg < 0xe || self->cga.crtcreg > 0x10) {
				fullchange = changeframecount;
				compaq_plasma_recalctimings(self);
			}
		}
		break;

	case 0x3d8:
		self->cga.cgamode = val;
		break;

	case 0x3d9:
		self->cga.cgacol = val;
		break;

	case 0x13c6:
		if (val & 8)
			compaq_plasma_display_set(1);
		else
			compaq_plasma_display_set(0);
		break;

	case 0x23c6:
		self->port_23c6 = val;
		if (val & 8) /* Disable internal CGA */
			mem_mapping_disable(&self->plasma_mapping);
		else
			mem_mapping_enable(&self->plasma_mapping);
		break;
	}
}


static uint8_t
compaq_plasma_in(uint16_t addr, void *priv)
{
	compaq_plasma_t *self = (compaq_plasma_t *)priv;
	uint8_t ret = 0xff;

	switch (addr) {
	case 0x3d4:
		ret = self->cga.crtcreg;
		break;

	case 0x3d5:
		if (self->cga.crtcreg == 0x12) {
			ret = self->attrmap & 0x0F;
			if (self->internal_monitor)
				ret |= 0x30; /* Plasma / CRT */
		} else
			ret = self->cga.crtc[self->cga.crtcreg];
		break;

	case 0x3da:
		ret = self->cga.cgastat;
		break;

	case 0x13c6:
		if (compaq_plasma_display_get())
			ret = 8;
		else
			ret = 0;
		break;

	case 0x23c6:
		ret = self->port_23c6;
		break;
	}

	return ret;
}

static void
compaq_plasma_poll(void *p)
{
	compaq_plasma_t *self = (compaq_plasma_t *)p;

	/* Switch between internal plasma and external CRT display. */
	if (cpq_st_display_internal != -1 && cpq_st_display_internal != self->internal_monitor) {
		self->internal_monitor = cpq_st_display_internal;
		compaq_plasma_recalctimings(self);
	}

	if (!self->internal_monitor && !(self->port_23c6 & 1)) {
		cga_poll(&self->cga);
		return;
	}

	if (!self->linepos) {
		timer_advance_u64(&self->cga.timer, self->dispofftime);
		self->cga.cgastat |= 1;
		self->linepos = 1;
                if (self->dispon) {
			if (self->displine == 0)
                                video_wait_for_buffer();

			/* Graphics */
			if (self->cga.cgamode & 0x02)	 {
				if (self->cga.cgamode & 0x10)
					compaq_plasma_cgaline6(self);
				else
					compaq_plasma_cgaline4(self);
			}
			else if (self->cga.cgamode & 0x01) /* High-res text */
				compaq_plasma_text80(self);
			else
				compaq_plasma_text40(self);
		}
		self->displine++;
		/* Hardcode a fixed refresh rate and VSYNC timing */
		if (self->displine == 400) { /* Start of VSYNC */
                        self->cga.cgastat |= 8;
			self->dispon = 0;
		}
		if (self->displine == 416) { /* End of VSYNC */
			self->displine = 0;
			self->cga.cgastat &= ~8;
			self->dispon = 1;
		}
	} else {
		if (self->dispon)
			self->cga.cgastat &= ~1;

		timer_advance_u64(&self->cga.timer, self->dispontime);
		self->linepos = 0;

		if (self->displine == 400) {
			/* Hardcode 640x400 window size */
			if ((640 != xsize) || (400 != ysize) || video_force_resize_get()) {
				xsize = 640;
				ysize = 400;
				if (xsize < 64)
					xsize = 656;
                                if (ysize < 32)
					ysize = 200;
				set_screen_size(xsize, ysize);

				if (video_force_resize_get())
					video_force_resize_set(0);
                        }
			video_blit_memtoscreen(0, 0, xsize, ysize);
			frames++;

			/* Fixed 640x400 resolution */
			video_res_x = 640;
			video_res_y = 400;

			if (self->cga.cgamode & 0x02) {
				if (self->cga.cgamode & 0x10)
					video_bpp = 1;
				else
					video_bpp = 2;

			} else
				video_bpp = 0;
			self->cga.cgablink++;
                }
        }
}

static void
compaq_plasma_recalcattrs(compaq_plasma_t *self)
{
	int n;

	/* val behaves as follows:
	 *     Bit 0: Attributes 01-06, 08-0E are inverse video
	 *     Bit 1: Attributes 01-06, 08-0E are bold
	 *     Bit 2: Attributes 11-16, 18-1F, 21-26, 28-2F ... F1-F6, F8-FF
	 * 	      are inverse video
	 *     Bit 3: Attributes 11-16, 18-1F, 21-26, 28-2F ... F1-F6, F8-FF
	 * 	      are bold */

	/* Set up colours */
	amber = makecol(0xff, 0x7D, 0x00);
	black = makecol(0x64, 0x19, 0x00);

	/* Initialise the attribute mapping. Start by defaulting everything
	 * to black on amber, and with bold set by bit 3 */
	for (n = 0; n < 256; n++) {
		blinkcols[n][0] = normcols[n][0] = amber;
		blinkcols[n][1] = normcols[n][1] = black;
	}

	/* Colours 0x11-0xFF are controlled by bits 2 and 3 of the
	 * passed value. Exclude x0 and x8, which are always black on
	 * amber. */
	for (n = 0x11; n <= 0xFF; n++) {
		if ((n & 7) == 0)
			continue;
		if (self->attrmap & 4) { /* Inverse */
			blinkcols[n][0] = normcols[n][0] = amber;
			blinkcols[n][1] = normcols[n][1] = black;
		} else { /* Normal */
			blinkcols[n][0] = normcols[n][0] = black;
			blinkcols[n][1] = normcols[n][1] = amber;
		}
	}
	/* Set up the 01-0E range, controlled by bits 0 and 1 of the
	 * passed value. When blinking is enabled this also affects 81-8E. */
	for (n = 0x01; n <= 0x0E; n++) {
		if (n == 7)
			continue;
		if (self->attrmap & 1) {
			blinkcols[n][0] = normcols[n][0] = amber;
			blinkcols[n][1] = normcols[n][1] = black;
			blinkcols[n+128][0] = amber;
			blinkcols[n+128][1] = black;
		} else {
			blinkcols[n][0] = normcols[n][0] = black;
			blinkcols[n][1] = normcols[n][1] = amber;
			blinkcols[n+128][0] = black;
			blinkcols[n+128][1] = amber;
		}
	}
	/* Colours 07 and 0F are always amber on black. If blinking is
	 * enabled so are 87 and 8F. */
	for (n = 0x07; n <= 0x0F; n += 8) {
		blinkcols[n][0] = normcols[n][0] = black;
		blinkcols[n][1] = normcols[n][1] = amber;
		blinkcols[n+128][0] = black;
		blinkcols[n+128][1] = amber;
	}
	/* When not blinking, colours 81-8F are always amber on black. */
	for (n = 0x81; n <= 0x8F; n ++) {
		normcols[n][0] = black;
		normcols[n][1] = amber;
	}

	/* Finally do the ones which are solid black. These differ between
	 * the normal and blinking mappings */
	for (n = 0; n <= 0xFF; n += 0x11)
		normcols[n][0] = normcols[n][1] = black;

	/* In the blinking range, 00 11 22 .. 77 and 80 91 A2 .. F7 are black */
	for (n = 0; n <= 0x77; n += 0x11) {
		blinkcols[n][0] = blinkcols[n][1] = black;
		blinkcols[n+128][0] = blinkcols[n+128][1] = black;
	}
}

static void *
compaq_plasma_init(const device_t *info)
{
	int display_type;
	compaq_plasma_t *self = malloc(sizeof(compaq_plasma_t));
	memset(self, 0, sizeof(compaq_plasma_t));

	display_type = device_get_config_int("display_type");
	self->cga.composite = (display_type != CGA_RGB);
	self->cga.revision = device_get_config_int("composite_type");

	self->vram = malloc(0x8000);
	self->internal_monitor = 1;

	cga_comp_init(self->cga.revision);
	timer_add(&self->cga.timer, compaq_plasma_poll, self, 1);
	mem_mapping_add(&self->plasma_mapping, 0xb8000, 0x08000, compaq_plasma_read, NULL, NULL, compaq_plasma_write, NULL, NULL, NULL /*self->cga.vram*/, MEM_MAPPING_EXTERNAL, self);
	io_sethandler(0x03d0, 0x0010, compaq_plasma_in, NULL, NULL, compaq_plasma_out, NULL, NULL, self);
	io_sethandler(0x13c6, 0x0001, compaq_plasma_in, NULL, NULL, compaq_plasma_out, NULL, NULL, self);
	io_sethandler(0x23c6, 0x0001, compaq_plasma_in, NULL, NULL, compaq_plasma_out, NULL, NULL, self);

	/* Default attribute mapping is 4 */
	self->attrmap = 4;
	compaq_plasma_recalcattrs(self);

	self->cga.cgastat = 0xF4;
	self->cga.vram = self->vram;

	overscan_x = overscan_y = 16;

	self->cga.rgb_type = device_get_config_int("rgb_type");
	cga_palette = (self->cga.rgb_type << 1);
	cgapal_rebuild();

	return self;
}

static void
compaq_plasma_close(void *p)
{
	compaq_plasma_t *self = (compaq_plasma_t *)p;

	free(self->vram);

	free(self);
}

static void
compaq_plasma_speed_changed(void *p)
{
	compaq_plasma_t *self = (compaq_plasma_t *)p;

	compaq_plasma_recalctimings(self);
}

const device_config_t compaq_plasma_config[] = {
    {
        .name = "display_type",
        .description = "Display type",
        .type = CONFIG_SELECTION,
        .default_string = "",
        .default_int = CGA_RGB,
        .file_filter = "",
        .spinner = { 0 },
        .selection = {
            { .description = "RGB",       .value = CGA_RGB       },
            { .description = "Composite", .value = CGA_COMPOSITE },
            { .description = ""                                  }
        }
    },
    {
        .name = "composite_type",
        .description = "Composite type",
        .type = CONFIG_SELECTION,
        .default_string = "",
        .default_int = COMPOSITE_OLD,
        .file_filter = "",
        .spinner = { 0 },
        {
            { .description = "Old", .value = COMPOSITE_OLD },
            { .description = "New", .value = COMPOSITE_NEW },
            { .description = ""                            }
        }
    },
    {
        .name = "rgb_type",
		.description = "RGB type",
		.type = CONFIG_SELECTION,
        .default_string = "",
        .default_int = 0,
        .file_filter = "",
        .spinner = { 0 },
        .selection = {
            { .description = "Color",            .value = 0 },
            { .description = "Green Monochrome", .value = 1 },
            { .description = "Amber Monochrome", .value = 2 },
            { .description = "Gray Monochrome",  .value = 3 },
            { .description = "Color (no brown)", .value = 4 },
            { .description = ""                             }
        }
    },
    { .name = "", .description = "", .type = -1 }
};

static const device_t compaq_plasma_device = {
    .name = "Compaq Plasma",
    .internal_name = "compaq_plasma",
    .flags = 0,
    .local = 0,
    .init = compaq_plasma_init,
    .close = compaq_plasma_close,
    .reset = NULL,
    { .available = NULL },
    .speed_changed = compaq_plasma_speed_changed,
    .force_redraw = NULL,
    .config = compaq_plasma_config
};

static uint8_t
read_ram(uint32_t addr, void *priv)
{
    addr = (addr & 0x7ffff) + 0x80000;
    addreadlookup(mem_logical_addr, addr);

    return(ram[addr]);
}


static uint16_t
read_ramw(uint32_t addr, void *priv)
{
    addr = (addr & 0x7ffff) + 0x80000;
    addreadlookup(mem_logical_addr, addr);

    return(*(uint16_t *)&ram[addr]);
}


static uint32_t
read_raml(uint32_t addr, void *priv)
{
    addr = (addr & 0x7ffff) + 0x80000;
    addreadlookup(mem_logical_addr, addr);

    return(*(uint32_t *)&ram[addr]);
}


static void
write_ram(uint32_t addr, uint8_t val, void *priv)
{
    addr = (addr & 0x7ffff) + 0x80000;
    addwritelookup(mem_logical_addr, addr);

    mem_write_ramb_page(addr, val, &pages[addr >> 12]);
}


static void
write_ramw(uint32_t addr, uint16_t val, void *priv)
{
    addr = (addr & 0x7ffff) + 0x80000;
    addwritelookup(mem_logical_addr, addr);

    mem_write_ramw_page(addr, val, &pages[addr >> 12]);
}


static void
write_raml(uint32_t addr, uint32_t val, void *priv)
{
    addr = (addr & 0x7ffff) + 0x80000;
    addwritelookup(mem_logical_addr, addr);

    mem_write_raml_page(addr, val, &pages[addr >> 12]);
}

const device_t *
at_cpqiii_get_device(void)
{
	return &compaq_plasma_device;
}

static void
machine_at_compaq_init(const machine_t *model, int type)
{
    if (type != COMPAQ_DESKPRO386)
	mem_remap_top(384);

    if (fdc_type == FDC_INTERNAL)
	device_add(&fdc_at_device);

    mem_mapping_add(&ram_mapping, 0xfa0000, 0x60000,
                    read_ram, read_ramw, read_raml,
                    write_ram, write_ramw, write_raml,
                    0xa0000+ram, MEM_MAPPING_INTERNAL, NULL);

    video_reset(gfxcard);

    switch(type) {
	case COMPAQ_PORTABLEII:
		break;

	case COMPAQ_PORTABLEIII:
		if (gfxcard == VID_INTERNAL)
			device_add(&compaq_plasma_device);
		break;

	case COMPAQ_PORTABLEIII386:
		if (hdc_current == 1)
			device_add(&ide_isa_device);
		if (gfxcard == VID_INTERNAL)
			device_add(&compaq_plasma_device);
		break;

	case COMPAQ_DESKPRO386:
		if (hdc_current == 1)
			device_add(&ide_isa_device);
		break;
    }

    machine_at_init(model);
}


int
machine_at_portableii_init(const machine_t *model)
{
    int ret;

    ret = bios_load_interleavedr("roms/machines/portableii/109740-001.rom",
				"roms/machines/portableii/109739-001.rom",
				0x000f8000, 65536, 0);

    if (bios_only || !ret)
	return ret;

    machine_at_compaq_init(model, COMPAQ_PORTABLEII);

    return ret;
}


int
machine_at_portableiii_init(const machine_t *model)
{
    int ret;

    ret = bios_load_interleavedr("roms/machines/portableiii/Compaq Portable III - BIOS - 106779-002 - Even.bin",
				"roms/machines/portableiii/Compaq Portable III - BIOS - 106778-002 - Odd.bin",
				0x000f8000, 65536, 0);

    if (bios_only || !ret)
	return ret;

    machine_at_compaq_init(model, COMPAQ_PORTABLEIII);

    return ret;
}


int
machine_at_portableiii386_init(const machine_t *model)
{
    int ret;

    ret = bios_load_interleavedr("roms/machines/portableiii/Compaq Portable III - BIOS - 106779-002 - Even.bin",
				"roms/machines/portableiii/Compaq Portable III - BIOS - 106778-002 - Odd.bin",
				0x000f8000, 65536, 0);

    if (bios_only || !ret)
	return ret;

    machine_at_compaq_init(model, COMPAQ_PORTABLEIII386);

    return ret;
}