/*
* 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.
*
* Wyse-700 emulation.
*
*
*
* Authors: Sarah Walker,
* Miran Grca,
*
* Copyright 2008-2018 Sarah Walker.
* Copyright 2016-2018 Miran Grca.
*/
#include
#include
#include
#include
#include
#include <86box/86box.h>
#include <86box/io.h>
#include <86box/timer.h>
#include <86box/pit.h>
#include <86box/mem.h>
#include <86box/device.h>
#include <86box/video.h>
#include <86box/plat_unused.h>
#define WY700_XSIZE 1280
#define WY700_YSIZE 800
void updatewindowsize(int x, int y);
/* The Wyse 700 is an unusual video card. Though it has an MC6845 CRTC, this
* is not exposed directly to the host PC. Instead, the CRTC is controlled by
* an MC68705P3 microcontroller.
*
* Rather than emulate the real CRTC, I'm writing this as more or less a
* fixed-frequency card with a 1280x800 display, and scaling its selection
* of modes to that window.
*
* By default, the card responds to both the CGA and MDA I/O and memory
* ranges. Either range can be disabled by means of jumpers; this allows
* the Wy700 to coexist with a CGA or MDA.
*
* wy700->wy700_mode indicates which of the supported video modes is in use:
*
* 0x00: 40x 25 text (CGA compatible) [32x32 character cell]
* 0x02: 80x 25 text (CGA / MDA compatible) [16x32 character cell]
* 0x04: 320x200x4 graphics (CGA compatible)
* 0x06: 640x200x2 graphics (CGA compatible)
* 0x80: 640x400x2 graphics
* 0x90: 320x400x4 graphics
* 0xA0: 1280x400x2 graphics
* 0xB0: 640x400x4 graphics
* 0xC0: 1280x800x2 graphics (interleaved)
* 0xD0: 640x800x4 graphics (interleaved)
* In hi-res graphics modes, bit 3 of the mode byte is the enable flag.
*
*/
/* What works (or appears to) :
* MDA/CGA 80x25 text mode
* CGA 40x25 text mode
* CGA 640x200 graphics mode
* CGA 320x200 graphics mode
* Hi-res graphics modes
* Font selection
* Display enable / disable
* -- via Wy700 mode register (in hi-res modes)
* -- via Wy700 command register (in text & CGA modes)
* -- via CGA/MDA control register (in text & CGA modes)
*
* What doesn't work, is untested or not well understood:
* - Cursor detach (commands 4 and 5)
*/
/* The microcontroller sets up the real CRTC with one of five fixed mode
* definitions. As written, this is a fairly simplistic emulation that
* doesn't attempt to closely follow the actual working of the CRTC; but I've
* included the definitions here for information. */
static uint8_t mode_1280x800[] = {
0x31, /* Horizontal total */
0x28, /* Horizontal displayed */
0x29, /* Horizontal sync position */
0x06, /* Horizontal sync width */
0x1b, /* Vertical total */
0x00, /* Vertical total adjust */
0x19, /* Vertical displayed */
0x1a, /* Vsync position */
0x03, /* Interlace and skew */
0x0f, /* Maximum raster address */
};
static uint8_t mode_1280x400[] = {
0x31, /* Horizontal total */
0x28, /* Horizontal displayed */
0x29, /* Horizontal sync position */
0x06, /* Horizontal sync width */
0x1b, /* Vertical total */
0x00, /* Vertical total adjust */
0x19, /* Vertical displayed */
0x1a, /* Vsync position */
0x01, /* Interlace and skew */
0x0f, /* Maximum raster address */
};
static uint8_t mode_640x400[] = {
0x18, /* Horizontal total */
0x14, /* Horizontal displayed */
0x14, /* Horizontal sync position */
0x03, /* Horizontal sync width */
0x1b, /* Vertical total */
0x00, /* Vertical total adjust */
0x19, /* Vertical displayed */
0x1a, /* Vsync position */
0x01, /* Interlace and skew */
0x0f, /* Maximum raster address */
};
static uint8_t mode_640x200[] = {
0x18, /* Horizontal total */
0x14, /* Horizontal displayed */
0x14, /* Horizontal sync position */
0xff, /* Horizontal sync width */
0x37, /* Vertical total */
0x00, /* Vertical total adjust */
0x32, /* Vertical displayed */
0x34, /* Vsync position */
0x03, /* Interlace and skew */
0x07, /* Maximum raster address */
};
static uint8_t mode_80x24[] = {
0x31, /* Horizontal total */
0x28, /* Horizontal displayed */
0x2A, /* Horizontal sync position */
0xff, /* Horizontal sync width */
0x1b, /* Vertical total */
0x00, /* Vertical total adjust */
0x19, /* Vertical displayed */
0x1a, /* Vsync position */
0x01, /* Interlace and skew */
0x0f, /* Maximum raster address */
};
static uint8_t mode_40x24[] = {
0x18, /* Horizontal total */
0x14, /* Horizontal displayed */
0x15, /* Horizontal sync position */
0xff, /* Horizontal sync width */
0x1b, /* Vertical total */
0x00, /* Vertical total adjust */
0x19, /* Vertical displayed */
0x1a, /* Vsync position */
0x01, /* Interlace and skew */
0x0f, /* Maximum raster address */
};
/* Font ROM: Two fonts, each containing 256 characters, 16x16 pixels */
extern uint8_t fontdatw[512][32];
typedef struct wy700_t {
mem_mapping_t mapping;
/* The microcontroller works by watching four ports:
* 0x3D8 / 0x3B8 (mode control register)
* 0x3DD (top scanline address)
* 0x3DF (Wy700 control register)
* CRTC reg 14 (cursor location high)
*
* It will do nothing until one of these registers is touched. When
* one is, it then reconfigures the internal 6845 based on what it
* sees.
*/
uint8_t last_03D8; /* Copies of values written to the listed */
uint8_t last_03DD; /* I/O ports */
uint8_t last_03DF;
uint8_t last_crtc_0E;
uint8_t cga_crtc[32]; /* The 'CRTC' as the host PC sees it */
uint8_t real_crtc[32]; /* The internal CRTC as the microcontroller */
/* sees it */
int cga_crtcreg; /* Current CRTC register */
uint16_t wy700_base; /* Framebuffer base address (native modes) */
uint8_t wy700_control; /* Native control / command register */
uint8_t wy700_mode; /* Current mode (see list at top of file) */
uint8_t cga_ctrl; /* Emulated MDA/CGA control register */
uint8_t cga_colour; /* Emulated CGA colour register (ignored) */
uint8_t mda_stat; /* MDA status (IN 0x3BA) */
uint8_t cga_stat; /* CGA status (IN 0x3DA) */
int font; /* Current font, 0 or 1 */
int enabled; /* Display enabled, 0 or 1 */
int detach; /* Detach cursor, 0 or 1 */
uint64_t dispontime, dispofftime;
pc_timer_t timer;
int linepos, displine;
int vc;
int dispon, blink;
int vsynctime;
uint8_t *vram;
} wy700_t;
/* Mapping of attributes to colours, in CGA emulation... */
static int cgacols[256][2][2];
/* ... and MDA emulation. */
static int mdacols[256][2][2];
void wy700_recalctimings(wy700_t *wy700);
void wy700_write(uint32_t addr, uint8_t val, void *priv);
uint8_t wy700_read(uint32_t addr, void *priv);
void wy700_checkchanges(wy700_t *wy700);
static video_timings_t timing_wy700 = { .type = VIDEO_ISA, .write_b = 8, .write_w = 16, .write_l = 32, .read_b = 8, .read_w = 16, .read_l = 32 };
void
wy700_out(uint16_t addr, uint8_t val, void *priv)
{
wy700_t *wy700 = (wy700_t *) priv;
switch (addr) {
/* These three registers are only mapped in the 3Dx range,
* not the 3Bx range. */
case 0x3DD: /* Base address (low) */
wy700->wy700_base &= 0xFF00;
wy700->wy700_base |= val;
wy700_checkchanges(wy700);
break;
case 0x3DE: /* Base address (high) */
wy700->wy700_base &= 0xFF;
wy700->wy700_base |= ((uint16_t) val) << 8;
wy700_checkchanges(wy700);
break;
case 0x3DF: /* Command / control register */
wy700->wy700_control = val;
wy700_checkchanges(wy700);
break;
/* Emulated CRTC, register select */
case 0x3b0:
case 0x3b2:
case 0x3b4:
case 0x3b6:
case 0x3d0:
case 0x3d2:
case 0x3d4:
case 0x3d6:
wy700->cga_crtcreg = val & 31;
break;
/* Emulated CRTC, value */
case 0x3b1:
case 0x3b3:
case 0x3b5:
case 0x3b7:
case 0x3d1:
case 0x3d3:
case 0x3d5:
case 0x3d7:
wy700->cga_crtc[wy700->cga_crtcreg] = val;
wy700_checkchanges(wy700);
wy700_recalctimings(wy700);
return;
/* Emulated MDA / CGA control register */
case 0x3b8:
case 0x3D8:
wy700->cga_ctrl = val;
wy700_checkchanges(wy700);
return;
/* Emulated CGA colour register */
case 0x3D9:
wy700->cga_colour = val;
return;
default:
break;
}
}
uint8_t
wy700_in(uint16_t addr, void *priv)
{
const wy700_t *wy700 = (wy700_t *) priv;
switch (addr) {
case 0x3b0:
case 0x3b2:
case 0x3b4:
case 0x3b6:
case 0x3d0:
case 0x3d2:
case 0x3d4:
case 0x3d6:
return wy700->cga_crtcreg;
case 0x3b1:
case 0x3b3:
case 0x3b5:
case 0x3b7:
case 0x3d1:
case 0x3d3:
case 0x3d5:
case 0x3d7:
return wy700->cga_crtc[wy700->cga_crtcreg];
case 0x3b8:
case 0x3d8:
return wy700->cga_ctrl;
case 0x3d9:
return wy700->cga_colour;
case 0x3ba:
return wy700->mda_stat;
case 0x3da:
return wy700->cga_stat;
default:
break;
}
return 0xff;
}
/* Check if any of the four key registers has changed. If so, check for a
* mode change or cursor size change */
void
wy700_checkchanges(wy700_t *wy700)
{
uint8_t curstart;
uint8_t curend;
if (wy700->last_03D8 == wy700->cga_ctrl && wy700->last_03DD == (wy700->wy700_base & 0xFF) && wy700->last_03DF == wy700->wy700_control && wy700->last_crtc_0E == wy700->cga_crtc[0x0E]) {
return; /* Nothing changed */
}
/* Check for control register changes */
if (wy700->last_03DF != wy700->wy700_control) {
wy700->last_03DF = wy700->wy700_control;
/* Values 1-7 are commands. */
switch (wy700->wy700_control) {
case 1: /* Reset */
wy700->font = 0;
wy700->enabled = 1;
wy700->detach = 0;
break;
case 2: /* Font 1 */
wy700->font = 0;
break;
case 3: /* Font 2 */
wy700->font = 1;
break;
/* Even with the microprogram from an original card, I can't really work out
* what commands 4 and 5 (which I've called 'cursor detach' / 'cursor attach')
* do. Command 4 sets a flag in microcontroller RAM, and command 5 clears
* it. When the flag is set, the real cursor doesn't track the cursor in the
* emulated CRTC, and its blink rate increases. Possibly it's a self-test
* function of some kind.
*
* The card documentation doesn't cover these commands.
*/
case 4: /* Detach cursor */
wy700->detach = 1;
break;
case 5: /* Attach cursor */
wy700->detach = 0;
break;
case 6: /* Disable display */
wy700->enabled = 0;
break;
case 7: /* Enable display */
wy700->enabled = 1;
break;
default:
break;
}
/* A control write with the top bit set selects graphics mode */
if (wy700->wy700_control & 0x80) {
/* Select hi-res graphics mode; map framebuffer at A0000 */
mem_mapping_set_addr(&wy700->mapping, 0xa0000, 0x20000);
wy700->wy700_mode = wy700->wy700_control;
/* Select appropriate preset timings */
if (wy700->wy700_mode & 0x40) {
memcpy(wy700->real_crtc, mode_1280x800,
sizeof(mode_1280x800));
} else if (wy700->wy700_mode & 0x20) {
memcpy(wy700->real_crtc, mode_1280x400,
sizeof(mode_1280x400));
} else {
memcpy(wy700->real_crtc, mode_640x400,
sizeof(mode_640x400));
}
}
}
/* An attempt to program the CGA / MDA selects low-res mode */
else if (wy700->last_03D8 != wy700->cga_ctrl) {
wy700->last_03D8 = wy700->cga_ctrl;
/* Set lo-res text or graphics mode.
* (Strictly speaking, when not in hi-res mode the card
* should be mapped at B0000-B3FFF and B8000-BBFFF, leaving
* a 16k hole between the two ranges) */
mem_mapping_set_addr(&wy700->mapping, 0xb0000, 0x0C000);
if (wy700->cga_ctrl & 2) /* Graphics mode */
{
wy700->wy700_mode = (wy700->cga_ctrl & 0x10) ? 6 : 4;
memcpy(wy700->real_crtc, mode_640x200,
sizeof(mode_640x200));
} else if (wy700->cga_ctrl & 1) /* Text mode 80x24 */
{
wy700->wy700_mode = 2;
memcpy(wy700->real_crtc, mode_80x24, sizeof(mode_80x24));
} else /* Text mode 40x24 */
{
wy700->wy700_mode = 0;
memcpy(wy700->real_crtc, mode_40x24, sizeof(mode_40x24));
}
}
/* Convert the cursor sizes from the ones used by the CGA or MDA
* to native */
if (wy700->cga_crtc[9] == 13) /* MDA scaling */
{
curstart = wy700->cga_crtc[10] & 0x1F;
wy700->real_crtc[10] = ((curstart + 5) >> 3) + curstart;
if (wy700->real_crtc[10] > 31)
wy700->real_crtc[10] = 31;
/* And bring 'cursor disabled' flag across */
if ((wy700->cga_crtc[10] & 0x60) == 0x20) {
wy700->real_crtc[10] |= 0x20;
}
curend = wy700->cga_crtc[11] & 0x1F;
wy700->real_crtc[11] = ((curend + 5) >> 3) + curend;
if (wy700->real_crtc[11] > 31)
wy700->real_crtc[11] = 31;
} else /* CGA scaling */
{
curstart = wy700->cga_crtc[10] & 0x1F;
wy700->real_crtc[10] = curstart << 1;
if (wy700->real_crtc[10] > 31)
wy700->real_crtc[10] = 31;
/* And bring 'cursor disabled' flag across */
if ((wy700->cga_crtc[10] & 0x60) == 0x20) {
wy700->real_crtc[10] |= 0x20;
}
curend = wy700->cga_crtc[11] & 0x1F;
wy700->real_crtc[11] = curend << 1;
if (wy700->real_crtc[11] > 31)
wy700->real_crtc[11] = 31;
}
}
void
wy700_write(uint32_t addr, uint8_t val, void *priv)
{
wy700_t *wy700 = (wy700_t *) priv;
if (wy700->wy700_mode & 0x80) /* High-res mode. */
{
addr &= 0xFFFF;
/* In 800-line modes, bit 1 of the control register sets the high bit of the
* write address. */
if ((wy700->wy700_mode & 0x42) == 0x42) {
addr |= 0x10000;
}
wy700->vram[addr] = val;
} else {
wy700->vram[addr & 0x3fff] = val;
}
}
uint8_t
wy700_read(uint32_t addr, void *priv)
{
const wy700_t *wy700 = (wy700_t *) priv;
if (wy700->wy700_mode & 0x80) { /* High-res mode. */
addr &= 0xFFFF;
/* In 800-line modes, bit 0 of the control register sets the high bit of the
* read address. */
if ((wy700->wy700_mode & 0x41) == 0x41) {
addr |= 0x10000;
}
return wy700->vram[addr];
} else {
return wy700->vram[addr & 0x3fff];
}
}
void
wy700_recalctimings(wy700_t *wy700)
{
double disptime;
double _dispontime;
double _dispofftime;
disptime = wy700->real_crtc[0] + 1;
_dispontime = wy700->real_crtc[1];
_dispofftime = disptime - _dispontime;
_dispontime *= MDACONST;
_dispofftime *= MDACONST;
wy700->dispontime = (uint64_t) (_dispontime);
wy700->dispofftime = (uint64_t) (_dispofftime);
}
/* Draw a single line of the screen in either text mode */
void
wy700_textline(wy700_t *wy700)
{
int w = (wy700->wy700_mode == 0) ? 40 : 80;
int cw = (wy700->wy700_mode == 0) ? 32 : 16;
uint8_t chr;
uint8_t attr;
uint8_t bitmap[2];
const uint8_t *fontbase = &fontdatw[0][0];
int blink;
int c;
int drawcursor;
int cursorline;
int mda = 0;
uint16_t addr;
uint8_t sc;
uint16_t ma = (wy700->cga_crtc[13] | (wy700->cga_crtc[12] << 8)) & 0x3fff;
uint16_t ca = (wy700->cga_crtc[15] | (wy700->cga_crtc[14] << 8)) & 0x3fff;
/* The fake CRTC character height register selects whether MDA or CGA
* attributes are used */
if (wy700->cga_crtc[9] == 0 || wy700->cga_crtc[9] == 13) {
mda = 1;
}
if (wy700->font) {
fontbase += 256 * 32;
}
addr = ((ma & ~1) + (wy700->displine >> 5) * w) * 2;
sc = (wy700->displine >> 1) & 15;
ma += ((wy700->displine >> 5) * w);
if ((wy700->real_crtc[10] & 0x60) == 0x20) {
cursorline = 0;
} else {
cursorline = ((wy700->real_crtc[10] & 0x1F) <= sc) && ((wy700->real_crtc[11] & 0x1F) >= sc);
}
for (int x = 0; x < w; x++) {
chr = wy700->vram[(addr + 2 * x) & 0x3FFF];
attr = wy700->vram[(addr + 2 * x + 1) & 0x3FFF];
drawcursor = ((ma == ca) && cursorline && wy700->enabled && (wy700->cga_ctrl & 8) && (wy700->blink & 16));
blink = ((wy700->blink & 16) && (wy700->cga_ctrl & 0x20) && (attr & 0x80) && !drawcursor);
if (wy700->cga_ctrl & 0x20)
attr &= 0x7F;
/* MDA underline */
if (sc == 14 && mda && ((attr & 7) == 1)) {
for (c = 0; c < cw; c++)
buffer32->line[wy700->displine][(x * cw) + c] = mdacols[attr][blink][1];
} else /* Draw 16 pixels of character */
{
bitmap[0] = fontbase[chr * 32 + 2 * sc];
bitmap[1] = fontbase[chr * 32 + 2 * sc + 1];
for (c = 0; c < 16; c++) {
int col;
if (c < 8)
col = (mda ? mdacols : cgacols)[attr][blink][(bitmap[0] & (1 << (c ^ 7))) ? 1 : 0];
else
col = (mda ? mdacols : cgacols)[attr][blink][(bitmap[1] & (1 << ((c & 7) ^ 7))) ? 1 : 0];
if (!(wy700->enabled) || !(wy700->cga_ctrl & 8))
col = mdacols[0][0][0];
if (w == 40) {
buffer32->line[wy700->displine][(x * cw) + 2 * c] = col;
buffer32->line[wy700->displine][(x * cw) + 2 * c + 1] = col;
} else
buffer32->line[wy700->displine][(x * cw) + c] = col;
}
if (drawcursor) {
for (c = 0; c < cw; c++)
buffer32->line[wy700->displine][(x * cw) + c] ^= (mda ? mdacols : cgacols)[attr][0][1];
}
++ma;
}
}
}
/* Draw a line in either of the CGA graphics modes (320x200 or 640x200) */
void
wy700_cgaline(wy700_t *wy700)
{
int c;
uint32_t dat;
uint8_t ink = 0;
uint16_t addr;
uint16_t ma = (wy700->cga_crtc[13] | (wy700->cga_crtc[12] << 8)) & 0x3fff;
addr = ((wy700->displine >> 2) & 1) * 0x2000 + (wy700->displine >> 3) * 80 + ((ma & ~1) << 1);
/* The fixed mode setting here programs the real CRTC with a screen
* width to 20, so draw in 20 fixed chunks of 4 bytes each */
for (uint8_t x = 0; x < 20; x++) {
dat = ((wy700->vram[addr & 0x3FFF] << 24) | (wy700->vram[(addr + 1) & 0x3FFF] << 16) | (wy700->vram[(addr + 2) & 0x3FFF] << 8) | (wy700->vram[(addr + 3) & 0x3FFF]));
addr += 4;
if (wy700->wy700_mode == 6) {
for (c = 0; c < 32; c++) {
ink = (dat & 0x80000000) ? 16 + 15 : 16 + 0;
if (!(wy700->enabled) || !(wy700->cga_ctrl & 8))
ink = 16;
buffer32->line[wy700->displine][x * 64 + 2 * c] = buffer32->line[wy700->displine][x * 64 + 2 * c + 1] = ink;
dat = dat << 1;
}
} else {
for (c = 0; c < 16; c++) {
switch ((dat >> 30) & 3) {
case 0:
ink = 16 + 0;
break;
case 1:
ink = 16 + 8;
break;
case 2:
ink = 16 + 7;
break;
case 3:
ink = 16 + 15;
break;
default:
break;
}
if (!(wy700->enabled) || !(wy700->cga_ctrl & 8))
ink = 16;
buffer32->line[wy700->displine][x * 64 + 4 * c] = buffer32->line[wy700->displine][x * 64 + 4 * c + 1] = buffer32->line[wy700->displine][x * 64 + 4 * c + 2] = buffer32->line[wy700->displine][x * 64 + 4 * c + 3] = ink;
dat = dat << 2;
}
}
}
}
/* Draw a line in the medium-resolution graphics modes (640x400 or 320x400) */
void
wy700_medresline(wy700_t *wy700)
{
int c;
uint32_t dat;
uint8_t ink = 0;
uint32_t addr;
addr = (wy700->displine >> 1) * 80 + 4 * wy700->wy700_base;
for (uint8_t x = 0; x < 20; x++) {
dat = ((wy700->vram[addr & 0x1FFFF] << 24) | (wy700->vram[(addr + 1) & 0x1FFFF] << 16) | (wy700->vram[(addr + 2) & 0x1FFFF] << 8) | (wy700->vram[(addr + 3) & 0x1FFFF]));
addr += 4;
if (wy700->wy700_mode & 0x10) {
for (c = 0; c < 16; c++) {
switch ((dat >> 30) & 3) {
case 0:
ink = 16 + 0;
break;
case 1:
ink = 16 + 8;
break;
case 2:
ink = 16 + 7;
break;
case 3:
ink = 16 + 15;
break;
default:
break;
}
/* Display disabled? */
if (!(wy700->wy700_mode & 8))
ink = 16;
buffer32->line[wy700->displine][x * 64 + 4 * c] = buffer32->line[wy700->displine][x * 64 + 4 * c + 1] = buffer32->line[wy700->displine][x * 64 + 4 * c + 2] = buffer32->line[wy700->displine][x * 64 + 4 * c + 3] = ink;
dat = dat << 2;
}
} else {
for (c = 0; c < 32; c++) {
ink = (dat & 0x80000000) ? 16 + 15 : 16 + 0;
/* Display disabled? */
if (!(wy700->wy700_mode & 8))
ink = 16;
buffer32->line[wy700->displine][x * 64 + 2 * c] = buffer32->line[wy700->displine][x * 64 + 2 * c + 1] = ink;
dat = dat << 1;
}
}
}
}
/* Draw a line in one of the high-resolution modes */
void
wy700_hiresline(wy700_t *wy700)
{
int c;
uint32_t dat;
uint8_t ink = 0;
uint32_t addr;
addr = (wy700->displine >> 1) * 160 + 4 * wy700->wy700_base;
if (wy700->wy700_mode & 0x40) /* 800-line interleaved modes */
{
if (wy700->displine & 1)
addr += 0x10000;
}
for (uint8_t x = 0; x < 40; x++) {
dat = ((wy700->vram[addr & 0x1FFFF] << 24) | (wy700->vram[(addr + 1) & 0x1FFFF] << 16) | (wy700->vram[(addr + 2) & 0x1FFFF] << 8) | (wy700->vram[(addr + 3) & 0x1FFFF]));
addr += 4;
if (wy700->wy700_mode & 0x10) {
for (c = 0; c < 16; c++) {
switch ((dat >> 30) & 3) {
case 0:
ink = 16 + 0;
break;
case 1:
ink = 16 + 8;
break;
case 2:
ink = 16 + 7;
break;
case 3:
ink = 16 + 15;
break;
default:
break;
}
/* Display disabled? */
if (!(wy700->wy700_mode & 8))
ink = 16;
buffer32->line[wy700->displine][x * 32 + 2 * c] = buffer32->line[wy700->displine][x * 32 + 2 * c + 1] = ink;
dat = dat << 2;
}
} else {
for (c = 0; c < 32; c++) {
ink = (dat & 0x80000000) ? 16 + 15 : 16 + 0;
/* Display disabled? */
if (!(wy700->wy700_mode & 8))
ink = 16;
buffer32->line[wy700->displine][x * 32 + c] = ink;
dat = dat << 1;
}
}
}
}
void
wy700_poll(void *priv)
{
wy700_t *wy700 = (wy700_t *) priv;
int mode;
if (!wy700->linepos) {
timer_advance_u64(&wy700->timer, wy700->dispofftime);
wy700->cga_stat |= 1;
wy700->mda_stat |= 1;
wy700->linepos = 1;
if (wy700->dispon) {
if (wy700->displine == 0) {
video_wait_for_buffer();
}
if (wy700->wy700_mode & 0x80)
mode = wy700->wy700_mode & 0xF0;
else
mode = wy700->wy700_mode & 0x0F;
switch (mode) {
default:
case 0x00:
case 0x02:
wy700_textline(wy700);
break;
case 0x04:
case 0x06:
wy700_cgaline(wy700);
break;
case 0x80:
case 0x90:
wy700_medresline(wy700);
break;
case 0xA0:
case 0xB0:
case 0xC0:
case 0xD0:
case 0xE0:
case 0xF0:
wy700_hiresline(wy700);
break;
}
}
video_process_8(WY700_XSIZE, wy700->displine);
wy700->displine++;
/* Hardcode a fixed refresh rate and VSYNC timing */
if (wy700->displine == 800) /* Start of VSYNC */
{
wy700->cga_stat |= 8;
wy700->dispon = 0;
}
if (wy700->displine == 832) /* End of VSYNC */
{
wy700->displine = 0;
wy700->cga_stat &= ~8;
wy700->dispon = 1;
}
} else {
if (wy700->dispon) {
wy700->cga_stat &= ~1;
wy700->mda_stat &= ~1;
}
timer_advance_u64(&wy700->timer, wy700->dispontime);
wy700->linepos = 0;
if (wy700->displine == 800) {
/* Hardcode 1280x800 window size */
if ((WY700_XSIZE != xsize) || (WY700_YSIZE != ysize) || video_force_resize_get()) {
xsize = WY700_XSIZE;
ysize = WY700_YSIZE;
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 1280x800 resolution */
video_res_x = WY700_XSIZE;
video_res_y = WY700_YSIZE;
if (wy700->wy700_mode & 0x80)
mode = wy700->wy700_mode & 0xF0;
else
mode = wy700->wy700_mode & 0x0F;
switch (mode) {
case 0x00:
case 0x02:
video_bpp = 0;
break;
case 0x04:
case 0x90:
case 0xB0:
case 0xD0:
case 0xF0:
video_bpp = 2;
break;
default:
video_bpp = 1;
break;
}
wy700->blink++;
}
}
}
void *
wy700_init(UNUSED(const device_t *info))
{
int c;
wy700_t *wy700 = malloc(sizeof(wy700_t));
memset(wy700, 0, sizeof(wy700_t));
video_inform(VIDEO_FLAG_TYPE_CGA, &timing_wy700);
/* 128k video RAM */
wy700->vram = malloc(0x20000);
loadfont("roms/video/wyse700/wy700.rom", 3);
timer_add(&wy700->timer, wy700_poll, wy700, 1);
/* Occupy memory between 0xB0000 and 0xBFFFF (moves to 0xA0000 in
* high-resolution modes) */
mem_mapping_add(&wy700->mapping, 0xb0000, 0x10000, wy700_read, NULL, NULL, wy700_write, NULL, NULL, NULL, MEM_MAPPING_EXTERNAL, wy700);
/* Respond to both MDA and CGA I/O ports */
io_sethandler(0x03b0, 0x000C, wy700_in, NULL, NULL, wy700_out, NULL, NULL, wy700);
io_sethandler(0x03d0, 0x0010, wy700_in, NULL, NULL, wy700_out, NULL, NULL, wy700);
/* Set up the emulated attributes.
* CGA is done in four groups: 00-0F, 10-7F, 80-8F, 90-FF */
for (c = 0; c < 0x10; c++) {
cgacols[c][0][0] = cgacols[c][1][0] = cgacols[c][1][1] = 16;
if (c & 8)
cgacols[c][0][1] = 15 + 16;
else
cgacols[c][0][1] = 7 + 16;
}
for (c = 0x10; c < 0x80; c++) {
cgacols[c][0][0] = cgacols[c][1][0] = cgacols[c][1][1] = 16 + 7;
if (c & 8)
cgacols[c][0][1] = 15 + 16;
else
cgacols[c][0][1] = 0 + 16;
if ((c & 0x0F) == 8)
cgacols[c][0][1] = 8 + 16;
}
/* With special cases for 00, 11, 22, ... 77 */
cgacols[0x00][0][1] = cgacols[0x00][1][1] = 16;
for (c = 0x11; c <= 0x77; c += 0x11) {
cgacols[c][0][1] = cgacols[c][1][1] = 16 + 7;
}
for (c = 0x80; c < 0x90; c++) {
cgacols[c][0][0] = 16 + 8;
if (c & 8)
cgacols[c][0][1] = 15 + 16;
else
cgacols[c][0][1] = 7 + 16;
cgacols[c][1][0] = cgacols[c][1][1] = cgacols[c - 0x80][0][0];
}
for (c = 0x90; c < 0x100; c++) {
cgacols[c][0][0] = 16 + 15;
if (c & 8)
cgacols[c][0][1] = 8 + 16;
else
cgacols[c][0][1] = 7 + 16;
if ((c & 0x0F) == 0)
cgacols[c][0][1] = 16;
cgacols[c][1][0] = cgacols[c][1][1] = cgacols[c - 0x80][0][0];
}
/* Also special cases for 99, AA, ..., FF */
for (c = 0x99; c <= 0xFF; c += 0x11) {
cgacols[c][0][1] = 16 + 15;
}
/* Special cases for 08, 80 and 88 */
cgacols[0x08][0][1] = 16 + 8;
cgacols[0x80][0][1] = 16;
cgacols[0x88][0][1] = 16 + 8;
/* MDA attributes */
for (c = 0; c < 256; c++) {
mdacols[c][0][0] = mdacols[c][1][0] = mdacols[c][1][1] = 16;
if (c & 8)
mdacols[c][0][1] = 15 + 16;
else
mdacols[c][0][1] = 7 + 16;
}
mdacols[0x70][0][1] = 16;
mdacols[0x70][0][0] = mdacols[0x70][1][0] = mdacols[0x70][1][1] = 16 + 15;
mdacols[0xF0][0][1] = 16;
mdacols[0xF0][0][0] = mdacols[0xF0][1][0] = mdacols[0xF0][1][1] = 16 + 15;
mdacols[0x78][0][1] = 16 + 7;
mdacols[0x78][0][0] = mdacols[0x78][1][0] = mdacols[0x78][1][1] = 16 + 15;
mdacols[0xF8][0][1] = 16 + 7;
mdacols[0xF8][0][0] = mdacols[0xF8][1][0] = mdacols[0xF8][1][1] = 16 + 15;
mdacols[0x00][0][1] = mdacols[0x00][1][1] = 16;
mdacols[0x08][0][1] = mdacols[0x08][1][1] = 16;
mdacols[0x80][0][1] = mdacols[0x80][1][1] = 16;
mdacols[0x88][0][1] = mdacols[0x88][1][1] = 16;
/* Start off in 80x25 text mode */
wy700->cga_stat = 0xF4;
wy700->wy700_mode = 2;
wy700->enabled = 1;
memcpy(wy700->real_crtc, mode_80x24, sizeof(mode_80x24));
return wy700;
}
void
wy700_close(void *priv)
{
wy700_t *wy700 = (wy700_t *) priv;
free(wy700->vram);
free(wy700);
}
void
wy700_speed_changed(void *priv)
{
wy700_t *wy700 = (wy700_t *) priv;
wy700_recalctimings(wy700);
}
const device_t wy700_device = {
.name = "Wyse 700",
.internal_name = "wy700",
.flags = DEVICE_ISA,
.local = 0,
.init = wy700_init,
.close = wy700_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = wy700_speed_changed,
.force_redraw = NULL,
.config = NULL
};