/* * VARCem Virtual ARchaeological Computer EMulator. * An emulator of (mostly) x86-based PC systems and devices, * using the ISA,EISA,VLB,MCA and PCI system buses, roughly * spanning the era between 1981 and 1995. * * This file is part of the VARCem Project. * * Implementation of the Toshiba T1000 plasma display, which * has a fixed resolution of 640x200 pixels. * * * * Authors: Fred N. van Kempen, * Miran Grca, * Sarah Walker, * * Copyright 2018,2019 Fred N. van Kempen. * Copyright 2018,2019 Miran Grca. * Copyright 2018,2019 Sarah Walker. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the: * * Free Software Foundation, Inc. * 59 Temple Place - Suite 330 * Boston, MA 02111-1307 * USA. */ #include #include #include #include #include #include <86box/86box.h> #include <86box/device.h> #include <86box/io.h> #include <86box/mem.h> #include <86box/timer.h> #include "cpu.h" #include <86box/video.h> #include <86box/vid_cga.h> #include <86box/m_xt_t1000.h> #define T1000_XSIZE 640 #define T1000_YSIZE 200 /* Mapping of attributes to colours */ static uint32_t blue, grey; static uint8_t boldcols[256]; /* Which attributes use the bold font */ static uint32_t blinkcols[256][2]; static uint32_t normcols[256][2]; static uint8_t language; static video_timings_t timing_t1000 = {VIDEO_ISA, 8,16,32, 8,16,32}; /* Video options set by the motherboard; they will be picked up by the card * on the next poll. * * Bit 1: Danish * Bit 0: Thin font */ static uint8_t st_video_options; static uint8_t st_enabled = 1; static int8_t st_display_internal = -1; void t1000_video_options_set(uint8_t options) { st_video_options = options & 1; st_video_options |= language; } void t1000_video_enable(uint8_t enabled) { st_enabled = enabled; } void t1000_display_set(uint8_t internal) { st_display_internal = (int8_t)internal; } uint8_t t1000_display_get() { return (uint8_t)st_display_internal; } typedef struct t1000_t { mem_mapping_t mapping; cga_t cga; /* The CGA is used for the external * display; most of its registers are * ignored by the plasma display. */ int font; /* Current font, 0-3 */ int enabled; /* Hardware enabled, 0 or 1 */ int internal; /* Using internal display? */ uint8_t attrmap; /* Attribute mapping register */ uint64_t dispontime, dispofftime; int linepos, displine; int vc; int dispon; int vsynctime; uint8_t video_options; uint8_t backlight, invert; uint8_t *vram; } t1000_t; static void t1000_recalctimings(t1000_t *t1000); static void t1000_write(uint32_t addr, uint8_t val, void *p); static uint8_t t1000_read(uint32_t addr, void *p); static void t1000_recalcattrs(t1000_t *t1000); static void t1000_out(uint16_t addr, uint8_t val, void *p) { t1000_t *t1000 = (t1000_t *)p; switch (addr) { /* Emulated CRTC, register select */ case 0x3d0: case 0x3d2: case 0x3d4: case 0x3d6: cga_out(addr, val, &t1000->cga); break; /* Emulated CRTC, value */ case 0x3d1: case 0x3d3: case 0x3d5: case 0x3d7: /* Register 0x12 controls the attribute mappings for the * LCD screen. */ if (t1000->cga.crtcreg == 0x12) { t1000->attrmap = val; t1000_recalcattrs(t1000); return; } cga_out(addr, val, &t1000->cga); t1000_recalctimings(t1000); return; /* CGA control register */ case 0x3D8: cga_out(addr, val, &t1000->cga); return; /* CGA colour register */ case 0x3D9: cga_out(addr, val, &t1000->cga); return; } } static uint8_t t1000_in(uint16_t addr, void *p) { t1000_t *t1000 = (t1000_t *)p; uint8_t val; switch (addr) { case 0x3d1: case 0x3d3: case 0x3d5: case 0x3d7: if (t1000->cga.crtcreg == 0x12) { val = t1000->attrmap & 0x0F; if (t1000->internal) val |= 0x20; /* LCD / CRT */ return val; } } return cga_in(addr, &t1000->cga); } static void t1000_write(uint32_t addr, uint8_t val, void *p) { t1000_t *t1000 = (t1000_t *)p; t1000->vram[addr & 0x3fff] = val; cycles -= 4; } static uint8_t t1000_read(uint32_t addr, void *p) { t1000_t *t1000 = (t1000_t *)p; cycles -= 4; return t1000->vram[addr & 0x3fff]; } static void t1000_recalctimings(t1000_t *t1000) { double disptime; double _dispontime, _dispofftime; if (!t1000->internal) { cga_recalctimings(&t1000->cga); return; } disptime = 651; _dispontime = 640; _dispofftime = disptime - _dispontime; t1000->dispontime = (uint64_t)(_dispontime * xt_cpu_multi); t1000->dispofftime = (uint64_t)(_dispofftime * xt_cpu_multi); } /* Draw a row of text in 80-column mode */ static void t1000_text_row80(t1000_t *t1000) { uint32_t cols[2]; int x, c; uint8_t chr, attr; int drawcursor; int cursorline; int bold; int blink; uint16_t addr; uint8_t sc; uint16_t ma = (t1000->cga.crtc[13] | (t1000->cga.crtc[12] << 8)) & 0x3fff; uint16_t ca = (t1000->cga.crtc[15] | (t1000->cga.crtc[14] << 8)) & 0x3fff; sc = (t1000->displine) & 7; addr = ((ma & ~1) + (t1000->displine >> 3) * 80) * 2; ma += (t1000->displine >> 3) * 80; if ((t1000->cga.crtc[10] & 0x60) == 0x20) { cursorline = 0; } else { cursorline = ((t1000->cga.crtc[10] & 0x0F) <= sc) && ((t1000->cga.crtc[11] & 0x0F) >= sc); } for (x = 0; x < 80; x++) { chr = t1000->vram[(addr + 2 * x) & 0x3FFF]; attr = t1000->vram[(addr + 2 * x + 1) & 0x3FFF]; drawcursor = ((ma == ca) && cursorline && (t1000->cga.cgamode & 8) && (t1000->cga.cgablink & 16)); blink = ((t1000->cga.cgablink & 16) && (t1000->cga.cgamode & 0x20) && (attr & 0x80) && !drawcursor); if (t1000->video_options & 1) bold = boldcols[attr] ? chr : chr + 256; else bold = boldcols[attr] ? chr + 256 : chr; if (t1000->video_options & 2) bold += 512; if (t1000->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[t1000->displine])[(x << 3) + c] = cols[(fontdat[bold][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (blue ^ grey); } } else { for (c = 0; c < 8; c++) ((uint32_t *)buffer32->line[t1000->displine])[(x << 3) + c] = cols[(fontdat[bold][sc] & (1 << (c ^ 7))) ? 1 : 0]; } ++ma; } } /* Draw a row of text in 40-column mode */ static void t1000_text_row40(t1000_t *t1000) { uint32_t cols[2]; int x, c; uint8_t chr, attr; int drawcursor; int cursorline; int bold; int blink; uint16_t addr; uint8_t sc; uint16_t ma = (t1000->cga.crtc[13] | (t1000->cga.crtc[12] << 8)) & 0x3fff; uint16_t ca = (t1000->cga.crtc[15] | (t1000->cga.crtc[14] << 8)) & 0x3fff; sc = (t1000->displine) & 7; addr = ((ma & ~1) + (t1000->displine >> 3) * 40) * 2; ma += (t1000->displine >> 3) * 40; if ((t1000->cga.crtc[10] & 0x60) == 0x20) { cursorline = 0; } else { cursorline = ((t1000->cga.crtc[10] & 0x0F) <= sc) && ((t1000->cga.crtc[11] & 0x0F) >= sc); } for (x = 0; x < 40; x++) { chr = t1000->vram[(addr + 2 * x) & 0x3FFF]; attr = t1000->vram[(addr + 2 * x + 1) & 0x3FFF]; drawcursor = ((ma == ca) && cursorline && (t1000->cga.cgamode & 8) && (t1000->cga.cgablink & 16)); blink = ((t1000->cga.cgablink & 16) && (t1000->cga.cgamode & 0x20) && (attr & 0x80) && !drawcursor); if (t1000->video_options & 1) bold = boldcols[attr] ? chr : chr + 256; else bold = boldcols[attr] ? chr + 256 : chr; if (t1000->video_options & 2) bold += 512; if (t1000->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[t1000->displine])[(x << 4) + c*2] = ((uint32_t *)buffer32->line[t1000->displine])[(x << 4) + c*2 + 1] = cols[(fontdat[bold][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (blue ^ grey); } } else { for (c = 0; c < 8; c++) { ((uint32_t *)buffer32->line[t1000->displine])[(x << 4) + c*2] = ((uint32_t *)buffer32->line[t1000->displine])[(x << 4) + c*2+1] = cols[(fontdat[bold][sc] & (1 << (c ^ 7))) ? 1 : 0]; } } ++ma; } } /* Draw a line in CGA 640x200 mode */ static void t1000_cgaline6(t1000_t *t1000) { int x, c; uint8_t dat; uint32_t ink = 0; uint16_t addr; uint32_t fg = (t1000->cga.cgacol & 0x0F) ? blue : grey; uint32_t bg = grey; uint16_t ma = (t1000->cga.crtc[13] | (t1000->cga.crtc[12] << 8)) & 0x3fff; addr = ((t1000->displine) & 1) * 0x2000 + (t1000->displine >> 1) * 80 + ((ma & ~1) << 1); for (x = 0; x < 80; x++) { dat = t1000->vram[addr & 0x3FFF]; addr++; for (c = 0; c < 8; c++) { ink = (dat & 0x80) ? fg : bg; if (!(t1000->cga.cgamode & 8)) ink = grey; ((uint32_t *)buffer32->line[t1000->displine])[x*8+c] = ink; dat = 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 t1000_cgaline4(t1000_t *t1000) { int x, c; uint8_t dat, pattern; uint32_t ink0, ink1; uint16_t addr; uint16_t ma = (t1000->cga.crtc[13] | (t1000->cga.crtc[12] << 8)) & 0x3fff; addr = ((t1000->displine) & 1) * 0x2000 + (t1000->displine >> 1) * 80 + ((ma & ~1) << 1); for (x = 0; x < 80; x++) { dat = t1000->vram[addr & 0x3FFF]; addr++; for (c = 0; c < 4; c++) { pattern = (dat & 0xC0) >> 6; if (!(t1000->cga.cgamode & 8)) pattern = 0; switch (pattern & 3) { default: case 0: ink0 = ink1 = grey; break; case 1: if (t1000->displine & 1) { ink0 = grey; ink1 = grey; } else { ink0 = blue; ink1 = grey; } break; case 2: if (t1000->displine & 1) { ink0 = grey; ink1 = blue; } else { ink0 = blue; ink1 = grey; } break; case 3: ink0 = ink1 = blue; break; } ((uint32_t *)buffer32->line[t1000->displine])[x*8+2*c] = ink0; ((uint32_t *)buffer32->line[t1000->displine])[x*8+2*c+1] = ink1; dat = dat << 2; } } } static void t1000_poll(void *p) { t1000_t *t1000 = (t1000_t *)p; if (t1000->video_options != st_video_options || t1000->enabled != st_enabled) { t1000->video_options = st_video_options; t1000->enabled = st_enabled; /* Set the font used for the external display */ t1000->cga.fontbase = ((t1000->video_options & 3) * 256); if (t1000->enabled) /* Disable internal chipset */ mem_mapping_enable(&t1000->mapping); else mem_mapping_disable(&t1000->mapping); } /* Switch between internal plasma and external CRT display. */ if (st_display_internal != -1 && st_display_internal != t1000->internal) { t1000->internal = st_display_internal; t1000_recalctimings(t1000); } if (!t1000->internal) { cga_poll(&t1000->cga); return; } if (!t1000->linepos) { timer_advance_u64(&t1000->cga.timer, t1000->dispofftime); t1000->cga.cgastat |= 1; t1000->linepos = 1; if (t1000->dispon) { if (t1000->displine == 0) { video_wait_for_buffer(); } /* Graphics */ if (t1000->cga.cgamode & 0x02) { if (t1000->cga.cgamode & 0x10) t1000_cgaline6(t1000); else t1000_cgaline4(t1000); } else if (t1000->cga.cgamode & 0x01) /* High-res text */ { t1000_text_row80(t1000); } else { t1000_text_row40(t1000); } } t1000->displine++; /* Hardcode a fixed refresh rate and VSYNC timing */ if (t1000->displine == 200) /* Start of VSYNC */ { t1000->cga.cgastat |= 8; t1000->dispon = 0; } if (t1000->displine == 216) /* End of VSYNC */ { t1000->displine = 0; t1000->cga.cgastat &= ~8; t1000->dispon = 1; } } else { if (t1000->dispon) { t1000->cga.cgastat &= ~1; } timer_advance_u64(&t1000->cga.timer, t1000->dispontime); t1000->linepos = 0; if (t1000->displine == 200) { /* Hardcode 640x200 window size */ if ((T1000_XSIZE != xsize) || (T1000_YSIZE != ysize) || video_force_resize_get()) { xsize = T1000_XSIZE; ysize = T1000_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 640x200 resolution */ video_res_x = T1000_XSIZE; video_res_y = T1000_YSIZE; if (t1000->cga.cgamode & 0x02) { if (t1000->cga.cgamode & 0x10) video_bpp = 1; else video_bpp = 2; } else video_bpp = 0; t1000->cga.cgablink++; } } } static void t1000_recalcattrs(t1000_t *t1000) { 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 */ if (t1000->invert) { if (t1000->backlight) { grey = makecol(0x2D, 0x39, 0x5A); blue = makecol(0x85, 0xa0, 0xD6); } else { grey = makecol(0x0f, 0x21, 0x3f); blue = makecol(0x1C, 0x71, 0x31); } } else { if (t1000->backlight) { blue = makecol(0x2D, 0x39, 0x5A); grey = makecol(0x85, 0xa0, 0xD6); } else { blue = makecol(0x0f, 0x21, 0x3f); grey = makecol(0x1C, 0x71, 0x31); } } /* Initialise the attribute mapping. Start by defaulting everything * to grey on blue, and with bold set by bit 3 */ for (n = 0; n < 256; n++) { boldcols[n] = (n & 8) != 0; blinkcols[n][0] = normcols[n][0] = blue; blinkcols[n][1] = normcols[n][1] = grey; } /* Colours 0x11-0xFF are controlled by bits 2 and 3 of the * passed value. Exclude x0 and x8, which are always grey on * blue. */ for (n = 0x11; n <= 0xFF; n++) { if ((n & 7) == 0) continue; if (t1000->attrmap & 4) /* Inverse */ { blinkcols[n][0] = normcols[n][0] = blue; blinkcols[n][1] = normcols[n][1] = grey; } else /* Normal */ { blinkcols[n][0] = normcols[n][0] = grey; blinkcols[n][1] = normcols[n][1] = blue; } if (t1000->attrmap & 8) boldcols[n] = 1; /* Bold */ } /* 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 (t1000->attrmap & 1) { blinkcols[n][0] = normcols[n][0] = blue; blinkcols[n][1] = normcols[n][1] = grey; blinkcols[n+128][0] = blue; blinkcols[n+128][1] = grey; } else { blinkcols[n][0] = normcols[n][0] = grey; blinkcols[n][1] = normcols[n][1] = blue; blinkcols[n+128][0] = grey; blinkcols[n+128][1] = blue; } if (t1000->attrmap & 2) boldcols[n] = 1; } /* Colours 07 and 0F are always blue on grey. If blinking is * enabled so are 87 and 8F. */ for (n = 0x07; n <= 0x0F; n += 8) { blinkcols[n][0] = normcols[n][0] = grey; blinkcols[n][1] = normcols[n][1] = blue; blinkcols[n+128][0] = grey; blinkcols[n+128][1] = blue; } /* When not blinking, colours 81-8F are always blue on grey. */ for (n = 0x81; n <= 0x8F; n ++) { normcols[n][0] = grey; normcols[n][1] = blue; boldcols[n] = (n & 0x08) != 0; } /* Finally do the ones which are solid grey. These differ between * the normal and blinking mappings */ for (n = 0; n <= 0xFF; n += 0x11) { normcols[n][0] = normcols[n][1] = grey; } /* In the blinking range, 00 11 22 .. 77 and 80 91 A2 .. F7 are grey */ for (n = 0; n <= 0x77; n += 0x11) { blinkcols[n][0] = blinkcols[n][1] = grey; blinkcols[n+128][0] = blinkcols[n+128][1] = grey; } } static void *t1000_init(const device_t *info) { t1000_t *t1000 = malloc(sizeof(t1000_t)); memset(t1000, 0, sizeof(t1000_t)); loadfont("roms/machines/t1000/t1000font.bin", 8); cga_init(&t1000->cga); video_inform(VIDEO_FLAG_TYPE_CGA, &timing_t1000); t1000->internal = 1; t1000->backlight = device_get_config_int("backlight"); t1000->invert = device_get_config_int("invert"); /* 16k video RAM */ t1000->vram = malloc(0x4000); timer_set_callback(&t1000->cga.timer, t1000_poll); timer_set_p(&t1000->cga.timer, t1000); /* Occupy memory between 0xB8000 and 0xBFFFF */ mem_mapping_add(&t1000->mapping, 0xb8000, 0x8000, t1000_read, NULL, NULL, t1000_write, NULL, NULL, NULL, 0, t1000); /* Respond to CGA I/O ports */ io_sethandler(0x03d0, 0x000c, t1000_in, NULL, NULL, t1000_out, NULL, NULL, t1000); /* Default attribute mapping is 4 */ t1000->attrmap = 4; t1000_recalcattrs(t1000); /* Start off in 80x25 text mode */ t1000->cga.cgastat = 0xF4; t1000->cga.vram = t1000->vram; t1000->enabled = 1; t1000->video_options = 0x01; language = device_get_config_int("display_language") ? 2 : 0; return t1000; } static void t1000_close(void *p) { t1000_t *t1000 = (t1000_t *)p; free(t1000->vram); free(t1000); } static void t1000_speed_changed(void *p) { t1000_t *t1000 = (t1000_t *)p; t1000_recalctimings(t1000); } static const device_config_t t1000_config[] = { { .name = "display_language", .description = "Language", .type = CONFIG_SELECTION, .selection = { { .description = "USA", .value = 0 }, { .description = "Danish", .value = 1 } }, .default_int = 0 }, { "backlight", "Enable backlight", CONFIG_BINARY, "", 1 }, { "invert", "Invert colors", CONFIG_BINARY, "", 0 }, { .type = -1 } }; const device_t t1000_video_device = { "Toshiba T1000 Video", 0, 0, t1000_init, t1000_close, NULL, { NULL }, t1000_speed_changed, NULL, t1000_config }; const device_t t1200_video_device = { "Toshiba T1200 Video", 0, 0, t1000_init, t1000_close, NULL, { NULL }, t1000_speed_changed, NULL, t1000_config };