dc46480aa4
Added experimental NVidia Riva TNT2 emulation (patch from MoochMcGee); ASUS P/I-P54TP4XE, ASUS P/I-P55T2P4, and ASUS P/I-P55TVP4 are back; National Semiconductor PC87306 Super I/O chip now correctly reenables devices after a chip power cycle; Several FDC improvements and the behavior is now a bit closer to real hardware (based on actual tests); Added MR Intel Advanced/ATX with Microid Research BIOS with support for 4 floppy drives and up to 4 IDE controllers; Added floppy drives 3 and 4, bringing the maximum to 4; You can now connect hard disks to the tertiary IDE controller; Correct undocumented behavior of the LEA instruction with register is back on 286 and later CPU's; Pentium-rea models with Intel chipsets now have port 92 (with alternate reset and alternate A20 toggle); Overhauled DMA channel read and write routines and fixed cascading; Improved IMG detection of a bad BPB (or complete lack of a BPB); Added preliminary emulation of PS/2 1.44 MB and PC-98 1.25 MB 3-mode drives (both have an inverted DENSEL pin); Removed the incorrect Amstrad mouse patch from TheCollector1995; Fixed ATAPI CD-ROM disk change detection; Windows IOCTL CD-ROM handler now tries to use direct SCSI passthrough for more things, including obtaining CD-ROM capacity; The Diamond Stealth32 (ET4000/W32p) now also works correctly on the two Award SiS 496/497 boxes; The (S)VGA handler now converts 6-bit RAMDAC RGB channels to standard 8-bit RGB using a lookup table generated at emulator start, calculated using the correct intensity conversion method and treating intensity 64 as equivalent to 63; Moved a few options from the Configuration dialog box to the menu; SIO, PIIX, and PIIX3 now have the reset control register on port CF9 as they should; Several bugfixes.
548 lines
23 KiB
C
548 lines
23 KiB
C
/* Copyright holders: Sarah Walker, Tenshi
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see COPYING for more details
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*/
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/*CGA emulation*/
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#include <stdlib.h>
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#include <math.h>
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#include "ibm.h"
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#include "device.h"
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#include "io.h"
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#include "mem.h"
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#include "timer.h"
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#include "video.h"
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#include "vid_cga.h"
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#include "dosbox/vid_cga_comp.h"
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#define CGA_RGB 0
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#define CGA_COMPOSITE 1
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#define COMPOSITE_OLD 0
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#define COMPOSITE_NEW 1
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static uint8_t crtcmask[32] =
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{
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0xff, 0xff, 0xff, 0xff, 0x7f, 0x1f, 0x7f, 0x7f, 0xf3, 0x1f, 0x7f, 0x1f, 0x3f, 0xff, 0x3f, 0xff,
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0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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void cga_recalctimings(cga_t *cga);
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void cga_out(uint16_t addr, uint8_t val, void *p)
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{
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cga_t *cga = (cga_t *)p;
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uint8_t old;
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// pclog("CGA_OUT %04X %02X\n", addr, val);
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switch (addr)
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{
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case 0x3D4:
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cga->crtcreg = val & 31;
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return;
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case 0x3D5:
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old = cga->crtc[cga->crtcreg];
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cga->crtc[cga->crtcreg] = val & crtcmask[cga->crtcreg];
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if (old != val)
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{
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if (cga->crtcreg < 0xe || cga->crtcreg > 0x10)
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{
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fullchange = changeframecount;
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cga_recalctimings(cga);
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}
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}
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return;
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case 0x3D8:
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if (((cga->cgamode ^ val) & 5) != 0)
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{
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cga->cgamode = val;
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update_cga16_color(cga->cgamode);
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}
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cga->cgamode = val;
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return;
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case 0x3D9:
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cga->cgacol = val;
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return;
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}
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}
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uint8_t cga_in(uint16_t addr, void *p)
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{
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cga_t *cga = (cga_t *)p;
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// pclog("CGA_IN %04X\n", addr);
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switch (addr)
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{
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case 0x3D4:
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return cga->crtcreg;
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case 0x3D5:
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return cga->crtc[cga->crtcreg];
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case 0x3DA:
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return cga->cgastat;
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}
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return 0xFF;
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}
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void cga_write(uint32_t addr, uint8_t val, void *p)
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{
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cga_t *cga = (cga_t *)p;
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// pclog("CGA_WRITE %04X %02X\n", addr, val);
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cga->vram[addr & 0x3fff] = val;
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if (cga->snow_enabled)
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{
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cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = val;
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cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = val;
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}
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egawrites++;
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cycles -= 4;
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}
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uint8_t cga_read(uint32_t addr, void *p)
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{
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cga_t *cga = (cga_t *)p;
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cycles -= 4;
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if (cga->snow_enabled)
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{
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cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = cga->vram[addr & 0x3fff];
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cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = cga->vram[addr & 0x3fff];
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}
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egareads++;
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// pclog("CGA_READ %04X\n", addr);
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return cga->vram[addr & 0x3fff];
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}
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void cga_recalctimings(cga_t *cga)
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{
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double disptime;
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double _dispontime, _dispofftime;
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pclog("Recalc - %i %i %i\n", cga->crtc[0], cga->crtc[1], cga->cgamode & 1);
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if (cga->cgamode & 1)
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{
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disptime = cga->crtc[0] + 1;
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_dispontime = cga->crtc[1];
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}
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else
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{
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disptime = (cga->crtc[0] + 1) << 1;
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_dispontime = cga->crtc[1] << 1;
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}
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_dispofftime = disptime - _dispontime;
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// printf("%i %f %f %f %i %i\n",cgamode&1,disptime,dispontime,dispofftime,crtc[0],crtc[1]);
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_dispontime *= CGACONST;
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_dispofftime *= CGACONST;
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// printf("Timings - on %f off %f frame %f second %f\n",dispontime,dispofftime,(dispontime+dispofftime)*262.0,(dispontime+dispofftime)*262.0*59.92);
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cga->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
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cga->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
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}
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void cga_poll(void *p)
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{
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cga_t *cga = (cga_t *)p;
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uint16_t ca = (cga->crtc[15] | (cga->crtc[14] << 8)) & 0x3fff;
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int drawcursor;
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int x, c;
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int oldvc;
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uint8_t chr, attr;
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uint16_t dat;
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int cols[4];
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int col;
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int oldsc;
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if (!cga->linepos)
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{
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cga->vidtime += cga->dispofftime;
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cga->cgastat |= 1;
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cga->linepos = 1;
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oldsc = cga->sc;
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if ((cga->crtc[8] & 3) == 3)
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cga->sc = ((cga->sc << 1) + cga->oddeven) & 7;
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if (cga->cgadispon)
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{
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if (cga->displine < cga->firstline)
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{
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cga->firstline = cga->displine;
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video_wait_for_buffer();
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// printf("Firstline %i\n",firstline);
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}
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cga->lastline = cga->displine;
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for (c = 0; c < 8; c++)
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{
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if ((cga->cgamode & 0x12) == 0x12)
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{
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buffer->line[cga->displine][c] = 0;
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if (cga->cgamode & 1) buffer->line[cga->displine][c + (cga->crtc[1] << 3) + 8] = 0;
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else buffer->line[cga->displine][c + (cga->crtc[1] << 4) + 8] = 0;
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}
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else
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{
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buffer->line[cga->displine][c] = (cga->cgacol & 15) + 16;
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if (cga->cgamode & 1) buffer->line[cga->displine][c + (cga->crtc[1] << 3) + 8] = (cga->cgacol & 15) + 16;
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else buffer->line[cga->displine][c + (cga->crtc[1] << 4) + 8] = (cga->cgacol & 15) + 16;
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}
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}
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if (cga->cgamode & 1)
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{
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for (x = 0; x < cga->crtc[1]; x++)
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{
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chr = cga->charbuffer[x << 1];
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attr = cga->charbuffer[(x << 1) + 1];
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drawcursor = ((cga->ma == ca) && cga->con && cga->cursoron);
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if (cga->cgamode & 0x20)
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{
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cols[1] = (attr & 15) + 16;
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cols[0] = ((attr >> 4) & 7) + 16;
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if ((cga->cgablink & 8) && (attr & 0x80) && !cga->drawcursor)
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cols[1] = cols[0];
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}
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else
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{
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cols[1] = (attr & 15) + 16;
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cols[0] = (attr >> 4) + 16;
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}
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if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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buffer->line[cga->displine][(x << 3) + c + 8] = cols[(fontdat[chr][cga->sc & 7] & (1 << (c ^ 7))) ? 1 : 0] ^ 15;
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}
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else
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{
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for (c = 0; c < 8; c++)
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buffer->line[cga->displine][(x << 3) + c + 8] = cols[(fontdat[chr][cga->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
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}
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cga->ma++;
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}
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}
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else if (!(cga->cgamode & 2))
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{
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for (x = 0; x < cga->crtc[1]; x++)
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{
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chr = cga->vram[((cga->ma << 1) & 0x3fff)];
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attr = cga->vram[(((cga->ma << 1) + 1) & 0x3fff)];
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drawcursor = ((cga->ma == ca) && cga->con && cga->cursoron);
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if (cga->cgamode & 0x20)
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{
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cols[1] = (attr & 15) + 16;
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cols[0] = ((attr >> 4) & 7) + 16;
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if ((cga->cgablink & 8) && (attr & 0x80)) cols[1] = cols[0];
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}
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else
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{
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cols[1] = (attr & 15) + 16;
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cols[0] = (attr >> 4) + 16;
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}
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cga->ma++;
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if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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buffer->line[cga->displine][(x << 4)+(c << 1) + 8] = buffer->line[cga->displine][(x << 4) + (c << 1) + 1 + 8] = cols[(fontdat[chr][cga->sc & 7] & (1 << (c ^ 7))) ? 1 : 0] ^ 15;
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}
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else
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{
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for (c = 0; c < 8; c++)
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buffer->line[cga->displine][(x << 4) + (c << 1) + 8] = buffer->line[cga->displine][(x << 4) + (c << 1) + 1 + 8] = cols[(fontdat[chr][cga->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
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}
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}
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}
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else if (!(cga->cgamode & 16))
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{
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cols[0] = (cga->cgacol & 15) | 16;
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col = (cga->cgacol & 16) ? 24 : 16;
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if (cga->cgamode & 4)
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{
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cols[1] = col | 3;
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cols[2] = col | 4;
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cols[3] = col | 7;
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}
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else if (cga->cgacol & 32)
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{
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cols[1] = col | 3;
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cols[2] = col | 5;
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cols[3] = col | 7;
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}
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else
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{
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cols[1] = col | 2;
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cols[2] = col | 4;
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cols[3] = col | 6;
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}
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for (x = 0; x < cga->crtc[1]; x++)
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{
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dat = (cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000)] << 8) | cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000) + 1];
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cga->ma++;
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for (c = 0; c < 8; c++)
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{
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buffer->line[cga->displine][(x << 4) + (c << 1) + 8] =
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buffer->line[cga->displine][(x << 4) + (c << 1) + 1 + 8] = cols[dat >> 14];
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dat <<= 2;
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}
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}
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}
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else
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{
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cols[0] = 0; cols[1] = (cga->cgacol & 15) + 16;
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for (x = 0; x < cga->crtc[1]; x++)
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{
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dat = (cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000)] << 8) | cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000) + 1];
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cga->ma++;
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for (c = 0; c < 16; c++)
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{
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buffer->line[cga->displine][(x << 4) + c + 8] = cols[dat >> 15];
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dat <<= 1;
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}
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}
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}
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}
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else
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{
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cols[0] = ((cga->cgamode & 0x12) == 0x12) ? 0 : (cga->cgacol & 15) + 16;
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if (cga->cgamode & 1) hline(buffer, 0, cga->displine, (cga->crtc[1] << 3) + 16, cols[0]);
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else hline(buffer, 0, cga->displine, (cga->crtc[1] << 4) + 16, cols[0]);
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}
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if (cga->cgamode & 1) x = (cga->crtc[1] << 3) + 16;
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else x = (cga->crtc[1] << 4) + 16;
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if (cga->composite)
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{
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for (c = 0; c < x; c++)
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buffer32->line[cga->displine][c] = buffer->line[cga->displine][c] & 0xf;
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Composite_Process(cga->cgamode, 0, x >> 2, buffer32->line[cga->displine]);
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}
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cga->sc = oldsc;
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if (cga->vc == cga->crtc[7] && !cga->sc)
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cga->cgastat |= 8;
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cga->displine++;
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if (cga->displine >= 360)
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cga->displine = 0;
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}
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else
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{
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cga->vidtime += cga->dispontime;
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cga->linepos = 0;
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if (cga->vsynctime)
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{
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cga->vsynctime--;
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if (!cga->vsynctime)
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cga->cgastat &= ~8;
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}
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if (cga->sc == (cga->crtc[11] & 31) || ((cga->crtc[8] & 3) == 3 && cga->sc == ((cga->crtc[11] & 31) >> 1)))
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{
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cga->con = 0;
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cga->coff = 1;
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}
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if ((cga->crtc[8] & 3) == 3 && cga->sc == (cga->crtc[9] >> 1))
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cga->maback = cga->ma;
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if (cga->vadj)
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{
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cga->sc++;
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cga->sc &= 31;
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cga->ma = cga->maback;
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cga->vadj--;
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if (!cga->vadj)
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{
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cga->cgadispon = 1;
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cga->ma = cga->maback = (cga->crtc[13] | (cga->crtc[12] << 8)) & 0x3fff;
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cga->sc = 0;
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}
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}
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else if (cga->sc == cga->crtc[9])
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{
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cga->maback = cga->ma;
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cga->sc = 0;
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oldvc = cga->vc;
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cga->vc++;
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cga->vc &= 127;
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if (cga->vc == cga->crtc[6])
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cga->cgadispon = 0;
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if (oldvc == cga->crtc[4])
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{
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cga->vc = 0;
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cga->vadj = cga->crtc[5];
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if (!cga->vadj) cga->cgadispon = 1;
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if (!cga->vadj) cga->ma = cga->maback = (cga->crtc[13] | (cga->crtc[12] << 8)) & 0x3fff;
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if ((cga->crtc[10] & 0x60) == 0x20) cga->cursoron = 0;
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else cga->cursoron = cga->cgablink & 8;
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}
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if (cga->vc == cga->crtc[7])
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{
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cga->cgadispon = 0;
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cga->displine = 0;
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cga->vsynctime = 16;
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if (cga->crtc[7])
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{
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if (cga->cgamode & 1) x = (cga->crtc[1] << 3) + 16;
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else x = (cga->crtc[1] << 4) + 16;
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cga->lastline++;
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if (x != xsize || (cga->lastline - cga->firstline) != ysize)
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{
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xsize = x;
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ysize = cga->lastline - cga->firstline;
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if (xsize < 64) xsize = 656;
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if (ysize < 32) ysize = 200;
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updatewindowsize(xsize, (ysize << 1) + 16);
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}
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if (cga->composite)
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video_blit_memtoscreen(0, cga->firstline - 4, 0, (cga->lastline - cga->firstline) + 8, xsize, (cga->lastline - cga->firstline) + 8);
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else
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video_blit_memtoscreen_8(0, cga->firstline - 4, xsize, (cga->lastline - cga->firstline) + 8);
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frames++;
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video_res_x = xsize - 16;
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video_res_y = ysize;
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if (cga->cgamode & 1)
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{
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video_res_x /= 8;
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video_res_y /= cga->crtc[9] + 1;
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video_bpp = 0;
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}
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else if (!(cga->cgamode & 2))
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{
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video_res_x /= 16;
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video_res_y /= cga->crtc[9] + 1;
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video_bpp = 0;
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}
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else if (!(cga->cgamode & 16))
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{
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video_res_x /= 2;
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video_bpp = 2;
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}
|
|
else
|
|
{
|
|
video_bpp = 1;
|
|
}
|
|
}
|
|
cga->firstline = 1000;
|
|
cga->lastline = 0;
|
|
cga->cgablink++;
|
|
cga->oddeven ^= 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
cga->sc++;
|
|
cga->sc &= 31;
|
|
cga->ma = cga->maback;
|
|
}
|
|
if (cga->cgadispon)
|
|
cga->cgastat &= ~1;
|
|
if ((cga->sc == (cga->crtc[10] & 31) || ((cga->crtc[8] & 3) == 3 && cga->sc == ((cga->crtc[10] & 31) >> 1))))
|
|
cga->con = 1;
|
|
if (cga->cgadispon && (cga->cgamode & 1))
|
|
{
|
|
for (x = 0; x < (cga->crtc[1] << 1); x++)
|
|
cga->charbuffer[x] = cga->vram[(((cga->ma << 1) + x) & 0x3fff)];
|
|
}
|
|
}
|
|
}
|
|
|
|
void cga_init(cga_t *cga)
|
|
{
|
|
cga->composite = 0;
|
|
}
|
|
|
|
void *cga_standalone_init()
|
|
{
|
|
int display_type;
|
|
cga_t *cga = malloc(sizeof(cga_t));
|
|
memset(cga, 0, sizeof(cga_t));
|
|
|
|
display_type = device_get_config_int("display_type");
|
|
cga->composite = (display_type != CGA_RGB);
|
|
cga->revision = device_get_config_int("composite_type");
|
|
cga->snow_enabled = device_get_config_int("snow_enabled");
|
|
|
|
cga->vram = malloc(0x4000);
|
|
|
|
cga_comp_init(cga->revision);
|
|
timer_add(cga_poll, &cga->vidtime, TIMER_ALWAYS_ENABLED, cga);
|
|
mem_mapping_add(&cga->mapping, 0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL, NULL, 0, cga);
|
|
io_sethandler(0x03d0, 0x0010, cga_in, NULL, NULL, cga_out, NULL, NULL, cga);
|
|
|
|
overscan_x = overscan_y = 16;
|
|
|
|
return cga;
|
|
}
|
|
|
|
void cga_close(void *p)
|
|
{
|
|
cga_t *cga = (cga_t *)p;
|
|
|
|
free(cga->vram);
|
|
free(cga);
|
|
}
|
|
|
|
void cga_speed_changed(void *p)
|
|
{
|
|
cga_t *cga = (cga_t *)p;
|
|
|
|
cga_recalctimings(cga);
|
|
}
|
|
|
|
static device_config_t cga_config[] =
|
|
{
|
|
{
|
|
.name = "display_type",
|
|
.description = "Display type",
|
|
.type = CONFIG_SELECTION,
|
|
.selection =
|
|
{
|
|
{
|
|
.description = "RGB",
|
|
.value = CGA_RGB
|
|
},
|
|
{
|
|
.description = "Composite",
|
|
.value = CGA_COMPOSITE
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
},
|
|
.default_int = CGA_RGB
|
|
},
|
|
{
|
|
.name = "composite_type",
|
|
.description = "Composite type",
|
|
.type = CONFIG_SELECTION,
|
|
.selection =
|
|
{
|
|
{
|
|
.description = "Old",
|
|
.value = COMPOSITE_OLD
|
|
},
|
|
{
|
|
.description = "New",
|
|
.value = COMPOSITE_NEW
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
},
|
|
.default_int = COMPOSITE_OLD
|
|
},
|
|
{
|
|
.name = "snow_enabled",
|
|
.description = "Snow emulation",
|
|
.type = CONFIG_BINARY,
|
|
.default_int = 1
|
|
},
|
|
{
|
|
.type = -1
|
|
}
|
|
};
|
|
|
|
device_t cga_device =
|
|
{
|
|
"CGA",
|
|
0,
|
|
cga_standalone_init,
|
|
cga_close,
|
|
NULL,
|
|
cga_speed_changed,
|
|
NULL,
|
|
NULL,
|
|
cga_config
|
|
};
|