2ca4ead570
Misc ViRGE fixes. Changes to memory mapping. Changes to PCI handling. Disabled 'AMI WinBIOS 486 PCI' due to incomplete chipset emulation. Invalid GUS register reads no longer kill the emulator.
492 lines
23 KiB
C
492 lines
23 KiB
C
/*Olivetti M24 video emulation
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Essentially double-res CGA*/
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#include <stdlib.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_olivetti_m24.h"
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typedef struct m24_t
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{
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mem_mapping_t mapping;
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uint8_t crtc[32];
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int crtcreg;
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uint8_t *vram;
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uint8_t charbuffer[256];
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uint8_t ctrl;
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uint32_t base;
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uint8_t cgamode, cgacol;
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uint8_t stat;
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int linepos, displine;
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int sc, vc;
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int con, coff, cursoron, blink;
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int vsynctime, vadj;
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int lineff;
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uint16_t ma, maback;
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int dispon;
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int dispontime, dispofftime, vidtime;
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int firstline, lastline;
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} m24_t;
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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 m24_recalctimings(m24_t *m24);
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void m24_out(uint16_t addr, uint8_t val, void *p)
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{
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m24_t *m24 = (m24_t *)p;
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uint8_t old;
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// pclog("m24_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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m24->crtcreg = val & 31;
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return;
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case 0x3d5:
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old = m24->crtc[m24->crtcreg];
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m24->crtc[m24->crtcreg] = val & crtcmask[m24->crtcreg];
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if (old != val)
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{
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if (m24->crtcreg < 0xe || m24->crtcreg > 0x10)
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{
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fullchange = changeframecount;
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m24_recalctimings(m24);
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}
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}
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return;
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case 0x3d8:
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m24->cgamode = val;
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return;
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case 0x3d9:
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m24->cgacol = val;
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return;
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case 0x3de:
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m24->ctrl = val;
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m24->base = (val & 0x08) ? 0x4000 : 0;
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return;
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}
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}
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uint8_t m24_in(uint16_t addr, void *p)
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{
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m24_t *m24 = (m24_t *)p;
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switch (addr)
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{
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case 0x3d4:
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return m24->crtcreg;
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case 0x3d5:
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return m24->crtc[m24->crtcreg];
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case 0x3da:
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return m24->stat;
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}
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return 0xff;
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}
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void m24_write(uint32_t addr, uint8_t val, void *p)
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{
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m24_t *m24 = (m24_t *)p;
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m24->vram[addr & 0x7FFF]=val;
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m24->charbuffer[ ((int)(((m24->dispontime - m24->vidtime) * 2) / (CGACONST / 2))) & 0xfc] = val;
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m24->charbuffer[(((int)(((m24->dispontime - m24->vidtime) * 2) / (CGACONST / 2))) & 0xfc) | 1] = val;
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}
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uint8_t m24_read(uint32_t addr, void *p)
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{
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m24_t *m24 = (m24_t *)p;
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return m24->vram[addr & 0x7FFF];
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}
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void m24_recalctimings(m24_t *m24)
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{
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double _dispontime, _dispofftime, disptime;
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if (m24->cgamode & 1)
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{
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disptime = m24->crtc[0] + 1;
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_dispontime = m24->crtc[1];
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}
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else
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{
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disptime = (m24->crtc[0] + 1) << 1;
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_dispontime = m24->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 / 2;
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_dispofftime *= CGACONST / 2;
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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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m24->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
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m24->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
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}
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void m24_poll(void *p)
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{
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m24_t *m24 = (m24_t *)p;
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uint16_t ca = (m24->crtc[15] | (m24->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, dat2;
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int cols[4];
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int col;
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int oldsc;
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if (!m24->linepos)
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{
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// pclog("Line poll %i %i %i %i - %04X %i %i %i\n", m24_lineff, vc, sc, vadj, ma, firstline, lastline, displine);
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m24->vidtime += m24->dispofftime;
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m24->stat |= 1;
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m24->linepos = 1;
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oldsc = m24->sc;
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if ((m24->crtc[8] & 3) == 3)
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m24->sc = (m24->sc << 1) & 7;
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if (m24->dispon)
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{
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pclog("dispon %i\n", m24->linepos);
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if (m24->displine < m24->firstline)
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{
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m24->firstline = m24->displine;
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// printf("Firstline %i\n",firstline);
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}
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m24->lastline = m24->displine;
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for (c = 0; c < 8; c++)
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{
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if ((m24->cgamode & 0x12) == 0x12)
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{
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buffer->line[m24->displine][c] = 0;
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if (m24->cgamode & 1) buffer->line[m24->displine][c + (m24->crtc[1] << 3) + 8] = 0;
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else buffer->line[m24->displine][c + (m24->crtc[1] << 4) + 8] = 0;
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}
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else
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{
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buffer->line[m24->displine][c] = (m24->cgacol & 15) + 16;
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if (m24->cgamode & 1) buffer->line[m24->displine][c + (m24->crtc[1] << 3) + 8] = (m24->cgacol & 15) + 16;
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else buffer->line[m24->displine][c + (m24->crtc[1] << 4) + 8] = (m24->cgacol & 15) + 16;
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}
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}
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if (m24->cgamode & 1)
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{
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for (x = 0; x < m24->crtc[1]; x++)
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{
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chr = m24->charbuffer[ x << 1];
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attr = m24->charbuffer[(x << 1) + 1];
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drawcursor = ((m24->ma == ca) && m24->con && m24->cursoron);
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if (m24->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 ((m24->blink & 16) && (attr & 0x80) && !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[m24->displine][(x << 3) + c + 8] = cols[(fontdatm[chr][((m24->sc & 7) << 1) | m24->lineff] & (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[m24->displine][(x << 3) + c + 8] = cols[(fontdatm[chr][((m24->sc & 7) << 1) | m24->lineff] & (1 << (c ^ 7))) ? 1 : 0];
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}
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m24->ma++;
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}
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}
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else if (!(m24->cgamode & 2))
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{
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for (x = 0; x < m24->crtc[1]; x++)
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{
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chr = m24->vram[((m24->ma << 1) & 0x3fff) + m24->base];
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attr = m24->vram[(((m24->ma << 1) + 1) & 0x3fff) + m24->base];
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drawcursor = ((m24->ma == ca) && m24->con && m24->cursoron);
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if (m24->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 ((m24->blink & 16) && (attr & 0x80))
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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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m24->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[m24->displine][(x << 4) + (c << 1) + 8] =
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buffer->line[m24->displine][(x << 4) + (c << 1) + 1 + 8] = cols[(fontdatm[chr][((m24->sc & 7) << 1) | m24->lineff] & (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[m24->displine][(x << 4) + (c << 1) + 8] =
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buffer->line[m24->displine][(x << 4) + (c << 1) + 1 + 8] = cols[(fontdatm[chr][((m24->sc & 7) << 1) | m24->lineff] & (1 << (c ^ 7))) ? 1 : 0];
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}
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}
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}
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else if (!(m24->cgamode & 16))
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{
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cols[0] = (m24->cgacol & 15) | 16;
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col = (m24->cgacol & 16) ? 24 : 16;
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if (m24->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 (m24->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 < m24->crtc[1]; x++)
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{
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dat = (m24->vram[((m24->ma << 1) & 0x1fff) + ((m24->sc & 1) * 0x2000) + m24->base] << 8) |
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m24->vram[((m24->ma << 1) & 0x1fff) + ((m24->sc & 1) * 0x2000) + 1 + m24->base];
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m24->ma++;
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for (c = 0; c < 8; c++)
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{
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buffer->line[m24->displine][(x << 4) + (c << 1) + 8] =
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buffer->line[m24->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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if (m24->ctrl & 1)
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{
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dat2 = ((m24->sc & 1) * 0x4000) | (m24->lineff * 0x2000);
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cols[0] = 0; cols[1] = /*(m24->cgacol & 15)*/15 + 16;
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}
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else
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{
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dat2 = (m24->sc & 1) * 0x2000;
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cols[0] = 0; cols[1] = (m24->cgacol & 15) + 16;
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}
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for (x = 0; x < m24->crtc[1]; x++)
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{
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dat = (m24->vram[((m24->ma << 1) & 0x1fff) + dat2] << 8) | m24->vram[((m24->ma << 1) & 0x1fff) + dat2 + 1];
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m24->ma++;
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for (c = 0; c < 16; c++)
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{
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buffer->line[m24->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] = ((m24->cgamode & 0x12) == 0x12) ? 0 : (m24->cgacol & 15) + 16;
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if (m24->cgamode & 1) hline(buffer, 0, m24->displine, (m24->crtc[1] << 3) + 16, cols[0]);
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else hline(buffer, 0, m24->displine, (m24->crtc[1] << 4) + 16, cols[0]);
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}
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if (m24->cgamode & 1) x = (m24->crtc[1] << 3) + 16;
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else x = (m24->crtc[1] << 4) + 16;
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m24->sc = oldsc;
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if (m24->vc == m24->crtc[7] && !m24->sc)
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m24->stat |= 8;
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m24->displine++;
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if (m24->displine >= 720) m24->displine = 0;
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}
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else
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{
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// pclog("Line poll %i %i %i %i\n", m24_lineff, vc, sc, vadj);
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m24->vidtime += m24->dispontime;
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if (m24->dispon) m24->stat &= ~1;
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m24->linepos = 0;
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m24->lineff ^= 1;
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if (m24->lineff)
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{
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m24->ma = m24->maback;
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}
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else
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{
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if (m24->vsynctime)
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{
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m24->vsynctime--;
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if (!m24->vsynctime)
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m24->stat &= ~8;
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}
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if (m24->sc == (m24->crtc[11] & 31) || ((m24->crtc[8] & 3) == 3 && m24->sc == ((m24->crtc[11] & 31) >> 1)))
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{
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m24->con = 0;
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m24->coff = 1;
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}
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if (m24->vadj)
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{
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m24->sc++;
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m24->sc &= 31;
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m24->ma = m24->maback;
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m24->vadj--;
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if (!m24->vadj)
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{
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m24->dispon = 1;
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m24->ma = m24->maback = (m24->crtc[13] | (m24->crtc[12] << 8)) & 0x3fff;
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m24->sc = 0;
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}
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}
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else if (m24->sc == m24->crtc[9] || ((m24->crtc[8] & 3) == 3 && m24->sc == (m24->crtc[9] >> 1)))
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{
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m24->maback = m24->ma;
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m24->sc = 0;
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oldvc = m24->vc;
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m24->vc++;
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m24->vc &= 127;
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if (m24->vc == m24->crtc[6])
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m24->dispon=0;
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if (oldvc == m24->crtc[4])
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{
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m24->vc = 0;
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m24->vadj = m24->crtc[5];
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if (!m24->vadj) m24->dispon = 1;
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if (!m24->vadj) m24->ma = m24->maback = (m24->crtc[13] | (m24->crtc[12] << 8)) & 0x3fff;
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if ((m24->crtc[10] & 0x60) == 0x20) m24->cursoron = 0;
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else m24->cursoron = m24->blink & 16;
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}
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if (m24->vc == m24->crtc[7])
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{
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m24->dispon = 0;
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m24->displine = 0;
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m24->vsynctime = (m24->crtc[3] >> 4) + 1;
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if (m24->crtc[7])
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{
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if (m24->cgamode & 1) x = (m24->crtc[1] << 3) + 16;
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else x = (m24->crtc[1] << 4) + 16;
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m24->lastline++;
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if (x != xsize || (m24->lastline - m24->firstline) != ysize)
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{
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xsize = x;
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ysize = m24->lastline - m24->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 + 16);
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}
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startblit();
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pclog("m24 blit %i %i\n", m24->firstline, m24->lastline);
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video_blit_memtoscreen_8(0, m24->firstline - 8, xsize, (m24->lastline - m24->firstline) + 16);
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if (readflash) rectfill(screen, winsizex - 40, 8, winsizex - 8, 14, 0xFFFFFFFF);
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readflash = 0;
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frames++;
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endblit();
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video_res_x = xsize - 16;
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video_res_y = ysize;
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if (m24->cgamode & 1)
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{
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video_res_x /= 8;
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video_res_y /= (m24->crtc[9] + 1) * 2;
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video_bpp = 0;
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}
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else if (!(m24->cgamode & 2))
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{
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video_res_x /= 16;
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video_res_y /= (m24->crtc[9] + 1) * 2;
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video_bpp = 0;
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}
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else if (!(m24->cgamode & 16))
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{
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video_res_x /= 2;
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video_res_y /= 2;
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video_bpp = 2;
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}
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else if (!(m24->ctrl & 1))
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{
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video_res_y /= 2;
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video_bpp = 1;
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}
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}
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m24->firstline = 1000;
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m24->lastline = 0;
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m24->blink++;
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}
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}
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else
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{
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m24->sc++;
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m24->sc &= 31;
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m24->ma = m24->maback;
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}
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if ((m24->sc == (m24->crtc[10] & 31) || ((m24->crtc[8] & 3) == 3 && m24->sc == ((m24->crtc[10] & 31) >> 1))))
|
|
m24->con = 1;
|
|
}
|
|
if (m24->dispon && (m24->cgamode & 1))
|
|
{
|
|
for (x = 0; x < (m24->crtc[1] << 1); x++)
|
|
m24->charbuffer[x] = m24->vram[(((m24->ma << 1) + x) & 0x3fff) + m24->base];
|
|
}
|
|
}
|
|
}
|
|
|
|
void *m24_init()
|
|
{
|
|
int c;
|
|
m24_t *m24 = malloc(sizeof(m24_t));
|
|
memset(m24, 0, sizeof(m24_t));
|
|
|
|
m24->vram = malloc(0x8000);
|
|
|
|
timer_add(m24_poll, &m24->vidtime, TIMER_ALWAYS_ENABLED, m24);
|
|
mem_mapping_add(&m24->mapping, 0xb8000, 0x08000, m24_read, NULL, NULL, m24_write, NULL, NULL, NULL, 0, m24);
|
|
io_sethandler(0x03d0, 0x0010, m24_in, NULL, NULL, m24_out, NULL, NULL, m24);
|
|
return m24;
|
|
}
|
|
|
|
void m24_close(void *p)
|
|
{
|
|
m24_t *m24 = (m24_t *)p;
|
|
|
|
free(m24->vram);
|
|
free(m24);
|
|
}
|
|
|
|
void m24_speed_changed(void *p)
|
|
{
|
|
m24_t *m24 = (m24_t *)p;
|
|
|
|
m24_recalctimings(m24);
|
|
}
|
|
|
|
device_t m24_device =
|
|
{
|
|
"Olivetti M24 (video)",
|
|
0,
|
|
m24_init,
|
|
m24_close,
|
|
NULL,
|
|
m24_speed_changed,
|
|
NULL,
|
|
NULL
|
|
};
|