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Ported NCR PC4i from PCem.

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Implemented NCR NGA (640x400 extended CGA) graphic card.
This commit is contained in:
EngiNerd89
2020-12-08 18:33:20 +01:00
parent 9daf161aee
commit 901a75bb5d
11 changed files with 792 additions and 30 deletions
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11
src/video/vid_ogc.c
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@@ -130,10 +130,12 @@ ogc_in(uint16_t addr, void *priv)
* bit 0: high during retrace (CGA standard)
*/
ret = cga_in(addr, &ogc->cga);
ret = ret | 0xe0;
if (ogc->mono_display)
ret = ret | 0x10;
break;
if (addr == 0x3da){
ret = ret | 0xe0;
if (ogc->mono_display)
ret = ret | 0x10;
break;
}
}
return(ret);
@@ -425,6 +427,7 @@ ogc_poll(void *priv)
ogc->cga.ma = ogc->cga.maback = (ogc->cga.crtc[13] | (ogc->cga.crtc[12] << 8)) & 0x3fff;
ogc->cga.sc = 0;
}
// potrebbe dare problemi con composito
} else if (ogc->cga.sc == ogc->cga.crtc[9] || ((ogc->cga.crtc[8] & 3) == 3 && ogc->cga.sc == (ogc->cga.crtc[9] >> 1))) {
ogc->cga.maback = ogc->cga.ma;
ogc->cga.sc = 0;