1903:
1835:
1879:
1891:
1867:
42:
310:
31:
20:
322:
53:
72:
64:
145:
The hardware palette is composed of twelve colors: black, green, yellow, blue, red, buff (almost-but-not-quite white), cyan, magenta, and orange (two extra colors, dark green and dark orange, are the ink colours for all alphanumeric text mode characters, and a light orange color is available as an
1842:
Motorola offered its customers the possibility of ordering the MC6847 with the internal ROM masked with a custom pattern. The customer would provide the ROM pattern on MCM2708 or MCM2716 PROMS or on a MDOS formatted 8-inch single sided, single density floppy disk. Motorola would then send 10
1824:
The internal character rom is organized as a matrix of 64x35 (2240 bits) where each column consists of the 35 bytes (5x7) needed to form a character. The character bits are stored sequentially in column order, that is 7 bits of column 0 followed by the 7 bits of column 1, and so on.
1846:
The MC6847 also supports an external character ROM. The Dragon 200-E, a spanish variant of the Dragon 64 is a great example of this. The machine had a daughterboard that fits on the MC6847 socket and had the VDG plus a 2532 EPROM and some decoding logic.
847:
The first eight colors of this table were numbered 0 to 7 in the upper bits of the character set (when bit 7 was set, bits 4-6 represented the color number), but ColorBASIC's numbering was 1 higher than that in text mode, as it used 0 for black.
290:
According to the datasheets, there are non-interlaced (6847) and interlaced (6847Y) variants, plus the 6847T1 (non-interlaced only). The chips can be found with ceramic (L suffix), plastic (P suffix) or
2010:
2270:
843:
modes) was dark pink (or dark red) on light pink, of shades not listed here (and no dark orange), whereas the Color
Computer 3, with a different chip, made it dark orange on orange.
1338:
characters with 5x7 pixels. Characters can be green or orange, on dark green or orange background, with a possible "invert" attribute (dark character on a bright background).
1828:
The following picture shows the bits overlapped on top of the rom array, with the ones of the first character (@) in different colours to highlight the organization.
2056:
648:
624:
534:
485:
407:
384:
262:
213:
560:
511:
239:
190:
2034:
600:
440:
358:
164:
1999:
2422:
2262:
278:
The low display resolution is a necessity of using television sets as display monitors. Making the display wider risked cutting off characters due to
1940:
1972:
2131:
146:
alternative to green as the background color). According to the MC6847 datasheet, the colors are formed by the combination of three signals:
127:, among others. It is a relatively simple display generator intended for NTSC television output: capable of displaying alphanumeric text,
2241:
2394:
2156:
2106:
1878:
1902:
1857:
Here you can see the default MC6847 and MC6847T1 default character sets, the Dragon 200-E one and the Dragon 200-E daughterboard.
2181:
2220:
2329:
2081:
1890:
2358:
2052:
120:
1866:
2038:
282:. Compressing more dots into the display window would easily exceed the resolution of the television and be useless.
2449:
337:
The chip outputs a NTSC-compatible progressive scan signal composed of one field of 262 lines 60 times per second.
309:
2299:
1834:
84:
321:
2444:
124:
131:, and raster graphics contained within a roughly square display matrix 256 pixels wide by 192 lines high.
1935:
92:
1965:
2127:
1331:
56:
2245:
630:
606:
516:
467:
389:
366:
244:
195:
2152:
2102:
340:
According to the MC6847 datasheet, colors are formed by the combination of three signals:
41:
2386:
539:
490:
218:
169:
818:
1) The colors shown are adjusted for maximum brightness and only approximate (different
1925:
836:
585:
425:
343:
149:
112:
30:
19:
2177:
2438:
1919:
139:
2321:
2202:
819:
417:
128:
104:
96:
2077:
52:
2352:
2216:
840:
409:
108:
268:
116:
71:
416:
color space. These signals can drive a TV directly, or be used with a NTSC
360:
100:
839:
1 and 2, the alternate palette of text modes (actually the text portion of
142:
or colored text (green on dark green; orange on dark orange) are possible.
2006:
823:
279:
88:
45:
34:
23:
1930:
443:
2053:"Color Computer Technical Reference Manual - III THEORY OF OPERATION"
579:
292:
2291:
1335:
413:
265:
135:
70:
63:
62:
51:
40:
29:
18:
2035:"(1) History of GPU – The Consumer 3D Graphics Cards (1976-1995)"
2217:"Home computer & video game museum: APF Imagination Machine"
827:
272:
2387:"MC6847* datasheet & applicatoin notes - Datasheet Archive"
1843:
verification units for the customer to verify the ROM pattern.
1854:) had a 96 character ROM that included lowercase characters.
134:
The ROM includes a 5 x 7 pixel font, compatible with 6-bit
2103:"old-computers.com: VIDEO TECHNOLOGY > LASER 200 / 210"
2203:"Compact Vision TV Boy by Gakken – the Video Game Kraken"
1966:"MC6847/MC6847Y Video Display Generator, Motorola, 1984"
2427:. Motorola Semiconductor Products Inc. 1984. p. 3.
633:
609:
588:
542:
519:
493:
470:
428:
392:
369:
346:
247:
221:
198:
172:
152:
1994:
1992:
2354:
Graphics Using the
Motorola 6847 Integrated Circuit
2128:"old-computers.com: - TANDY RADIO SHACK > MC 10"
1344:MC6847 Character Generator Alphanumeric Characters
642:
618:
594:
577:The following table shows the signal values used:
554:
528:
505:
479:
434:
401:
378:
352:
256:
233:
207:
184:
158:
2178:"Yet another computer museum - The Acorn Atom"
2263:"Datasheet Archive MC6847 datasheet download"
8:
2424:MC6847/MC6847Y VIDEO DISPLAY GENERATOR (VDG)
632:
608:
587:
541:
518:
492:
469:
427:
391:
368:
345:
246:
220:
197:
171:
151:
16:Video display generator (VDG) by Motorola
2381:
2379:
2377:
2375:
1941:List of home computers by video hardware
1340:
858:
2257:
2255:
1960:
1958:
1956:
1952:
1859:
302:
271:, and then converted for output into a
264:with 3 possible levels), based on the
2417:
2415:
2413:
2411:
2332:from the original on 7 September 2020
2153:"old-computers.com: NEC > PC 6001"
856:Possible MC6847 video display modes:
48:MC6847T1 (XC80652) in plastic package
7:
2320:Benchoff, Brian (29 January 2016).
2244:. February 14, 2021. Archived from
14:
1850:The updated version of the chip (
420:(Motorola MC1372) for RF output.
1901:
1889:
1877:
1865:
1833:
1220:Resolution Graphics Three (RG3)
927:External Alphanumerics Inverted
917:Internal Alphanumerics Inverted
320:
308:
2397:from the original on 2022-07-10
2361:from the original on 2022-03-04
2302:from the original on 2021-02-23
2273:from the original on 2022-02-25
2223:from the original on 2022-01-16
2184:from the original on 2022-07-27
2159:from the original on 2022-08-03
2134:from the original on 2022-06-08
2109:from the original on 2022-06-08
2084:from the original on 2021-07-24
2059:from the original on 2020-01-29
2016:from the original on 2021-01-22
1978:from the original on 2019-03-16
1884:MC6847T1 Standard character set
1861:Character sets and external ROM
333:Signal levels and color palette
2242:"Semi-graphics-6 display mode"
1294:Resolution Graphics Six (RG6)
1143:Resolution Graphics Two (RG2)
1069:Resolution Graphics One (RG1)
1:
2351:Posey, Bruce Charles (1982).
562:) may be: "Output Low" = 1.0
215:with 3 possible levels) and
121:Gakken Compact Vision TV Boy
2357:. W.S.U. Printing Service.
1176:Color Graphics Three (CG3)
2466:
1908:Dragon 200-E daughterboard
1896:Dragon 200-E character set
1343:
87:(VDG) first introduced by
26:MC6847 in ceramic package.
1922:, video address generator
1288:
1250:Color Graphics Six (CG6)
1222:
1214:
1145:
1099:Color Graphics Two (CG2)
1071:
1063:
1022:Color Graphics One (CG1)
1018:
971:
911:
887:
881:
875:
861:
37:MC6847 in plastic package
2391:www.datasheetarchive.com
2267:www.datasheetarchive.com
442:may assume one of these
166:with 6 possible levels,
91:in 1978 and used in the
1019:Mode 2: Graphics Modes
922:External Alphanumerics
884:(8x12 pixel characters)
879:Internal Alphanumerics
458:and "White High" = 0.42
454:, "White Medium" = 0.54
125:APF Imagination Machine
85:Video Display Generator
2292:"Motorola VDG Colours"
1872:Standard character set
644:
643:{\displaystyle \phi B}
620:
619:{\displaystyle \phi A}
596:
570:and "Input High" = 2.0
556:
530:
529:{\displaystyle \phi B}
507:
481:
480:{\displaystyle \phi A}
436:
403:
402:{\displaystyle \phi B}
380:
379:{\displaystyle \phi A}
354:
315:MC6847 Die metal layer
258:
257:{\displaystyle \phi B}
235:
209:
208:{\displaystyle \phi A}
186:
160:
76:
68:
60:
49:
38:
27:
1936:MOS Technology VIC-II
977:Semigraphics 6 (SG6)
932:Semigraphics 4 (SG4)
645:
621:
597:
557:
531:
508:
482:
437:
404:
381:
355:
327:MC6847 Die base layer
295:(S suffix) packages.
259:
236:
210:
187:
161:
93:TRS-80 Color Computer
74:
66:
55:
44:
33:
22:
2248:on 14 February 2021.
2000:"MC6847T1 Datasheet"
876:Mode 1: Alpha Modes
631:
607:
586:
540:
517:
491:
468:
450:, "White Low" = 0.65
426:
390:
367:
344:
245:
219:
196:
170:
150:
67:Motorola 6847 Pinout
1332:character generator
1326:Character generator
835:2) At least on the
555:{\displaystyle B-Y}
506:{\displaystyle R-Y}
412:, according to the
234:{\displaystyle B-Y}
185:{\displaystyle R-Y}
652:Approximate Color
640:
616:
592:
552:
526:
503:
477:
432:
399:
376:
350:
254:
231:
205:
182:
156:
138:. Effects such as
113:NEC PC-6000 series
77:
69:
61:
50:
39:
28:
2450:Motorola products
2322:"VGA In Memoriam"
1822:
1821:
1323:
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1319:
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1245:
1212:
1168:
1135:
1094:
1061:
1014:
969:
909:
885:
844:
831:
822:are used on TV -
814:
810:
809:
595:{\displaystyle Y}
435:{\displaystyle Y}
353:{\displaystyle Y}
159:{\displaystyle Y}
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2406:
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2383:
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2250:
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2213:
2207:
2206:
2199:
2193:
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2189:
2174:
2168:
2167:
2165:
2164:
2149:
2143:
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2124:
2118:
2117:
2115:
2114:
2099:
2093:
2092:
2090:
2089:
2074:
2068:
2067:
2065:
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2043:
2042:
2037:. Archived from
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2022:
2021:
2015:
2004:
1996:
1987:
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834:
826:and web pages -
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446:: "Black" = 0.72
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275:analog signal.
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193:
168:
167:
148:
147:
75:MC6847T1 Pinout
17:
12:
11:
5:
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2447:
2445:Graphics chips
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2044:
2041:on 2023-05-28.
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1926:Thomson EF9345
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1334:ROM offers 64
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837:Color Computer
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58:
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2390:
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2353:
2346:
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2325:
2315:
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2295:
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2266:
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2236:
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2147:
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2122:
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806:Dark Orange
576:
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464:
459:
455:
451:
447:
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339:
336:
299:Die pictures
289:
277:
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133:
129:semigraphics
105:TRS-80 MC-10
97:Dragon 32/64
80:
78:
2336:2 September
2078:"Dragon 32"
865:Resolution
862:Video Mode
852:Video modes
841:semigraphic
792:Dark Green
566:, "R" = 1.5
109:Matra Alice
2439:Categories
2401:2021-05-15
2365:2020-09-16
2306:2021-05-07
2277:2022-02-25
2227:2022-06-08
2188:2022-06-08
2163:2022-06-08
2138:2022-06-08
2113:2022-06-08
2088:2022-06-08
2063:2022-06-08
2020:2022-05-15
1982:2017-08-19
1947:References
1297:256 × 192
1223:128 × 192
304:MC6847 die
269:colorspace
117:Acorn Atom
57:Mitsubishi
2296:hcvgm.org
1146:128 × 96
1072:128 × 64
635:ϕ
611:ϕ
547:−
521:ϕ
498:−
472:ϕ
418:modulator
394:ϕ
371:ϕ
361:luminance
249:ϕ
226:−
200:ϕ
177:−
101:Laser 200
2395:Archived
2359:Archived
2330:Archived
2326:Hackaday
2300:Archived
2271:Archived
2221:Archived
2182:Archived
2157:Archived
2132:Archived
2107:Archived
2082:Archived
2057:Archived
2011:Archived
2009:. 1985.
2007:Motorola
1973:Archived
1914:See also
1852:MC6847T1
1025:64 × 64
980:64 × 48
935:64 × 32
882:32 x 16
750:Magenta
444:voltages
286:Variants
280:overscan
123:and the
89:Motorola
46:Motorola
35:Motorola
24:Motorola
1931:TMS9918
868:Colors
764:Orange
680:Yellow
1738:&
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871:Bytes
813:Notes:
778:Black
666:Green
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410:chroma
293:CERDIP
81:MC6847
2014:(PDF)
2003:(PDF)
1976:(PDF)
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