1914:
1846:
1890:
1902:
1878:
53:
321:
42:
31:
333:
64:
83:
75:
156:
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
1853:
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
1835:
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.
1857:
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.
858:
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.
301:
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
2021:
2281:
854:
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.
1349:
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).
1839:
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.
2067:
659:
635:
545:
496:
418:
395:
273:
224:
571:
522:
250:
201:
2045:
611:
451:
369:
175:
2010:
2433:
2273:
289:
The low display resolution is a necessity of using television sets as display monitors. Making the display wider risked cutting off characters due to
1951:
1983:
2142:
157:
alternative to green as the background color). According to the MC6847 datasheet, the colors are formed by the combination of three signals:
138:, among others. It is a relatively simple display generator intended for NTSC television output: capable of displaying alphanumeric text,
2252:
2405:
2167:
2117:
1889:
1913:
1868:
Here you can see the default MC6847 and MC6847T1 default character sets, the Dragon 200-E one and the Dragon 200-E daughterboard.
2192:
2231:
2340:
2092:
1901:
2369:
2063:
131:
1877:
2049:
293:. Compressing more dots into the display window would easily exceed the resolution of the television and be useless.
2460:
348:
The chip outputs a NTSC-compatible progressive scan signal composed of one field of 262 lines 60 times per second.
320:
2310:
1845:
95:
332:
2455:
135:
142:, and raster graphics contained within a roughly square display matrix 256 pixels wide by 192 lines high.
1946:
103:
1976:
2138:
1342:
67:
2256:
641:
617:
527:
478:
400:
377:
255:
206:
2163:
2113:
351:
According to the MC6847 datasheet, colors are formed by the combination of three signals:
52:
2397:
550:
501:
229:
180:
829:
1) The colors shown are adjusted for maximum brightness and only approximate (different
1936:
847:
596:
436:
354:
160:
123:
41:
30:
2188:
2449:
1930:
150:
2332:
2213:
830:
428:
139:
115:
107:
2088:
63:
2363:
2227:
851:
420:
119:
279:
127:
82:
427:
color space. These signals can drive a TV directly, or be used with a NTSC
371:
111:
850:
1 and 2, the alternate palette of text modes (actually the text portion of
153:
or colored text (green on dark green; orange on dark orange) are possible.
2017:
834:
290:
99:
56:
45:
34:
1941:
454:
17:
2064:"Color Computer Technical Reference Manual - III THEORY OF OPERATION"
590:
303:
2302:
1346:
424:
276:
146:
81:
74:
73:
62:
51:
40:
29:
2046:"(1) History of GPU – The Consumer 3D Graphics Cards (1976-1995)"
2228:"Home computer & video game museum: APF Imagination Machine"
838:
283:
2398:"MC6847* datasheet & applicatoin notes - Datasheet Archive"
1854:
verification units for the customer to verify the ROM pattern.
1865:) had a 96 character ROM that included lowercase characters.
145:
The ROM includes a 5 x 7 pixel font, compatible with 6-bit
2114:"old-computers.com: VIDEO TECHNOLOGY > LASER 200 / 210"
2214:"Compact Vision TV Boy by Gakken – the Video Game Kraken"
1977:"MC6847/MC6847Y Video Display Generator, Motorola, 1984"
2438:. Motorola Semiconductor Products Inc. 1984. p. 3.
644:
620:
599:
553:
530:
504:
481:
439:
403:
380:
357:
258:
232:
209:
183:
163:
2005:
2003:
2365:
Graphics Using the
Motorola 6847 Integrated Circuit
2139:"old-computers.com: - TANDY RADIO SHACK > MC 10"
1355:MC6847 Character Generator Alphanumeric Characters
653:
629:
605:
588:The following table shows the signal values used:
565:
539:
516:
490:
445:
412:
389:
363:
267:
244:
218:
195:
169:
2189:"Yet another computer museum - The Acorn Atom"
2274:"Datasheet Archive MC6847 datasheet download"
8:
2435:MC6847/MC6847Y VIDEO DISPLAY GENERATOR (VDG)
643:
619:
598:
552:
529:
503:
480:
438:
402:
379:
356:
257:
231:
208:
182:
162:
27:Video display generator (VDG) by Motorola
2392:
2390:
2388:
2386:
1952:List of home computers by video hardware
1351:
869:
2268:
2266:
1971:
1969:
1967:
1963:
1870:
313:
282:, and then converted for output into a
275:with 3 possible levels), based on the
2428:
2426:
2424:
2422:
2343:from the original on 7 September 2020
2164:"old-computers.com: NEC > PC 6001"
867:Possible MC6847 video display modes:
59:MC6847T1 (XC80652) in plastic package
7:
2331:Benchoff, Brian (29 January 2016).
2255:. February 14, 2021. Archived from
25:
1861:The updated version of the chip (
431:(Motorola MC1372) for RF output.
1912:
1900:
1888:
1876:
1844:
1231:Resolution Graphics Three (RG3)
938:External Alphanumerics Inverted
928:Internal Alphanumerics Inverted
331:
319:
2408:from the original on 2022-07-10
2372:from the original on 2022-03-04
2313:from the original on 2021-02-23
2284:from the original on 2022-02-25
2234:from the original on 2022-01-16
2195:from the original on 2022-07-27
2170:from the original on 2022-08-03
2145:from the original on 2022-06-08
2120:from the original on 2022-06-08
2095:from the original on 2021-07-24
2070:from the original on 2020-01-29
2027:from the original on 2021-01-22
1989:from the original on 2019-03-16
1895:MC6847T1 Standard character set
1872:Character sets and external ROM
344:Signal levels and color palette
2253:"Semi-graphics-6 display mode"
1305:Resolution Graphics Six (RG6)
1154:Resolution Graphics Two (RG2)
1080:Resolution Graphics One (RG1)
1:
2362:Posey, Bruce Charles (1982).
573:) may be: "Output Low" = 1.0
226:with 3 possible levels) and
132:Gakken Compact Vision TV Boy
2368:. W.S.U. Printing Service.
1187:Color Graphics Three (CG3)
2477:
1919:Dragon 200-E daughterboard
1907:Dragon 200-E character set
1354:
98:(VDG) first introduced by
37:MC6847 in ceramic package.
1933:, video address generator
1299:
1261:Color Graphics Six (CG6)
1233:
1225:
1156:
1110:Color Graphics Two (CG2)
1082:
1074:
1033:Color Graphics One (CG1)
1029:
982:
922:
898:
892:
886:
872:
48:MC6847 in plastic package
2402:www.datasheetarchive.com
2278:www.datasheetarchive.com
453:may assume one of these
177:with 6 possible levels,
102:in 1978 and used in the
1030:Mode 2: Graphics Modes
933:External Alphanumerics
895:(8x12 pixel characters)
890:Internal Alphanumerics
469:and "White High" = 0.42
465:, "White Medium" = 0.54
136:APF Imagination Machine
96:Video Display Generator
2303:"Motorola VDG Colours"
1883:Standard character set
655:
654:{\displaystyle \phi B}
631:
630:{\displaystyle \phi A}
607:
581:and "Input High" = 2.0
567:
541:
540:{\displaystyle \phi B}
518:
492:
491:{\displaystyle \phi A}
447:
414:
413:{\displaystyle \phi B}
391:
390:{\displaystyle \phi A}
365:
326:MC6847 Die metal layer
269:
268:{\displaystyle \phi B}
246:
220:
219:{\displaystyle \phi A}
197:
171:
87:
79:
71:
60:
49:
38:
1947:MOS Technology VIC-II
988:Semigraphics 6 (SG6)
943:Semigraphics 4 (SG4)
656:
632:
608:
568:
542:
519:
493:
448:
415:
392:
366:
338:MC6847 Die base layer
306:(S suffix) packages.
270:
247:
221:
198:
172:
104:TRS-80 Color Computer
85:
77:
66:
55:
44:
33:
2259:on 14 February 2021.
2011:"MC6847T1 Datasheet"
887:Mode 1: Alpha Modes
642:
618:
597:
551:
528:
502:
479:
461:, "White Low" = 0.65
437:
401:
378:
355:
256:
230:
207:
181:
161:
78:Motorola 6847 Pinout
1343:character generator
1337:Character generator
846:2) At least on the
566:{\displaystyle B-Y}
517:{\displaystyle R-Y}
423:, according to the
245:{\displaystyle B-Y}
196:{\displaystyle R-Y}
663:Approximate Color
651:
627:
603:
563:
537:
514:
488:
443:
410:
387:
361:
265:
242:
216:
193:
167:
149:. Effects such as
124:NEC PC-6000 series
88:
80:
72:
61:
50:
39:
2461:Motorola products
2333:"VGA In Memoriam"
1833:
1832:
1334:
1333:
1330:
1297:
1256:
1223:
1179:
1146:
1105:
1072:
1025:
980:
920:
896:
855:
842:
833:are used on TV -
825:
821:
820:
606:{\displaystyle Y}
446:{\displaystyle Y}
364:{\displaystyle Y}
170:{\displaystyle Y}
16:(Redirected from
2468:
2440:
2439:
2430:
2417:
2416:
2414:
2413:
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2359:
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2348:
2328:
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2321:
2319:
2318:
2299:
2293:
2292:
2290:
2289:
2270:
2261:
2260:
2249:
2243:
2242:
2240:
2239:
2224:
2218:
2217:
2210:
2204:
2203:
2201:
2200:
2185:
2179:
2178:
2176:
2175:
2160:
2154:
2153:
2151:
2150:
2135:
2129:
2128:
2126:
2125:
2110:
2104:
2103:
2101:
2100:
2085:
2079:
2078:
2076:
2075:
2060:
2054:
2053:
2048:. Archived from
2042:
2036:
2035:
2033:
2032:
2026:
2015:
2007:
1998:
1997:
1995:
1994:
1988:
1981:
1973:
1916:
1904:
1892:
1880:
1848:
1352:
1327:
1320:
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1312:
1294:
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1199:
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962:
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956:
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917:
914:
908:
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894:
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845:
837:and web pages -
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489:
457:: "Black" = 0.72
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2057:
2044:
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2030:
2028:
2024:
2013:
2009:
2008:
2001:
1992:
1990:
1986:
1979:
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1965:
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1927:
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312:
299:
286:analog signal.
254:
253:
228:
227:
205:
204:
179:
178:
159:
158:
86:MC6847T1 Pinout
28:
23:
22:
15:
12:
11:
5:
2474:
2472:
2464:
2463:
2458:
2456:Graphics chips
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2205:
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2105:
2080:
2055:
2052:on 2023-05-28.
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1937:Thomson EF9345
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1345:ROM offers 64
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861:
848:Color Computer
819:
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151:inverse video
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70:clone M5C6847
69:
65:
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47:
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2401:
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2364:
2357:
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2336:
2326:
2315:. Retrieved
2306:
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2286:. Retrieved
2277:
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2247:
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2222:
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2183:
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2158:
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2133:
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2108:
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2083:
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2058:
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1867:
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1860:
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827:
822:
817:Dark Orange
587:
582:
578:
574:
475:
470:
466:
462:
458:
433:
350:
347:
310:Die pictures
300:
288:
155:
144:
140:semigraphics
116:TRS-80 MC-10
108:Dragon 32/64
91:
89:
2347:2 September
2089:"Dragon 32"
876:Resolution
873:Video Mode
863:Video modes
852:semigraphic
803:Dark Green
577:, "R" = 1.5
120:Matra Alice
2450:Categories
2412:2021-05-15
2376:2020-09-16
2317:2021-05-07
2288:2022-02-25
2238:2022-06-08
2199:2022-06-08
2174:2022-06-08
2149:2022-06-08
2124:2022-06-08
2099:2022-06-08
2074:2022-06-08
2031:2022-05-15
1993:2017-08-19
1958:References
1308:256 × 192
1234:128 × 192
315:MC6847 die
280:colorspace
128:Acorn Atom
68:Mitsubishi
2307:hcvgm.org
1157:128 × 96
1083:128 × 64
646:ϕ
622:ϕ
558:−
532:ϕ
509:−
483:ϕ
429:modulator
405:ϕ
382:ϕ
372:luminance
260:ϕ
237:−
211:ϕ
188:−
112:Laser 200
2406:Archived
2370:Archived
2341:Archived
2337:Hackaday
2311:Archived
2282:Archived
2232:Archived
2193:Archived
2168:Archived
2143:Archived
2118:Archived
2093:Archived
2068:Archived
2022:Archived
2020:. 1985.
2018:Motorola
1984:Archived
1925:See also
1863:MC6847T1
1036:64 × 64
991:64 × 48
946:64 × 32
893:32 x 16
761:Magenta
455:voltages
297:Variants
291:overscan
134:and the
100:Motorola
57:Motorola
46:Motorola
35:Motorola
1942:TMS9918
879:Colors
775:Orange
691:Yellow
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882:Bytes
824:Notes:
789:Black
677:Green
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421:chroma
304:CERDIP
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1987:(PDF)
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