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IBM Monochrome Display Adapter

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38: 219: 651: 638:, which was impossible at the low resolution of CGA or the fixed character set of MDA. It could address individual pixels, and displayed a black and white picture of 720 × 348 pixels. This resolution was superior to the CGA card, yet offered pixel-addressable graphics, so despite lacking color capability, the Hercules adapter's offer of high resolution bitmap graphics combined with MDA-grade text quality made it a popular choice, which was even shipped with many 1293: 557: 786: 1301: 493: 615:
more popular than CGA for business applications. The higher resolution of MDA's text and inclusion of a printer port made it more appealing for the business applications that were the focus of the original PC. However, dissatisfaction with its limitations quickly led to third parties releasing competing hardware.
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The author of an internal IBM publication stated in October 1981 that he had planned to purchase the CGA adapter but changed his mind after seeing its poor display quality. Describing MDA as beautiful, he observed that "you stare at text a whole lot more than you stare at color graphics". MDA was
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characters from (32-126), and the 33 ASCII control codes (0-31 and 127) are replaced with printable graphic symbols. It also includes another 128 characters (128-255) like the aforementioned characters for drawing forms. Some of these shapes appear in Unicode as
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of the MDA is 720 × 350 pixels, if the dimensions of all character cells are added up, but the MDA cannot address individual pixels to take full advantage of this resolution. Each character cell can be set to one of 256 bitmap characters stored in
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pins, theoretically allowing an 8-color display with a suitable monitor. The registers also allow the monochrome mode to be set on and off. No (widely) published software exists to actually control the feature.
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and the Windows debugger permitted the simultaneous use of an MDA and another graphics card, with the MDA displaying a debugger interface while the other card was showing the primary display.
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swaps the foreground and background colors, while blinking causes text to flash periodically. Some of these attributes can be combined, so that e.g. bright, underlined text can be rendered.
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There are four possible combinations of values for the 'Intensity' and 'Video' pins, but not all monitors will display them as four distinct intensity levels.
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Because of the lack of pixel-addressable graphics, MDA owners were unable to play PC games released with graphics support. However,
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There are several attribute values - bit flags that can be set on each character on the screen. These are
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use with its sharp, high-resolution characters. Each character is rendered in a box of 9 × 14
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MDA cards used a DE-9 output port intended for a digital TTL monitor, like the IBM monochrome monitor.
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card for debugging purposes, this resulted in slow VGA performance. Microsoft recommended in its
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which can display 80 columns by 25 lines of high-resolution text characters or
606:(1994) to remove the monochrome card in such a setup for maximum speed of the VGA card. 594:
A typical 8-bit monochrome card could turn the 16-bit 8 MHz ISA bus into an 8-bit 4 MHz
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Early versions of the MDA board have hardware capable of outputting red, green and blue
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IBM Personal Computer Hardware Library: Technical Reference (Revised edition, 1983).
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Writing HOT Games for Microsoft Windows – The Microsoft Game Developers' Handbook
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to 1/3 luminance), but the actual display of these levels is monitor-dependent:
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IBM MDA, Control Systems Artist 1, Hitachi HD6845SP, UMC UM6845
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for attachment of a printer, avoiding the need to purchase a separate card.
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on the card, and this character set cannot be altered from the built-in
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has 256 characters (0-255), including the standard 95 printable
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It is also possible to combine the values of output pins 7 (
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invisible, underline, normal, bright (bold), reverse video,
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Another use for the MDA was as a secondary display for
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MDA Video card with Hitachi HD6845 (= Motorola MC6845)
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minus zero degrees (-0º) IBM 51xx PC Family Computers
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monitor driven by a Monochrome Display Adapter (MDA)
1204: 888: 886: 884: 882: 1210: 1200:. Microsoft Windows Multimedia. 1994. p. 17. 918: 862:List of defunct graphics chips and card companies 261:. The only way to simulate "graphics" is through 3019: 42:IBM PC original MDA and parallel printer adapter 967:Programmer's Guide To PC And PS/2 Video Systems 879: 1349: 1126: 155:introduced in 1981. The MDA does not have any 1804: 1335: 1120: 745:The signal had the following specifications: 912: 1214:IBM Personal Computer Questions and Answers 566:needs attention from an expert in Computing 27:IBM PC graphic adapter and display standard 1818: 1811: 1797: 1342: 1328: 1162:. Compuware Corporation. 1998. p. 12. 1079:"RGB Classic Games - Character attributes" 948:IBM Monochrome Display and Printer Adapter 36: 958: 784: 649: 491: 217: 209: 1264: 1101: 1058: 892: 604:Writing HOT Games for Microsoft Windows 503:The MDA was released alongside the IBM 14: 3048:Computer-related introductions in 1981 3020: 1227: 1054: 1052: 1050: 1048: 964: 577:may be able to help recruit an expert. 222:Image rendered in MDA text mode using 133:Monochrome Display and Printer Adapter 1792: 1323: 1172: 1228:Gibson, Steve (September 19, 1988). 1104:"Dual-Head operation on vintage PCs" 1038: 1036: 1011: 1009: 1007: 983: 919:Bradley, David J. (September 1990). 550: 520:One Hundred And One Monochrome Mazes 514:were released for the PC (including 408:to generate four brightness levels. 1045: 895:"Monochrome Display Adapter: Notes" 24: 2868:ThinkPad 240 with Transmeta Crusoe 1061:"Monochrome Display Adapter Notes" 178:The original IBM MDA was an 8-bit 173: 25: 3059: 1840:PC business acquisition by Lenovo 1033: 1004: 645: 186:display controller, 4 KB of 2904:Professional Graphics Controller 1102:Elliott, John (April 24, 2011). 555: 168:symbols useful for drawing forms 1286: 1277: 1258: 1240: 1221: 1185: 1166: 1147: 1095: 969:. Microsoft Press. p. 51. 901:from the original on 2016-11-23 893:Elliott, John C. (2005-11-06). 780: 546: 518:) and at least one game, IBM's 205: 2955:Industry Standard Architecture 1265:Ponting, Bob (June 26, 1989). 1173:Glass, Brett (April 1, 1991). 1071: 1059:Elliott, John (June 8, 2020). 939: 853:(only in very early MDA cards) 665:MDA connector pin assignments 159:graphics modes, only a single 13: 1: 1127:Manes, Stephen (1984-01-24). 872: 618:A well known example was the 245:The theoretical total screen 1359:PC-compatible video hardware 921:"The Creation of the IBM PC" 624:Hercules Computer Technology 609: 392:on the normally unconnected 7: 1254:. May 16, 1989. p. 96. 1129:"It's Not Easy Being Green" 824: 214:Characters of code page 437 53:; 43 years ago 10: 3064: 3038:Computer display standards 3028:Monochrome Display Adapter 2909:Multi-Color Graphics Array 2889:Monochrome Display Adapter 1833:Influence on the PC market 1351:Computer display standards 1211:Dievendorff, Dick (1981). 991:"IBM 5150 - early version" 121:Monochrome Display Adapter 31:Monochrome Display Adapter 18:Monochrome Display Adapter 2932: 2899:Enhanced Graphics Adapter 2881: 2850: 2822: 2789: 2731: 2653: 2607: 2539: 2511: 2452: 2402: 2382: 2342: 2292: 2257: 2248: 2239: 2166: 2157: 2114: 1940: 1858: 1849: 1827: 1575: 1471: 1357: 818:Tamarack Microelectronics 428: 425: 230:The MDA was based on the 194:intended for use with an 149:computer display standard 112:Enhanced Graphics Adapter 103: 98: 90: 83: 73: 65: 47: 35: 965:Wilton, Richard (1987). 857:List of video connectors 526:games or titles such as 232:IBM System/23 Datamaster 2924:Extended Graphics Array 1108:John Elliott's homepage 1083:www.classicdosgames.com 1065:John Elliott's homepage 841:Orchid Graphics Adapter 793:Other boards offer MDA 657:, looking at back of PC 2894:Color Graphics Adapter 1017:"IBM: MDA / CGA / EGA" 836:Color Graphics Adapter 831:Hercules Graphics Card 790: 658: 620:Hercules Graphics Card 505:Color Graphics Adapter 500: 487: 278:box-drawing characters 227: 215: 196:IBM monochrome monitor 108:Hercules Graphics Card 2194:PS/2 Note and PS/note 788: 758:: 720 × 350 653: 575:WikiProject Computing 495: 221: 213: 2914:Video Graphics Array 846:Green-screen display 762:Horizontal frequency 539:. Applications like 394:DE-9 video connector 1953:Industrial Computer 1580:display resolutions 1474:display resolutions 666: 441:6 – High intensity 412:corresponds to 2/3 32: 3033:IBM video hardware 2987:Music Feature Card 1822:personal computers 1217:. IBM. p. 25. 927:. pp. 414–420 791: 768:Vertical frequency 664: 659: 501: 426:Output pin values 256:hardware code page 247:display resolution 228: 216: 145:video display card 30: 3015: 3014: 2950:IBM PC compatible 2818: 2817: 2814: 2813: 2809: 2808: 2805: 2804: 2505: 2504: 2162: 2110: 2109: 1786: 1785: 764:: 18.432 kHz 743: 742: 592: 591: 485: 484: 386: 385: 381:Invisible reverse 377:Invisible reverse 157:pixel-addressable 117: 116: 16:(Redirected from 3055: 2863:Power Series 600 2509: 2508: 2255: 2254: 2251: 2250: 2246: 2245: 2164: 2163: 2161: 1856: 1855: 1842: 1835: 1813: 1806: 1799: 1790: 1789: 1344: 1337: 1330: 1321: 1320: 1314: 1313: 1311: 1309: 1304:on June 29, 2014 1300:. 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See the 431:brightness 406:Intensity), 390:TTL signals 91:Entry-level 3022:Categories 3007:ThinkLight 2851:Prototypes 2226:PS/55 Note 2065:ValuePoint 1871:DataMaster 1577:Widescreen 1139:24 October 1113:2020-08-16 1088:2022-05-06 1026:2022-11-17 997:2014-08-30 905:2016-11-23 873:References 756:Resolution 707:Intensity 634:using the 301:Attribute 161:monochrome 2965:Keyboards 2945:IBM BASIC 2797:TransNote 2075:PC Series 1773:7680×4800 1763:7680×4320 1758:6400×4800 1753:6400×4096 1748:5760×3240 1743:5120×3200 1738:5120×2880 1733:3840×2400 1728:3200×2400 1718:3840×2160 1713:3200×2048 1708:2560×1600 1698:2560×1440 1693:2048×1152 1688:1920×1200 1678:1920×1080 1673:1680×1050 1567:6400×4800 1562:5120×4096 1557:4096×3072 1552:3200×2400 1547:2560×2048 1542:2048×1536 1537:1600×1200 1532:1400×1050 1527:1280×1024 1472:Standard 1391:Quadcolor 1271:InfoWorld 1234:InfoWorld 1179:InfoWorld 851:Light pen 699:Not used 673:Function 610:Reception 570:talk page 537:debugging 437:7 – Video 429:Displayed 418:Intensity 414:luminance 334:Underline 329:Underline 313:Invisible 309:Invisible 263:ASCII art 164:text mode 104:Successor 3002:UltraBay 2940:IBM 5151 2919:IBM 8514 2873:WatchPad 2858:Leapfrog 2823:Handheld 2733:R series 2655:X series 2609:A series 2541:T series 2513:G series 2241:ThinkPad 2115:Portable 2100:M series 2095:A series 2085:NetVista 2060:EduQuest 1668:1680×945 1663:1600×900 1658:1440×900 1653:1366×900 1648:1366×768 1643:1280×800 1638:1280×768 1633:1280×720 1628:1024×576 1522:1152×864 1517:1024×768 1308:June 28, 899:Archived 825:See also 820:TD3088A3 814:Artist 1 804:Amstrad 524:BBS door 497:IBM 5151 304:Display 289:blinking 198:, and a 180:ISA card 151:for the 129:MDA card 2997:SurePOS 2975:Model M 2970:Model F 2933:Related 2835:WorkPad 2231:PCradio 2187:CL57 SX 1930:3270 AT 1898:3270 PC 1850:Desktop 1623:854×480 1618:800×480 1613:640×400 1608:480×320 1603:480×270 1598:432×240 1593:320×240 1588:240×160 1512:800×600 1507:720×348 1502:640×480 1497:640×350 1492:640×200 1487:320×200 1482:160×120 931:2 April 801:3270 PC 696:3, 4, 5 691:Ground 541:SoftICE 404:and 6 ( 182:with a 127:, also 99:History 56: ( 2790:Others 2407:series 2387:series 2347:series 2297:series 2262:series 2214:N51SLC 2182:L40 SX 2158:Laptop 2080:Aptiva 2028:70 486 2023:70 386 1988:30 286 1973:25 286 1941:Series 1925:AT/370 1903:XT 286 1893:XT/370 1767:8K UHD 1722:4K UHD 1464:(1991) 1458:(1990) 1452:(1989) 1445:AX-VGA 1441:(1987) 1435:(1987) 1429:(1987) 1423:(1987) 1417:(1987) 1411:(1984) 1405:(1984) 1399:(1984) 1393:(1983) 1387:(1982) 1381:(1982) 1375:(1981) 1369:(1981) 973:  954:. 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Index

Monochrome Display Adapter

Motorola 6845
Cards
Hercules Graphics Card
Enhanced Graphics Adapter
IBM
video display card
computer display standard
IBM PC
pixel-addressable
monochrome
text mode
symbols useful for drawing forms
ISA card
Motorola 6845
RAM
DE-9 output port
IBM monochrome monitor
parallel port


semigraphics
IBM System/23 Datamaster
word processing
pixels
display resolution
ROM
hardware code page
437

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