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annotate docs/nitros9guide/go51.refentry @ 1093:4dae346c4969

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Added crossreferences and lowercased synopsises
author roug
date Mon, 07 Apr 2003 21:01:46 +0000
parents b5ff125a1d60
children b00cf13c9f61
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1 <refentry id="go51">
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2 <refnamediv>
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3 <refname>GO51</refname>
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4 <refpurpose>The 51 Column by 24 Line Video Display</refpurpose>
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5 </refnamediv>
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6
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7 <refsynopsisdiv>
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8 <cmdsynopsis>
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9 <command>go51</command>
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10 </cmdsynopsis>
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11 </refsynopsisdiv>
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12
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13 <refsect1><title>Description</title>
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14 <para>
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15 An alternative video screen device driver, which provides a 51
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16 column by 24 line display with upper and lower case character sets,
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17 can be incorporated into OS-9 with the command:
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18 <screen>
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19 GO51
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20 </screen>
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21 This command replaces the normal text screen driver with one that
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22 uses high resolution graphics to &quot;draw&quot; the characters. As there
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23 are fewer pixels (dots) per character in this mode more characters
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24 can be displayed on the screen, albeit with some loss of character
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25 definition.
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26 </para>
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27 <para>
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28 Note, however, that the use of a high resolution graphics page
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29 means that an extra 6K bytes will be needed in this mode. This
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30 extra memory requirement is not normally a problem but in memory-critical
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31 applications, such as the C and Pascal compilers, the user
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32 can simply avoid the use of <command>go51</command>.
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33 </para>
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34 <para>
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35 This mode of display has a set of <emphasis>escape sequences</emphasis>
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36 (commands) to
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37 emulate commercial data terminals. In addition to the video screen
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38 driver, <command>go51</command> provides a new keyboard driver which features auto-repeat.
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39 The keyboard code allocation is the same as described in
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40 section <xref linkend="sec2.4.3"/> and <xref linkend="key-definitions"/>
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41 </para>
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42 </refsect1>
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43 <refsect1>
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44 <title>The GO51 Display Functions</title>
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45 <para>
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46 Like the normal 32 by 16 video display functions described in
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47 <xref linkend="video-display"/>
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48 the 51 by 24 mode provides many built in facilities to
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49 control the display. These functions are activated by the use of
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50 the various escape sequences and control characters described below:
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51 </para>
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52 <informaltable frame="none">
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53 <tgroup cols="2">
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54 <colspec colwidth="1.5in"/>
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55 <colspec colwidth="3.5in"/>
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56 <thead>
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57 <row>
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58 <entry>Escape Sequence (Hex)</entry>
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59 <entry>Name/Function</entry>
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60 </row>
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61 </thead>
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62
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63 <tbody>
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64 <row>
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65 <entry>1B 41 X Y</entry>
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66 <entry>CURSOR XY - move cursor to column X(0-50)
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67 and Y(0-23) where X and Y are single byte values.</entry>
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68 </row>
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69 <row>
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70 <entry>1B 42</entry>
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71 <entry>CLEAR EOL - clear from cursor to the end of
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72 line. Cursor position remains unchanged.</entry>
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73 </row>
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74 <row>
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75 <entry>1B 43</entry>
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76 <entry>CURSOR RIGHT - move cursor right by one character position.</entry>
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77 </row>
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78 <row>
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79 <entry>1B 44</entry>
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80 <entry>CURSOR UP - move cursor up by one line.</entry>
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81 </row>
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82 <row>
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83 <entry>1B 45</entry>
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84 <entry>CURSOR DOWN - move cursor down one line.</entry>
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85 </row>
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86 <row>
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87 <entry>1B 46</entry>
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88 <entry>REVERSE ON - turn reverse field on.</entry>
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89 </row>
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90 <row>
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91 <entry>1B 47</entry>
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92 <entry>REVERSE OFF - turn reverse field off.</entry>
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93 </row>
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94 <row>
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95 <entry>1B 48</entry>
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96 <entry>UNDERLINE ON - turn underline on.</entry>
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97 </row>
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98 <row>
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99 <entry>1B 49</entry>
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100 <entry>UNDERLINE OFF - turn underline off.</entry>
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101 </row>
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102 <row>
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103 <entry>1B 4A</entry>
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104 <entry>CLEAR EOS - clear from cursor to end of
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105 screen. Cursor position remains unchanged.</entry>
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106 </row>
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107 </tbody>
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108 </tgroup>
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109 </informaltable>
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110
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111
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112
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113
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114 <informaltable frame="none">
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115 <tgroup cols="2">
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116 <colspec colwidth="1.5in"/>
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117 <colspec colwidth="3.5in"/>
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118 <thead>
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119 <row>
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120 <entry>Control Character (Hex)</entry>
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121 <entry>Name/Function</entry>
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122 </row>
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123 </thead>
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124 <tbody>
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125 <row>
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126 <entry>07</entry>
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127 <entry>BELL - generates a short audible tone.</entry>
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128 </row>
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129 <row>
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130 <entry>08</entry>
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131 <entry>BACKSPACE (CURSOR LEFT) - moves cursor left one character position.</entry>
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132 </row>
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133 <row>
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134 <entry>0A</entry>
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135 <entry>LINE FEED - move cursor down by one line.</entry>
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136 </row>
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137 <row>
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138 <entry>0B</entry>
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139 <entry>CURSOR HOME - move cursor to home position 0,0 (top left).</entry>
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140 </row>
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141 <row>
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142 <entry>0C</entry>
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143 <entry>CLEAR SCREEN - clears the screen and home cursor.</entry>
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144 </row>
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145 </tbody>
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146 </tgroup>
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147 </informaltable>
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148 <note><para>
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149 The GO51 device driver is only available on Dragon Computers.
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150 </para></note>
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151 </refsect1>
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152 </refentry>