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146
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1 <appendix>
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2 <title>GO51...The 51 Column by 24 Line Video Display</title>
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3 <para>
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4 An alternative video screen device driver, which provides a 51
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5 column by 24 line display with upper and lower case character sets,
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6 can be incorporated into OS-9 with the command:
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7 <screen>
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8 GO51
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9 </screen>
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10 This command replaces the normal text screen driver with one that
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11 uses high resolution graphics to "draw" the characters. As there
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150
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12 are fewer pixels (dots) per character in this mode more characters
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146
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13 can be displayed on the screen, albeit with some loss of character
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14 definition.
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15 </para>
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16 <para>
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17 Note, however, that the use of a high resolution graphics page
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18 means that an extra 6K bytes will be needed in this mode. This
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19 extra memory requirement is not normally a problem but in memory-critical
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20 applications, such as the C and Pascal compilers, the user
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21 can simply avoid the use of GO51.
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22 </para>
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23 <para>
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24 This mode of display has a set of <emphasis>escape sequences</emphasis>
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25 (commands) to
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26 emulate commercial data terminals. In addition to the video screen
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27 driver, GO51 provides a new keyboard driver which features auto-repeat.
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28 The keyboard code allocation is the same as described in
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29 section 2.4.3 and Appendix D.
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30 </para>
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31 <section>
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32 <title>The GO51 Display Functions</title>
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33 <para>
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34 Like the normal 32 by 16 video display functions described in
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35 Appendix C the 51 by 24 mode provides many built in facilities to
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36 control the display. These functions are activated by the use of
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37 the various escape sequences and control characters described below:
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38 </para>
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39 <informaltable frame="none">
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40 <tgroup cols="2">
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648
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41 <colspec colwidth="1.5in"/>
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42 <colspec colwidth="3.5in"/>
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146
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43 <thead>
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44 <row>
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45 <entry>Escape Sequence (Hex)</entry>
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46 <entry>Name/Function</entry>
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47 </row>
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48 </thead>
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49
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50 <tbody>
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51 <row>
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52 <entry>1B 41 X Y</entry>
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53 <entry>CURSOR XY - move cursor to column X(0-50)
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54 and Y(0-23) where X and Y are single byte values.</entry>
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55 </row>
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56 <row>
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57 <entry>1B 42</entry>
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58 <entry>CLEAR EOL - clear from cursor to the end of
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59 line. Cursor position remains unchanged.</entry>
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60 </row>
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61 <row>
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62 <entry>1B 43</entry>
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63 <entry>CURSOR RIGHT - move cursor right by one character position.</entry>
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64 </row>
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65 <row>
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66 <entry>1B 44</entry>
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67 <entry>CURSOR UP - move cursor up by one line.</entry>
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68 </row>
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69 <row>
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70 <entry>1B 45</entry>
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71 <entry>CURSOR DOWN - move cursor down one line.</entry>
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72 </row>
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73 <row>
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74 <entry>1B 46</entry>
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75 <entry>REVERSE ON - turn reverse field on.</entry>
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76 </row>
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77 <row>
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78 <entry>1B 47</entry>
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79 <entry>REVERSE OFF - turn reverse field off.</entry>
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80 </row>
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81 <row>
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82 <entry>1B 48</entry>
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83 <entry>UNDERLINE ON - turn underline on.</entry>
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84 </row>
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85 <row>
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86 <entry>1B 49</entry>
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87 <entry>UNDERLINE OFF - turn underline off.</entry>
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88 </row>
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89 <row>
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90 <entry>1B 4A</entry>
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91 <entry>CLEAR EOS - clear from cursor to end of
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92 screen. Cursor position remains unchanged.</entry>
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93 </row>
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94 </tbody>
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95 </tgroup>
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96 </informaltable>
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97
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98
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99
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100
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101 <informaltable frame="none">
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102 <tgroup cols="2">
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648
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103 <colspec colwidth="1.5in"/>
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104 <colspec colwidth="3.5in"/>
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146
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105 <thead>
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106 <row>
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107 <entry>Control Character (Hex)</entry>
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108 <entry>Name/Function</entry>
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109 </row>
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110 </thead>
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111 <tbody>
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112 <row>
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113 <entry>07</entry>
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114 <entry>BELL - generates a short audible tone.</entry>
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115 </row>
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116 <row>
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117 <entry>08</entry>
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118 <entry>BACKSPACE (CURSOR LEFT) - moves cursor left one character position.</entry>
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119 </row>
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120 <row>
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121 <entry>0A</entry>
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122 <entry>LINE FEED - move cursor down by one line.</entry>
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123 </row>
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124 <row>
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125 <entry>0B</entry>
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126 <entry>CURSOR HOME - move cursor to home position 0,0 (top left).</entry>
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127 </row>
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128 <row>
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129 <entry>0C</entry>
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130 <entry>CLEAR SCREEN - clears the screen and home cursor.</entry>
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131 </row>
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132 </tbody>
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133 </tgroup>
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134 </informaltable>
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135 </section>
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136 </appendix>
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