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2024
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1 IFNE VTIODEFS-1
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2 VTIODEFS SET 1
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3
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1933
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4 ********************************************************************
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5 * VTIODefs - Video Terminal I/O Definitions for CoCo 1/2
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6 *
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7 * $Id$
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8 *
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9 * Edt/Rev YYYY/MM/DD Modified by
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10 * Comment
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11 * ------------------------------------------------------------------
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12 * 2004/11/29 P.Harvey-Smith.
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13 * Added symbolic defines for bits in V.CoLoad.
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14 *
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15 * 2004/12/02 P.Harvey-Smith.
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16 * Moved over all variables from co51.asm
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17 *
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18 * 2005/04/09 P.Harvey-Smith.
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19 * Decoded rest of the CoHR memory locations.
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20 *
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2024
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21 * 2005/04/24 P.Harvey-Smith.
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1933
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22 * Added variables for cursor flash, currently only implemented in co51
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23 *
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2024
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24 NAM VTIODefs
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25 TTL Video Terminal I/O Definitions for CoCo 1/2
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1933
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26
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27 ********************
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28 * VTIO Static Memory
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29 *
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2024
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30 ORG V.SCF
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31 V.ScrnA RMB 2 (2) screen start address in system memory
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32 V.ScrnE RMB 2 (2) address of end of screen
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33 V.CrsrA RMB 1 (2) cursor address
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34 V.CrsAL RMB 1 cursor address low
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35 V.CChar RMB 1 value of character under cursor
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36 V.Mode RMB 1 mode: 0=256x192 x2, 1=128x192 x4
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37 V.NGChr RMB 1 number of additional characters to get
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38 V.RTAdd RMB 2 (2) return address after getting characters
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39 V.NChar RMB 1 character to process
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40 V.NChr2 RMB 1 and the next one
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41 RMB 1
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42 V.Chr1 RMB 1 same as under cursor character
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43 V.CColr RMB 1 cursor color
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44 V.Col RMB 1 number of columns for this screen
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45 V.Row RMB 1 number of rows
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46 V.Alpha RMB 1 0 when in alpha mode
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47 V.PIA1 RMB 1 PIA1Base value
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48 V.Rdy RMB 1 device ready (see SS.DStat 0=not ready)
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49 V.CFlg1 RMB 1 VDG display code values
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50 V.SBAdd RMB 2 (2) address of block screen is in
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51 V.GBuff RMB 2 allocation for graphics buffers (block#)
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52 V.AGBuf RMB 4 (2) additional graphics buffer
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53 V.FFMem RMB 2 Flood fill alloc'ed mem
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54 V.FFSPt RMB 2 Flood fill current stack pointer
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55 V.FFSTp RMB 1 Flood fill stack top
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56 V.FF6 RMB 1 flood fill flag
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57 V.FFFlag RMB 1 ??
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58 V.MTabl RMB 2 (2) address of mask table for pixels in byte
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59 V.PixBt RMB 1 bit mask for modes (0=$07, 1=$03 )#pixels/byte
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60 V.GCrsX RMB 1 graphics cursor X value
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61 V.GCrsY RMB 1 graphics cursor Y
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62 V.Msk1 RMB 1 mask byte 1
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63 V.Msk2 RMB 1 mask byte 2 (00,55,AA,FF)
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64 V.MCol RMB 1 color? (C003,8001)
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65 V.4A RMB 1
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66 V.PMask RMB 1 pixel mask for colors (i.e. $55, $CC etc)
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67 V.4C RMB 1
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68 V.4D RMB 1
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69 V.4E RMB 1
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70 V.4F RMB 1
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71 V.Caps RMB 1 caps lock info: $00=lower $FF=upper
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72 V.ClkCnt RMB 1 clock count ??
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73 V.WrChr RMB 1 character to write
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74 V.CurCo RMB 1 current CO-module in use
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1933
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75 * start of CoWP-specific static memory
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2024
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76 V.Co80X RMB 1 V.54
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77 V.Co80Y RMB 1 V.55
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78 V.ColPtr RMB 1 V.56
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79 V.RowPtr RMB 1 V.57
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80 V.C80X RMB 1 CoWP X position
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81 V.C80Y RMB 1 CoWP Y position
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82 V.Invers RMB 1
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1933
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83 * end of CoWP-specific static memory
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2024
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84 V.DspVct RMB 2 vector to display screen
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85 V.CnvVct RMB 2 vector to X/Y to address conversion
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86 V.LKeyCd RMB 1 last key code
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87 V.2Key1 RMB 1 2nd Key 1
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88 V.2Key2 RMB 1 2nd Key 2
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89 V.2Key3 RMB 1 2nd Key 3
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90 V.Key1 RMB 1 Key 1
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91 V.Key2 RMB 1 Key 2
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92 V.Key3 RMB 1 Key 3
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93 V.ShftDn RMB 1 SHIFT/CTRL state
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94 V.CtrlDn RMB 1 CTRL key down
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95 V.KeyFlg RMB 1 key flag
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96 V.AltDwn RMB 1 ALT key down
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97 V.KySns RMB 1 key sense flags
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98 V.KySame RMB 1 key same as last flag
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99 V.KySnsF RMB 1 key sense flag
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100 V.Spcl RMB 1
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101 V.KTblLC RMB 1 key table entry #
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102 V.6F RMB 1 ???
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103 V.COLoad RMB 1 CO-module loaded flags
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104 V.CFlag RMB 1 true lowercase flag $10=true, $00=false
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105 V.GrfDrvE RMB 2 GrfDrv entry point
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106 V.CoVDGE RMB 2 CoVDG entry point
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107 V.CoWPE RMB 2 CoWP entry point
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108 V.CoHRE RMB 2 CoHR entry point
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1933
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109
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2024
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110 V.Flash RMB 2 Cursor flash routine address.
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111 v.FlashCount RMB 1 Cursor flash count
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112 V.NoFlash RMB 1 When this is non-zero do not flash cursor
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1933
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113
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114 * CoHR vars
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115
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2024
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116 V.51ScrnA RMB 2 * Screen address.
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117 V.51XPos RMB 1 * X co-ordinate
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118 V.51YPos RMB 1 * Y co-ordinate
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119 V.51EscSeq RMB 1 * In escape sequence
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120 V.51ReverseFlag RMB 1 * Reverse video flag
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121 V.51UnderlineFlag RMB 1 * Underline flag
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122 V.51CtrlDispatch RMB 2 * Ctrl char dispatch address, currently processing
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123 V.51BytePixOffset RMB 1 * byte offset in screen line, of character X position
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124 V.51OldCursorPosX RMB 1 * Position of old cursor before update
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125 V.51OldCursorPosY RMB 1
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126 V.51CursorChanged RMB 1 * Has cursor position changed ? 1=yes,0=no
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127 V.51CursorOn RMB 1 * Is cursor on ? 1=yes 0=no
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128 V.51XORFlag RMB 1 * and data to screen (0) or Xor (1)
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129 V.51ScreenMask1 RMB 1 * screen masks for drawing characters on screen
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130 V.51ScreenMask2 RMB 1
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1933
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131 * End of CoHR vars
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132 **** Note these have to come at the end of the defs, or the keyboard ****
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133 **** code can clobber variables defined after these ! ****
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2024
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134 V.IBufH RMB 1 input buffer head
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135 V.IBufT RMB 1 input buffer tail
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136 V.InBuf RMB 1 input buffer ptr
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137 V.51End RMB 1
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138 RMB 250-.
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139 V.Last EQU .
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140
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141
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1933
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142 * Unknown for now
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143 *VD.FFMem rmb 2 (2) bottom of stack for flood fill
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144 *VD.FFSPt rmb 2 (2) flood fill stack pointer
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145 *VD.FFSTp rmb 2 (2) flood fill stack top pointer
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146 *VD.FF6 rmb 1 flood fill flag
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147 *VD.MCol2 rmb 1 color
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148 *VD.FF1 rmb 1 data for flood fill
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149 *VD.FF2 rmb 1 data for flood fill
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150 *VD.FFMsk rmb 1 flood fill mask
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151 *VD.FFFlg rmb 1 flood fill flag
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152 *VD.Palet rmb 16 (16) current palette values
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153 *VD.PlFlg rmb 1 initialized to $08 by L00DB, and then unused!
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2024
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154
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1933
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155 *
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156 * Defs for V.COLoad flags.
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157 *
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2024
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158
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159 ModCoVDG EQU %00000010 CoVDG, Built-in VDG 32x16.
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160 ModCoWP EQU %00000100 CoWP, WordPak, 80x25
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161 ModCoHR EQU %00001000 CoHR, PMODE 4 51x25 text
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1933
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162
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163 *
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164 * Defs for cursor flash counter
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165 *
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166
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167 CFlash50hz EQU 25 * 50Hz flash counter
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168 CFlash60Hz EQU 30 * 60Hz flash counter
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1933
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169
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170 ENDC
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