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31
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1 ********************************************************************
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2 * GFX - CoCo 2 graphics subroutine module
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3 *
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4 * $Id: gfx.asm,v 1.1.1.1 2001/02/21 23:30:54 boisy Exp $
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5 *
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6 * Ed. Comments Who YY/MM/DD
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7 * ------------------------------------------------------------------
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8 * 1 Original Tandy/Microware version
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9
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10 nam GFX
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11 ttl CoCo 2 graphics subroutine module
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12
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13 * Disassembled 98/09/25 21:47:16 by Disasm v1.6 (C) 1988 by RML
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14
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15 ifp1
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16 use defsfile
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17 endc
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18
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19 tylg set Sbrtn+Objct
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20 atrv set ReEnt+rev
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21 rev set $01
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22 edition set 1
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23
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24 mod eom,name,tylg,atrv,start,size
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25 u0000 rmb 0
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26 size equ .
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27
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28 name fcs /GFX/
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29 fcb edition
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30
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31 FuncTbl fdb Alpha-FuncTbl
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32 fcc "Alpha"
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33 fcb $FF
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34 fdb Circle-FuncTbl
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35 fcc "Circle"
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36 fcb $FF
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37 fdb Clear-FuncTbl
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38 fcc "Clear"
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39 fcb $FF
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40 fdb CColor-FuncTbl
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41 fcc "Color"
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42 fcb $FF
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43 fdb GColr-FuncTbl
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44 fcc "GColr"
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45 fcb $FF
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46 fdb GLoc-FuncTbl
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47 fcc "GLoc"
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48 fcb $FF
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49 fdb JoyStk-FuncTbl
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50 fcc "JoyStk"
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51 fcb $FF
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52 fdb Line-FuncTbl
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53 fcc "Line"
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54 fcb $FF
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55 fdb Mode-FuncTbl
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56 fcc "Mode"
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57 fcb $FF
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58 fdb Move-FuncTbl
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59 fcc "Move"
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60 fcb $FF
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61 fdb Point-FuncTbl
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62 fcc "Point"
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63 fcb $FF
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64 fdb Quit-FuncTbl
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65 fcc "Quit"
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66 fcb $FF
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67 fdb $0000
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68
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69 stkdepth set 9
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70
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71 start leas -stkdepth,s
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72 ldd 2+stkdepth,s get parameter count
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73 beq BadFunc
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74 tsta param count greater than 255?
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75 bne BadFunc yep, branch to error
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76 leau >FuncTbl,pcr point to function pointer table
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77 L007D ldy ,u++ get pointer to function
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78 beq NoFunc
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79
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80 * Compare passed function name to our list
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81 ldx 4+stkdepth,s
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82 L0084 lda ,x+ get passed param char
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83 eora ,u+ XOR it with compared param char
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84 anda #$DF make case same
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85 beq L0094 branch if equal
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86 leau -1,u back up one
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87 L008E tst ,u+
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88 bpl L008E
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89 bra L007D
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90 L0094 tst -1,u
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91 bpl L0084
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92 tfr y,d put funcion pointer in D
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93 leay >FuncTbl,pcr point Y to table
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94 leay d,y get function address
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95 leax ,s
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96 leau <$11,s
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97 ldd stkdepth+2,s put parameter count in D
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98 jmp ,y
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99
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100 NoFunc ldb #E$NoRout
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101 bra L00AF
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102 BadFunc ldb #E$ParmEr $38
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103 L00AF coma
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104 leas stkdepth,s
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105 rts
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106
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107 * Each subroutine enters with the following parameters
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108 * B = parameter count
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109 * X = temporary stack
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110 * U = pointer to size of first parameter
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111
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112 Mode lda #$0F
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113 bra L00B9
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114
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115 Move lda #$15
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116 L00B9 cmpb #$03 correct number of params?
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117 bne BadFunc
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118 bra L010B
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119
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120 CColor lda #$11
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121 bra L00DE
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122
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123 Point cmpb #$03 correct number of params?
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124 beq L00D4
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125 cmpb #$04
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126 bne BadFunc
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127 leau <$19,s
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128 lbsr L015E
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129 leau <$11,s
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130 L00D4 lda #$18
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131 bra L010B
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132
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133 Clear cmpb #$01 correct number of params?
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134 beq L00E4
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135 lda #$10
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136 L00DE cmpb #$02
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137 bne BadFunc
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138 bra L0136
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139
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140 L00E4 lda #$13
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141 bra L0142
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142
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143 Line cmpb #$06 correct number of params?
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144 bhi BadFunc
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145 cmpb #$03
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146 bcs L015B
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147 bitb #$01
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148 bne L0103
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149 leau <$19,s
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150 cmpb #$04
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151 beq L00FE
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152 leau <$21,s
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153 L00FE bsr L015E
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154 leau <$11,s
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155 L0103 cmpb #$04
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156 bls L0109
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157 bsr L0164
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158 L0109 lda #$16
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159 L010B sta ,x+
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160 bsr L016E
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161 bsr L016E
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162 bra L0144
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163
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164 Circle cmpb #$05 correct number of params?
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165 bhi L015B
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166 cmpb #$02
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167 bcs L015B
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168 bitb #$01
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169 beq L012E
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170 leau <$15,s
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171 cmpb #$03
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172 beq L0129
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173 leau <$1D,s
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174 L0129 bsr L015E
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175 leau <$11,s
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176 L012E cmpb #$03
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177 bls L0134
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178 bsr L0164
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179 L0134 lda #$1A
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180 L0136 sta ,x+
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181 bsr L016E
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182 bra L0144
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183
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184 Alpha lda #$0E
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185 bra L0142
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186
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187 Quit lda #$12
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188 L0142 sta ,x+
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189 L0144 bsr L0149
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190 leas stkdepth,s
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191 rts
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192
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193 L0149 tfr x,d
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194 leax 2,s
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195 pshs x
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196 subd ,s++
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197 tfr d,y
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198 lda #1
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199 os9 I$Write
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200 rts
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201
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202 L0159 leas $06,s
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203 L015B lbra BadFunc
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204 L015E lda #$11
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205 sta ,x+
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206 bra L016E
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207 L0164 puls y
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208 lda #$15
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209 sta ,x+
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210 bsr L016E
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211 pshs y
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212 L016E pshs y,b,a
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213 ldd [,u++]
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214 sta ,x+
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215 pulu y
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216 leay -$01,y
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217 beq L0183
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218 leay -$01,y
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219 bne L0159
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220 tsta
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221 bne L0159
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222 stb -$01,x
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223 L0183 puls pc,y,b,a
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224
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225 GLoc cmpb #$02 correct number of params?
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226 bne L015B
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227 ldx <$13,s
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228 leax -$02,x
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229 bne L015B
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230 lda #1 standard out
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231 ldb #SS.DStat
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232 os9 I$GetStt
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233 bcs L019C
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234 stx [<$11,s]
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235 L019C leas stkdepth,s
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236 rts
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237
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238 GColr cmpb #2 correct number of params?
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239 beq L01AD
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240 cmpb #$04
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241 bne L015B
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242 bsr L0164
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243 bsr L0149
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244 bcs L019C
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245 L01AD lda #$01
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246 ldb #$12
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247 os9 I$GetStt
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248 bcs L019C
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249 tfr a,b
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250 bra L01ED
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251 L01BA leau $04,u
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252 pshs u,x
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253 ldx -$02,u
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254 ldu -$04,u
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255 leax -$01,x
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256 beq L01CC
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257 leax -$01,x
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258 bne L0159
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259 clr ,u+
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260 L01CC stb ,u+
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261 puls pc,u,x
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262
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263 JoyStk cmpb #5 correct number of params?
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264 bne L015B
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265 clr ,x+
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266 bsr L016E
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267 ldx -2,x
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268 lda #1
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269 ldb #SS.Joy
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270 os9 I$GetStt
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271 bcs L019C
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272 tfr a,b
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273 bsr L01BA
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274 tfr x,d
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275 bsr L01BA
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276 tfr y,d
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277 L01ED bsr L01BA
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278 leas stkdepth,s
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279 rts
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280
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281 emod
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282 eom equ *
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283 end
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284
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