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1178
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1 ********************************************************************
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2 * HiRes - HiRes Joystick Subroutine Module
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3 *
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4 * $Id$
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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 Created for Coyota project BGP 98/??/??
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9
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10 nam HiRes
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11 ttl HiRes Joystick Subroutine Module
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0
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12
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13 ifp1
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2624
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14 use defsfile
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0
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15 endc
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16
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1178
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17 edition set 1
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18
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0
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19 mod eom,name,Sbrtn+Objct,Reent+0,HiRes,size
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20
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21 size equ .
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22
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23 name fcs /HiRes/
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1178
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24 fcb edition
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0
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25
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26 * Hi-Res Read Routine
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27 *
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28 * Taken in part from "High Hopes for the Hi-Res"
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29 * by William Barden, Jr., Rainbow Magazine, Feb 1990, pp. 42
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30 *
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31 * Entry:
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32 * X = $0000 for Right, $0001 for Left
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33 *
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34 * Exit:
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35 * 2,s = param count (should be 4)
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36 * 4,s = addr of 1st param (joystick number)
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37 * 6,s = size of 1st param
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38 * 8,s = addr of 2nd param (joystick X)
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39 * 10,s = size of 2nd param
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40 * 12,s = addr of 3rd param (joystick Y)
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41 * 14,s = size of 3rd param
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42 * 16,s = addr of 4th param (joystick button)
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43 * 18,s = size of 4th param
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44
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45
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46 HiRes ldd 2,s get param count
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47 cmpd #4 4 params?
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48 bne error
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49 ldd [4,s] get joystick num.
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50 * fix up joystick value
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51 lslb shift left 3 times
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52 lslb
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53 lslb
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54 pshs b
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55 lda #$00 fetch X value
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56 bsr HiResHW
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57 std [9,s] save in param addr
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58 lda #$08 fetch Y value
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59 ldb ,s+ get joystick selector
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60 bsr HiResHW
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61 std [12,s]
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62 * get button value
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63 clra
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64 ldb #$FF
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65 stb $FF02
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66 ldb $FF00
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67 clr $FF02
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68 comb
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69 tst [5,s]
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70 beq BtnLft
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71 andb #$05
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72 bra BtnCnt
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73 BtnLft andb #$0A
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74 lsrb
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75 BtnCnt lsrb
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76 bcc BtnCnt2
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77 orb #$01
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78 BtnCnt2 std [16,s] save button
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79 clrb no error
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80 rts
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81 error coma
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82 ldb #E$IllArg
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83 rts
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84
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85
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86 * Hi-Res Hardware read routine
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87 *
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88 * This code is a hybrid of William Barden's Hi-Res
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89 * interface code in the February 1990 Rainbow, and
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90 * the code in CC3IO. It prevents infinite looping
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91 * that can happen in Barden's code. It also caps the
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92 * value at 639.
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93 *
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94 * Entry:
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95 * A = value to place in $FF01 (00 for X, 08 for Y)
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96 * B = value to place in $FF03 (00 for Right, 08 for Left)
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97 *
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98 * Exit:
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99 * D = value
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100
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101 * Delays for CoCo 3 OS-9 Level Two vs. CoCo 2 OS-9 Level One
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1178
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102 IFGT Level-1
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103 SETTLDLY equ 94
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104 POLLDLY equ 809
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0
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105 HIVAL equ 640
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1178
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106 ELSE
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107 SETTLDLY equ 94*2
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108 POLLDLY equ 404
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0
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109 HIVAL equ 320
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1178
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110 ENDC
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0
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111
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112 HiResHW pshs a
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113 lda $FF01
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114 anda #$F7
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115 ora ,s+
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116 sta $FF01 select X or Y
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117
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118 pshs b
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119 lda $FF03
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120 anda #$F7
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121 ora ,s+
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122 sta $FF03 select Right or Left
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123
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124 * turn off ramp
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125 lda $FF20
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126 anda #$03
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127 ora #$FC
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128 sta $FF20 turn off ramp
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129
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130 * delay for settling
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131 ldb #SETTLDLY delay loop
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132 Settle decb
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133 bne Settle
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134
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135 ldd #POLLDLY
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136 pshs a
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137 lda $FF20
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138 anda #$23
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139 sta $FF20 turn on ramp
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140 RampCnt lda $FF00 get byte at $FF00
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141 bmi CompVal branch if voltage hit
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142 decb B initially $29
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143 bne RampCnt
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144 dec ,s ,S initially $03
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145 bpl RampCnt
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146 puls a
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147 ldd #HIVAL-1 just assume highest
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148 rts
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149 CompVal puls a
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150 decb
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151 pshs b,a push hi-res count
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152 ldd #HIVAL
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153 subd ,s++ subtract count from 640
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154 bcc CompVal2
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155 clra
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156 clrb
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157 rts
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158 CompVal2 cmpd #HIVAL-1
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159 bcs HiHWRts
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160 ldd #HIVAL-1
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161 HiHWRts rts
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162
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163 emod
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164 eom equ *
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165 end
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