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1 *********************************************************************
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2 * JoyDrv - Joystick Driver for 6552/Logitech Mouse
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3 *
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4 * $Id$
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5 *
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1263
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6 * Edt/Rev YYYY/MM/DD Modified by
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7 * Comment
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8 * ------------------------------------------------------------------
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1263
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9 * 6 1988/??/??
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10 * L2 Upgrade distribution version.
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0
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11
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12 nam JoyDrv
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13 ttl Joystick Driver for 6552/Logitech Mouse
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14
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15 * Disassembled 98/09/09 09:22:44 by Disasm v1.6 (C) 1988 by RML
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16
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17 ifp1
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18 use defsfile
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19 use l52.defs
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20 endc
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21
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22 tylg set Systm+Objct
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23 atrv set ReEnt+rev
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1263
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24 rev set $00
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0
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25 edition set 6
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26
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27 MPISlot set $00
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28
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29 mod eom,name,tylg,atrv,start,$FF64
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30
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31 name fcs /JoyDrv/
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32 fcb edition
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33
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34 start lbra Init
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35 lbra Term
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36 lbra SSMsBtn
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37 lbra SSMsXY
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38 lbra SSJoyBtn
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39
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40 SlotSlct equ MPISlot
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41
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42 SSJoyXY pshs x,b,a
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43 ldx #PIA0Base
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44 lda <$23,x
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45 ldb <$20,x
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46 pshs b,a
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47 anda #$F7
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48 sta <$23,x
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49 lda $01,x
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50 ldb $03,x
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51 pshs b,a
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52 andb #$F7
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53 lsr $04,s
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54 bcs L0043
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55 orb #$08
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56 L0043 stb $03,x
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57 lda ,s
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58 ora #$08
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59 bsr L0065
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60 std $06,s
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61 lda ,s
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62 anda #$F7
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63 bsr L0065
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64 std $04,s
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65 puls b,a
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66 sta $01,x
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67 stb $03,x
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68 puls b,a
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69 stb <$20,x
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70 sta <$23,x
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71 puls pc,y,x
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72 L0065 sta $01,x
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73 lda #$7F
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74 ldb #$40
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75 bra L0078
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76 L006D lsrb
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77 cmpb #$01
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78 bhi L0078
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79 lsra
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80 lsra
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81 tfr a,b
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82 clra
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83 rts
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84 L0078 pshs b
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85 sta <$20,x
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86 tst ,x
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87 bpl L0085
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88 adda ,s+
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89 bra L006D
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90 L0085 suba ,s+
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91 bra L006D
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92
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93 IRQPckt equ *
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94 Pkt.Flip fcb $00 D.Poll flip byte
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95 Pkt.Mask fcb $07 D.Poll mask byte
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96 fcb $01 priority
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97
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98 Init clra
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99 clrb
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100 sta Btn.Cntr,u set up Rx data sync, no button(s) pressed
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101 std CrntXPos,u set up X position at left screen edge
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102 ldd #HResMaxY*2
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103 std CrntYPos,u set up Y position at top screen edge
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104 ldd M$Mem,pcr get base hardware address
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105 leax IRQPckt,pcr
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106 leay IRQSvc,pcr
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107 os9 F$IRQ
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108 bcs InitExit go report error...
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109 tfr d,x
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110 ldd #$46E0
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111 pshs cc
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112 orcc #IntMasks disable IRQs while setting up hardware
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113 sta 1,x reset 6552
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114 stb 1,x reset 6552
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115 clr 2,x
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116 lda >PIA1Base+3 get PIA CART* input control register
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117 anda #$FC clear PIA CART* control bits
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118 sta >PIA1Base+3 disable PIA CART* FIRQs
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119 lda >PIA1Base+2 clear possible pending PIA CART* FIRQ
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120 ldd #$0187 GIME CART* IRQ enable
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121 ora <D.IRQER mask in current GIME IRQ enables
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122 sta <D.IRQER save GIME CART* IRQ enable shadow register
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123 sta >IrqEnR enable GIME CART* IRQs
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124 stb ,x
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125 ldb 3,x *ensure old error,
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126 ldb ,x *Rx data, and
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127 ldb 3,x *IRQ flags
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128 ldb ,x *are clear
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129 andb Pkt.Mask,pcr IRQ bits still set?
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130 bne InitErr yes, go disable ACIA and return...
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131 lda SlotSlct,pcr get MPI slot select value
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132 bmi InitExit no MPI slot select, go exit...
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133 sta >MPI.Slct set MPI slot select register
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134 puls pc,cc recover original regs, return...
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135
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136 Term pshs cc save regs we alter
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137 orcc #IntMasks mask IRQs while disabling ACIA
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138 InitErr ldx M$Mem,pcr get base address
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139 lda #$7F *disable all
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140 sta ,x *ACIA IRQs
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141 puls cc
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142 tfr x,d copy status register address
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143 ldx #$0000 remove IRQ table entry
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144 leay IRQSvc,pcr
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145 os9 F$IRQ
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146 InitExit rts
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147
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148 SSJoyBtn ldb #$FF
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149 ldx #PIA0Base
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150 stb $02,x
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151 ldb ,x
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152 comb
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153 andb #$0F
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154 rts
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155
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156 SSMsBtn pshs cc
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157 orcc #IntMasks
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158 lda ,u
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159 tfr a,b
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160 andb #$C0
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161 bne L0120
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162 bita #$20
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163 beq L011A
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164 orb #$03
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165 L011A bita #$10
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166 beq L0120
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167 orb #$0C
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168 L0120 anda #$3F
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169 sta ,u
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170 puls pc,cc
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171
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172 SSMsXY ldd #$017E
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173 pshs cc
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174 orcc #IntMasks
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175 ldx CrntXPos,u
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176 subd CrntYPos,u
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177 lsra
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178 rorb
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179 tfr d,y
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180 puls pc,cc
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181
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182 ***
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183 * Mouse IRQ service routine.
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184 *
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185 * INPUT: A = flipped and masked device status byte
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186 * U = mouse data area address
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187 *
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188 * OUTPUT: updated serial mouse data
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189 * CC Carry clear
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190 * D, X, Y, and U registers may be altered
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191 *
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192 * ERROR OUTPUT: none
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193 IRQSvc ldx M$Mem,pcr
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194 bita #$06 any error(s)?
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195 beq ChkRDRF no, go check Rx data
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196 ldb 3,x read Rx data register to clear error flags
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197 ClrRxCnt lda Btn.Cntr,u get current button status and Rx data counter
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198 anda #^BC.RxCnt clear Rx data counter
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199 ButnExit sta Btn.Cntr,u reset Rx mouse data counter to wait for sync...
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200 IRQExit clrb clear Carry to mark IRQ serviced
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201 rts
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202
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203 ChkRDRF bita #$01 Rx data?
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204 beq IRQExit no, but this branch should never be taken...
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205 ldb 3,x get Rx data
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206 lda Btn.Cntr,u get button status and Rx counter
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207 anda #BC.RxCnt waiting for sync with mouse data?
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208 bne ChkOfst no, go check Rx offset...
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209 tfr b,a copy Rx data
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210 anda #SyncMask clear button status bits
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211 cmpa #SyncData is it *PROBABLY* the initial (sync) byte?
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212 bne IRQExit no, just ignore it...
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213 comb invert button bits to match SS.Mouse format
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214 lslb *move button
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215 lslb *status into
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216 lslb *bits 5-3
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217 andb #BC.Butns clear everything but the button bits
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218 incb set Rx counter to first XY position byte
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219 pshs b
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220 lda ,u
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221 bita #$08
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222 beq L017A
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223 bitb #$08
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224 bne L017A
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225 lda #$C0
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226 ldx CrntXPos,u
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227 cmpx #$0140
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228 bcs L017A
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229 lsla
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230 L017A anda #$C0
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231 ora ,s+
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232 bra ButnExit go save new button status and Rx counter, exit...
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233 ChkOfst cmpa #PcktSize-1 last byte in mouse packet?
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234 bcs SaveData no, go save mouse data to Rx buffer...
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235 ldx #HResMaxY*2 get maximum Y position
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236 pshs x save it for CalcPos subroutine
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237 leax CrntYPos,u point to current Y position
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238 leay Buffer+1,u point to primary Y offset
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239 bsr CalcPos go calculate & save mouse's new Y position
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240 ldb Buffer+2,u get mouse packet's secondary X offset
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241 ldx #HResMaxX get maximum X position
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242 stx ,s save it for CalcPos subroutine
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243 leax CrntXPos,u point to current X position
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244 leay Buffer+0,u point to primary X offset
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245 bsr CalcPos go calculate & save mouse's new X position
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246 leas 2,s clean up stack
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247 bra ClrRxCnt go save button status and clear Rx counter, exit...
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248 SaveData stb a,u save XY position byte to mouse data Rx buffer
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249 inc Btn.Cntr,u point to next byte in Rx buffer
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250 clrb clear Carry to mark IRQ serviced
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251 rts
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252
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253 CalcPos sex sign extend mouse packet's 2nd XY offset ([D] = -128 to +127)
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254 pshs d save it temporarily...
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255 ldb ,y get mouse packet's 1st XY offset
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256 sex sign extend it ([D] = -128 to +127)
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257 addd ,s add mouse's 2nd XY offset
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258 std ,s save XY offset total temporarily...
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259 bpl PosAdjst go de-sensitize positive "ballistic" XY offset...
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260 orb #%00000111 if -8<XYoffset<0, no "ballistic" response
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261 addd #1 "fix" negative offset "ballistic" response
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262 bra RShiftD go calculate "ballistic" offset...
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263 PosAdjst andb #%11111000 if 0<XYoffset<8, no "ballistic" response
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264 RShiftD asra *calculate 50% of XY offset
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265 rorb *for "ballistic" response
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266 addd ,s++ add original XY offset total, clean up stack
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267 addd ,x add mouse's current XY position
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268 bpl CheckPos zero or positive XY position, go check it...
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269 clra *set minimum
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270 clrb *XY position
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271 CheckPos cmpd 2,s past maximum XY position?
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272 bls SavePos no, go save it...
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273 ldd 2,s get maximum XY position
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274 SavePos std ,x save new XY position
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275 rts
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276
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277 emod
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278 eom equ *
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279 end
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