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1 ********************************************************************
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2 * JoyDrv - Joystick Driver for 6551/Logitech Mouse
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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 * 6 L2 Upgrade distribution version
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9
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10 nam JoyDrv
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11 ttl Joystick Driver for 6551/Logitech Mouse
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12
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13 * Disassembled 98/09/09 09:22:44 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 use l51.defs
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18 endc
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19
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20 tylg set Systm+Objct
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21 atrv set ReEnt+rev
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22 rev set $01
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23 edition set 6
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24
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25 MPISlot set $00
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26
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27 mod eom,name,tylg,atrv,start,$FF68
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28
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29 name fcs /JoyDrv/
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30 fcb edition
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31
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32 SlotSlct equ MPISlot
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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 SSJoyXY pshs x,b,a
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41 ldx #PIA0Base
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42 lda <$23,x
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43 ldb <$20,x
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44 pshs b,a
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45 anda #$F7
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46 sta <$23,x
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47 lda $01,x
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48 ldb $03,x
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49 pshs b,a
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50 andb #$F7
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51 lsr $04,s
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52 bcs L0043
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53 orb #$08
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54 L0043 stb $03,x
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55 lda ,s
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56 ora #$08
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57 bsr L0065
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58 std $06,s
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59 lda ,s
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60 anda #$F7
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61 bsr L0065
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62 std $04,s
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63 puls b,a
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64 sta $01,x
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65 stb $03,x
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66 puls b,a
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67 stb <$20,x
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68 sta <$23,x
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69 puls pc,y,x
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70 L0065 sta $01,x
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71 lda #$7F
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72 ldb #$40
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73 bra L0078
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74 L006D lsrb
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75 cmpb #$01
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76 bhi L0078
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77 lsra
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78 lsra
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79 tfr a,b
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80 clra
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81 rts
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82 L0078 pshs b
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83 sta <$20,x
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84 tst ,x
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85 bpl L0085
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86 adda ,s+
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87 bra L006D
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88 L0085 suba ,s+
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89 bra L006D
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90
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91 IRQPckt equ *
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92 Pkt.Flip fcb Stat.Flp D.Poll flip byte
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93 Pkt.Mask fcb Stat.Msk D.Poll mask byte
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94 fcb $01 priority
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95
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96 Init clra
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97 clrb
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98 sta Btn.Cntr,u set up Rx data sync, no button(s) pressed
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99 std CrntXPos,u set up X position at left screen edge
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100 ldd #HResMaxY*2
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101 std CrntYPos,u set up Y position at top screen edge
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102 ldd M$Mem,pcr get base hardware address
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103 addd #StatReg status register address
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104 leax IRQPckt,pcr
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105 leay IRQSvc,pcr
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106 os9 F$IRQ
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107 bcs InitExit go report error...
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108 ldx M$Mem,pcr get base hardware address again
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109 ldd #(TIC.RTS!Cmd.DTR)*256+(DB.8!Ctl.RClk!BR.01200) [D]=command:control
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110 pshs cc
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111 orcc #IntMasks disable IRQs while setting up hardware
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112 sta PRstReg,x reset 6551
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113 std CmdReg,x set command and control registers
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114 lda >PIA1Base+3 get PIA CART* input control register
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115 anda #$FC clear PIA CART* control bits
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116 sta >PIA1Base+3 disable PIA CART* FIRQs
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117 lda >PIA1Base+2 clear possible pending PIA CART* FIRQ
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118 lda #$01 GIME CART* IRQ enable
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119 ora <D.IRQER mask in current GIME IRQ enables
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120 sta <D.IRQER save GIME CART* IRQ enable shadow register
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121 sta >IrqEnR enable GIME CART* IRQs
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122 ldb DataReg,x *ensure old error,
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123 ldb StatReg,x *Rx data, and
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124 ldb DataReg,x *IRQ flags
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125 ldb StatReg,x *are clear
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126 andb Pkt.Mask,pcr IRQ bits still set?
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127 bne InitErr yes, go disable ACIA and return...
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128 lda SlotSlct,pcr get MPI slot select value
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129 bmi InitExit no MPI slot select, go exit...
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130 sta >MPI.Slct set MPI slot select register
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131 puls pc,cc recover original regs, return...
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132
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133 Term pshs cc save regs we alter
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134 orcc #IntMasks mask IRQs while disabling ACIA
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135 InitErr ldx M$Mem,pcr get base address
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136 lda #TIC.RTS!Cmd.RxIE!Cmd.DTR *disable all
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137 sta CmdReg,x *ACIA IRQs
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138 puls cc
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139 leax StatReg,x point to status register
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140 tfr x,d copy status register address
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141 ldx #$0000 remove IRQ table entry
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142 leay IRQSvc,pcr
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143 os9 F$IRQ
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144 InitExit rts
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145
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146 SSJoyBtn ldb #$FF
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147 ldx #PIA0Base
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148 stb $02,x
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149 ldb ,x
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150 comb
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151 andb #$0F
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152 rts
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153
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154 SSMsBtn pshs cc
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155 orcc #IntMasks
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156 lda ,u
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157 tfr a,b
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158 andb #$C0
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159 bne L0120
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160 bita #$20
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161 beq L011A
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162 orb #$03
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163 L011A bita #$10
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164 beq L0120
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165 orb #$0C
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166 L0120 anda #$3F
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167 sta ,u
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168 puls pc,cc
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169
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170 SSMsXY ldd #$017E
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171 pshs cc
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172 orcc #IntMasks
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173 ldx CrntXPos,u
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174 subd CrntYPos,u
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175 lsra
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176 rorb
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177 tfr d,y
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178 puls pc,cc
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179
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180 ***
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181 * Mouse IRQ service routine.
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182 *
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183 * INPUT: A = flipped and masked device status byte
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184 * U = mouse data area address
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185 *
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186 * OUTPUT: updated serial mouse data
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187 * CC Carry clear
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188 * D, X, Y, and U registers may be altered
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189 *
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190 * ERROR OUTPUT: none
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191 IRQSvc ldx M$Mem,pcr
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192 bita #Stat.Err any error(s)?
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193 beq ChkRDRF no, go check Rx data
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194 ldb DataReg,x read Rx data register to clear error flags
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195 ClrRxCnt lda Btn.Cntr,u get current button status and Rx data counter
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196 anda #^BC.RxCnt clear Rx data counter
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197 ButnExit sta Btn.Cntr,u reset Rx mouse data counter to wait for sync...
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198 IRQExit clrb clear Carry to mark IRQ serviced
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199 rts
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200
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201 ChkRDRF bita #Stat.RxF Rx data?
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202 beq IRQExit no, but this branch should never be taken...
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203 ldb DataReg,x get Rx data
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204 lda Btn.Cntr,u get button status and Rx counter
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205 anda #BC.RxCnt waiting for sync with mouse data?
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206 bne ChkOfst no, go check Rx offset...
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207 tfr b,a copy Rx data
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208 anda #SyncMask clear button status bits
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209 cmpa #SyncData is it *PROBABLY* the initial (sync) byte?
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210 bne IRQExit no, just ignore it...
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211 comb invert button bits to match SS.Mouse format
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212 lslb *move button
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213 lslb *status into
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214 lslb *bits 5-3
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215 andb #BC.Butns clear everything but the button bits
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216 incb set Rx counter to first XY position byte
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217 pshs b
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218 lda ,u
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219 bita #$08
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220 beq L017A
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221 bitb #$08
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222 bne L017A
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223 lda #$C0
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224 ldx CrntXPos,u
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225 cmpx #$0140
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226 bcs L017A
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227 lsla
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228 L017A anda #$C0
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229 ora ,s+
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230 bra ButnExit go save new button status and Rx counter, exit...
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231 ChkOfst cmpa #PcktSize-1 last byte in mouse packet?
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232 bcs SaveData no, go save mouse data to Rx buffer...
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233 ldx #HResMaxY*2 get maximum Y position
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234 pshs x save it for CalcPos subroutine
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235 leax CrntYPos,u point to current Y position
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236 leay Buffer+1,u point to primary Y offset
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237 bsr CalcPos go calculate & save mouse's new Y position
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238 ldb Buffer+2,u get mouse packet's secondary X offset
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239 ldx #HResMaxX get maximum X position
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240 stx ,s save it for CalcPos subroutine
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241 leax CrntXPos,u point to current X position
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242 leay Buffer+0,u point to primary X offset
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243 bsr CalcPos go calculate & save mouse's new X position
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244 leas 2,s clean up stack
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245 bra ClrRxCnt go save button status and clear Rx counter, exit...
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246 SaveData stb a,u save XY position byte to mouse data Rx buffer
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247 inc Btn.Cntr,u point to next byte in Rx buffer
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248 clrb clear Carry to mark IRQ serviced
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249 rts
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250
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251 CalcPos sex sign extend mouse packet's 2nd XY offset ([D] = -128 to +127)
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252 pshs d save it temporarily...
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253 ldb ,y get mouse packet's 1st XY offset
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254 sex sign extend it ([D] = -128 to +127)
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255 addd ,s add mouse's 2nd XY offset
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256 std ,s save XY offset total temporarily...
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257 bpl PosAdjst go de-sensitize positive "ballistic" XY offset...
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258 orb #%00000111 if -8<XYoffset<0, no "ballistic" response
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259 addd #1 "fix" negative offset "ballistic" response
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260 bra RShiftD go calculate "ballistic" offset...
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261 PosAdjst andb #%11111000 if 0<XYoffset<8, no "ballistic" response
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262 RShiftD asra *calculate 50% of XY offset
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263 rorb *for "ballistic" response
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264 addd ,s++ add original XY offset total, clean up stack
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265 addd ,x add mouse's current XY position
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266 bpl CheckPos zero or positive XY position, go check it...
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267 clra *set minimum
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268 clrb *XY position
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269 CheckPos cmpd 2,s past maximum XY position?
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270 bls SavePos no, go save it...
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271 ldd 2,s get maximum XY position
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272 SavePos std ,x save new XY position
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273 rts
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274
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275 emod
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276 eom equ *
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277 end
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