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1 ********************************************************************
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2 * KeyDrv - Keyboard Driver for CoCo 3
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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 * 4 L2 Upgrade distribution version
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9 * Annotations by Robert Gault RG 98/10/10
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10
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11 nam KeyDrv
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12 ttl Keyboard Driver for CoCo 3
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13
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14 * Disassembled 98/09/09 09:02:10 by Disasm v1.6 (C) 1988 by RML
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15
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16 ifp1
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17 use defsfile
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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 equ 4
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24
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25 mod eom,name,tylg,atrv,start,size
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26 size equ .
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27
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28 name fcs /KeyDrv/
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29 fcb edition
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30
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31 start lbra Init init/term; CLRB RTS
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32 lbra Term
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33 lbra FuncKeys test for keys F1, F2
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34
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35 ReadKys ldu <D.CCMem CC3IO global memory $1000
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36 ldx #PIA0Base base address of PIA#1
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37 clrb
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38 comb
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39 stb $02,x clear all strobe lines
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40 ldb ,x read PIA#1
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41 comb bit values 0=off 1=on
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42 andb #%00001111 keep only buttons
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43 bne L0059 branch if button pushed; error routine
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44 clr $02,x enable all strobe lines
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45 lda ,x read PIA#1
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46 coma
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47 anda #%01111111 mask only the joystick conparator
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48 beq L0042 branch if no keys pressed
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49 pshs dp
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50 tfr u,d
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51 tfr a,dp set DP to the address in regU
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52 bsr L005C evaluate the found key matrix
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53 puls dp return to system DP
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54 bpl L005B valid key
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55 L0042 clra regA would have been the found key
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56 ldb <G.CapLok,u CapsLock/SysRq key down flag
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57 bne L0056
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58 clr <G.KTblLC,u Key table entry# last checked (1-3)
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59 coma
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60 comb
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61 sta <G.LKeyCd,u last keyboard code
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62 sta <G.2Key1,u 2nd key table storage; $FF=none
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63 std <G.2Key2,u format (Row/Column)
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64 L0056 clr <G.CapLok,u see above
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65 L0059 ldb #$FF
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66 L005B rts
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67
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68 L005C ldx #PIA0Base base value of PIA#1
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69 clra
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70 clrb
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71 std <G.ShftDn shift/CTRL flag; 0=NO $FF=YES
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72 std <G.KeyFlg PIA bits/ALT flag
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73 * %00000111-Column # (Output, 0-7)
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74 * %00111000-Row # (Input, 0-6)
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75 coma
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76 comb set primary key table
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77 std <G.Key1 key 1&2 flags $FF=none
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78 sta <G.Key3 key 3 ²
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79 deca ie. lda #%11111110
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80 sta $02,x strobe one column
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81 L006E lda ,x read PIA#1
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82 coma
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83 anda #$7F keep only keys, bit 0=off 1=on
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84 beq L0082
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85 ldb #$FF preset counter to -1
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86 L0077 incb
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87 lsra bit test regA
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88 bcc L007E no key so branch
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89 lbsr L010E convert column/row to matrix value and store it
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90 L007E cmpb #$06 max counter
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91 bcs L0077 loop if more bits to test
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92 L0082 inc <G.KeyFlg counter; used here for column
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93 orcc #Carry bit marker; disable strobe
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94 rol $02,x shift to next column
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95 bcs L006E not finished with columns so loop
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96 lbsr L0166 simultaneous check; recover key matrix value
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97 bmi L00F5 invalid so go
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98 cmpa <G.LKeyCd last keyboard code
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99 bne L0095
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100 inc <G.KySame same key flag ?counter?
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101 L0095 sta <G.LKeyCd setup for last key pressed
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102 beq L00B5
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103 suba #$1A the key value (matrix) of Z
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104 bhi L00B5 not a letter so go
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105 adda #$1A restore regA
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106 ldb <G.CntlDn CTRL flag
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107 bne L00E0 CTRL is down so go
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108 adda #$40 convert to ASCII value; all caps
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109 ldb <G.ShftDn shift key flag
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110 ldy <G.CurDev get current device static memory pointer
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111 eorb <$21,y caps lock and keyboard mouse flags
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112 andb #$01 test caps flag
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113 bne L00E0 not shifted so go
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114 adda #$20 convert to ASCII lower case
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115 bra L00E0
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116 * key is not a letter; this routine is not based on some underlining principle of
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117 * the keyboard hardware. It is also a function of the decode table at $1DC,pcr.
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118 L00B5 ldb #$03
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119 mul regB = (key#-26) times 3
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120 lda <G.ShftDn shift key flag
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121 beq L00BF not shifted so go
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122 incb
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123 bra L00C5
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124 L00BF lda <G.CntlDn CTRL flag
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125 beq L00C5
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126 addb #$02
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127 L00C5 ldx <G.CurDev point regX to device’s static memory
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128 lda <$22,x key sense flag
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129 beq L00D0 not set so go
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130 cmpb #$11 spacebar
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131 ble L00F3 must be an arrow so go
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132 L00D0 cmpb #$4C SHIFTed ALT key
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133 blt L00D8 not ALT, CTRL, F1, F2, or SHIFT so go
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134 inc <G.AltDwn flag special keys (ALT,CTRL)
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135 subb #$06
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136 L00D8 leax >L01DC,pcr decode table
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137 lda b,x
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138 bmi L00F6 if regA = $81 - $84
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139 * several entries to this routine from any key press; regA is already ASCII
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140 L00E0 ldb <G.AltDwn was ALT flagged?
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141 beq L00F0 no so go
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142 cmpa #$3F ?
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143 bls L00EE # or code
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144 cmpa #$5B [
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145 bcc L00EE capital letter so go
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146 ora #$20 convert to lower case
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147 L00EE ora #$80 set for ALT characters
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148 L00F0 andcc #^Negative not negative
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149 rts
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150 L00F3 orcc #Negative set negative
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151 L00F5 rts
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152 L00F6 inc <G.CapLok caps lock/SysRq
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153 inc <G.Clear one shot caps lock/SysRq
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154 bra L00F0
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155 L00FC pshs b,a convert column into power of 2
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156 clrb
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157 orcc #Carry
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158 inca
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159 L0102 rolb
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160 deca
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161 bne L0102
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162 bra L0108 WHY IS THIS HERE??
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163 L0108 orb <G.KySns previous value of column
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164 stb <G.KySns
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165 puls pc,b,a
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166 L010E pshs b,a
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167 cmpb #$03 is it row 3?
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168 bne L011C
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169 lda <G.KeyFlg get column #
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170 cmpa #$03 is it column 3?; ie up arrow
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171 blt L011C if lt must be a letter
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172 bsr L00FC its a non letter so bsr
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173 L011C lslb B*8 8 keys per row
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174 lslb
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175 lslb
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176 addb <G.KeyFlg add in the column #
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177 cmpb #$33 ALT
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178 bne L012B
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179 inc <G.AltDwn ALT down flag
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180 ldb #$04
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181 bra L0108
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182 L012B cmpb #$34 CTRL
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183 bne L0135
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184 inc <G.CntlDn CTRL down flag
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185 ldb #$02
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186 bra L0108
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187 L0135 cmpb #$37 shift key
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188 bne L013F
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189 com <G.ShftDn shift down flag
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190 ldb #$01
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191 bra L0108
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192 * check how many key (1-3) are currently being pressed
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193 L013F pshs x
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194 leax <$2D,u 1st key table
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195 bsr L014A
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196 puls x
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197 puls pc,b,a
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198 L014A pshs a
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199 lda ,x
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200 bpl L0156
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201 stb ,x
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202 ldb #$01
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203 puls pc,a
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204 L0156 lda $01,x
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205 bpl L0160
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206 stb $01,x
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207 ldb #$02
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208 puls pc,a
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209 L0160 stb $02,x
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210 ldb #$03
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211 puls pc,a
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212 * simlutaneous key test
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213 L0166 pshs y,x,b
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214 ldb <G.KTblLC key table entry#
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215 beq L019D
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216 leax <$2A,u point to 2nd key table
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217 pshs b
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218 L0171 leay <$2D,u 1st key table
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219 ldb #$03
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220 lda ,x get key#1
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221 bmi L018F go if invalid? (no key)
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222 L017A cmpa ,y is it a match?
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223 bne L0184 go if not a matched key
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224 clr ,y
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225 com ,y set value to $FF
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226 bra L018F
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227 L0184 leay $01,y
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228 decb
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229 bne L017A
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230 lda #$FF
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231 sta ,x
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232 dec <G.KTblLC key table entry#
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233 L018F leax $01,x
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234 dec ,s column counter
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235 bne L0171
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236 leas $01,s
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237 ldb <G.KTblLC key table entry (can test for 3 simul keys)
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238 beq L019D
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239 bsr L01C4
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240 L019D leax <$2D,u 1st key table
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241 lda #$03
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242 L01A2 ldb ,x+
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243 bpl L01B5
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244 deca
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245 bne L01A2
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246 ldb <G.KTblLc key table entry (can test for 3 simul keys)
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247 beq L01C0
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248 decb
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249 leax <$2A,u 2nd key table
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250 lda b,x
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251 bra L01BE
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252 L01B5 tfr b,a
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253 leax <$2A,u 2nd key table
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254 bsr L014A
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255 stb <G.KTblLC
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256 L01BE puls pc,y,x,b
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257 L01C0 orcc #Negative flag negative
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258 puls pc,y,x,b
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259 L01C4 leax <$2A,u
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260 bsr L01CF
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261 leax $01,x
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262 bsr L01CF
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263 leax -$01,x
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264 L01CF lda ,x
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265 bpl L01DB
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266 ldb $01,x
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267 bmi L01DB
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268 sta $01,x
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269 stb ,x
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270 L01DB rts
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271 * These seem to be special key combination values; 3 per key in ASCII
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272 *L01DC fcb @,shift@,nul
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273 * fcb up,shifted,CTRL
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274 * fcb down, shifted, CTRLed
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275 * fcb left, shifted, CTRLed
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276 * fcb right, shifted, CTRLed
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277 * fcb spacebar, spacebar, spacebar
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278 * fcb ’0,’0,$81 signal shiftlock change
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279 * fcb ’1,’!,’|
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280 * fcb ’2,’”,null
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281 * fcb ’3,’#,’~
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282 * fcb ’4,’$,null
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283 * fcb ’5,’%,null
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284 * fcb ’6,’&,null
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285 * fcb ’7,’’,’^
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286 * fcb ’8,’(,’[
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287 * fcb ’9,’),’]
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288 * fcb ’:,’*,null
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289 * fcb ’;,’+,DEL
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290 * fcb ’,,’<,’{
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291 * fcb ’-,’=,’_
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292 * fcb ’.,’>,’}
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293 * fcb ’/,’?,’\
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294 * fcb ENTER,ENTER,ENTER
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295 * I think these are for ALT
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296 * fcb $82,$83,$84
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297 * fcb ENQ,BREAK,ESC
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298 * the next I think are for the F1 and F2 keys
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299 * fcb ’1,’3,’5
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300 * fcb ’2,’4,’6
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301 L01DC fdb $4060,$000c,$1c13,$0a1a,$1208,$1810,$0919,$1120
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302 fdb $2020,$3030,$8131,$217c,$3222,$0033,$237e,$3424
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303 fdb $0035,$2500,$3626,$0037,$275e,$3828,$5b39,$295d
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304 fdb $3a2a,$003b,$2b7f,$2c3c,$7b2d,$3d5f,$2e3e,$7d2f
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305 fdb $3f5c,$0d0d,$0d82,$8384,$0503,$1b31,$3335,$3234
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306 fcb $36
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307
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308 Init
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309 Term clrb
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310 rts
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311
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312 FuncKeys ldu <D.CCMem
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313 ldx #PIA0Base
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314 clra
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315 ldb #%11011111 strob column #6 PIA#1
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316 stb $02,x
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317 ldb ,x read PIA#1
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318 bitb #%01000000 test for F1 function key
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319 bne L0240
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320 inca flag F1
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321 L0240 ldb #%10111111 strobe column #7 PIA#1
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322 stb $02,x
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323 ldb ,x read PIA#1
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324 bitb #%01000000 test for F2 function key
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325 bne L024C
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326 ora #$04 flag F2
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327 L024C rts
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328
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329 emod
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330 eom equ *
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331 end
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332
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333
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