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1 ********************************************************************
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2 * SIO - CoCo 3 Serial driver
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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 * 9 Original Tandy L2 distribution version
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9
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10 nam SIO
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11 ttl CoCo 3 Serial driver
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12
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13 * Disassembled 98/08/23 20:58:36 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 scfdefs
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18 endc
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19
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20 tylg set Drivr+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 9
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24
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25 mod eom,name,tylg,atrv,start,size
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26
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27 u0000 rmb 29
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28 u001D rmb 1
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29 u001E rmb 1
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30 u001F rmb 1
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31 u0020 rmb 2
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32 u0022 rmb 2
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33 u0024 rmb 1
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34 u0025 rmb 1
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35 size equ .
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36 fcb $03
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37
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38 name fcs /SIO/
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39 fcb edition
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40
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41 L0012 fcb $09
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42 fcb $0C
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43 fcb $03
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44 fcb $4C L
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45 fcb $01
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46 fcb $A2 "
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47 fcb $00
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48 fcb $CE N
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49 fcb $00
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50 fcb $62 b
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51 fcb $00
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52 fcb $2E .
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53 fcb $00
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54 fcb $12
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55 fcb $00
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56 fcb $03
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57
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58 start lbra Init
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59 lbra Read
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60 lbra Write
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61 lbra GetStat
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62 lbra SetStat
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63 lbra Term
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64
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65 * Init
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66 *
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67 * Entry:
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68 * Y = address of device descriptor
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69 * U = address of device memory area
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70 *
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71 * Exit:
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72 * CC = carry set on error
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73 * B = error code
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74 *
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75 Init pshs cc
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76 orcc #IntMasks
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77 ldx #PIA1Base
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78 clr $01,x
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79 ldd <IT.COL,y get col/row bytes
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80 std <u0024,u
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81 lda #$FE
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82 sta ,x
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83 lda #$36
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84 sta $01,x
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85 lda ,x
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86 ldd <IT.PAR,y get parity/baud
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87 lbsr L0148
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88 puls cc
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89 clrb
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90
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91 * Term
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92 *
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93 * Entry:
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94 * U = address of device memory area
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95 *
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96 * Exit:
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97 * CC = carry set on error
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98 * B = error code
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99 *
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100 Term rts
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101
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102 * Read
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103 *
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104 * Entry:
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105 * Y = address of path descriptor
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106 * U = address of device memory area
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107 *
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108 * Exit:
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109 * A = character read
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110 * CC = carry set on error
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111 * B = error code
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112 *
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113 Read bsr L00AC
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114 bcs L00C8
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115 ldb #$08
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116 pshs b,cc
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117 tst <u001E,u
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118 beq L0066
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119 dec $01,s
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120 L0066 bra L0077
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121 L0068 lda <PD.BAU,y
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122 anda #$0F
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123 cmpa #$07
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124 beq L0077
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125 ldx #$0001
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126 os9 F$Sleep
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127 L0077 pshs y
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128 ldy #$FFFF
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129 L007D lda >PIA1Base+2
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130 leay -$01,y
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131 beq L008B
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132 lsra
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133 bcs L007D
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134 puls y
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135 bra L0090
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136 L008B puls y
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137 lsra
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138 bcs L0068
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139 L0090 orcc #IntMasks
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140 clra
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141 bsr L00D5
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142 L0095 bsr L00CE
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143 ldb >PIA1Base+2
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144 lsrb
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145 rora
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146 dec $01,s
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147 bne L0095
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148 bsr L00D5
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149 tst <u001E,u
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150 beq L00A8
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151 lsra
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152 L00A8 puls b,cc
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153 clrb
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154 rts
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155 L00AC pshs a
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156 lda <PD.BAU,y
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157 anda #$0F
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158 cmpa #$08
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159 bcc L00C4
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160 lsla
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161 leax >L0012,pcr
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162 ldd a,x
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163 std <u0020,u
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164 clrb
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165 puls pc,a
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166 L00C4 ldb #E$BMode
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167 puls a
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168 L00C8 orcc #Carry
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169 rts
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170 L00CB stb >PIA1Base
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171 L00CE pshs b,a
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172 ldd <u0020,u
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173 bra L00DC
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174 L00D5 pshs b,a
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175 ldd <u0020,u
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176 lsra
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177 rorb
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178 L00DC subd #$0001
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179 bne L00DC
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180 puls pc,b,a
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181
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182 * Write
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183 *
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184 * Entry:
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185 * A = character to write
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186 * Y = address of path descriptor
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187 * U = address of device memory area
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188 *
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189 * Exit:
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190 * CC = carry set on error
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191 * B = error code
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192 *
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193 Write bsr L00AC
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194 bcs L00C8
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195 ldb #$09
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196 pshs b,cc
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197 orcc #IntMasks
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198 tst <u001E,u
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199 beq L00F4
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200 dec $01,s
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201 L00F4 andcc #^Carry
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202 L00F6 ldb #$02
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203 bcs L00FB
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204 clrb
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205 L00FB bsr L00CB
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206 lsra
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207 dec $01,s
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208 bne L00F6
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209 ldb <u001D,u
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210 beq L010B
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211 andb #$FE
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212 bsr L00CB
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213 L010B ldb #$02
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214 bsr L00CB
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215 tst <u001F,u
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216 beq L0118
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217 ldb #$02
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218 bsr L00CB
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219 L0118 puls pc,b,cc
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220
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221 * GetStat
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222 *
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223 * Entry:
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224 * A = function code
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225 * Y = address of path descriptor
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226 * U = address of device memory area
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227 *
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228 * Exit:
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229 * CC = carry set on error
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230 * B = error code
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231 *
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232 GetStat cmpa #SS.EOF
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233 bne L0120
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234 L011E clrb
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235 rts
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236 L0120 ldx PD.RGS,y
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237 cmpa #SS.ScSiz
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238 beq L0131
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239 cmpa #SS.ComSt
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240 bne L017E
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241 ldd <u0022,u
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242 std R$Y,x
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243 bra L011E
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244 L0131 ldx PD.RGS,y
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245 clra
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246 ldb <u0024,u
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247 std R$X,x
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248 ldb <u0025,u
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249 std R$Y,x
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250 bra L011E
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251
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252 * SetStat
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253 *
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254 * Entry:
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255 * A = function code
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256 * Y = address of path descriptor
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257 * U = address of device memory area
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258 *
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259 * Exit:
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260 * CC = carry set on error
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261 * B = error code
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262 *
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263 SetStat cmpa #SS.ComSt
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264 bne L017E
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265 ldx PD.RGS,y
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266 ldd R$Y,x
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267 L0148 std <u0022,u
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268 clra
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269 clrb
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270 std <u001D,u
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271 sta <u001F,u
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272 ldd <u0022,u
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273 tstb
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274 bpl L015C
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275 inc <u001F,u
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276 L015C bitb #$40
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277 bne L017A
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278 bitb #$20
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279 beq L0167
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280 inc <u001E,u
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281 L0167 bita #$20
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282 beq L0179
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283 bita #$80
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284 beq L017A
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285 inc <u001D,u
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286 bita #$40
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287 bne L0179
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288 inc <u001D,u
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289 L0179 rts
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290 L017A comb
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291 ldb #E$BMode
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292 rts
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293 L017E comb
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294 ldb #E$UnkSvc
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295 rts
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296
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297 emod
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298 eom equ *
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299 end
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