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1 ********************************************************************
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2 * RS232 - CoCo bit-banger 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 * 7 Tandy/Microware original version
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9
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10 nam RS232
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11 ttl CoCo bit-banger driver
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12
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13 * Disassembled 98/08/23 17:32:49 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 $07
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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 /RS232/
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39 fcb edition
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40
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41 L0014 fcb $04
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42 fcb $82
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43 fcb $01
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44 fcb $A2 "
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45 fcb $00
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46 fcb $CD M
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47 fcb $00
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48 fcb $63 c
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49 fcb $00
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50 fcb $2D -
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51 fcb $00
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52 fcb $13
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53 fcb $00
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54 fcb $05
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55
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56 start lbra Init
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57 lbra Read
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58 lbra Write
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59 lbra GetStat
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60 lbra SetStat
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61 lbra Term
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62
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63 * Init
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64 *
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65 * Entry:
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66 * Y = address of device descriptor
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67 * U = address of device memory area
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68 *
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69 * Exit:
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70 * CC = carry set on error
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71 * B = error code
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72 *
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73 Init pshs cc
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74 orcc #IntMasks
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75 ldx #PIA.U8
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76 clr $01,x
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77 ldd <IT.COL,y get col/row bytes
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78 std <u0024,u
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79 lda #$FE
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80 sta ,x
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81 lda #$36
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82 sta $01,x
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83 lda ,x
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84 ldd <IT.PAR,y get parity/baud
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85 lbsr L014D
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86 puls cc
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87 clrb
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88
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89 * Term
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90 *
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91 * Entry:
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92 * U = address of device memory area
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93 *
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94 * Exit:
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95 * CC = carry set on error
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96 * B = error code
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97 *
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98 Term rts
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99
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100 * Read
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101 *
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102 * Entry:
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103 * Y = address of path descriptor
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104 * U = address of device memory area
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105 *
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106 * Exit:
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107 * A = character read
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108 * CC = carry set on error
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109 * B = error code
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110 *
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111 Read bsr L00B1
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112 bcs L00CD
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113 ldb #$08
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114 pshs b,cc
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115 tst <u001E,u
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116 beq L0066
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117 dec $01,s
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118 L0066 bra L006E
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119 L0068 ldx #$0001
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120 os9 F$Sleep
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121 L006E lda >PIA.U8+2
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122 lsra
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123 pshs x,a
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124 lda >$FF69
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125 bpl L0091
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126 lda >PIA.U8+3
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127 bita #$01
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128 beq L0091
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129 bita #$80
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130 beq L0091
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131 orcc #Entire
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132 leax <L0091,pcr
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133 pshs x
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134 pshs u,y,x,dp,b,a,cc
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135 jmp [D.SvcIRQ]
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136 L0091 puls x,a
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137 bcs L0068
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138 orcc #IntMasks
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139 clra
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140 bsr L00DA
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141 L009A bsr L00D3
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142 ldb >PIA.U8+2
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143 lsrb
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144 rora
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145 dec $01,s
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146 bne L009A
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147 bsr L00DA
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148 tst <u001E,u
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149 beq L00AD
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150 lsra
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151 L00AD puls b,cc
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152 clrb
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153 rts
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154 L00B1 pshs a
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155 lda <PD.BAU,y
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156 anda #$0F
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157 cmpa #$07
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158 bcc L00C9
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159 lsla
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160 leax >L0014,pcr
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161 ldd a,x
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162 std <u0020,u
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163 clrb
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164 puls pc,a
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165 L00C9 ldb #$CB
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166 puls a
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167 L00CD orcc #Carry
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168 rts
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169 L00D0 stb >PIA.U8
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170 L00D3 pshs b,a
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171 ldd <u0020,u
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172 bra L00E1
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173 L00DA pshs b,a
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174 ldd <u0020,u
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175 lsra
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176 rorb
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177 L00E1 subd #$0001
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178 bne L00E1
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179 puls pc,b,a
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180
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181 * Write
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182 *
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183 * Entry:
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184 * A = character to write
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185 * Y = address of path descriptor
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186 * U = address of device memory area
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187 *
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188 * Exit:
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189 * CC = carry set on error
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190 * B = error code
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191 *
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192 Write bsr L00B1
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193 bcs L00CD
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194 ldb #$09
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195 pshs b,cc
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196 orcc #IntMasks
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197 tst <u001E,u
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198 beq L00F9
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199 dec $01,s
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200 L00F9 andcc #^Carry
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201 L00FB ldb #$02
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202 bcs L0100
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203 clrb
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204 L0100 bsr L00D0
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205 lsra
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206 dec $01,s
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207 bne L00FB
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208 ldb <u001D,u
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209 beq L0110
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210 andb #$FE
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211 bsr L00D0
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212 L0110 ldb #$02
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213 bsr L00D0
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214 tst <u001F,u
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215 beq L011D
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216 ldb #$02
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217 bsr L00D0
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218 L011D puls pc,b,cc
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219
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220 * GetStat
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221 *
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222 * Entry:
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223 * A = function code
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224 * Y = address of path descriptor
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225 * U = address of device memory area
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226 *
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227 * Exit:
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228 * CC = carry set on error
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229 * B = error code
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230 *
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231 GetStat cmpa #SS.EOF
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232 bne L0125
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233 L0123 clrb
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234 rts
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235 L0125 ldx PD.RGS,y
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236 cmpa #SS.ScSiz
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237 beq L0136
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238 cmpa #SS.ComSt
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239 bne L0183
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240 ldd <u0022,u
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241 std R$Y,x
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242 bra L0123
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243 L0136 ldx PD.RGS,y
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244 clra
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245 ldb <u0024,u
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246 std R$X,x
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247 ldb <u0025,u
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248 std R$Y,x
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249 bra L0123
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250
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251 * SetStat
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252 *
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253 * Entry:
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254 * A = function code
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255 * Y = address of path descriptor
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256 * U = address of device memory area
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257 *
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258 * Exit:
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259 * CC = carry set on error
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260 * B = error code
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261 *
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262 SetStat cmpa #SS.ComSt
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263 bne L0183
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264 ldx PD.RGS,y
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265 ldd R$Y,x
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266 L014D std <u0022,u
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267 clra
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268 clrb
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269 std <u001D,u
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270 sta <u001F,u
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271 ldd <u0022,u
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272 tstb
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273 bpl L0161
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274 inc <u001F,u
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275 L0161 bitb #$40
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276 bne L017F
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277 bitb #$20
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278 beq L016C
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279 inc <u001E,u
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280 L016C bita #$20
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281 beq L017E
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282 bita #$80
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283 beq L017F
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284 inc <u001D,u
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285 bita #$40
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286 bne L017E
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287 inc <u001D,u
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288 L017E rts
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289 L017F comb
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290 ldb <E$BMode
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291 rts
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292 L0183 comb
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293 ldb #E$UnkSvc
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294 rts
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295
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296 emod
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297 eom equ *
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298 end
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299
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