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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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201
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8 * 7 From Tandy OS-9 Level One VR 02.00.00
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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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201
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23 edition set 7
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0
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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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205
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31 BaudCnt rmb 2 baud rate counter
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0
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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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205
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41 BaudTbl fdb $0482 110 baud
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42 fdb $01A2 300 baud
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43 fdb $00CD 600 baud
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44 fdb $0063 1200 baud
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45 fdb $002D 2400 baud
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46 fdb $0013 4800 baud
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47 fdb $0005 9600 baud
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0
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48
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49 start lbra Init
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50 lbra Read
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51 lbra Write
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52 lbra GetStat
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53 lbra SetStat
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54 lbra Term
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55
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56 * Init
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57 *
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58 * Entry:
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59 * Y = address of device descriptor
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60 * U = address of device memory area
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61 *
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62 * Exit:
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63 * CC = carry set on error
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64 * B = error code
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65 *
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66 Init pshs cc
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67 orcc #IntMasks
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68 ldx #PIA.U8
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69 clr $01,x
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70 ldd <IT.COL,y get col/row bytes
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71 std <u0024,u
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72 lda #$FE
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73 sta ,x
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74 lda #$36
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75 sta $01,x
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76 lda ,x
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77 ldd <IT.PAR,y get parity/baud
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78 lbsr L014D
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79 puls cc
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80 clrb
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81
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82 * Term
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83 *
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84 * Entry:
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85 * U = address of device memory area
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86 *
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87 * Exit:
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88 * CC = carry set on error
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89 * B = error code
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90 *
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91 Term rts
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92
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93 * Read
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94 *
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95 * Entry:
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96 * Y = address of path descriptor
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97 * U = address of device memory area
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98 *
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99 * Exit:
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100 * A = character read
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101 * CC = carry set on error
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102 * B = error code
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103 *
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104 Read bsr L00B1
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105 bcs L00CD
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106 ldb #$08
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107 pshs b,cc
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108 tst <u001E,u
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109 beq L0066
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110 dec $01,s
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111 L0066 bra L006E
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112 L0068 ldx #$0001
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113 os9 F$Sleep
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114 L006E lda >PIA.U8+2
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115 lsra
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116 pshs x,a
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117 lda >$FF69
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118 bpl L0091
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119 lda >PIA.U8+3
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120 bita #$01
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121 beq L0091
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122 bita #$80
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123 beq L0091
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124 orcc #Entire
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125 leax <L0091,pcr
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126 pshs x
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127 pshs u,y,x,dp,b,a,cc
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128 jmp [D.SvcIRQ]
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129 L0091 puls x,a
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130 bcs L0068
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131 orcc #IntMasks
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132 clra
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133 bsr L00DA
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134 L009A bsr L00D3
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135 ldb >PIA.U8+2
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136 lsrb
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137 rora
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138 dec $01,s
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139 bne L009A
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140 bsr L00DA
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141 tst <u001E,u
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142 beq L00AD
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143 lsra
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144 L00AD puls b,cc
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145 clrb
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146 rts
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147 L00B1 pshs a
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148 lda <PD.BAU,y
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205
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149 anda #$0F mask out baud rate
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150 cmpa #B19200
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0
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151 bcc L00C9
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152 lsla
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205
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153 leax >BaudTbl,pcr
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0
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154 ldd a,x
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205
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155 std <BaudCnt,u
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0
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156 clrb
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157 puls pc,a
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205
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158 L00C9 ldb #E$BMode
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0
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159 puls a
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160 L00CD orcc #Carry
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161 rts
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162 L00D0 stb >PIA.U8
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163 L00D3 pshs b,a
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205
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164 ldd <BaudCnt,u
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0
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165 bra L00E1
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166 L00DA pshs b,a
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205
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167 ldd <BaudCnt,u
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0
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168 lsra
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169 rorb
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170 L00E1 subd #$0001
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171 bne L00E1
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172 puls pc,b,a
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173
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174 * Write
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175 *
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176 * Entry:
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177 * A = character to write
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178 * Y = address of path descriptor
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179 * U = address of device memory area
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180 *
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181 * Exit:
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182 * CC = carry set on error
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183 * B = error code
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184 *
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185 Write bsr L00B1
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186 bcs L00CD
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187 ldb #$09
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188 pshs b,cc
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189 orcc #IntMasks
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190 tst <u001E,u
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191 beq L00F9
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192 dec $01,s
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193 L00F9 andcc #^Carry
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194 L00FB ldb #$02
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195 bcs L0100
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196 clrb
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197 L0100 bsr L00D0
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198 lsra
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199 dec $01,s
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200 bne L00FB
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201 ldb <u001D,u
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202 beq L0110
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203 andb #$FE
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204 bsr L00D0
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205 L0110 ldb #$02
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206 bsr L00D0
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207 tst <u001F,u
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208 beq L011D
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209 ldb #$02
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210 bsr L00D0
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211 L011D puls pc,b,cc
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212
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213 * GetStat
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214 *
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215 * Entry:
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216 * A = function code
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217 * Y = address of path descriptor
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218 * U = address of device memory area
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219 *
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220 * Exit:
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221 * CC = carry set on error
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222 * B = error code
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223 *
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224 GetStat cmpa #SS.EOF
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225 bne L0125
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226 L0123 clrb
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227 rts
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228 L0125 ldx PD.RGS,y
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229 cmpa #SS.ScSiz
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230 beq L0136
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231 cmpa #SS.ComSt
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232 bne L0183
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233 ldd <u0022,u
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234 std R$Y,x
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235 bra L0123
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236 L0136 ldx PD.RGS,y
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237 clra
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238 ldb <u0024,u
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239 std R$X,x
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240 ldb <u0025,u
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241 std R$Y,x
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242 bra L0123
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243
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244 * SetStat
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245 *
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246 * Entry:
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247 * A = function code
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248 * Y = address of path descriptor
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249 * U = address of device memory area
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250 *
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251 * Exit:
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252 * CC = carry set on error
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253 * B = error code
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254 *
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255 SetStat cmpa #SS.ComSt
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256 bne L0183
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257 ldx PD.RGS,y
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258 ldd R$Y,x
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259 L014D std <u0022,u
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260 clra
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261 clrb
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262 std <u001D,u
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263 sta <u001F,u
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264 ldd <u0022,u
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265 tstb
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266 bpl L0161
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267 inc <u001F,u
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268 L0161 bitb #$40
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269 bne L017F
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270 bitb #$20
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271 beq L016C
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272 inc <u001E,u
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273 L016C bita #$20
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274 beq L017E
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275 bita #$80
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276 beq L017F
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277 inc <u001D,u
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278 bita #$40
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279 bne L017E
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280 inc <u001D,u
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281 L017E rts
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282 L017F comb
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283 ldb <E$BMode
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284 rts
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285 L0183 comb
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286 ldb #E$UnkSvc
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287 rts
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288
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289 emod
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290 eom equ *
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291 end
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292
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