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31
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1 *******************************************
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2 * PTY
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3 * Device Driver for emulated terminal
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4 * Emulates the 6850 UART seen in usim
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5 * Protocol:
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6 * V.port is the control port.
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7 * V.port+1 is the data port. It is bidirectional.
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8 * bit 1: 1=data ready to read/0=no data
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9 * bit 2: 1=ready for output
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10 *
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11
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12 nam PTY
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13 ttl Pseudo Terminal
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14
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15 ifp1
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33
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16 use defsfile
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31
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17 endc
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18
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19 ***********************
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20 * Edition History
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21 *
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22 * # date Comments
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23 * - -------- -------------------------------
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24 * 1 16.11.01 Driver first written. SMR
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25
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26 Revision equ 1
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27
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28 org V.SCF
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29 PST equ .
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30
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31 mod PEND,PNAM,Drivr+Objct,Reent+Revision,PENT,PST
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32 fcb READ.+WRITE.
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33 PNAM fcs /PTY/
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34
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35 PENT lbra INIT
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36 lbra READ
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37 lbra WRITE
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38 lbra GETSTA
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39 lbra PUTSTA
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40 lbra TERM
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41
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42 **********************
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43 * INIT
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44 * Entry: U = Static storage
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45 * Setup the PIA
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46 *
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47 INIT clrb
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48 rts
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49
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50 **********************
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51 * READ
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52 * Entry: U = Static Storage
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53 * Y = Path Descriptor
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54 * Exit: A = Character read
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55 *
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56 * Read a byte from Port B
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57 *
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58 READ ldx V.PORT,u load port address
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59 readlp ldb ,x
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60 bitb #$01
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61 bne readbyte
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62 pshs x sleep for a bit if not
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63 ldx #1
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64 os9 f$sleep
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65 puls x
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66 bra readlp
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67 readbyte lda 1,x read byte
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68 clrb
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69 rts
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70 **********************
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71 * WRITE
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72 * Entry: U = Static storage
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73 * Y = Path Descriptor
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74 * A = Char to write
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75 *
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76 * Write a byte to Port B
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77 *
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78 WRITE ldx V.PORT,u load port address
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79 write1 ldb ,x
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80 bitb #$02
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81 bne wrt
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82 pshs x
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83 ldx #1
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84 os9 f$sleep
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85 puls x
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86 bra write1
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87 wrt sta 1,x write byte
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88 ok clrb
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89 rts
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90
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91 **********************
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92 * GETSTA
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93 * U = Static Storage
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94 * Y = Path Descriptor
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95 *
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96 GETSTA ldx PD.Rgs,y X=pointer to registers
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97 lda R$B,x A=contents of B reg.
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98 cmpa #SS.Ready check for ready code
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99 bne gsta1 if not, check next
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100 ldx V.Port,u use the PIA to determine
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101 ldb ,x if data is available
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102 bitb #$01
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103 bne ok
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104 ldb #E$NotRdy
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105 coma sets the carry flag
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106 rts
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107 gsta1 cmpa #SS.EOF check for eof code
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108 beq ok which always returns ok
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109 comb otherwise return
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110 ldb #E$UnkSVC unknown code error
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111 rts
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112
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113 **********************
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114 * PUTSTA
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115 * Always return error
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116 *
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117 PUTSTA ldx PD.Rgs,y X=register stack
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118 ldb R$B,x B=contents of reg B
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119 comb otherwise return error.
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120 ldb #E$UnkSVC
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121 rts
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122
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123 **********************
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124 * TERM
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125 * Terminate Driver
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126 *
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127 TERM clrb
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128 rts
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129
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130 emod
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131 PEND equ *
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132
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