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1 ********************************************************************
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2 * SSPak - Speech-Sound Pak Text-To-Speech Driver
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3 *
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4 * $Id$
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5 *
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6 * by Bruce Isted (CIS 76625,2273)
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7 * released to the Public Domain 87/05/03
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8 *
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9 * This driver supports only the Speech-Sound Pak's text-to-speech mode.
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10 * Bit 7 is cleared and control codes are filtered to ensure that only carriage
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11 * returns and characters in the range of $20-$7F (inclusive) are passed. A
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12 * character count and automatic buffer flush is used, which should prevent
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13 * buffer overflow in the Speech-Sound Pak.
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14 *
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15 * Due to way the COCO's sound select circuitry is tied in with other sound
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16 * sources and the joysticks, only one will function at a time. This means
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17 * that while the Speech-Sound Pak is active other sound sources and/or the
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18 * joysticks cannot be used. Speech output is enabled only when a carriage
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19 * return is received, or when the buffer is flushed. Speech output is
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20 * disabled as soon as the Speech-Sound Pak is finished speaking the string
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21 * received before the carriage return or buffer flush.
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22 *
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23 * Ed. Comments Who YY/MM/DD
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24 * ------------------------------------------------------------------
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25 * 1 Created BRI 87/05/03
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26
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27 nam SSPak
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28 ttl Speech-Sound Pak Text-To-Speech Driver
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29
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30 ifp1
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31 use defsfile
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32 endc
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33
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34 BuffCnt equ 200 character count before flushing buffer (0-255)
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35 BusyBit equ %10000000 SSPak busy status bit (active low)
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36 CharMask equ %01111111 printable ASCII character mask
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37 CRA equ $01 PIA CRA offset
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38 CRB equ $03 PIA CRB offset
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39 MUXBit equ %00001000 COCO sound MUX control/select bit position
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40 SpeakBit equ %01000000 SSPak speech status bit (active low)
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41 SSPData equ $01 SSPak data register offset
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42 SSPReset equ $00 SSPak reset register offset
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43 SSPStat equ $01 SSPak status register offset
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44
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45 rev equ $01
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46 edition set 1
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47
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48 mod SEnd,SNam,Drivr+Objct,ReEnt+rev,SEntry,SMem
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49
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50 org V.SCF SCF manager data area
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51 Count rmb 1 character counter
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52 SMem equ .
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53
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54 fcb SHARE.+PWRIT.+WRITE. device capabilities
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55
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56 SNam fcs "SSPak"
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57 fcb edition
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58
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59 SEntry lbra SInit
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60 lbra SRead
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61 lbra SWrite
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62 lbra SGetStat
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63 lbra SSetStat
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64 lbra STerm
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65
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66 SInit equ *
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67 STerm equ *
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68 ldx V.PORT,u
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69 ldb #$01
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70 stb SSPReset,x reset SSPak
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71 clrb
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72 stb SSPReset,x end SSPak reset
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73 rts
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74
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75 SRead comb
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76 ldb #E$BMode
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77 rts
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78
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79 SWrite anda #CharMask strip MSBit of character
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80 cmpa #C$CR carriage return?
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81 beq SpkOut yes, go enable SSPak speech output
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82 inc Count,u increment character counter
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83 cmpa #C$SPAC higher than space?
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84 bhi WritChar yes, go write character to SSPak
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85 lda #C$SPAC only space allowed through here
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86 ldb Count,u get current character count
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87 cmpb #BuffCnt time to flush buffer?
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88 blo WritChar no, go write space to SSPak
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89 SpkOut clr Count,u reset character count
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90 ldy #PIA0Base
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91 lda CRA,y get PIA0 CRA
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92 ldb CRB,y get PIA0 CRB
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93 pshs d save them
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94 anda #^MUXBit clear PIA0 CA2 control LSBit
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95 orb #MUXBit set PIA0 CB2 control LSBit
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96 sta CRA,y * set COCO sound MUX to cartridge input
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97 stb CRB,y *
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98 ldy #PIA1Base
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99 ldb CRB,y get PIA1 CRB
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100 pshs b save it
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101 orb #MUXBit set PIA1 CB2 control LSBit
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102 stb CRB,y enable COCO sound MUX
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103 lda #C$CR load execute speech character
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104 bsr WritChar go write command character to SSPak
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105 bsr SSWait go wait until SSPak has finished
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106 puls b recover original PIA1 CRB
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107 stb CRB,y disable COCO sound MUX
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108 puls d recover original PIA0 CRA & CRB
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109 ldy #PIA0Base
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110 sta CRA,y *restore COCO sound MUX to previous setting
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111 stb CRB,y *
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112 clrb
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113 rts
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114 WritChar bsr BusyWait go check if SSPak is busy
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115 sta SSPData,x write character to SSPak
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116 clrb
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117 rts
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118
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119 SGetStat equ *
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120 SSetStat equ *
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121 comb
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122 ldb #E$UnkSvc
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123 rts
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124
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125 BusyWait ldx V.PORT,u
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126 ldb SSPStat,x get SSPak status
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127 andb #BusyBit SSPak busy?
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128 beq BusyWait yes, go check again
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129 ldb SSPStat,x *allow for slow busy bit
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130 andb #BusyBit *
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131 beq BusyWait *
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132 ldb SSPStat,x *allow for very slow busy bit
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133 andb #BusyBit *
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134 beq BusyWait *
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135 rts
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136
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137 SSWait ldx V.PORT,u
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138 ldb SSPStat,x get SSPak status
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139 andb #SpeakBit SSPak speech active yet?
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140 bne SSWait no, go check again
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141 SSWait0 ldx #$0001 sleep remainder of tick
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142 os9 F$Sleep
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143 ldx V.PORT,u
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144 ldb SSPStat,x get SSPak status
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145 andb #SpeakBit SSPak speech still active?
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146 beq SSWait0 yes, go sleep some more
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147 rts
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148
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149 emod
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150 SEnd equ *
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151 end
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152
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