Mercurial > hg > Members > kono > nitros9-code

annotate level1/cmds/display.asm @ 2152:74fb212cb659

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Changelog comes from higher up
author boisy
date Wed, 14 May 2008 02:13:22 +0000
parents 84ea83668304
children 2996c407889b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ********************************************************************
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2 * Display - Character display utility
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3 *
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4 * $Id$
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5 *
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6 * Edt/Rev YYYY/MM/DD Modified by
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7 * Comment
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8 * ------------------------------------------------------------------
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9 * 2 ????/??/??
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10 * Original Tandy/Microware version.
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11 *
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12 * 3 ????/??/?? Alan DeKok
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13 * Added decimal, text features.
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14
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15 nam Display
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16 ttl Character display utility
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17
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18 * Disassembled 94/12/10 12:27:37 by Alan DeKok
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19
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20 ifp1
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21 use defsfile
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22 endc
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23
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24 tylg set Prgrm+Objct
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25 atrv set ReEnt+rev
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26 rev set $01
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27 edition set 3
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28
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29 mod eom,name,tylg,atrv,start,size
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30
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31 org 0
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32 T.Delim rmb 1 text delimiter
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33 D.Len rmb 1 length of decimal bytes: 0=1 byte, 1=2 bytes
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34 D.Word rmb 2 decimal byte to output
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35 rmb 200 room for the stack
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36 size equ .
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37
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38 name fcs /Display/
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39 fcb edition
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40
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41 Start pshs x save start address of text to output
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42 leay ,x destination buffer=input buffer (always shrinks it)
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43 leau Hex,pcr point to routine to ouput hex characters
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44
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45 Loop jsr ,u grab a character
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46 bcs S.01 if error, dump it
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47 stb ,x+ save character in internal buffer
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48 bra Loop and get another one
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49
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50 S.01 tfr x,d get current pointer into D
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51 subd ,s take out start address
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52 tfr d,y length of the data to print
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53 puls x restore start address
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54
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55 lda #$01 to STDOUT
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56 os9 I$Write dump it out
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57 bcs Exit exit if error
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58
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59 ClnExit clrb no error
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60 Exit os9 F$Exit and exit
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61
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62 Do.Hex leau <Hex,pcr point to main hex routine
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63 Hex ldb ,y+ grab a character
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64 cmpb #C$COMA comma?
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65 bne Hex.2 nope, do more checks
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66
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67 Hex.1 ldb ,y+ grab another character
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68 Hex.2 cmpb #C$SPAC space?
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69 beq Hex.1 yup, skip it
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70
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71 cmpb #'/ slash?
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72 beq Do.Text yes, go output straight text
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73 cmpb #'\ back-slash?
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74 beq Do.Text yes, output straight text
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75 cmpb #'" double-quote?
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76 beq Do.Text yes, output straight text
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77
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78 cmpb #C$PERD period?
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79 beq Decimal yes, do a one-time output of decimal byte(s)
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80
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81 leay -1,y
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82 bsr Nibble turn character in B into a nibble
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83 bcs OK.2
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84 pshs b save high nibble
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85 bsr Nibble get current character
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86 bcs Hex.3 skip move if next character is not a number
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87 lsl ,s move low nibble into high nibble
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88 lsl ,s
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89 lsl ,s - can't do it before now, because hex number
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90 lsl ,s might be 1 digit long
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91
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92 addb ,s add high nibble to low nibble
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93 stb ,s save it
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94 Hex.3 clrb no error
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95 puls b,pc restore byte to output, and exit
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96
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97 Nibble ldb ,y get the current character
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98 cmpb #C$CR end of parameters?
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99 beq Error yes, exit
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100
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101 cmpb #'0 error if B<'0'
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102 blo Error
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103
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104 cmpb #'9
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105 bls OK allow '0' to '9' inclusive
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106
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107 cmpb #'A error if B<'A'
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108 blo Error
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109
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110 andb #$DF make the character lowercase
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111 cmpb #'F
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112 bhi Error error if B>'F'
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113
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114 subb #$07 map 'A' down to $0A
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115 OK subb #$30 take out ascii zero, now B=nibble 0-F
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116
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117 OK.0 leay 1,y
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118 OK.1 clra set to no error
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119 OK.2 rts
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120
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121 Error comb set carry
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122 rts
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123
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124 Do.Text leau <Text,pcr
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125 stb <T.Delim save text delimiter
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126 Text ldb ,y+ grab a character
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127 cmpb <T.Delim text delimiter again?
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128 beq T.Check check for some stuff
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129 cmpb #C$CR end of text?
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130 beq Error yes, signal it
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131 bra OK.1 otherwise allow the character
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132
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133 T.Check lda ,y get the next character after the delimiter
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134 cmpa <T.Delim is it the same, i.e. 2 delimiters in a row?
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135 beq OK.0 yes, skip the second and output the first
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136 bra Do.Hex otherwise go to hex mode again
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137
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138 Decimal lda ,y get next character
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139 anda #$DF make it uppercase
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140 cmpa #'W force a word?
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141 bne D.One no, do a straight decimal conversion
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142 leay 1,y skip the 'w' character
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143 lda #1 force 2 bytes
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144 fcb $21 skip the 'clra' following
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145
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146 D.One clra force 1 byte (may expand to 2)
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147 sta <D.Len save length of the decimal character
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148
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149 clra start off at zero
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150 clrb
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151 std <D.Word sav starting value of the decimal word to output
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152
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153 D.Read lda ,y+ grab a decimal digit
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154 cmpa #C$CR done the list?
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155 beq D.CR yes, output the characters and then exit
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156
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157 cmpa #'0 smaller than zero?
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158 bls D.Done0 yes, we're done this decimal digit
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159 cmpa #'9
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160 bhi Error
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161 suba #'0 convert ascii to number
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162
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163 pshs a save the character for later
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164 ldd <D.Word get the current word
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165 aslb
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166 rola N*2
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167 aslb
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168 rola N*4
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169 aslb
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170 rola N*8
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171 addd <D.Word N*8+N=N*9
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172 addd <D.Word N*9+N=N*10
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173 addb ,s+ add in our latest character
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174 adca #0 make it 16-bit
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175 std <D.Word
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176 bra D.Read go get another character
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177
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178 D.Done0 leay -1,y point to character we've tried to convert to dec.
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179 D.Done ldd <D.Word get the byte(s) to output
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180 tst <D.Len check length flag
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181 bne D.Two if forcing 2 bytes, output them
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182 tst <D.Word is high byte zero?
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183 beq D.Exit yes, only output low order byte
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184
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185 D.Two sta ,x+ save high byte in the output buffer
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186 D.Exit clra
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187 rts
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188
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189 D.CR leau Error,pcr point to error routine: no more characters
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190 bra D.Done output these characters, and the exit
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191
0
6641a883d6b0 Initial revision
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192 emod
6641a883d6b0 Initial revision
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193 eom equ *
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194 end
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195