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126 .IX Title "INTERCAL::Charset::Hollerith 3pm"
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127 .TH INTERCAL::Charset::Hollerith 3pm "2008-03-29" "perl v5.14.2" "User Contributed Perl Documentation"
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128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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129 .\" way too many mistakes in technical documents.
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130 .if n .ad l
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131 .nh
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132 .SH "NAME"
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133 Charset::Hollerith \- allows to use Hollerith string constants in ASCII programs (and v.v.)
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134 .SH "SYNOPSIS"
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135 .IX Header "SYNOPSIS"
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136 .Vb 1
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137 \& use Charset::Hollerith qw(hollerith2ascii);
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138 \&
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139 \& my $a = hollerith2ascii "(Hollerith text)";
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140 .Ve
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141 .SH "DESCRIPTION"
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142 .IX Header "DESCRIPTION"
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143 \&\fICharset::Hollerith\fR defines functions to convert between a subset of \s-1ASCII\s0
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144 and a subset of nonstandard Hollerith (since there isn't such a thing as a
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145 standard
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146 Hollerith we defined our own variant which is guaranteed to be incompatible
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147 with all versions of Hollerith used by \s-1IBM\s0 hardware \- however, for each
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148 character code we have used the code used by some (but not all) \s-1IBM\s0 card
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149 reader, if the code exists in Hollerith at all, or we have made one up
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150 in some logical way (such as overpunching) if no \s-1IBM\s0 hardware had that
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151 particular character.
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152 .PP
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153 The two functions \fIhollerith2ascii\fR and \fIascii2hollerith\fR are exportable
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154 but not exported by default. They do the obvious thing to their argument.
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155 .SH "HOLLERITH CHARACTER TABLE"
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156 .IX Header "HOLLERITH CHARACTER TABLE"
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157 A Hollerith string is a sequence of 12\-bit characters; they are encoded as
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158 two \s-1ASCII\s0 characters, containing 6 bits each: the first character contains
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159 punches 12, 0, 2, 4, 6, 8 and the second character contains punches 11, 1,
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160 3, 5, 7, 9; interleaving the two characters gives the original 12 bits.
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161 To make the characters printable on \s-1ASCII\s0 terminals, bit 7 is always set to 0,
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162 and bit 6 is set to the complement of bit 5. These two bits are ignored when
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163 reading Hollerith cards.
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164 .PP
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165 Some Hollerith characters (produced by overpunching) can be converted
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166 to sequences of \s-1ASCII\s0 characters; \fIascii2hollerith\fR will correctly
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167 recognise the sequences.
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168 .PP
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169 The following punched cards document the encoding of characters (the last
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170 three symbols at the end nongraphic symbols in \s-1ASCII\s0; the previous two
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171 symbols correspond to multicharacter sequences):
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172 .PP
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173 .Vb 10
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174 \& \*(Aq !"#$%&()*+,\-./:;<=>?@[\e]^_\`{|}~XX0123456789
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175 \& 12 * * * * * * * * * * 12
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176 \& 11 * * * * ** ** * * * 11
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177 \& 0 * * * * **** * * *** 0
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178 \& 1 * * * 1
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179 \& 2 * * * * * 2
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180 \& 3 ** * * * * 3
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181 \& 4 *** * * ** * * * * 4
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182 \& 5 * * * * * * 5
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183 \& 6 * * ** * * 6
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184 \& 7 * *** * * 7
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185 \& 8 * ******** * * ******* * * * * * 8
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186 \& 9 * * * 9
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187 \&
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188 \& ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrs
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189 \& 12 ********* ********* 12
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190 \& 11 ********* ********* 11
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191 \& 0 ********* * * 0
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192 \& 1 * * ** ** * 1
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193 \& 2 * * * ** ** * 2
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194 \& 3 * * * ** ** 3
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195 \& 4 * * * ** ** 4
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196 \& 5 * * * ** ** 5
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197 \& 6 * * * ** ** 6
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198 \& 7 * * * ** ** 7
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199 \& 8 * * * ** ** 8
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200 \& 9 * * * * * 9
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201 \&
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202 \& tuvwxyz [] ". NL CR HT
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203 \& 12 * * * 12
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204 \& 11 * 11
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205 \& 0 ******* * * 0
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206 \& 1 * * * 1
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207 \& 2 * * * * 2
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208 \& 3 ** * * * * 3
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209 \& 4 ** * * * * 4
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210 \& 5 ** * * * 5
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211 \& 6 ** * * * 6
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212 \& 7 ** * * * * * 7
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213 \& 8 ** * * * * 8
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214 \& 9 * * * * 9
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215 .Ve
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216 .PP
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217 \&\s-1PLEASE\s0 \s-1NOTE\s0 that versions of CLC-INTERCAL before 1.\-94.\-2 had a bug which
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218 caused a rabbit to be represented as 12\-3\-2\-8 instead of 12\-3\-7\-8. Cards
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219 punched with such older versions, and containing rabbits, will need to be
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220 copied with one of the rabbit holes moved from row 2 to row 7.
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221 .SH "COPYRIGHT"
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222 .IX Header "COPYRIGHT"
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223 This module is part of CLC-INTERCAL.
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224 .PP
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225 Copyright (C) 2000, 2002, 2006, 2007 Claudio Calvelli, all rights reserved
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226 .PP
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227 See the files \s-1README\s0 and \s-1COPYING\s0 in the distribution for information.
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228 .SH "SEE ALSO"
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229 .IX Header "SEE ALSO"
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230 A qualified psychiatrist.
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