http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=Checksummer 2026-08-09T04:23:19Z Revision history for this page on the wiki MediaWiki 1.19.2 http://fileformats.archiveteam.org/index.php?title=Checksummer&diff=49628&oldid=prev 2024-11-03T23:53:59Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 23:53, 3 November 2024</td> </tr><tr><td colspan="2" class="diff-lineno">Line 3:</td> <td colspan="2" class="diff-lineno">Line 3:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>|released=1985</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>|released=1985</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>'''Checksummer''' is a type-in program checker for Commodore used by the German 64'er <del class="diffchange diffchange-inline">magazine</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>'''Checksummer''' is a type-in program checker for Commodore used by the German <ins class="diffchange diffchange-inline">magazines </ins>64'er <ins class="diffchange diffchange-inline">and Happy Computer</ins>.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>To help readers by typewriting the program listings, at the begin of the year 1985 the little programming helpers [[MSE]] (Maschinenspracheeingabeeditor / Computer Code Editor / for Assembler-Listings) and Checksummer (Prüfsummenprogramm / to check the right BASIC-Codes) were published. In the next months the programming helpers were upgraded. Other German computer magazines published this helper-methods, too.</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>To help readers by typewriting the program listings, at the begin of the year 1985 the little programming helpers [[MSE]] (Maschinenspracheeingabeeditor / Computer Code Editor / for Assembler-Listings) and Checksummer (Prüfsummenprogramm / to check the right BASIC-Codes) were published. In the next months the programming helpers were upgraded. Other German computer magazines published this helper-methods, too.</div></td></tr> </table>

Parchivist http://fileformats.archiveteam.org/index.php?title=Checksummer&diff=49374&oldid=prev 2024-09-08T06:23:06Z

<p>Created page with &quot;{{FormatInfo |subcat=Error detection and correction |released=1985 }} &#039;&#039;&#039;Checksummer&#039;&#039;&#039; is a type-in program checker for Commodore used by the German 64&#039;er magazine. To help ...&quot;</p> <p><b>New page</b></p><div>{{FormatInfo<br /> |subcat=Error detection and correction<br /> |released=1985<br /> }}<br /> '''Checksummer''' is a type-in program checker for Commodore used by the German 64'er magazine.<br /> <br /> To help readers by typewriting the program listings, at the begin of the year 1985 the little programming helpers [[MSE]] (Maschinenspracheeingabeeditor / Computer Code Editor / for Assembler-Listings) and Checksummer (Prüfsummenprogramm / to check the right BASIC-Codes) were published. In the next months the programming helpers were upgraded. Other German computer magazines published this helper-methods, too.<br /> <br /> It produces a 000-255 checksum for each line.<br /> <br /> Checksums V1 and V2 sum the bytes of the tokenized line including the line number as a 16-bit number, with the exception of all $20 (spaces), which are ignored. The low byte gives the checksum.<br /> <br /> Checksummer V3 rolls each byte to the left by a certain number of bits before summing, starting with 0 bits at the first byte of the line, then each byte one bit more. Otherwise, the calculation corresponds to that of the older versions.<br /> <br /> <br /> == Sample Output ==<br /> [[File:Checksummer.jpg]]<br /> <br /> <br /> == Links ==<br /> * [https://www.c64-wiki.com/wiki/64'er Info about 64'er and Checksummer]<br /> * [https://www.c64-wiki.de/wiki/Checksummer German C64 wiki article about Checksummer]<br /> * [https://archive.org/details/64er_1985_01/page/72/mode/2up Checksummer] (64'er Jan 1985 pg 72)<br /> ** [https://diskmaster.textfiles.com/browse/8345/64er_Magazin_85-01_1985_Markt__Technik_de.d64 .d64/txt format] ([https://archive.org/details/64er_Magazin_85-01_1985_Markt_Technik_de backup])<br /> * [https://archive.org/details/64er.N12.1985.03/page/68/mode/2up Checksummer 2.0] (64'er Mar 1985 pg 68)<br /> ** [https://diskmaster.textfiles.com/browse/8347/64er_Magazin_85-03_1985_Markt__Technik_de.d64 .d64/txt format] ([https://archive.org/details/64er_Magazin_85-03_1985_Markt_Technik_de backup])<br /> * [https://archive.org/details/64er_sonderheft_1985_04/page/n5/mode/2up Checksummer 3.0] (64'er Apr 1985 pg 6)<br /> ** [https://diskmaster.textfiles.com/browse/8352/64er_Magazin_85-08_1985_Markt__Technik_de.d64 .d64/txt format] ([https://archive.org/details/64er_Magazin_85-08_1985_Markt_Technik_de backup])<br /> * [https://codeberg.org/pgeorgi/render64prg/src/commit/71cc613001424a3131e19c5e0b48163bcc7b2256/render64prg.js#L290 Javascript implementation of algorithm]</div>

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