reading vic20 or c64 column

From: didier derny <didier_at_aida.org>
Date: Mon, 29 Jun 2015 21:58:24 +0200
Message-ID: <5591A360.3050704@aida.org> 
Is the Vic20 or C64 writing in the row and reading the column or the 
reverse ?

frankly I knew but  I totally forgot

I found a few web sites but not so clear...


thanks

--
didier



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