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Article #14Re: X.400 and multimedia mail
From: Alasdair Grant
Date: Fri, 11 Dec 1992 20:19
Date: Fri, 11 Dec 1992 20:19
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In article <1galsqINNr88@gap.caltech.edu> jack@ccsf.caltech.edu (Jack Stewart) writes: >As I understand, the main reason for MIME to use base64 encoding (as >opposed to uuencode, 8bit transparent, XDR, or BER ) was that they >needed an encoded scheme that would remain uncorrupted accross all >platforms and architectures and existing mailers. Apparently this is >a real problem with IBM VM/CMS machines. base64 encoding was the only >thing that would survive these machines. Hopefully these machines >will go away some day and then we can use a more reasonable encoding >mechanism. Yes, but this is a minor problem compared to the presence of machines which use the 7-bit American ASCII code, where the top bit is a parity bit. EBCDIC, as used by VM/CMS (and MVS and DOS), is an 8-bit code. Neither uuencode nor base64 are 'reasonable', since they both 'waste' bandwidth, but the reason they exist is fundamentally because ASCII is a 7-bit code. By the way, there are lots of other machines which have even _fewer_ printable characters than VM/CMS.
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Newsgroups: comp.mail.mime Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!pavo.csi.cam.ac.uk!ag129 From: ag129@cus.cam.ac.uk (Alasdair Grant) Subject: Re: X.400 and multimedia mail Message-ID: <1992Dec11.201947.17868@infodev.cam.ac.uk> Sender: news@infodev.cam.ac.uk (USENET news) Nntp-Posting-Host: bootes.cus.cam.ac.uk Organization: U of Cambridge, England References: <davecb.724004446@yorku.ca> <1992Dec11.153138.2198@ericsson.se> <1galsqINNr88@gap.caltech.edu> Date: Fri, 11 Dec 1992 20:19:47 GMT Lines: 19