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Talk:Digital encoding of APL symbols

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This is an old revision of this page, as edited by HarJIT (talk | contribs) at 18:33, 30 October 2019 (HarJIT moved page Talk:APL (codepage) to Talk:Digital encoding of APL symbols: Despite what the article lede says, this article doesn't seem to be about any specific EBCDIC code page (such as Code page 293, which has its own article), but rather about input methods, Unicode representation etc (I actually just added what EBCDIC specifics it does list) so calling it "APL (codepage)" (suggesting an article about a single character encoding) isn't really representative of its content.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
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Underscored alphabetics:

When APL was first made available on IBM printing terminals in the 1960s, the typing element did not enough room for lower case a-z. Thus underscored alphabetics were an available way to get another "case". Possibly the Unicode designers thought that underscoring was a text attribute, not unlike the underscore, bold, italic, etc. as one would find in MS Word. This is not true with APL - underscored characters were distinct from non-underscored characters and allowed a kind of upper / lower case. Only A-Z and the "delta" symbol could be underscored. With the IBM 3279 display terminals, one could now have three alphabet cases in programs - upper and lower case, plus underscored characters.

Usage of underscored alphabetic characters are considered by many APL programmers to be obsolete, not modern, and in bad style. APL+Win has eliminated them from their version of the language. Other implementations still support them, but consider them deprecated.

188.60.207.142 (talk) 17:21, 28 May 2011 (UTC)[reply]

I've used APL on mainframe since the 70ies and still use it on my OS/2 PC today (for math). PC-APL started with lower-case instead of underline via the ALT-key. On mainframe programs (OS/360,OS/370, VM, ...) it was some kind of programmers agreement to use underlines for global variables between functions (same workspace), except for text-headlines, as a better way of readability. APL-workspaces have also been portable from mainframe to PC and i still use most if my statistical work downloaded up to now. Actual use some stochastic work on demographics. Beside FORTRAN-programs APL is my main "calculation suite" if Lotus123(OS/2) or Excel(Win) does not fit. regards from a retired IBM-Dinosaur....... — Preceding unsigned comment added by 79.247.7.235 (talk) 18:18, 27 February 2015 (UTC)[reply]

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Cheers.—InternetArchiveBot (Report bug) 07:42, 1 October 2016 (UTC)[reply]

The IBM code page 293 is gone. I didn't check others. David Lambert, 2019-MAR-01 — Preceding unsigned comment added by 69.204.222.194 (talk) 12:46, 1 March 2019 (UTC)[reply]

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