(Your job back in the day – and maybe still in some places – might have been to enter thousands of numbers on the keypad *per hour*. Small things like that added up.
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Today, if you ever press Cmd+A to type over a possibly maligned password after your fingers slip and you’re no longer sure, you are perpetuating this old gesture… but using a new shortcut.)
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Replying to @mwichary
All I can contribute is that Clear was in the Lisa keymap by July, 1981 https://archive.org/details/Lisa_Hardware_Reference_Manual_1981-07-07_Apple/page/n35 …pic.twitter.com/TDn7CcTA1G
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Replying to @enf1 reply 0 retweets 1 like
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Replying to @mwichary
Nice find! (A shame again here that the text has been reset instead of preserving the exact original, though.) Interesting that CODE (later Option) got the top-left spot, not a place you would normally find a modifier key. Very weird to see ZXCU for Cut Paste Copy Undo
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Replying to @enf
I probably have the original PDF somewhere, if you want me to grab it – at the time, it felt better to do it this way.
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Replying to @mwichary
Oh I didn't even realize that was your own site! But yes I'd be interested to see the scan if you find it
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Replying to @enf
A small precedent for top-left modifier keys: IBM 5291 and its Command.pic.twitter.com/7DTaKqzDTb
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And – I just noticed – arrow keys on the left. 
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One more: CODE in the upper left corner. This is the CPT 8100 word processor.pic.twitter.com/TNTg1k0Kjs
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