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101-Key "Enhanced" Keyboard Layout
In 1986, IBM introduced the IBM PC/AT Model 339. Included in this last AT-family system was the new Enhanced 101-key keyboard. Little did IBM realize at the time, perhaps, but this 101-key keyboard would become the de-facto standard for keyboards for the next decade and beyond. Even today's Windows keyboards and fancy variants with extra buttons and keys are based on this layout.
The "Enhanced" keyboard was electrically the same as the 84-key AT keyboard, but featured a radically redesigned key layout. The major changes included these:
Compared the 84-key keyboard the Enhanced keyboard layout was perceived by most users to be far superior. It was an immediate hit despite its one obvious inferiority to the AT keyboard: the smaller main <Enter> key. (The <Space Bar> is also a bit smaller.) Obviously, some of the changes made with the Enhanced keyboard are undeniable. However, others are in this author's opinion good examples of the old warning: "be careful what you ask for"...
Many PC users, after having complained for years about changes they wanted made to the PC keyboard layout, found they weren't all that happy with them once their wish was granted! Having never complained about the issues that were changed with the Enhanced keyboard myself, I found some of the changes quite frustrating--and I later discovered that I was not alone. My personal beefs with this layout involve the locations of the following:
Despite these limitations, the 101-key keyboard remains the standard (actually, the 104-key Windows keyboard is the standard now, but the two layouts are nearly identical). Of course, countless variations of the basic design exist. A common modification is to enlarge the <Enter> key back to its "84-key layout size", and squeeze the backslash / vertical-pipe key between the "=/+" key and the <Backspace>. An improvement in my estimation!
As for me, rather than curse the darkness, I lit a candle: I use a 124-key Gateway Anykey programmable keyboard with function keys both above and to the left of the main typing area, and a large main <Enter> key. I relocate the left <Ctrl> to where it belongs and the <Caps Lock> key somewhere out of the way where it belongs. :^) I swap the <Esc> key and the backquote/tilde key as well. Ah, freedom. :^)