It’s been [del]years[/del] decades, but this turkey still owns the category as the WORST-designed piece of crap on so many levels that it will be hard to dethrone. The SummaSketch tablet circa 1994 for Macintosh.
When plugged in, it would emit a very high-pitched eeeeeeeeeee squeal that would gradually do a dentist-drill number on your brain.
The driver for it, rather than installing itself as an “INIT” (System Extension) into your Extensions folder the way Mac drivers of that era were supposed to, would make edits to the actual System file. That meant that every time you upgraded your OS (e.g., from System 7.5.3 to 7.5.5) you’d have to reinstall the damn tablet driver. This was in an era when Mac users never reinstalled anything. Not even when buying a new computer! We’d just drag all the extensions, control panels, and preferences from the old computer to the new one. So it was a totally foreign experience to have to hold onto the damn diskette and do reinstalls periodically.
The tablet’s surface area had to be mapped to your screen — when you first installed it (or reinstalled it, dammit), putting your pen in the far upper left hand corner of the TABLET did not correspond to moving the arrow cursor to the far upper left corner of the SCREEN. You had to set the x, y coordinates, using the control panel, until the point corresponding to far upper left on tablet was indeed far upper left on screen. Do you concede that this was pretty awful? Oh, but it gets worse.
You see, it’s the Control Panel I need to tell you about. If I may channel Sam Seaborn, it was oh so bad in so many ways. I have no true screen shot but here is the general idea of what you were confronted with when you brought it up.
a) Note the boxes containing the numbers. You might THINK that you could tap the far upper left corner of the tablet, see where the mouse arrow goes, then use the KEYBOARD to type in a number and hit enter and see where the mouse hops to, repeat with refinements, then hit Tab to go to the other axis and repeat. You might THINK that but you woud be WRONG. No keyboard entry accepted.
b) So upon realizing this you might THINK: “If I had to use the tablet & pen to enter the coordinates, that means the position of my cursor arrow on screen is NOT AT the far upper left, it’s in the middle of the Control Panel dialog making the adjustments. So how would I know when I’m at the right numbers?” And this time you’d be right. Oh, but it gets worse.
c) Notice the scrolly arrows, up and down, by each coordinate’s number. Imagine centering your cursor arrow over the downward pointing scrolly arrow in order to reduce the number for the X axis. One tap changes it from 204 to 203, the next tap from 203 to 202, and so on. So realizing this you might THINK “OK so I will first tab far upper left on the SummaSketch and SEE how far off from the screen’s far-upper-left I seem to be, then I’ll go to the Control Panel and tap the up or down arrow as many times as I would GUESS would move it that far, and then retest”. Well, an interesting thing happens on your third or fourth tap: your cursor, having moved one pixel to the left (or right) onscreen with each tap, is no longer on the damn arrow. Yes, your changes take effect as you make them. The OK button is just to dismiss the dialog when you’re done.