<https://atariage.com/forums/topic/318173-atari-800-replacement-keyboard/#comment-4785259>
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"The official key spacing being in imperial measurements rather than metric or mils, I switched my PCB software over so that I could further divide the placement grid. \n\t \n\tIn imperial measurements, a key space is 3/4\" by 3/4\".   \n\t \n\tIn order to get the right key offsets and wider key sizes, you basically need increments of 1/4 key width, and for some reason my PCB software wouldn't let me divide the 19.05mm value into grid squares 1/4 that size because it didn't like the number of decimal places.   \n\t \n\tWith a grid size of 0.1875\" I found I could easily snap the key objects to the grid at exactly the spacing I needed, and then flip back over to mils or mm for everything else. \n\t \n\tThe top two rows are 15 units wide, so 11 1/4 inches total width.   \n\tThe next two rows are a half a key unit narrower, indenting 1/4 unit on either side.  So, 10 7/8\" wide. \n\tThe spacebar is 9 units wide, so 6 3/4\" \n\t \n\t(My keyboard is different, as I found that it seems difficult to source a 9U spacebar, but I did find a 4U, which left me room for 5 additional keys (and potential room for more if I wants a 2U spacebar or just wanted to use keyswitches to stabilize the 4U bar.) \n\t \n \n\n\n\t \n\t \n\t \n\t \n \n"
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