<https://atariage.com/forums/topic/318173-atari-800-replacement-keyboard/#comment-4784928>
<http://schema.org/text>
"That makes sense. I'm not sure about other models, but for the 800, they used the same standard spacing still used on keyboards today. About 19mm or 3/4\" is 1 unit. Most of the keys are 1 unit, with the tab, return, and shift being 1.5 units, the left shift is 2 units and the spacebar is 9 units. I used a 19.05mm grid and it worked great. I laid it all out in kicad and then printed it out to make sure it fit where the original keyboard went before ordering the PCBs. The only real measuring I did was for the outline of the PCB and to figure out how tall to make the key adapters to keep them at the same height as the original. \n \n"
<https://atariage.com/forums/topic/318173-atari-800-replacement-keyboard/?tab=comments#comment-4871981>