From https://tech.cellfi.sh/
After researching a small lot of Rockwell AIM 65 R6500 Advanced Interactive Microcomputer, there seems to be small variations. Those deserve to be documented. First out, the keyboard variations.
Futaba FK-2054 keyboard found in serial number A43648, A43651, A43653 and A43654.
Stackpole Components 86-90-0030 keyboard found in serial number A31072.
HI-TEK 373-70125 keyboard found in serial number A11220
Futaba FK-2054 key side. Notice the straight line in Q and the plastic keyboard frame.
HI-TEK Part.No. 373-70125 key side. Notice the curly line in Q.
Stackpole Components 86-90-030 key side. Notice the curly line in Q key.
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