The Jonathan concept of modular slices was a copy of the Convergent Technologies NGEN family of computers. frogdesign sold Apple the same packaging they had done two years earlier for Convergent. See the product family here: http://bitsavers.informatik.uni-stuttgart.de/pdf/convergent/...
The concept isn't far removed from the S-100 [1]bus as seen in the Altair 8800, and you could probably find numerous other examples, weren't early IBM mainframes made up of standardised cards with a few nand gates on each?
