AMD bit-slice machines

Tony Duell ard at
Sat Dec 31 17:33:59 CST 2005

> Is there some really interesting documentation available for these
> chips and maybe some microcode for some really simple task?  I'd like
> to really understand how bit-slice CPUs do work to form something like
> a VAX CPU.

Remember the 2901 is just the ALU, 16 4-bit registers, and the associated 
interconnection circuity (multiplexers, etc). If you understand how those 
work, understnad propagate/generate carry, and know how to make a 
microcoded CPU in general, then there is little more to learn for the 2901.

That said, there is a very good book on the 2900 series called 'Bit Slice 
Microprocessor Design' by Mick and Brick (no, those names are not a 
joke). It's not easy to find (or at least it took me some time to find 
it), but it does contain several examples of 2900-based circuits with the 


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