>Neat idea - but I think all those parts are made of unobtanium now.
>Bit-slice CPUs have certainly gone the way of the dodo. Even a lot of
>the MSI TTL stuff that you would have used in a CPU design - ALUs and so
>forth - have been discontinued. (You might be able to make replacements
>for some of the functions out of PALs.) Bipolar PROMs - another mainstay
>of such designs - are history, too, though CMOS parts have gotten fast
>enough that they might be able to fill in - or, if not, you could use
>SRAM that was loaded from ROM at boot time.

I think you will find the most recent versions of the 2901 family are still
available. Great things to have around. In one of my past incarnations I
serviced to chip level CPU cards that had processors built around these. It
was interesting to see how the different generations of the CPU family had
things tweaked to get around the chip speed limitations to get the CPU cycle
time down.

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