[TUHS] Off-topic: any logic designers here?

[Peter Jeremy]

On 2017-Aug-08 12:52:36 +1000, Warren Toomey <wkt at tuhs.org> wrote:
>Hi all, sorry for this off-topic posting.

Well, just promise to port Unix to it and it won't be off-topic.

>Anyway, I thought it would be fun to do something similar but with
>a bigger address space and as few chips as I could get away with.

Well, using a FPGA or microcontroller will reduce the chip count further.

You suggest that you won't use a 74LS181 because they are no longer made.
Whilst that's true, they are still readily available as NOS.  Overall, I
would suggest that using a 74LS181 (or 4) is a cleaner solution than
(ab)using a couple of EPROMs.  (The other option would be a PAL or GAL but
I suspect finding and programming them would be more difficult).

-- 
Peter Jeremy
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