10 Aug
2017
10 Aug
'17
10:16 a.m.
On 2017-Aug-08 12:52:36 +1000, Warren Toomey <wkt(a)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