2 Nov
2010
2 Nov
'10
12:38 p.m.
On 1 Nov 2010 at 16:28, alan canning wrote:
Strictly a PROM is combinatorial logic :-).
My origianl puzzle (which I don't know the best answer for...) was to
make a full hxadecimal 7 segment driver using 74xx TTL parts ('and
preferably common ones) and no programmable devices (no PROMS, PALs, etc).
I didn;t forbit sequential logic, although it's hard to see why it would
be useful.
-tony
I must admit I have not read thru all the posts
so if somebody else
suggested this my apologies. Why not a one chip solution; use a 74S188
and program whatever you want the character set to be (i.e. hook or no
hook on 6s, etc. )?
That's where we started. Tony wanted to see what the minimum in
combinatorial logic would be. To date, I've not seen a solution that