On Tuesday 30 September 2008 16:43, Chuck Guzis wrote:
Didn't Motorola package one if its early
mask-programmed RTL ROMs as
a standard BCD-to-seven segment part?
I remember that, but if you wanted more bits either way than the number of
bits the chip was set up for their app info had you cascading some absurd
number of them.
I can't think of why you'd want to cascaed 7-segment decoders in this
way, and wonder if you're thinking of the BCD <-> binary converter chips
that wrre in the Texas TTL range (and which were, I think, programmed
ROMs). 74184 and 74185 I think.
Cascading thos certainly used a lot of said chips, and it was not obvious
at first glance how to extend the cascading for an arbitrary word size.
-tony