On Wednesday 01 October 2008 16:26, Tony Duell wrote:
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.
Whoops, you're right, that's exactly what I was thinking of, though I'm
pretty sure I was also remembering Motorola...
Perhaps one of those two companies was second-sourcing the other.
All of my databooks are currently in boxes, and I'm not even sure which ones
are in what boxes, a situation that I'm hoping to correct somtime soon, so
I can't verify my recollection on this.
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.
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