8080 Assembler-Text Editor (ATE)

Chuck Guzis cclist at sydex.com
Tue Apr 18 00:59:48 CDT 2006


On 4/18/2006 at 1:05 AM ard at p850ug1.demon.co.uk wrote:

>That said, I think it is a pity there wasn't a later TTL 7 segment 
>decoder chip (say a 74LS547 or something) that did display 0-F as you 
>might expect. 

Well, the MC4039 used the Moto XC170 mask ROM as its core.  The Moto data
sheet for the 170 mentions that codes 1010-1111 could be reprogrammed to
other characters.   The 4039 had 1010=blank, 1011=dot, 1100=hyphen,
1101-1111=blank. 

The MC14495 also does the hex-to-7 segment decoding.

Of course, one could always glom onto a few HP 5082-7340 displays...

Cheers,
Chuck







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