TTL computing

From: Richard Erlacher <edick_at_idcomm.com>
Date: Fri Apr 12 13:30:28 2002

I'm afraid that the Nixies are too large for this handheld application.

Dick

----- Original Message -----
From: "Ben Franchuk" <bfranchuk_at_jetnet.ab.ca>
To: <classiccmp_at_classiccmp.org>
Sent: Friday, April 12, 2002 10:46 AM
Subject: Re: TTL computing


> Richard Erlacher wrote:
>
> > It doesn't help having all the unused states represented in your ROM.
> > Discrete implementations and programmable devices both cover all the
REQUIRED
> > states, and having other states supported is certainly unnecessary, as
well as
> > potentially hazardous.
> The advantage of a prom it is easier to change than hard wiring,
> provided you have a programer. Since I am having problems with getting
> my FPGA cpu a serial prom I just may endup using TTL and hard wiring the
> logic. If nothing else it looks impressive on several boards.:)
>
> > >
> > > BTW B.G micro does sell 74LS170's, and AM2901's.
> >
> > I've not needed a '170 in over two decades. I do have a supply of '670's,
> > which are the tristate version of the same device, and I just this week
> > finished an application using a couple of them in a display application.
> > They're pretty handy when you have no synchronization between the inputs
and
> > outputs, and, as was the case in this 7-segment display device, when your
> > inputs are byte-wide, and outputs are nybble-wide.
> > > --
>
> Ok then how about some NICE NIXIE TUBES then (grin).
> --
> Ben Franchuk - Dawn * 12/24 bit cpu *
> www.jetnet.ab.ca/users/bfranchuk/index.html
>
>
Received on Fri Apr 12 2002 - 13:30:28 BST