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Groups > sci.electronics.design > #518768 > unrolled thread

Need to construct the logical reverse of a 7448 - perhaps using a GAL

Started byJohn Robertson <spam@flippers.com>
First post2018-10-08 17:20 -0700
Last post2018-10-09 22:48 -0400
Articles 5 on this page of 45 — 13 participants

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  Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-08 17:20 -0700
    Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Jeff Liebermann <jeffl@cruzio.com> - 2018-10-08 18:57 -0700
      Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-08 19:08 -0700
      Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-08 19:13 -0700
        Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-08 19:27 -0700
          Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Jeff Liebermann <jeffl@cruzio.com> - 2018-10-08 21:06 -0700
            Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Jeff Liebermann <jeffl@cruzio.com> - 2018-10-08 21:36 -0700
      Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL gnuarm.deletethisbit@gmail.com - 2018-10-08 20:27 -0700
        Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-08 21:19 -0700
          Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Jeff Liebermann <jeffl@cruzio.com> - 2018-10-08 21:40 -0700
            Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-09 00:20 -0700
              Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL gnuarm.deletethisbit@gmail.com - 2018-10-10 15:43 -0700
                Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-10 18:46 -0700
          Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL gnuarm.deletethisbit@gmail.com - 2018-10-08 22:11 -0700
            Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-09 00:27 -0700
      Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Rob <nomail@example.com> - 2018-10-09 17:08 +0000
    Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL "tom" <tmiller11147@verizon.net> - 2018-10-09 00:15 -0400
      Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-09 00:26 -0700
        Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2018-10-09 14:23 +0200
          Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL jrwalliker@gmail.com - 2018-10-09 06:43 -0700
            Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-09 08:41 -0700
              Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL dplatt@coop.radagast.org (Dave Platt) - 2018-10-09 10:50 -0700
        Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Jeff Liebermann <jeffl@cruzio.com> - 2018-10-09 09:15 -0700
          Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-09 10:01 -0700
            Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2018-10-09 21:01 +0300
              Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-09 11:13 -0700
                Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL bitrex <user@example.net> - 2018-10-09 18:35 -0400
                  Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL TTman <kraken.sankey@gmail.com> - 2018-10-09 23:43 +0100
                    Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL bitrex <user@example.net> - 2018-10-09 19:49 -0400
                      Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL bitrex <user@example.net> - 2018-10-09 19:50 -0400
            Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Jeff Liebermann <jeffl@cruzio.com> - 2018-10-09 17:25 -0700
              Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-09 19:15 -0700
            Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL gnuarm.deletethisbit@gmail.com - 2018-10-10 16:46 -0700
              Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2018-10-11 02:08 +0200
                Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL gnuarm.deletethisbit@gmail.com - 2018-10-10 18:37 -0700
                  Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2018-10-11 13:35 +0200
        Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL gnuarm.deletethisbit@gmail.com - 2018-10-10 15:45 -0700
          Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-10 18:50 -0700
            Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL Jasen Betts <jasen@xnet.co.nz> - 2018-10-11 05:39 +0000
    Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL bitrex <user@example.net> - 2018-10-09 02:18 -0400
    Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL TTman <kraken.sankey@gmail.com> - 2018-10-09 17:51 +0100
      Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL bitrex <user@example.net> - 2018-10-09 17:38 -0400
    Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-09 17:52 -0700
      Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL John Robertson <spam@flippers.com> - 2018-10-09 19:16 -0700
      Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL bitrex <user@example.net> - 2018-10-09 22:48 -0400

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#518829

FromTTman <kraken.sankey@gmail.com>
Date2018-10-09 17:51 +0100
Message-ID<ppimb7$9pr$1@dont-email.me>
In reply to#518768
On 09-Oct-18 1:20 AM, John Robertson wrote:
> I am looking for a way to take the TTL level outputs (treating them as 
> inputs) of a 7448 and convert them back to the original BCD TTL input 
> levels (but as outputs) and I figured a simple socketed GAL would do the 
> trick for the least cost. However I don't have the skill set to build 
> the GAL logic table for this. Any suggestions? And no, I can't simply 
> remove the 7448 from the circuit.
> 
> Go easy on me here, I can unscrew hardware, but Boolean has never been 
> my forte...
> 
> Thanks!
> 
> John :-#)#
Use a single chip micro and a bit of software....But that might not be 
your 'thing' ...

---
This email has been checked for viruses by Avast antivirus software.
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#518842

Frombitrex <user@example.net>
Date2018-10-09 17:38 -0400
Message-ID<xd9vD.84315$xI1.70904@fx13.iad>
In reply to#518829
On 10/09/2018 12:51 PM, TTman wrote:
> On 09-Oct-18 1:20 AM, John Robertson wrote:
>> I am looking for a way to take the TTL level outputs (treating them as 
>> inputs) of a 7448 and convert them back to the original BCD TTL input 
>> levels (but as outputs) and I figured a simple socketed GAL would do 
>> the trick for the least cost. However I don't have the skill set to 
>> build the GAL logic table for this. Any suggestions? And no, I can't 
>> simply remove the 7448 from the circuit.
>>
>> Go easy on me here, I can unscrew hardware, but Boolean has never been 
>> my forte...
>>
>> Thanks!
>>
>> John :-#)#
> Use a single chip micro and a bit of software....But that might not be 
> your 'thing' ...


it took me about seven minutes to write the sketch of the code for that 
above, this thread will probably run on for weeks tho Oh Well

-
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>

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#518854

FromJohn Larkin <jjlarkin@highland_snip_technology.com>
Date2018-10-09 17:52 -0700
Message-ID<t3jqrddo9nqff19o8ojiuq79d64c5pqgn3@4ax.com>
In reply to#518768
On Mon, 8 Oct 2018 17:20:35 -0700, John Robertson <spam@flippers.com>
wrote:

>I am looking for a way to take the TTL level outputs (treating them as 
>inputs) of a 7448 and convert them back to the original BCD TTL input 
>levels (but as outputs) and I figured a simple socketed GAL would do the 
>trick for the least cost. However I don't have the skill set to build 
>the GAL logic table for this. Any suggestions? And no, I can't simply 
>remove the 7448 from the circuit.
>
>Go easy on me here, I can unscrew hardware, but Boolean has never been 
>my forte...
>
>Thanks!
>
>John :-#)#

We had a Noritake 16-segment 8-character VF display tube go
end-of-life, so we did a drop-in replacement board with an LCD and a
little uP. It nabs the scanned 16-seg drive on the fly and maps that
into the serial LCD. That saved redesigning/recoding four different
boxes that used the VF display board.


-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

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#518856

FromJohn Robertson <spam@flippers.com>
Date2018-10-09 19:16 -0700
Message-ID<jqmdnVJxMtmU_CDGnZ2dnUU7-ROdnZ2d@giganews.com>
In reply to#518854
On 2018/10/09 5:52 PM, John Larkin wrote:
> On Mon, 8 Oct 2018 17:20:35 -0700, John Robertson <spam@flippers.com>
> wrote:
> 
>> I am looking for a way to take the TTL level outputs (treating them as
>> inputs) of a 7448 and convert them back to the original BCD TTL input
>> levels (but as outputs) and I figured a simple socketed GAL would do the
>> trick for the least cost. However I don't have the skill set to build
>> the GAL logic table for this. Any suggestions? And no, I can't simply
>> remove the 7448 from the circuit.
>>
>> Go easy on me here, I can unscrew hardware, but Boolean has never been
>> my forte...
>>
>> Thanks!
>>
>> John :-#)#
> 
> We had a Noritake 16-segment 8-character VF display tube go
> end-of-life, so we did a drop-in replacement board with an LCD and a
> little uP. It nabs the scanned 16-seg drive on the fly and maps that
> into the serial LCD. That saved redesigning/recoding four different
> boxes that used the VF display board.
> 
> 

Our old Fluke 9100s and 9010s will need that sort of repair some day, 
but the Noritake displays seem to last and last, until hit by something 
hard that is...

John :-#)#

-- 
(Please post followups or tech inquiries to the USENET newsgroup)
                      John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
          (604)872-5757 (Pinballs, Jukes, Video Games)
                      www.flippers.com
        "Old pinballers never die, they just flip out."

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#518857

Frombitrex <user@example.net>
Date2018-10-09 22:48 -0400
Message-ID<9MdvD.117476$ZJ2.31167@fx33.iad>
In reply to#518854
On 10/09/2018 08:52 PM, John Larkin wrote:
> On Mon, 8 Oct 2018 17:20:35 -0700, John Robertson <spam@flippers.com>
> wrote:
> 
>> I am looking for a way to take the TTL level outputs (treating them as
>> inputs) of a 7448 and convert them back to the original BCD TTL input
>> levels (but as outputs) and I figured a simple socketed GAL would do the
>> trick for the least cost. However I don't have the skill set to build
>> the GAL logic table for this. Any suggestions? And no, I can't simply
>> remove the 7448 from the circuit.
>>
>> Go easy on me here, I can unscrew hardware, but Boolean has never been
>> my forte...
>>
>> Thanks!
>>
>> John :-#)#
> 
> We had a Noritake 16-segment 8-character VF display tube go
> end-of-life, so we did a drop-in replacement board with an LCD and a
> little uP. It nabs the scanned 16-seg drive on the fly and maps that
> into the serial LCD. That saved redesigning/recoding four different
> boxes that used the VF display board.
> 
> 

That's too bad, those Japanese-mfgr VFDs are much more civilized than 
the cheap China Special LED backlit LCDs. Also easier to view from an 
angle and in daylight

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