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| Subject | Re: Need to construct the logical reverse of a 7448 - perhaps using a GAL |
|---|---|
| Newsgroups | sci.electronics.design |
| References | (1 earlier) <pph9tk$9rl$1@dont-email.me> <UvSdnbpnaveTxSHGnZ2dnUU7-cfNnZ2d@giganews.com> <tokprdt7bhhu7p1ukuqls8nncsrl78fpg3@4ax.com> <OOadnbZHePdPQyHGnZ2dnUU7-IHNnZ2d@giganews.com> <j7gqrdh9m9i3hncljv64ceqrv38aelgiuc@4ax.com> |
| From | John Robertson <spam@flippers.com> |
| Date | 2018-10-09 19:15 -0700 |
| Message-ID | <jqmdnVNxMtk6_SDGnZ2dnUU7-RPNnZ2d@giganews.com> (permalink) |
On 2018/10/09 5:25 PM, Jeff Liebermann wrote:
> On Tue, 9 Oct 2018 10:01:05 -0700, John Robertson <spam@flippers.com>
> wrote:
>
>> On 2018/10/09 9:15 AM, Jeff Liebermann wrote:
>>> On Tue, 9 Oct 2018 00:26:06 -0700, John Robertson <spam@flippers.com>
>>> wrote:
>>>
>>>> Easy, but too big for my application. I guess I could use a tiny EPROM,
>>>> should have looked for that I guess. Got caught up in elegant solutions...
>>>
>>> Swell. Now you want it small. Perhaps something like a 28C16A:
>>> <https://www.digchip.com/datasheets/download_datasheet.php?id=548714&part-number=M28C16A>
>
>> Size isn't everything...(ducking)
>>
>> Other than being obsolete it would be fine. Perhaps you have a few dozen
>> to sell?
>> Otherwise I'll likely go with the overkill one: AT27C256R-70JU
>
> I see you want a 32PLCC package.
>
> I'm not selling parts, but there are plenty for sale on eBay.
> <https://www.ebay.com/sch/i.html?_nkw=28c16>
> If possible, try to get the "A" suffix version. Most are 24 pin DIP
> packages, which are probably too big. However, there are some smaller
> packages available. For example:
> <https://www.ebay.com/itm/3-PCS-ATMEL-AT28C16-20JC-IC-EEPROM-16KBIT-200NS-32PLCC-ATMEL/323143000067>
>
>> At $1.50 it is hard to beat.
>
> Looks like 28C16 EEPROMs are getting scarce, so the prices are high.
> You probably don't need an electrically erasable EPROM, so a burn once
> type is probably cheaper and good enough. I guess the AT27C256R is
> good enough.
Actually I am now leaning to using a SST39SF010A which are around $1US
in 25 lots from Digikey - I did get an assortment of PLC to DIP
adapters, so the 32 pin package is not a problem.
>
> I assume you have an EPROM burner. I have one of these:
> <https://www.ebay.com/itm/Willem-EPROM-programmer-BIOS-4-5/222933620416>
> The on board 32PLCC sockets should be useful. It's rather clumsy to
> use without a box, but since I don't use it very often, I can live
> with the inconvenience.
>
I have a bunch of Eprom burners, going back to an ancient Pro-Log which
reads and burns the odd 1702. My latest is a Xeltek Superpro 610P which
handles a lot of stuff I use, other than 1970s PROMs, so for those I
fire up one of my Data I/O 29Bs.
Way back when I wire-wrapped an Eprom copier that went from pairs of
2708s up to pairs of 2764s using jumper headers to select the operation.
Used that for copying ROMs to EPROMs before I could afford a computer
(Apple II clone was my first real computer) Still have those buried in
my spare parts area...
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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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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