RE: [N8VEM-S100:7420] GAL 22V10

["Bob Bell" <bbel...@gmail.com>]

 Hi, greg,

I shop around on these sites:

http://www.anchor-electronics.com/price-list.pdf
http://avnetexpress.avnet.com/store/em/EMController?langId=-1&storeId=500201&catalogId=500201&action=home
http://www.digikey.com/
http://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDisplay?storeId=10001&catalogId=10001&langId=-1
http://www.mouser.com/
http://www.unicornelectronics.com/

They might not all have the same parts, or at the same times.  I have yet to find the "perfect" value/price on GALs.

The two parts I use the most, and seem to find the most in other designs are the 16V8 and the 22V10.
However, I also have a couple of 20V8's.

There are a wide variety of speeds (15nS, 10nS, etc.) and power (standard, half, quarter, etc.).  These factors all affect the price to some extent, although sometimes I run across logical anomalies and end up with faster / lower power parts than I would otherwise buy just because they are cheaper for some reason.

Also, be aware that not all programmers will program every manufacturer and every part .  I once bought a MiniPro TL866 "Universal Programmer" to program EPROMs, uProcessors, and GALS.  Then I bought GALs without a thought to the programmer compatibility (it was "universal", right?)  When the GALs arrived, they were Atmel and unsupported by the MiniPro.  Since Atmel is one of the few manufacturers actually still making GALs, and figuring on them being a common part for the foreseeable future, I bit the bullet and bought a second programmer, a Wellon VP-290.  Their compatibility list has many varieties of the Atmel GAL 16V8, and the Wellon comes recommended by several in this group.

And one last thing...after you have been doing GALs for a little while, you'll most likely discover their big cousins, the CPLD's.  Whereas GAL's are also known as SPLD's (Simple Programmable Logic Device), and they replace, typically, 4 to 6 SSI/MSI TTL-like chips, CPLD's (Complex Programmable Logic Devices) typically replace 4 to 6 GALs.  If you need a programmer, and before buying it, you might want think into the future a little bit to see if CPLD's are there, and if so, make sure the programmer you buy can program those too.

Hope this helps.

Bob Bell


-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of G. Beat
Sent: Thursday, July 16, 2015 7:33 PM
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:7420] GAL 22V10

Thanks to Batronix, I was able to upgrade my programming suite to handle GAL programming.
The Euro/Dollar exchange rate helped -- a bit.

Since my universe has been PROM, EPROM, EEPROM over the past 30 years -- I am looking for the best source for GAL purchase (brand, price, and within N8VEM/S-100 designers planned component selections) for the parts drawer.  Known Quantity breaks helpful.

greg
chicago

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