A3000 Logic Chips: U202, U203, U701, U714

[metalman]

 Noticed this ebay listing

A3000 Logic Chips U202, U203, U701, U714

Anyone know what problems or symptoms are associated with failure of the original chips that replacing them with these new chips would repair?

[metalman]

Castellen wrote:
I've written some additional information on these programmable logic devices here.  I can also supply a set of 4 programmed Lattice devices for US$21 *including* worldwide freight.

Video speckles & random disk errors!

I've observed both problems, so I NEED replacemets!

Questions:

Are there any practical differences between the Atmel GAL chips vs Lattice GAL chips on power consumption, speed, ect.

Would substituting faster than 25ns chips as replacement chips have any advantages.

[metalman]

Castellen wrote:
If these devices are the cause of your problems, you're likely to notice video problems after the computer has been running for a short time.  It'll probably be cool when you first power it on, so usually you won't see problems until it's started heating up.

The video sparkles and the harddrive read problems show up after the computor is on for a while, elapsed time until random problems develope seems to be getting shorter.

Castellen wrote:
Same goes for the speed, even the slowest GAL devices are fast enough for operation in the A3000.  There's no advantage in paying extra for the faster rated parts.

The cost difference is very minimal for 25ns vs 15ns chips. I'm asking if there might be some theoretical advantage, however slight.


Do you have a Paypall account?