djnikko

Im looking to buy some of these so i can burn chips for my turbo D series '89 honda. there seems to be a load of different codings when looking for these chips, anything i need to bear in mind? DIP? PLCC?
27c? 27FS?
can anyone enlighten me, below is the link that confused me a little

http://www.progshop.com/shop/eproms/index.shtml

thanks

SOHCArchangel

i just got my atmel 29c256's in

and a zif socket too

.nate

Here is something added to http://wiki.pgmfi.org a while back that explains the letters:

Then the first letter:

"J" is PLCC package (square 32-pin package)
"P" is DIP (this is what you want, unless you're doing your own thing)
"T" is TSOP

The second letter - operating temp range code:

"C" means commercial and is rated for 0-70C (32F to 158F)
"I" means industrial and is rated for -40 to 85C (-40F to 185F) If you have a choice, get this one, because it can get very, hot inside your car in the summer.

Note: most OBD0 PR3 and PW0 ECUs I've seen are very picky about these chips, and frequently throw random solid CELs when using them - all speeds, including 90ns. I would advise using other chips in these ECUs.

Go to http://www.pgmfi.org/twiki/bin/view/Library/29C256 for the whole scoop on the 29c256 and other related chips...

raene

Get DIP 27c's.

We're successfully using a 29c256 120ns in my brother's PW0.

SOHCArchangel

where can you find the industrial chips, i dont see them on moats

crap i wish i knew this earlier, at least they aint too expensive

warwagon

29c256 from moates rewriteable yo

i think they actually are 27c256's but just rewriteable without a uv eraser

shawn_crx

Get the 29c256 Dip, They are reprogramable. So you don't have to buy and easier. If you screw up.
best thing is get a small group and buy it. And save some money.

Smashback

The 27 is an Eprom and the 29 is an EEprom. Eproms are UV, EEproms are like flash chips.

Don't worry about the letter in between, and yes, all manufacturers call them by slightly different names. Typically as long as it says 29 and 256 somewhere in there, you've got the right chip.

djnikko

cheers guys, think im sorted now.

tgreaves

Yup.. When I used a chipped pm6 I got my Atmel 29c256's from moates.net.. I think they were 120ns but not sure.. I remember reading somewhere on pgmfi.org that they had problems if the chip was below a certant speed..

raene

The access speed should be faster than 150ns.

djnikko

I have managed to get hold of a couple of 90ns ones, are these no good then?

dennis

90ns is faster than 150ns

tgreaves

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by djnikko &raquo;</TD></TR><TR><TD CLASS="quote">I have managed to get hold of a couple of 90ns ones, are these no good then?</TD></TR></TABLE>

There good.. Its the amount of time the chip takes to access "something" not sure what that is but.. The lower the number the faster the access time on the chip.. I used 120ns so your 90ns is faster then the ones that I used and mine worked great..

Joseph Davis

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">Yup.. When I used a chipped pm6 I got my Atmel 29c256's from moates.net.. I think they were 120ns but not sure.. I remember reading somewhere on pgmfi.org that they had problems if the chip was below a certant speed..</TD></TR></TABLE>

Both OBD0 and OBD1 factory chipped ECUs I've run across were 170ns. I've had CEL problems with 200ns memory, which is about as slow as it gets.

I've also had a few problems with some of the used 27C256 I've gotten off eBay lasting for the long haul... hate to say it, but buying 29C256, or 27SF256 if your burner supports them, is the way to go.

5STAR3

what is the best reasonably priced burner?

what burner are all of you guys running?

raene

There are tons of threads on this, I hate to say it... go to http://www.ecimulti.org/uberdata and sign up for the forum there for specific info. But to answer your question, I have a cheap Willem burner that works well.

tgreaves

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by envision2teg &raquo;</TD></TR><TR><TD CLASS="quote">what is the best reasonably priced burner?

what burner are all of you guys running?</TD></TR></TABLE>

I used a Willem burner.. I have one for sale if your looking..