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Hacking up Honda's ECU
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NICK
 Post subject: which chip to use
PostPosted: Thu Jul 18, 2002 1:41 pm 
Ok guys, I had a couple of Generic 26C256 EPROM, but they're all used now.
I'm about to go shopping and buy some zif sockets and xxPROM.

Now, which xxPROM should I buy ? Which onw do you reccomend.
Personally I'd like to use either EEPROM or FLASH, since EPROM are more fragile...
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blundar
 Post subject: Re: which chip to use
PostPosted: Thu Jul 18, 2002 1:48 pm 
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Senior Developer

Joined: Tue Jul 27, 2004 2:09 am
Posts: 4383
Location: Cincinnati, Ohio
I'm not sure if flash are electrically compatible.

I've personally used ATMEL 27C256 OTP ROMs, National Semiconductor 27C256 EPROMS w/ UV window.

EEPROMs will probably work too...

be really careful when buying ZIF sockets.
There is not a lot of space on the PCB for the extra space of a ZIF. The ones I use you can get from digikey for ~$6.50. They just BARELY fit and they are low profile ZIFs...

[%sig%]
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xtensive
 Post subject: Re: which chip to use
PostPosted: Thu Jul 18, 2002 1:59 pm 
I use the at29c256. The at28C256 doesn't work. Don't know about the 26c256 tho.

Mike
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fabrik8
 Post subject: Re: which chip to use
PostPosted: Tue Aug 06, 2002 12:14 am 
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Joined: Tue Jul 27, 2004 2:15 am
Posts: 250
That's cool that the 29C256 works, because they're cheaper than the 28C anyway, I'll have to try those... I agree about those Digikey ZIF sockets, those kick ass for the price and they actually fit in the footprint in Honda ECUs without touching anything...
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Brian Langston
 Post subject: Re: which chip to use
PostPosted: Wed Aug 07, 2002 12:27 am 
what speed do you guys use? I have been chipping alot of ecus lately and am out of 27c256s. I was gonna get a bunch more, but dont want some that are too slow or too fast. Does it matter? I can't afford to drop the $$ on 29s all the time. How much do you guys get them for? I really don't see paying more than .50 for 27s, and $5 for 29s.
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fabrik8
 Post subject: Re: which chip to use
PostPosted: Sun Aug 25, 2002 3:30 pm 
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Joined: Tue Jul 27, 2004 2:15 am
Posts: 250
120 ns or faster should work great..
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Mark Wolfe
 Post subject: Re: which chip to use
PostPosted: Mon Aug 26, 2002 2:53 am 
What's the digikey part number for the zif socket? I've had some low profiles laying around and put one to use the other night when a buddy brought over his pm6 and a chip. http://www.wolfenet.org/gallery/ecu you can see the socket here.
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Joseph Davis
 Post subject: Re: which chip to use
PostPosted: Mon Aug 26, 2002 11:54 am 
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PGMFI Elf

Joined: Tue Jul 27, 2004 2:10 am
Posts: 917
Location: ashEVILle, NC
The ZIF socket PN is A347-ND
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