Need help selecting the correct 27c256 eprom
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Junior Member
Joined: May 2001
Posts: 11
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From: chicago,il, usa
Need help selecting the correct 27c256 eprom
I cant find any eproms locally so im going to order some off the internet.
http://www.mouser.com./products/psea...TOKEN=85912044
has lots of 27c256 eproms. I do know that I need a 28 pin 12.5volt eprom, but aside from that which one should I pick???
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1985 355 S/R V8
http://www.mouser.com./products/psea...TOKEN=85912044
has lots of 27c256 eproms. I do know that I need a 28 pin 12.5volt eprom, but aside from that which one should I pick???
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1985 355 S/R V8
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From: Savannah, GA
Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
This one, it's the fastest at 90ns and the cheapest also.
http://www.mouser.com./products/deta...&source=search
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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Raptor 700R4 Tranmission, Trick Flow Twisted Wedge G2's, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Hooker Cat-back, Serpentine Belt Setup, Dual IROC Fans, Jamex springs, 16" IROC Rims, 36mm/24mm Sway Bars, Global West Steering Brace. Hotchkis Rear LCA's,Panhard Bar and SFC's.
My Camaro Project
http://www.mouser.com./products/deta...&source=search
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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Raptor 700R4 Tranmission, Trick Flow Twisted Wedge G2's, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Hooker Cat-back, Serpentine Belt Setup, Dual IROC Fans, Jamex springs, 16" IROC Rims, 36mm/24mm Sway Bars, Global West Steering Brace. Hotchkis Rear LCA's,Panhard Bar and SFC's.
My Camaro Project
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iTrader: (1)
Joined: Feb 2000
Posts: 2,361
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From: Savannah, GA
Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
<font face="Verdana, Arial" size="2">Originally posted by tntcorvette:
I do know that I need a 28 pin 12.5volt eprom, but aside from that which one should I pick???
</font>
I do know that I need a 28 pin 12.5volt eprom, but aside from that which one should I pick???
</font>
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Uhm... they're 5 volts? How come when I program one with Pocket Programmer it says 12.5 volts ?
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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
Member
Joined: Jul 1999
Posts: 184
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From: Bartlett, IL
Car: 1990 Corvette ZR-1
Engine: LT5
Transmission: ZF6
TNT,
I have some extras if you need them
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-=Jeff=-
89 Corvette Coupe White with Black Grand Sport Stripe
-=ICON Motorsports=-
Check out my mods on My '89 Vette
I have some extras if you need them
------------------
-=Jeff=-
89 Corvette Coupe White with Black Grand Sport Stripe
-=ICON Motorsports=-
Check out my mods on My '89 Vette
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TGO Supporter
Joined: Jul 1999
Posts: 10,907
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From: The Bone Yard
Car: Death Mobile
Engine: 666 c.i.
Why waste your time with a 27C356 eprom when for virtually the same price, you can buy an AT29C256 Flash Prom?
A Flash Prom does not need a UV Eraser, as it is erased electroncally. The erasing time is only seconds compared with 15 minutes (to start) and slowly gets longer and longer (with a regular eprom). AND, a Flash Prom has a virtual indefinite life while you are lucky to get 25-50 times with a regular eprom prom.
I say "virtually indefinite" as a Flash Prom does have a limitation on how many times you can erase/re-program...but it MANY MORE times than a regular eprom. I have re-programmed my current Flash Prom over 130 times and it still works fine and dandy. When I "hit the limit", I will tell you what it is.
A Flash Prom does not need a UV Eraser, as it is erased electroncally. The erasing time is only seconds compared with 15 minutes (to start) and slowly gets longer and longer (with a regular eprom). AND, a Flash Prom has a virtual indefinite life while you are lucky to get 25-50 times with a regular eprom prom.
I say "virtually indefinite" as a Flash Prom does have a limitation on how many times you can erase/re-program...but it MANY MORE times than a regular eprom. I have re-programmed my current Flash Prom over 130 times and it still works fine and dandy. When I "hit the limit", I will tell you what it is.
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