whats the difference between eprom and non eprom ecu ?

[93laser1g]

whats the difference between an eprom and non eprom ecu? i have a 93 laser awd auto. i need a new ecu but i have no idea what is best the car is fully stock. so whats the difference in the eprom non eprom? and does the federal ecu and the california ecu make a difference and would it effect my car if i install the wrong ecu? please any help would be appreciated. oh and does anybody have a ecu for it? its a 93 laser awd automatic

 

[RadDsm]

From VFAQ

What is an EPROM?
What is an EPROM ECU?
An EPROM is an electrically programmable read-only memory, or a type of computer memory that can be programmed only once, but read an unlimited number of times. EPROM ECUs have such a memory IC installed in them. This memory holds the program code that controls the ECU behavior. The EPROM is a separate chip from the microcontroller (computer chip) that actually runs the program. This makes it easy to change the ECU programming, since only the EPROM need be replaced, and EPROMs and their associated programming tools are relatively common.

The alternative, a non-EPROM ECU, does not have an EPROM. Instead, the program is stored inside the microcontroller itself (technically, in embedded EPROM memory that is part of the microcontroller). This makes it hard to change the ECU programming, because the microcontroller needs to be replaced. These are difficult to get, and require special programming tools that are equally difficult to find.

You won't need an EPROM ECU if you don't plan on doing any tuning. If you have a California car, get a California ECU.

 

[dsm03]

EPROM Modification FAQs