PDA

View Full Version : HOW to DUal eprom?



ominimicu
20th March, 2014, 04:08 PM
I need to do a dual eprom of a OLD BMW. but engine is acting strange.
i used this guide
Dual Switchable Chips - BMW 3 Series (http://bmw3series.johnavis.com/blog/default.asp?id=666)

anyone knows how to do dual peroms?

dean 21
20th March, 2014, 07:28 PM
Hi, which chip you use? is on the ecu?

gezame
21st March, 2014, 02:20 AM
Hi
You need unit two files 32kb-27c256, esemple file ori+file mod, in one single file 64kb-27c512.
Write in one 27c512 and swich the pin 1 of the eprom to +5v or gnd, to acces the two memory adresses.
Br.

dean 21
21st March, 2014, 10:50 AM
Hi, yes you must bend up the pin A15=1st pin, of 27c512 , then bend up pin connect trought switch to pin 1 on the board. When the switch is on, will use second map of the eprom, Must to program two maps on the 512 eprom, ori and mod, if the second is mod, switch on, mod on. switch off ori on. ;)

ominimicu
21st March, 2014, 01:42 PM
i only had 27C256 eproms. In the 512, the 2 files in hex are imediately one after the other?

dean 21
21st March, 2014, 02:30 PM
Yes, one after the other.