2J74Y Monitor ROM

[amigokola]

Hi Guys.
I've read in Motorola 2J74Y datasheet that this mcu doesnt "use" monitor rom but when I see dumps read by ETL there is monitor rom present. Could someone here with ETL experience tell me: to do full copy of 2j74y monitor rom is necessary ? I have comfort module with 2J74Y foulty and did copy with X-prog ori and it doesnt work. When I heat original mcu all works fine. Rgs.

[junmab]

As far as i remember you can read all 3 memories (flash,eeprom,rom), but you write only the flash and eeprom.
Do you have a good source for the 2j74y ? I found some of them had defect with the eeprom.

[amigokola]

I have good source for 2j74y. I use them for Jaeger clusters with Carprog. But now I have to do full copy of mcu and I am courious if X-prog can do it as good as ETL ??
So what for is monitor rom in this mcu's when I cant copy this sector to new one ??

[3inferno3]

I have good source for 2j74y. I use them for Jaeger clusters with Carprog. But now I have to do full copy of mcu and I am courious if X-prog can do it as good as ETL ??
So what for is monitor rom in this mcu's when I cant copy this sector to new one ??

here you have my 2j74y solution...flash and eep. very good read.. pic with my sesion..

[amigokola]

Carprog cant read good whole flash from 2j74y. You have some custom made tool ??

[3inferno3]

You wrong.. flash and eep. do very vell... add 13.5v power and try in circuit or desolder like me on pic...and you will do this...

[amigokola]

Here is flash read with Carprog and Xprog and tell me that Carprog read it good...
Eeprom is the same.

[amigokola]

Somebody could explain to me what for is Monitor Rom in 2J74Y and can Xprog do full copy of this mcu like ETL ??

[RFRemotes]

You don't need to copy/clone monitor ROM. It is not used by the MCU in normal operating mode as in dash, ezs or whatever