[Diy_efi] What type masked ROMS on early motronic ecu's

[bcroe at juno.com]

It would seem you could watch how the 1802 reads them. 
A mask rom just has different control signals in read mode. 
Emulate that, or worst case capture the input address and 
data out on the fly as the 1802 runs.  Might be hard to get 
everything out that way.

Bruce Roe

13 Jun 03 "Mike  Rosendale" <inexpensivepartsman at roadfly.org> writes:
> These roms are from early BMW with cdp1802 processor.  
> The installed roms are not eproms but masked roms with 
> chip select pinouts and will not read as an eprom would.  
> Excluding the chip select pins, the remainder are the same 
> as a 2716.  I made a circuit to switch combinations of 5v 
> and ground to the chip select pins thinking that might make 
> them readable.  But no luck.   So how does one read 
> a cdp1834 masked rom on a standard eprom reader?

> IPM

_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi