2 Eproms

[Peter Rueb]

Does anybody know if there exists a newer efi that uses 2 eight bit eproms
parallel in one ECU?
If so, are the adress lines completely seperated or are they used together
for the two eproms.
I heard that some new efi use the 80166 with a 16bit eprom as well.
I am planning a eprom simulator that can handle eproms up to 128kB/8bit and
allows online memory editing while simulating in a efi. I want to know if i
should include the option to control two eproms in even/odd mode and the 16
bit option.
One more question to that: The memory editing while in simulation mode
should work like this:
	- Wait until there is no valid adress signal from the ECU.
	- Seperate the lines from socket to ram and switch on a buffer to store a
adress that may come 	up.
	- Write the other stored value to ram.
	- Re connect the lines again that the data can flow to where it is needed.
	This is all done by hardware and i am calculating with each ns delay of
the used ICs.
How much time do i have to seperate the lines until an error occurs in the
ECU?
Is this timeout error hardware or software sensitive?
Let4s say i use the digifant 2 with hc11 and internal clock of 2Mhz. I have
not gone into mc details that much and i try to build this little tool
independant from any special mc.
Thanks,
Peter
s68558 at stud-mail.uni-wuerzburg.de