eprom 27c256 High/low 128k segment selection?

[badbiki]

I'm trying to use a 27c256 eprom instead of a 27c128 in my ca18det ecu. I've heard this is possible by hooking up a switch that pulls a pin Hi/Lo to select the upper or lower area of the eprom's memory.

a performance and economical ecu map. top 128k, bottom 128k. in a nut shell.

how can i rig this up? using a standard 28pin 27c256 eprom?

 

[micro_tools]

1) Eprom addres line A14 connect via pull up resistor to Vcc
2) Eprom addres line A14 connect via switch to GND

 

[Crisbe]

Yes, very right. U can also use a port-pin of your uC. This is called code-banking with no common page. Many linker support this. So u can program in double space.
There are even more possibilities for code-banking. But these are more complicated to tell your linker. Look at this **broken link removed** for some basic information.


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I don't like it, it's too easy!

<font size=-1>[ This Message was edited by: Crisbe on 2002-05-06 14:17 ]</font>

 

[badbiki]

ahh thanks heaps. trying to make my eprom programer atm, using the batronix one.

having a few probs...