Programming EPROM

Well, in C51 if you don't explicitly include it, the tools will automatically use the default version.
So, if the default version is appropriate for your target, you don't need to explicitly include it

However, on the 251, the startup code is almost always required because of the 2 configuration bytes.

If you don't include the startup code, you MUST set the configuration bytes manually with the device programmer or you must create them another way in the EPROM.

Jon

Well, in C51 if you don't explicitly include it, the tools will automatically use the default version.
So, if the default version is appropriate for your target, you don't need to explicitly include it

However, on the 251, the startup code is almost always required because of the 2 configuration bytes.

If you don't include the startup code, you MUST set the configuration bytes manually with the device programmer or you must create them another way in the EPROM.

Jon

I include the file in uvision but when I program the eprom with the hex file there is nothing at fff8 or fff9.

1. How would I go about setting
the configuration bytes manually?

How about the following assembly file...

cseg at 0FFF8
   DB 0F8h
   DB 0D2h
end

I finally got he config bytes in but my program still doesn't work.

I'm trying to get the blinky program that came with the software to work from an eprom.

I have the DIP switches set as:
uart-int-off
uart-ext-off
src/d2 -off
page -off
monitor -off
51/151 -off
Map1 -off
Map0 -off
A17 -off

I tried the configuration bytes you sent but it did not work.

Any help on this will be appreciated.