Oversized EPROM's & Multiple Programs

[bcroe at juno.com]

Switching when powered up is risky business.  If
there is executable code in the EPROM, the processor
could lose sanity completely.  If it only contains tables,
you will probably get away with it.  

One way to do it might have the program select switch
bits go into a register.  This register could be clocked 
continuously for 2 simultaneous conditions.

 1.  New memory address setup start time

 2. The address is in a segment of the program which
      is not executed out of the EPROM, but is used often.

Bruce Roe

> ----- Original Message -----
> 
> To those who are using, or have used, oversized EPROM's that contain 
> more than one program
> image........
> 
> Can you simply select between say Program "A" and Program "B" while 
> on the fly, or do you have to
> power/idle down and then switch from one to the other? 

> Walt.
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