2732A EPROM problem

[bcroe at juno.com]

The chip access time is not related to the programing
time.  The variation in programing time is likely related to
use of a smarter algorithm.  The old way is 50 ms at each
address, no matter what.  That adds up to nearly 4
minutes.  The "smart" way goes something like this.  Hit
the address with a 2 ms pulse, then check if it "took" all
bits.  Keep doing this till it does.  If it made it over the top
in 4 pulses (8 ms), give it 4 more to be sure it is pushed
down the other side of the hill.  You are now done in only
16 ms (instead of 50); move to next address

4 minutes is not so long; I prefer the old way.  2732As are
pretty reliable chips, if not damaged.  Bruce Roe 

On Sat, 24 Feb 2001 12:31:27 -0500 Carl Ijames <ijames at netaxs.com>
writes:
> Total guess here, but those are 200 nsec chips - maybe there's a 
> timing 
> problem somewhere?  How fast is the pc you are using (my 600 PIII 
> programs 
> the same eprom in about 1/3 the time my 8088 laptop does, with the 
> same 
> pocket programmer), are you running from dos or a dos prompt in 
> windows 
> (from dos is the best, safest way), or ??
> Regards,
> Carl Ijames     ijames at netaxs.com
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