EPROM Eraser not erasing New EPROM

[mike mager]

"93 Formula" said about erasing his UVEPROM:

>Keep those ideas coming - someone's bound to win the grand prize give away! 
>:-)

Al-a-righty, then!

Can you _prove_ that you are really reading the memory?  A typical 'memory 
check' algorythm would do it (and you can do it 'by hand');  an ultra-simple 
first stage would be:

Program(!) each location:

00000000 with 00000000 (00)
00000001 with 00000001 (01)
.
.
.
11111111 with 11111111 (FF)

. . . and so on;  you can enter the data by hand (yick!), or write a trivial 
program to create it.  There are more stages, inverse patterns, combination 
patterns, and stuff, but can you really read it/write it at all?

I want to know!
Do you have a data line open/grounded/tracking another, and the same for 
address lines?  This simple type of test is a 'first stage' in determining 
the answers to these questions.

BTW, it is merely high school level technology to remove (I dare to say!) 
_any_ IC - SMT or through-hole;  a socket may usually then be 
installed/adapted.

As they say, "this ain't rocket science"!

I had a PIC MCU that was reluctant to erase once, but that was after I had 
already exceeded its erase 'life';  an extra-long session on the Datarase 
did erase it, in the end, and the PIC verified and worked just fine.

As far as 'destroying' a UVEPROM cell, if it clears, and if it verifies, 
then it is good (this is not NASA).

'They' say that a foil label is the only sure way to 'protect' a programmed 
memory (not a 360KB floppy write-protect paper label!).

My friend/roommate Sean works for OSC (Orbital Sciences Corporation) - the 
only private company to _successfully_ orbit a payload - and he _does_ need 
to deal with rocket science and NASA! (laugh now)

Good results, Jeff,
Mike (what a mess I've made!)
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org