<br><br><div><span class="gmail_quote">On 12/9/06, <b class="gmail_sendername">Stefan Schmidt</b> <<a href="mailto:stefan@datenfreihafen.org">stefan@datenfreihafen.org</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>With ROM you refer to chips that can be written only once? I doubt<br>that many of such chips are still alive.<br><br></blockquote></div>PROM's are used typically where you are producing an end product where you don't need to update. They're MUCH cheaper than an EPROM, and when you're turning out millions of a cheap mickey-d's video game toy, being able to erase the chip doesn't matter
<br><br>Likewise, they're used when extreme ruggedness is needed, since you actually burn part of the silicone during writing, it is more secure from tampering, and less susceptible to damage than a more complex (E)EPROM, EPROMs are susceptible to UV radiation, and EEPROMs to electrical voltages. Since once a fuse cannot be changed once it is blown, it is much more difficult to tamper with the circuit.
<br><br>However, in this case, we're talking about memory that we don't have access to, this could be an (E)EPROM or even flash that we just can't send an erasure signal to.<br><br>anyways, just thought I'd let you know<br>
<br clear="all"><br>-- <br>--Jeff<br>What DO you call whitewater when you live in the desert?