[sdiy] 27C512 not Eprom?

[John L Marshall]

Theo,

Most equipment that uses -48 volts is telco equipment. Most PTSOs (public
telephone switching office) are battery powered. Imagine a room with 24 lead
acid cells, each the size of a large aquarium. Not too useful elsewhere.

Cellular base stations are often battery powered as well but at +24 volts.

Take care,
John
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Pacific Northwest DIY Synthesizer meeting, July 20, 2002
See: www.sound-photo.com
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----- Original Message -----
From: "Theo" <t.hogers at home.nl>
To: "The Old Crow" <oldcrow at oldcrows.net>; <synth-diy at dropmix.xs4all.nl>
Sent: Friday, October 04, 2002 4:28 AM
Subject: Re: [sdiy] 27C512 not Eprom?


> So these are Eproms in a window less housing = OTP,
> guess it makes sense from a economic perspective.
> Well too bad :(
> I didn't pay for the junk box and there is some other useable stuff in it
:)
> Like assorted unused 74xxx IC and a almost full reels of 1uF and 100uF 50V
> elcos.
>
> I probably gona ask for some part number help again,
> cause there are also some strips with weird ICs and uC stuff.
> The uC are probably OTP too, but think its worth to check before I junk
> them.
>
> Mean while, anyone got a idea where -48V to 5V DC/DC converters are good
> for? (got a "view" of those too)
>
> Thanks to those who answered.
> Theo
>
>
> From: The Old Crow <oldcrow at oldcrows.net>
>
> > On Fri, 4 Oct 2002, Theo wrote:
> >
> > > However under the metalized stickers are no windows to erase the ICs.
> > > If not Eprom then what are these; Eeprom, OTProm? or ???
> > > The full text on the ICs is:
> > >
> > > AM27C512 -200PI
> >
> >   Yep, a one-time programmable ROM.  It would be erasable if you drilled
a
> > window to expose the chip. ;)
> >
> > Crow
> > /**/
> >
>