16 Dec
2002
16 Dec
'02
9:42 a.m.
At 08:26 PM 12/14/02 -0800, you wrote:
I was trying to get some information on this old B1702A
chip. I know
it is a 256x8 chip but someone told me that "B" marked chips are
normally gray with tin leads.
I was wondering about the "B" markings. I was sorting a bunch of surplus
chips a few days ago including a big pile of 2716s and I found one marked "B
2716". (The complete markings are "i B2716 023D3-V (c) INTEL '77") It
has a large square window of frosted material and the window is rasied above the IC
surface. All the D 2716s have smaller round clear windows that are flush with the IC
surface. The B part and most of the D parts all have tinned leads and gray bodies.
This one is white ceramic with gold leads. I tried finding something
on this but have not found this particular marking and colors.
Anyone know the skinny?
http://www.msdsite.com/temp/1702a2.jpg
I looked at this picture and saw the "1602" die marking. The Intel 1602 was
a PROM and not an EPROM and other than being non-eraseable was completely compatible with
the 1702. I suppose they used the same die but in different packaging. I'm guessing
that your 1702 is an early one. I just sold a 1602 to a collector, I think it was the only
one that I had ever seen.
I have 3 variations of these. The ones above, ones that are clearly
marked C1702A (intel) and one marked C8702A (intel). I suspect even
the unmarked one is inte.
I'm sure it is. I have one built exactly like it but mine is marked "i C1702A
F5800" above the window and "S314" near the bottom of IC. I found this one
in a box of Intel samples. It's still in it's original plastic bubble. I don't
have a microscope so I don't know if the die is marked or not.
Joe