15 Jun
2015
15 Jun
'15
2:36 p.m.
The NatSemi MM2716Q is definitely the ?normal? single rail EPROM. The TMS2716 is the TI
version that is 3-rail. A quick test would be to measure pin 19 in circuit. If this is
12v, then it?s expecting a TI part.
Does your reader have any other ?brands? of 2716 you could try? What about trying to read
it as a 2732? Looking at the pinouts it looks like the only difference is pin 21 which is
Vpp (programming voltage) on a 2716 and A11 on a 2732. You?ll get a 4k buffer but
hopefully half of it will have your data?
Ian
On Jun 15, 2015, at 2:19 PM, Chris Osborn <fozztexx
at fozztexx.com> wrote:
On Jun 15, 2015, at 1:56 PM, Ian McLaughlin <ian at platinum.net> wrote:
All zeroes is really strange - a blank EPROM is
all ones, so it?s not that it got exposed to UV light.
It definitely does seem strange. I wonder if maybe it?s a TI style 2716? It?s a National
Semiconductor MM2716Q.
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