Altos ACS 8000-15A

[Ian McLaughlin]

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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