Programming 2708's

[Pete Turnbull]

On Jun 26 2005,  0:49, lee davison wrote:
>
> >>  What programmer can I look for that has the ability to program a
> >> 2708?
>
> I have a Softy 2 that can do it if you're really stuck.
>
> > Not just that, the programming algorithm is different to most
> > other EPROMs. IIRC you have to program all locations in sequence,
> > giving each one a 1ms (IIRC) programming pulse, and repeat that
> > 50 times.
>
> Any bit in any byte can be individually programmed from 1 to 0.
> There are no sequence requirements, the programming pulse is one
> pulse of 50ms per location programmed.

Not on any of mine.  Some later EPROM types can be programed either
way, but not original 2708s.

> > You can't program odd locations like you can in later EPROMs.
>
> You can, it's EPROM microcontrollers like the 68705 that need to
> be programmed in sequence.

Sure you're not looking at the specs for a 2716?  Tony's information is
correct for a 3-rail 2708 according to my Intel, Motorola, Texas data
books.



-- 
Pete						Peter Turnbull
						Network Manager
						University of York