I think that's been pretty well established, Pete.
I'll look for the reference only to clear up my own confusion. I've only
owned ONE 8708 and doubt I ever had a 2758 on hand. The 5-volt 2716 was so
easy to program I adopted it immediately and never looked back. My first 2716
programmer was on a 6502 with a 50 ms one-shot on the RDY line, triggered by
the SYNC signal, which locked the processor and the data latched on the
programmer, until the requisite time had passed. It was dirt-simple. Also, a
74133 would decode the 2716 into the top 2K without further ado. It was
delightful!
Dick
----- Original Message -----
From: "Pete Turnbull" <pete_at_dunnington.u-net.com>
To: <classiccmp_at_classiccmp.org>
Sent: Monday, May 06, 2002 3:30 PM
Subject: Re: 2708 Programming Algorithm?
> On May 6, 14:20, Richard Erlacher wrote:
> > Now I'm really confused, Joe. Thanks for stirring the coals, though.
> >
> > I can't find any Intel memory data before '82, and by that time they were
> on
> > 5-volt-only EPROMs all the way. The brocheure I'm thinking of, with
> respect
> > to that 8748 evaluation board, has the "it's a 5-volt world" slogan that
> Intel
> > liked to use in promoting the 2716 back then, but I'll find the '78 8748
> book
> > eventually, since I just looked at it yesterday.
>
> > > >I do believe you've misread part of the spec's, Joe. The 8708, IIRC,
> is a
> > > >5-volt-only version of the 2708, otherwise masqueraded as the 2758.
>
> I hate to disappoint you, Dick, but my Intel 1979 Data Book lists the 2708
> and 8708 on the same page, with the note "All 8708 specifications are
> identical to the 2708 specifications", and then proceeds to describes all
> he characteristics of a standard 3-rail EPROM. The 1976 book i referred to
> earlier does list them in separate sections, but I don't see any
> significant difference in characteristics, not even in input voltage range.
>
> I think you're confusing it with the 2758, which the same catalog shows
> right after the 2716, identical in all respects except that the 2758 has
> A(R) on pin 19 instead of A10. A(R) has to be low for all device access,
> even "standby" mode, except in the case of -S1865, when it has to be high.
>
> It would appear that the 2758 is in fact a one-half-working 2716.
>
>
> --
> Pete Peter Turnbull
> Network Manager
> University of York
>
>
Received on Mon May 06 2002 - 16:46:33 BST