8080 vs. 8080A

From: ajp166 <ajp166_at_bellatlantic.net>
Date: Sun Sep 30 18:16:03 2001

Nope, the clock you see was divided by 2.

the board had two clocks one provided the 2mhz 2phase
12V clock for the 8080 the other was for other clocked parts.

Allison

-----Original Message-----
From: Richard Erlacher <edick_at_idcomm.com>
To: classiccmp_at_classiccmp.org <classiccmp_at_classiccmp.org>
Date: Sunday, September 30, 2001 6:15 PM
Subject: Re: 8080 vs. 8080A


>The half-dozen or so I8020/4 boards I have all have i8080A CPU's in
them, and
>each is clocked at 4.(something very small) MHz, IIRC. Are you saying
that
>Intel ran these >1 MHz above spec? I've also seen numerous applications
in
>which they were driven at the color burst frequency from some harmonic
of that.
>
>Dick
>
>----- Original Message -----
>From: "ajp166" <ajp166_at_bellatlantic.net>
>To: <classiccmp_at_classiccmp.org>
>Sent: Sunday, September 30, 2001 2:31 PM
>Subject: Re: 8080 vs. 8080A
>
>
>> Wrong!
>>
>> The I8080A is AS fast as the i8080. the i8080A-1 is faster but not
twice
>> as the fastest 8080[A] was only 3mhz and hte standard part was 2mhz.
>>
>> Allison
>>
>> -----Original Message-----
>> From: John Galt <gmphillips_at_earthlink.net>
>> To: classiccmp_at_classiccmp.org <classiccmp_at_classiccmp.org>
>> Date: Sunday, September 30, 2001 3:57 PM
>> Subject: Re: 8080 vs. 8080A
>>
>>
>> >"The i8080A is essentially twice as fast as the
>> > standard i8080 and COULD be used more easily with low-power logic
since
>> its
>> >demands aren't as stringent".
>> >
>> >Ok, that's a good start.
>> >
>> >But, I don't think "low power" TTL (transistor transistor logic) had
>> >anything to do with the complexity of the code being executed on the
>> chip.
>> >True? I had assumed
>> >that the references to the 8080 only being compatible
>> >with "low-power TTL" and the 8080A being compatible
>> >with "standard TTL" had something to do with the support chips (Ram,
>> clock,
>> >etc) that could be used with the 8080 vs. the 8080A.
>> >
>> >Since I'm new to this mail list, let me explain why I would
>> >show up here and ask such a question to begin with.
>> >
>> >I'm a chip collector. I am trying to document the differences
between
>> the
>> >different early Intel microprocessors. Not worried about massive
>> detail,
>> >just the major differences (PMOS, vs. NMOS, vs.
>> >HMOS, clock speed, transistor count, etc).
>> >
>> >The only microprocessor that I don't have a good handle
>> >on is the 8080 and the difference between the 8080 and 8080A.
>> >
>> >I also know that the 8080 was introduced sometime
>> >around April 1974. I have not been able to find an
>> >introduction date for the 8080A. Was it introduced at
>> >the same time? Does anyone know?
>> >
>> >I also need an Intel C8080 or C8080-8 for my
>> >collection. If you have one, I want it. I have been looking
>> >for one for months and have not been able to find one.
>> >If you have either of these chips in good condition
>> >(no desoldered parts wanted), I'm offering 400.00
>> >for the C8080-8 and 500.00 for a C8080.
>> >
>> >If you need a replacement for the C8080 or C8080-8 you sell me, I'll
>> GIVE
>> >you a D8080A free as part of the
>> >deal.
>> >
>> >----- Original Message -----
>> >From: "Richard Erlacher" <edick_at_idcomm.com>
>> >To: <classiccmp_at_classiccmp.org>
>> >Sent: Sunday, September 30, 2001 1:21 PM
>> >Subject: Re: 8080 vs. 8080A
>> >
>> >
>> >> This makes no sense at all, though it may be because I'm
>> misinterpreting
>> >the way
>> >> in which you've put it.
>> >>
>> >> I have Intel boards that come in versions with the i8080 and also,
>> >> optionally,with the i8080A, and, aside from the clock frequency and
>> memory
>> >> access times, they're identical. The i8080A is essentially twice
as
>> fast
>> >as the
>> >> standard i8080 and COULD be used more easily with low-power logic
>> since
>> >its
>> >> demands aren't as stringent.
>> >>
>> >> The i8080A will, AFAIK, replace the i8080 in all applications
without
>> ill
>> >> effects.
>> >>
>> >> BTW, please turn off "rich-text" mode in your email editor when you
>> >compose
>> >> messages for this group, as some folks' mail readers can't
interpret
>> the
>> >> rich-text/HTML format.
>> >>
>> >> Dick
>> >> ++++++++++++++++++++++++++++++++++++++
>> >> ----- Original Message -----
>> >> From: John Galt
>> >> To: classiccmp_at_classiccmp.org
>> >> Sent: Sunday, September 30, 2001 10:17 AM
>> >> Subject: 8080 vs. 8080A
>> >>
>> >>
>> >> Can anyone here describe the technical differences between
>> >> an Intel 8080 and Intel 8080A CPU?
>> >>
>> >> The ONLY ref. I have been able to find seems to indicate that there
>> was a
>> >bug in
>> >> the 8080 and as a result it would only work with low power TTL?
>> >>
>> >> The problem was fixed in the 8080A and it would work with standard
>> TTL?
>> >>
>> >> Does this make sense to anyone?
>> >>
>> >> Could anyone put this into laymans terms for me?
>> >>
>> >> Thanks,
>> >>
>> >> George Phillips - gmphillips_at_earthlink.net
>> >>
>> >
>>
>>
>
Received on Sun Sep 30 2001 - 18:16:03 BST