8080 vs. 8080A

From: ajp166 <ajp166_at_bellatlantic.net>
Date: Sun Sep 30 18:12:07 2001

no, it was 2mhz.

using 8224 the usual crystal was 18.435 (2.0483333*9).
there was a -1. -2 and -3 version of the part but the fastest was 3mhz.

I used to sell upD8080AF for NEC and I had to know my competition.

Allison

-----Original Message-----
From: Richard Erlacher <edick_at_idcomm.com>
To: classiccmp_at_classiccmp.org <classiccmp_at_classiccmp.org>
Date: Sunday, September 30, 2001 6:23 PM
Subject: Re: 8080 vs. 8080A


>BTW, the 8080 was a 2.5 MHz part, wasn't it? I've got a couple Intel
app-notes
>where they generate a baud-rate clock from 24.576 MHz and generate the
CPU clock
>from that, at 2.4576 MHz for the CPU. That's on an i8080-2.
>
>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 - 18:12:07 BST