30 Sep
2001
30 Sep
'01
11:17 a.m.
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(a)earthlink.net
30 Sep
30 Sep
12:21 p.m.
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(a)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(a)earthlink.net
2:11 p.m.
"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(a)idcomm.com>
To: <classiccmp(a)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(a)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(a)earthlink.net
3:10 p.m.
My 1978 Intel Component Data Catalog has a 8080A / 8080A-1 / 8080A-2 data
sheet copyright 1977 (page 11-11 to 11-18). Just under the title is the
following line.
"The 8080A is functionally and electrically compatible with the Intel 8080."
I will look around for older catalogs. I have more Motorola 6800 datasheets
than Intel. This could be like the difference between the MC6820 and MC6821
Peripheral Interface Adapter. That was some small electrical specification
on an I/O pin that I can't remember now.
-----------------------------------------------
Michael Holley
holley(a)hyperlynx.com
-----------------------------------------------
----- Original Message -----
From: "John Galt" <gmphillips(a)earthlink.net>
To: <classiccmp(a)classiccmp.org>
Sent: Sunday, September 30, 2001 12:11 PM
Subject: Re: 8080 vs. 8080A
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?
5:29 p.m.
Intel did not refer to clock frequency but to Instruction Cycle to indicate
the speed of the chip. From Intel Component Data Catalog 1978 page 11-11
8080A 2 us
8080A-1 1.3 us
8080A-2 1.5 us
My SDK-80 Users Guide has schematics dated July 1975 and show an 8080A.
-----------------------------------------------
Michael Holley
holley(a)hyperlynx.com
-----------------------------------------------
12:26 p.m.
Hadn't heard anything of an 8088/86 series bug but I know there's a 32 bit
applications lockup problem in some 386DX-16's and the well known floating
point math problem in the original Pentium series.
-----Original Message-----
From: owner-classiccmp(a)classiccmp.org
[mailto:owner-classiccmp@classiccmp.org]On Behalf Of John Galt
Sent: Sunday, September 30, 2001 11:18 AM
To: classiccmp(a)classiccmp.org
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(a)earthlink.net
12:49 p.m.
Just WHAT do 8088/8086 features and creatures have to do with the i8080?
Note that OE strips the RICH TEXT/HTML features from the outgoing email with a
simple mouse-click (under FORMAT). Since HTML is anathema to some of the list's
readers, PLEASE turn it OFF. If you didn't have it enabled, it wouldn't leak
through your transmissions.
Dick
+++++++++++++++++++++++++++++++++++++++++++++++
----- Original Message -----
From: Russ Blakeman
To: classiccmp(a)classiccmp.org
Sent: Sunday, September 30, 2001 11:26 AM
Subject: RE: 8080 vs. 8080A
Hadn't heard anything of an 8088/86 series bug but I know there's a 32 bit
applications lockup problem in some 386DX-16's and the well known floating point
math problem in the original Pentium series.
-----Original Message-----
From: owner-classiccmp(a)classiccmp.org [mailto:owner-classiccmp@classiccmp.org]On
Behalf Of John Galt
Sent: Sunday, September 30, 2001 11:18 AM
To: classiccmp(a)classiccmp.org
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(a)earthlink.net
5:40 p.m.
As Gilda Radner used to say on SNL - "nevermind"
I read the numbers wrong after a day of reworking 8086 series 5150/5160
machines.
-> -----Original Message-----
-> From: owner-classiccmp(a)classiccmp.org
-> [mailto:owner-classiccmp@classiccmp.org]On Behalf Of Richard Erlacher
-> Sent: Sunday, September 30, 2001 12:49 PM
-> To: classiccmp(a)classiccmp.org
-> Subject: Re: 8080 vs. 8080A
->
->
-> Just WHAT do 8088/8086 features and creatures have to do with the i8080?
->
-> Note that OE strips the RICH TEXT/HTML features from the
-> outgoing email with a
-> simple mouse-click (under FORMAT). Since HTML is anathema to
-> some of the list's
-> readers, PLEASE turn it OFF. If you didn't have it enabled, it
-> wouldn't leak
-> through your transmissions.
->
-> Dick
-> +++++++++++++++++++++++++++++++++++++++++++++++
-> ----- Original Message -----
-> From: Russ Blakeman
-> To: classiccmp(a)classiccmp.org
-> Sent: Sunday, September 30, 2001 11:26 AM
-> Subject: RE: 8080 vs. 8080A
->
->
-> Hadn't heard anything of an 8088/86 series bug but I know
-> there's a 32 bit
-> applications lockup problem in some 386DX-16's and the well
-> known floating point
-> math problem in the original Pentium series.
-> -----Original Message-----
-> From: owner-classiccmp(a)classiccmp.org
-> [mailto:owner-classiccmp@classiccmp.org]On
-> Behalf Of John Galt
-> Sent: Sunday, September 30, 2001 11:18 AM
-> To: classiccmp(a)classiccmp.org
-> 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(a)earthlink.net
->
->
6:26 p.m.
New subject: WTD: 8" FDC for Apple
I've been pondering how to read and subsequently publish the sources for the
APEX-based 6502 software I have on 8" APEX-formatted diskettes (SSSD, but unique
organization) with an eye to getting the task off my list. I've decided that
the easiest way to do this is to snag an SVA (Sorrento Valley Associates ?) 8"
drive controller for the Apple][. Does any of you guys have one or more of
these that I could beg, borrow, steal, even <cringe> buy or rent? I just need
it for this one task, and then, having forever had my fill of Apple, I'm never,
Never, NEVER, going to fiddle with an Apple product again if I can avoid it. My
Apples are subsequently going into the rubbish heap, where they've always
belonged, methinks, as fragile as their disk subsystems are, and I will try to
forget all about them.
However, the Apple does provide a straightforward vehicle for making these files
available to those who <cringe> want to fiddle with or examine them.
Any offers or suggestions will be considered.
thanx,
Dick
8492
days inactive
8492
days old
8 comments
4 participants
participants (4)
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edick＠idcomm.com -
gmphillips＠earthlink.net -
rhblakeman＠kih.net -
swtpc6800＠home.com