30 Sep
2001
30 Sep
'01
12:31 p.m.
On Sep 30, 15:43, Richard Erlacher wrote:
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.
Sure you're not thinking of a Z80? The standard speed for the original Z80
parts was 2.5MHz (4MHz for Z80A and 6MHz for Z80H).
--
Pete Peter Turnbull
Network Manager
University of York
30 Sep
30 Sep
1:01 p.m.
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4:55 p.m.
Nope ... but I'm not sure whose version I'm remembering. Back when I used 8080
types I used whatever came in the boards I bought, since I would never have
willingly designed with a part that required three supply voltages. With EPROMs
you had little choice, but the CPU was too much.
Most of the applications I've looked at didn't use the Intel clock generator and
other support parts because they cost too much. I don't have any multibus cards
for the Z80, and I've NEVER willingly used a Z80 at less than 4 MHz. It's just
too slow, which also explains my preference for MOT and MOS-Technology parts.
The Z80H is spec'd ( I have the sheet right here in my hand) for 8 MHz. The 6
MHz part is the Z80B, just to keep things straight.
I'm sure the part in question is an 8080-type, but I don't have the board in
front of me at the moment, so I don't know for certain whose part it is.
The AMD version is definitely faster than Intel's, however. I looked that one
up earlier.
I'm not at all sure about National and TI versions, as I'm in the middle of
putting up some shelves, and materials are lying on top of where the old
databooks are.
Dick
----- Original Message -----
From: "Pete Turnbull" <pete(a)dunnington.u-net.com>
To: <classiccmp(a)classiccmp.org>
Sent: Sunday, September 30, 2001 6:31 PM
Subject: Re: 8080 vs. 8080A
On Sep 30, 15:43, Richard Erlacher wrote:
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.
Sure you're not thinking of a Z80? The standard speed for the original Z80
parts was 2.5MHz (4MHz for Z80A and 6MHz for Z80H).
--
Pete Peter Turnbull
Network Manager
University of York
8484
days inactive
8484
days old
2 comments
3 participants
participants (3)
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ard＠p850ug1.demon.co.uk -
edick＠idcomm.com -
pete＠dunnington.u-net.com