Z80 clock speed
Pedro Bastos Fonseca
Can any one tell me what is the maximum clock speed a Z80 processor
will work with ? If there are different Z80 micro processorrs, what are
their names and what speed will they accept ? Is it possible to have a Z80
running at 8.192 Mhz ? 6.144 Mhz ? 4.096 Mhz ?
Thanx in advance.
Pedro
Aleksandr A. Babaylov
:> Can any one tell me what is the maximum clock speed a Z80 processor
:>will work with ? If there are different Z80 micro processorrs, what are
:>their names and what speed will they accept ? Is it possible to have a Z80
:>running at 8.192 Mhz ? 6.144 Mhz ? 4.096 Mhz ?
--
ZZZZ X X
Z X X
Z X bab...@kiae.su == bab...@relcom.net
Z X X Alexandr Babaylov
ZZZZ X X
login...@hookup.net
> Hi!
> Can any one tell me what is the maximum clock speed a Z80 processor
>will work with ? If there are different Z80 micro processorrs, what are
>their names and what speed will they accept ? Is it possible to have a Z80
>running at 8.192 Mhz ? 6.144 Mhz ? 4.096 Mhz ?
> Thanx in advance.
> Pedro
My knowledge of Z80 is a little bit rusty, but let's see:
- The original Z80 ran at up to 2.5 MHz
- Z80A at up to 4.0 MHz
-Z80B at up to 6.0 MHZ
But it was in old good times. There were many more different versions of Z80
released in the last ten years by different manufacturers and I hear the
fastest Z80 can run at 20 MHz. Don't know details though, maybe someone else
can help.
There are also backward compatible versions of Z80 such as Z180 and
Z280, different pinout though.
Michael
*************************************************************************
Michael Inglot min...@hookup.net
*************************************************************************
Marko Kacic
: Can any one tell me what is the maximum clock speed a Z80 processor
: will work with ? If there are different Z80 micro processorrs, what are
: their names and what speed will they accept ? Is it possible to have a Z80
: running at 8.192 Mhz ? 6.144 Mhz ? 4.096 Mhz ?
: Thanx in advance.
: Pedro
Yes, there is different Z80 processors. There are : Z80 at 3.5 Mhz, Z80A
at 4.0 Mhz, Z80B at 6.0 Mhz and some others. I'm not sure about speed but
for those types I'm sure. I think that exists and Z80C or something at 8.0
Mhz, I'm not sure.
Marko from Croatia.
--
*****************************************************************
* *
* MARKO KACIC *
* *
* E-mail : marko...@fer.hr *
* *
* ZX Spectrum is alive !!! *
*****************************************************************
Alastair Booker
says...
>My knowledge of Z80 is a little bit rusty, but let's see:
>- The original Z80 ran at up to 2.5 MHz
>- Z80A at up to 4.0 MHz
>-Z80B at up to 6.0 MHZ
Wasn't there supposed to be a Z80H that ran at 8MHz? I remember this
being mentioned in "Crash" when they ran an extensive article on the ZX
Spectrum Loki (which of course never materialised). Anyone else remember
this?
- Ali
[ Alastair Booker | Amiga 1200, Psion 3a, PC 486/50, ZX80 ]
[ a...@tanagra.demon.co.uk | ZX81, Spectrum 48, Spectrum 128, QL ]
[ booker_a%prode...@sb.com | Sinclair TV, Sinclair Multimeter ]
[ em...@cleveland.freenet.edu | Sinclair Calculator... and other junk! ]
Ericj Hill
: When I worked at Racal, I saw some 20Mhz Z80s. I think they were
: not from Zilog though.
: Brian
: --
: bri...@bgserv.demon.co.uk - Email for Speccy membranes
: Brian Gaff is B G Services - UK support for 'Z80'
: The Spectrum Emulator
The Z80 chip is still relatively popular. Clock speeds on "straight"
z80's from zilog went up to 12MHZ before they reccomend using a Z180/Z280
or Z8000. Personally if you are looking for a hihgly adept Z80 compatible
chip try the Hitachi 64180. Having built what I like to think of as a
"super spectrum" using one I find it to be a very versatile chip on the
low end scale. Not every application requires a PowerPC or Risc chip
to fulfill its purpose!!
p.s....
Brian Gaff
Frode Tenneboe
: The Z80 chip is still relatively popular. Clock speeds on "straight"
: z80's from zilog went up to 12MHZ before they reccomend using a Z180/Z280
: or Z8000. Personally if you are looking for a hihgly adept Z80 compatible
: chip try the Hitachi 64180. Having built what I like to think of as a
: "super spectrum" using one I find it to be a very versatile chip on the
^^^^^^^^^^^^^^
: low end scale. Not every application requires a PowerPC or Risc chip
: to fulfill its purpose!!
: p.s....
How about posting up som specs and perhaps the PCB or whatever?
-Frode
--
Frode Tenneboe, ECP/PT, CERN, CH-1211 Geneva 23, Switzerland
fro...@www.cern.ch http://www.himolde.no/~frodet
Ericj Hill
: Ericj Hill (dag...@earth.execpc.com) wrote:
The system uses a ts 2068 (gasp!! I am still looking for interface 1 and
2for the REAL spectrum) with the z80 replaced with an HD64180 running at
7.18MHZ. Cool thing about the '180 was it has its own on board mmu
allowing you to address 1Meg memory, too bad software does not exist to
use it. Bank switched memory allowed you to power up and select one of
four 16k static ram banks (used for storing different versions of the
rom). I have always wanted to increase the color capabilities but I have
no source for circuit or logic diagrams for the ULA and it was hard
enough tracking down the display code to compensate for the increased
clock speed, reverse engineering the chip and finding out how it works
for me is, well, a little time consuming right now.
In reality I was to find out later on that I had basically come
up with a hardware scheme similar to the plus 3. Oh well the joys of
experimentation.
In a another thread someone was talking about an "electronic" resource/
scanned manul for advanced spectrum users. Does anyone have any knowledge
of this ?
min...@hookup.net
>> Hi!
>> Can any one tell me what is the maximum clock speed a Z80 processor
>>will work with ? If there are different Z80 micro processorrs, what are
>>their names and what speed will they accept ? Is it possible to have a Z80
>>running at 8.192 Mhz ? 6.144 Mhz ? 4.096 Mhz ?
>> Thanx in advance.
>> Pedro
Z80 - 2.5 MHz, Z80A - 4MHz, Z80B - 6 MHz
Zilog also makes CMOS versions of Z80 at speeds of 4, 6, 8, 10 and 20 MHz
(Z84C00).
The newest communication processor core , just released, is based on their
33MHz version of Z80, so I take from it that 33MHz Z80 is also available as a
standalone chip.
I am sure I read product release info a while ago announcing
a 40 MHz version of Z80 as well.
The speed rated is a maximum guaranteed clock the chip will work at. Typically
you can exceed it by 10% - 30 % but that's not an advisable practice. Any
frequency within the rated range is OK, although NMOS versions have a minimum
clock frequency, I believe it's about 100 kHz.
Hope this helps
Michael
Pedro Bastos Fonseca
Cool! Thanks for all the informations!
but...
I really need a Z80 running at least at 8.192Mhz! Is the Hitachi
pin-compatible with a regular Z80? Is Z80C capable of working this
fast ? Are z180 and Z280 pin-compatible ? Do they have extra
features I can use ? Anyone has the tech manuals ? Does Elvis live ?
Sorry about all these questions. This thread is getting interesting
:)))
CU@IRC (Zybex @ #portugal || #atari8) <--- just made it up! :))
Pedro Bastos Fonseca
it was kept allong with the replies! Also, my messages only stay
here for 4 or 5 days! why's that ?
Ericj Hill
: Cool! Thanks for all the informations!
: but...
: I really need a Z80 running at least at 8.192Mhz! Is the Hitachi
: pin-compatible with a regular Z80? Is Z80C capable of working this
: fast ? Are z180 and Z280 pin-compatible ? Do they have extra
: features I can use ? Anyone has the tech manuals ? Does Elvis live ?
WOW.. I thought I was one of the few hardware people here!! very glad to
see many more. The HD64180 is NOT (by a long shot) pin compatible with
the straight Z80. I have always seen the super z80's as an attempt by
zilog to drift closer into the 16-32 bit world while keeping their 8-bit
safety blanket. Last I saw elvis still lives in vegas. I do have '180
tech manuals but you should be able to get them from Hitachi sales dept.
: Sorry about all these questions. This thread is getting interesting
: :)))
: CU@IRC (Zybex @ #portugal || #atari8) <--- just made it up! :))
X
H. Peter Anvin
By author: l37...@ci.ist.utl.pt (Pedro Bastos Fonseca)
In newsgroup: comp.sys.sinclair
>
>
> Cool! Thanks for all the informations!
>
> but...
> I really need a Z80 running at least at 8.192Mhz! Is the Hitachi
> pin-compatible with a regular Z80? Is Z80C capable of working this
> fast ? Are z180 and Z280 pin-compatible ? Do they have extra
> features I can use ? Anyone has the tech manuals ? Does Elvis live ?
>
> :)))
>
> CU@IRC (Zybex @ #portugal || #atari8) <--- just made it up! :))
>
Last I checked:
Z80 = 2.5 MHz
Z80A = 4.0 MHz
Z80B = 6.0 MHz
Z80C = 4.0 MHz CMOS
Z80H = 8.0 MHz
Looks like a Z80H would do the trick (8.2 MHz should be well within
the safety margin, which is at least 5%).
/hpa
--
"The earth is but one country, and mankind its citizens." -- Baha'u'llah
u01tagm
: The newest communication processor core , just released, is based on their
: standalone chip.
: I am sure I read product release info a while ago announcing
: a 40 MHz version of Z80 as well.
Why doesn't someone produce a Spectrum with one of these in it,using an out
instruction to change clock rate,and a 3.5 inch floppy drive,a harddisk,and
several mega-bytes of paged memory.The spectrum still sells well in Russia and
Escom are planning to sell com64s to in China(C= sold 800,000 64 in 1991).
Why does West Coast put one of these faster z80's in it's SAM,it would give
it a much need speed boost,and keep compatiblity.
Ericj Hill
Sounds like a swell idea. With memory costs as low as they are now and
interfaces being as simple as they are it should not be much of a problem
to incorporate an IDE drive as well. The hard part is probably in
deciphering the original ROMS and ULA (I have yet to find a schematic or
logic diagram for the spectrum ULA which is slowing down one of my pet
projects) and altering them to support the increased clock speeds. With
memory speeds being what they are now it should be relatively easy to
increase the color bandwidth as well as the sound capability.
dag...@earth.execpc.com
p.s. looking for schemtics for Spectrum, INterface 1,2 and Multiface
(among other things)
p.p.s. this group is swell!!
Simon Cooke
: Why does West Coast put one of these faster z80's in it's SAM,it would give
: it a much need speed boost,and keep compatiblity.
Ah... but the problem is that it wouldn't. Unforutnately, due to the
ASIC, faster processor speeds seem to fall over a little. There are ways
ariound that, but they involve about UKP100 of hardware...
Simon
Aleksandr A. Babaylov
:>: Why doesn't someone produce a Spectrum with one of these in it,using an out
:>: instruction to change clock rate,and a 3.5 inch floppy drive,a harddisk,and
:>: several mega-bytes of paged memory.The spectrum still sells well in Russia and
:>: Escom are planning to sell com64s to in China(C= sold 800,000 64 in 1991).
:>: it a much need speed boost,and keep compatiblity.
:>Sounds like a swell idea. With memory costs as low as they are now and
:>interfaces being as simple as they are it should not be much of a problem
:>to incorporate an IDE drive as well. The hard part is probably in
:>deciphering the original ROMS and ULA (I have yet to find a schematic or
:>logic diagram for the spectrum ULA which is slowing down one of my pet
:>projects) and altering them to support the increased clock speeds. With
:>memory speeds being what they are now it should be relatively easy to
:>increase the color bandwidth as well as the sound capability.
:> dag...@earth.execpc.com
:>p.s. looking for schemtics for Spectrum, INterface 1,2 and Multiface
:>(among other things)
There is many clones ZX in xSU without ULA, using standart chips.
I designed some of them years ago. My schemes are on paper.
big paper too A2? may be.
John M Dow
u01tagm
: u01tagm (u01...@abdn.ac.uk) wrote:
: : Why does West Coast put one of these faster z80's in it's SAM,it would give
: : it a much need speed boost,and keep compatiblity.
: Ah... but the problem is that it wouldn't. Unforutnately, due to the
: ASIC, faster processor speeds seem to fall over a little. There are ways
: ariound that, but they involve about UKP100 of hardware...
I do not see why,and even if ASIC changes are need this should not change the
price.Why not make the SAM,and/or a Super-Speccy using a single chip,the
Z80 is only 20,000 transistors and you have to make a custom chip (a ULA/ASIC)
anyway.
Mike Cowgill
>I do not see why,and even if ASIC changes are need this should not change the
>price.Why not make the SAM,and/or a Super-Speccy using a single chip,the
>Z80 is only 20,000 transistors and you have to make a custom chip (a ULA/ASIC)
>anyway.
It's true! (does this sound like a crap insurance ad?)
You can get Z80 cells which silicon compilers place on ASICs and leave the
rest of the silicon for your own use. This could easily be for the ULA,
AY-3-8910, disk controller (also available as cells). You can get 50,000 gate
FPGAs very cheaply now, it is just the compiler software which breaks the
bank.
Mike.
JOHN PAZMINO
EH> Subject: Re: Z80 clock speed
EH> Date: 1 May 1995 20:09:37 GMT
EH> Message-ID: <3o3f61$j...@homer.alpha.net>
EH>
EH> : Why doesn't someone produce a Spectrum with one of these in it,using an out
EH> : instruction to change clock rate,and a 3.5 inch floppy drive,a harddisk,and
EH> : several mega-bytes of paged memory.The spectrum still sells well in Russia an
EH> d
EH> : Escom are planning to sell com64s to in China(C= sold 800,000 64 in 1991).
It's been done in effect. Run the Z80 emulator on your laptop.
---
* RoseReader 2.52B P005004 Entered at [MOONDOG]
Hanno Foest
In article <3o3f61$j...@homer.alpha.net>, Ericj Hill writes:
[Spectrum clones]
The hard part is probably in
>deciphering the original ROMS and ULA (I have yet to find a schematic or
>logic diagram for the spectrum ULA which is slowing down one of my pet
>projects)
Look on ftp.nvg.unit.no. There's a schematic (two parts, to be exact) of a
Spectrum ULA clone usind standard parts. It's been featured as a colour
graphics card for some DIY computer in a former GDR comiuting magazine.
>and altering them to support the increased clock speeds.
I got it to work at 10 MHz.
Hanno
J.M. Foad
20, 33 and 40 MHz Z80s. Does anyone know if these are actually available
(ie. can I buy them in multiples of one) ?
Any info would be appreciated.
--
Jay Foad <jm...@cam.ac.uk>
Muhhk
: : Why doesn't someone produce a Spectrum with one of these in it,using an out
: : instruction to change clock rate,and a 3.5 inch floppy drive,a harddisk,and
: : several mega-bytes of paged memory.The spectrum still sells well in Russia and
: : Escom are planning to sell com64s to in China(C= sold 800,000 64 in 1991).
A 1Mb SIMS board is relatively inexpensive, Z80's cost next to nothing, an
IDE interface has very little hardware on it (because it's all on the drive)
and the 1772 floppy disk controller is fairly standard outside the PC and
Amiga world :)
But who's going to buy it?
Obcomp.sys.sinclair: Is the SAM Coupe still being produced and if so by who?
--
[Michael Kenyon]
[u3...@keele.ac.uk]
/~~~~~\ /~~~~~\
( o o ) ( o) Prisoner
) ( ) ( Cellblock Muhhk
(_______) (_______)
No. 007 No. 007
John J. Boyle
Hell, I would!
Package it in clear acrylic, put it on a pedestal,
and shine one of those tiny, artsy spotlights on it.
This would be a most unusual display of combined
technologies!
You, sir, are a true visionary. (compliment)
--
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
John J. Boyle Wilkes Barre, PA
75604...@compuserve.com
Remember Occam's Razor!
Hanno Foest
In article <3p7t1h$k...@gabriel.keele.ac.uk>, Muhhk writes:
>and the 1772 floppy disk controller is fairly standard outside the PC and
>Amiga world :)
AFAIK it isn't available anymore.
-Hanno