That's dead, I'll replace it. Should I also change the black bar-
shaped 7.5 v cell? It's dead too, and I don't know what it's for.
>> The thing powers up off the keyboard, like a mac. I tried powering it
>> off a PC SMPSU, otherwise loaded by the PC from which it came. The
>> PSU was working fine, and I got correct voltages, even the right
>> voltages on the external power connector on the laptop (I connected
>> the wires to the battery terminals). And now matter how many times I
>> pressed the on button, the #*%^)!$ thing wouldn't start. Ideas?
>
>I've seen this one several times.
>
>Check/change the 3V 'coin cell' - the disk-like lithium cell that's
>hidden inside the machine. It's needed for the power-on switch to work.
>
>-tony
>
>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
< >Another is more complex but offers a few more possibilities. Use on the
< >the interrupt levels and put ram at the rom addresses. The load vector
< >can then be used to copy the ROMS from somewhere else to low memory. By
< >doing this rom patching can be done or complete overlay of that 8k space
<
< Of course, but it also would require a *lot* of hacking to get done
< and has some potential dangers. Mind you, P0 and P1 are free on the
< 9901 and could be used as "page bits" for multiple segments of
< ROM/RAM. Personally I like to keep things simple. Writing ROM
< overlays is not fun and I'd rather avoid it. B'sides, if I can get
< away with just using 2 *Very cheap* TTL components, so be it. I'll
< still put POLLs in my software, but I'll include an IFD in my macro
< and compile 2 versions, one with, one without.
Not really. the trick used in 9900s is to use load to start a rom based
program that copies itself to where ever needed and then turns itself off.
The way I'd do it is to put a small rom at F000h and ram where the old roms
were. The old rom can then be located at D000h with only a few bits (one)
needed to turn off the old roms and the boot room. I do this all the time
with Z80s to get the system totaly ram based but with the advantages of rom
start up/restart. The trivial trick is to make it seem invisible. the big
advantage is if you want to use the memory for something else you can but
makesure to do a relod if you want things back to normal.
I recently got an extra console that will be modified so that a pair of
32kx8s will map in to where rom, and 32kb expansion ram would be.
IE: 0000->3fffh and A000->FFFFh. using 2 32kx8s keeps the chip count low
even though 50% is wasted, besides they are cheap. The effect is the
system could be much faster as it does not need the PEB access for base
ram.
I may want to yuse the full 64kb of the pars so I need to know how one of
the larger cards like the corcomp 512k map. Do they do it as if it were
multiples of 32k or are the two segments (2000->3FFFh and A000->FFFFh)
mapped seperately or is it done in 8k segments?
< Just a little FIFO would work well, but then, if the CPU bottlenecks
< on data because it is physically too slow to even PROCESS the data,
< such high data rates become useless and potentially dangerous.
Not really it's a matter of buffering the data and post processing it
when the tide slows or issueing an Xoff/suspend to stop the flow before
the buffer overfills. This situation is nothing new, though in the world
of CPU with clocks in the UHF region people may forget that. However the
problems of data arriving faster than it can be processed is old hat.
Besides with a ramdisk buffering a few kb of data is nothing.
Allison
Okay, for me it's easy: <http://www.sinasohn.com/clascomp/> 8^)
Not listed is a "101 California" terminal, a Zenith keyboard terminal,
Fujitsu Stylistic 500, Everex 386 Laptop, and the 128K mac, Altos 8000, HP
3000, HP 9000/310, and hp9000/345. Hmmm. And the odd 8-bit atari, and the
MSX machine, and a few others that don't really fit into my collection.
So, it's a little over 100, of which 80+ are portables.
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
roger(a)sinasohn.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.sinasohn.com/
Do you know what Hello Kitty is?
If so, amuse yourself with the following...
http://www.sanrio.co.jp/products/notepc/notepc.html
Ignore the Japanese, what you're intersted in is down a little ways.
When they make one like Ami-chan's got, I'll be interested.
-------
< knowing that the thing must be turned. What's a CLI?
< >(There's a great scene in In & Out involving a rotary phone... makes
< ya
< >think about the future of CLI's...)
Command line interface... what you say to dos if ther isn't winders in the
way.
Allison
On Jul 18, 22:53, Tony Duell wrote:
> Subject: Re: How many computers?
> > My friend reports that the Graduate doesn't have a BBC ROM, and indeed
> > doesn't use the Tube. It uses the 1MHz bus to access BBC I/O,
apparently.
>
> You know, I thought I remembered it having a 34 pin ribbon cable. (1MHz
> bus, not Tube).... Time to dig it out and experiment.
>
> How on earth does the Beeb know it's there, though, without a ROM.
> Acorn's MOS (the Beeb ROM OS) doesn't look for peripherals on the 1MHz
> bus, surely?. I can't believe it needed a BBC disk as well...
Yes, I find that very odd too. The address lines, page selects, and R/W
signals on the 1MHz bus are unidirectional (direction: out of Beeb) so
about the only things the Graduate could control would be the NMI, IRQ, and
analogue input lines.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
>
> On Sun, 19 Jul 1998, Wayne Cox wrote:
> > Hi, I was given this email address as being the "Classic Computer
> > Collectors List." Not sure if it is a "subscribe to" mailing list or an
> > individual.
>
> This is THE place 8-) Hope you got subscribed ok - if not - try again.
> And stand back for about 50+ messages a day ranging from Z1 to the - well
> latest thing (frowned on but never ignored 8-)
>
> > I have some antiquated DEC equipment I'd like to see find a
> > good home and was refered here.
>
> Interesting thought - I mean IS there such a thing as an -
> 'antiquated DEC equipment'
> I thought not 8-) Your ISP is out of Ohio... Is that where the equipment
> is? A list of what is available and where would help out a lot.
>
> > -Wayne Cox
> > wcox(a)infinet.com, wcox(a)usaeroteam.com
>
> Once again - Welcome!
>
> BC
> =========================================================================
> Name: Classic Computer Rescue List
> URL: http://www.geocities.com/BourbonStreet/1055/classic.html
> (Collectors by areas)
> Name: The Classic Computer Encyclopedia Page
> URL: http://www.xnet.com/~danjo/classic/
> (Darn near dead - no input for about 6 months...)
> Name: Classic Computer ListOp
> URL: http://haliotis.bothell.washington.edu/classiccmp/
> (Hmmmm... Bill - ya want to move this to a working system?)
>
And don't forget Bill Yakowenko's classiccmp distributed Web-page archives at
http://www .cs.unc.edu/~yakowenk/classiccmp
and Doug Yowza's classiccmp FAQ backup at
http://www.yowza.com/classiccmp
Does anyone know if haliotis is still archiving ? My machine always hangs
when I try and access it.
ciao larry
lwalker(a)interlog.com
lwalker(a)interlog.com
The thing powers up off the keyboard, like a mac. I tried powering it
off a PC SMPSU, otherwise loaded by the PC from which it came. The
PSU was working fine, and I got correct voltages, even the right
voltages on the external power connector on the laptop (I connected
the wires to the battery terminals). And now matter how many times I
pressed the on button, the #*%^)!$ thing wouldn't start. Ideas?
>Surely you mean 170mA here. It's normal to charge at the C/10 rate, at
>least when trickle charging. And I'd give it about 14 hours to make up
>for losses in the battery (you never get the energy out that you put
in).
>
>> If the 'float voltage of the battery goes over the 12v figure, that
will
>> cut down the charging current. The _best_ thing would be a
milliammeter
>> on the PS output, and a variac controlling input of the _big_ PS.
>
>Wait a second. I thought he was using a PC power supply. Those have
>internal regulation. Hanging one off a Variac won't do a darn thing
apart
>from test the line regulation of the PSU.
>
>>
>> Now, as to whether or not you can get away with the 'big PS' on the
>> laptop instead of the battery? If at all possible, don't try. The
>> battery is providing an imense ammount of conditioning to the
incoming
>> power flow. (There are amazing ammounts of garbage floating on top of
>> the normal PS output. [everything from 'lightning induced spikes, on
>
>Every regulated power supply that I have ever seen has a fair amount of
>internal filtering. Now while it's not a good idea to only load one of
>the subsiduary outputs of an SMPS (and remember that in a PC PSU, the
5V
>output is the main one, from which the regualtor sense lines are
taken),
>I think that noise on the output would be the least of your worries.
>
>> down to spikes from the local refrigerator turning on].) If you
_must_
>> try, it won't hurt to throw a few thousand mfd of capacitor across
>> things. Voltage wise, you are probably O.K.
>
>There's probably 2200-4700uF inside the PSU across the 12V rail.
>
>>
>> Chuck
>
>-tony
>
>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
Puh-leeze! With humour that consistently bad, let me make a suggestion. 86 the
pathetic attempts at humour. Keep on topic without trying to be cute all the
time.
Ghia
In a message dated 98-07-20 21:14:48 EDT, you write:
<< One thing that can be said for those ancient Western Electric clunkers
is that they can't be killed, they can only be landfilled at a
crossroad with a stake through the bell. Rumour has it that that after
World War III the cockroaches will be able to use them to call Elvis.
--
Ward Griffiths <mailto:gram@cnct.com> <http://www.cnct.com/home/gram/>
They say that politics makes strange bedfellows.
Of course, the main reason they cuddle up is to screw somebody else.
Michael Flynn, _Rogue Star_
>>
While we're on the subject of old phones and phone systems, if you're ever
in Edmonton, (Alberta, Canada) there is a pretty cool telephone museum
there. Edmonton had something like the first phone system in Alberta or
maybe even Canada. Anyway, I thought it was pretty cool.
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
roger(a)sinasohn.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.sinasohn.com/
