How, exactly, do you plan on executing BASIC programs
on an Apple I? You do realize that there was no built
in BASIC, and the cassette interface was an option?
The only firmware in the base machine was a 256 byte
monitor program.
it's an Excelan board, but doesn't
give a model number
--
It is a 201. Docs for the card and the basic firmware are on bitsavers.
I'm trying to locate the manuals for the other (VME,Qbus,and Unibus) versions
if anyone has them.
The optional downloaded TCP stack had an interesting feature that the IP
address was hardwired to the Ethernet adr. Between that, and it having worse
performance than the code running on the main processor, most people ran
the cards in logical link mode.
Hi
I'm looking for a 486 BCC laptop computer that
I can use for spare parts. Mine has a video chip
that seems to be failing. I forget the model number
but it is one of the color ones.
I use it for all kinds of transfers of data to
my vintage machines so I'd like to keep it in
working order( to keep things on subject ).
Dwight
>From: "John Honniball" <coredump(a)gifford.co.uk>
>
>Dwight K. Elvey wrote:
>> Although, not particularly good practice, as long as the
>> power dissipation is kept down, this is a design within specifications
>> of the part. They have built in current limit and are suppose
>> to be able to handle continuous loads in current limit.
>> This means that they can be paralleled.
>
>Hmmm... OK, but they still won't be sharing the current equally.
>The one that has the lower current-limit point will be at
>its full capacity, while the other one will have a smaller
>share of the load. At least, that's how I understand it.
It is true that they won't share. One will run until it
reaches its max and then the other will pick up the rest.
Remember, the biggest issue is the power ( how hot it gets ).
That is related to voltage drop and current, not just current
by it self.
>
>> I once talked with some application engineers at National
>> about this type of operation.
>
>I'm sure I've seen a note somewhere to the effect "do not
>connect in parallel", but of course I've no idea where I
>read that!
Some regulators do not have a current shut down. They you
shouldn't parallel. Others are intended to run with the
current limit. These can often be paralleled. The ones that
only do thermal shut down shouldn't be paralleled.
If you know the current load, one can add a
parallel resistor. The current load has to be relatively
constant.
If the regulators are close, adding some series resistance
can make them share. In some cases, even some additional
circuit board traces may be enough. I've seen memory banks
where there were regulators on either side of the array
and both sides shared relatively well. This is just from
the natural drop of the traces.
Dwight
>
>--
>John Honniball
>coredump(a)gifford.co.uk
>
Just took in a Superbrain-QD which was "stored" uncovered in a garage for
the past 10 (or more) years ...
It's got serious mouse damage - underneath and all around the monitor was
stuffed with insulation, wood chips and bits - obviously a large nest.
More seriously, both the main PCB and the power supply PCB are *COVERED*
in mouse droppings, and *SOAKED* in mouse urine (mostly dried up now, but
the damage has been done). Lots of corrosion and such, but it looks
repairable....
But both boards are covered in a layer of dried urine, sprinkled with generous
gobs of urine soaked manure (about the consistancy of fairly dry tar), which is
"glued" to the board.
This is the worst case of mouse damage I have seen ... I would very much
appreciate any tips that can be offered on how best to clean the boards
without damaging them... ???
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html
Hello ClassicCmpers,
Does anyone know what are the real technical differences between sun4,
sun4c and sun4m subarchitectures of SPARC from the viewpoint of an OS
kernel writer? I know that SunOS treats them as different kernel
architectures while Net/OpenBSD has a unified SPARC kernel, as does
Linux if I'm not mistaken. I'm trying to evaluate the pros and cons
of the two approaches. Reason: a friend of mine is porting 4.3BSD-Quasijarus
to SPARC and I'm trying to help him with the key architectural decisions.
We have the SunOS 4.1.4 source.
MS
> Tonight, I looked at Volume 5 and in the CD table of contents (link
>above), I see "altair32 Project Altair Emulator.zip" and two other related
>listings. As you all know, this is my baby and this person never had the
>courtesy to ask my permission to distribute my albeit free software.
> Am I crazy here? Should I contact this guy and ask him to remove it?
>Should I ask him to place a link to the project page instead? How about
>modifying the listing to include a "permission granted" message?
> Any thoughts on this?
Hi Rich,
Personally, I don't have a problem when people include my free stuff on a collection
CD which is nominally priced - what they are selling is convienence, not the material
on the disk (which can be freely downloaded).
Perhaps I appreciate this more than most, because I have to download through a dial-up
connection. On a good day I get 25kbps - it takes *HOURS* to download even a few 10s
of megs, let alone a CD or DVDs worth. It is often worth it to me to pay $10-$20 for
a CD containing the material I want rather than to try and keep a connection up long
enough to download it.
Dynacomp is not "some guy", they have been around a LONG time. I have some titles for
my Altair which were purchased from them back in the late 70s. I think they are a
reasonable company, and given the amount of material on the CD, and the nature of the
target audience, I doubt they are making a "killing" from your material.
I understand that you may feel it is somehow "wrong" that someone makes a bit of
money from your material, however consider:
- Given the amount of material on the CD, the percentage which can be attributed
to your project is VERY small. The overhead in contacting everyone on the CD,
and handling "royalties" would prohibitive in this case, and such collection
CDs would bascially not be possible.
- Do you really think the price of the CD would go up/down if any one individual
project is added/removed (Given that it is freely available elsewhere).
- As noted above, Dynacomp is a real company - this is no different than Walnut
Creek or other companies which sell compilation CDs. I've seen LOTS of my stuff
on these, and have never been contacted for permission - and it has never bothered
me.
- What about ISPs ... if you don't want anyone to charge for a CD containing your
project, then why do you allow people to charge for a network connection which
is used to deliver your project? - To my mind, this is really not much differece,
both are a form of media.
- I expect part of your reaction is due to the fact that this is Ebay, not so much
the fact that someone has included your project in a collection (which must have
happened many times before).
>Should I contact this guy and ask him to remove it?
Do you have a reason why people who purchase this collection should not have easy
access to your project?
>Should I ask him to place a link to the project page instead?
Give that I can find Altair32 with google (or any other search engine) easily on
the first try, then do you really think it necessary to clutter up the Ebay listing
with links (remember, if they do it for you, they should do it for everyone else).
I don't think people normally use Ebay as a "links" resource - the listing is long
enough as it is...
>How about modifying the listing to include a "permission granted" message?
Again, would this really benefit people looking at this collection? Would it really
benefit you? See above comments regarding the size of the listing. Do you think
anyone who is considering this collection really cares who explicitly have their
permission (given that the material is freely available anyway).
Returning to the ISP analogy, perhaps since people download via their network connection,
all ISPs should be required to explicitly obtain permission from every author of every
project which is available on the net, and display individual "permission granted"
messages and links for each one (to make sure you are aware of this important detail)
before allowing you to proceed with your connection (where you might access one of those
projects)??? - Would doing so benefit anyone? [Yeah, this is stretching a point,
however most of the people who buyt the CD will not access every project on it either,
it is just a form of bulk media]
Sorry to rant - but this is a pet peeve of mine - CD/DVD collections are one of the fews
ways that I can obtain large "free" files. Authors who prevent their works from being
included on these are going out of their way to make it very hard for me to obtain them
(to no actual benefit to themselves).
Granted it would be nice if they asked, but this is probably a lot of extra overhead in
the preparation of a large project, and you *DO* make the project freely available to
people who live in the city / have high-speed-connections.
There was a similar thread a few months back, when one of the guys who maintains a site
of archived manuals got upset that another guy was including some of "his" manuals on a
DVD that he was selling for $30 (and gives to anyone who contributes material which is
how I got it) - Insisting that I download the material prevents me from bring able to
obtain most of the larger manuals (some of which I would really like to get). - Really
annoying, considering that he doesn't have permission from most of the original authors,
and claims to be preserving them and "making them available" ... but apparently only to
the "high-speed" elite (but again I rant :-)
Lets have a show of hands ... anyone participatng in this list ever distrbure any material
without obtaining explicit permission from the orignal author?
Regards,
Dave Dunfield
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html
forgot to mention I'd like to get a copy of the programming
manual to add to the archive. I have one other manual on programming
the Pegasus from '58 that I need to get on line.
