I uncovered some "vintage" Tandy DeskMate software on five 3.5"
floppies. Labeled (Radio Shack?) Catalog No. 25-3551, (C) 1984, 1990.
Anyone want them for $5.00 plus Media Mail postage from 65775...
please contact me offlist.
I have been working on my TCP/IP stack for DOS, adding IP fragmentation
support. There are not too many more features that I want to add to
make it 'complete' before I open source the code and IP fragment support
was a big one.
I am having a terrible time testing it though. It seems that IP
fragments out in the wild are pretty rare. I tried connecting to a slew
of remote FTP sites hoping to find one that was behind a really bad
network, and thus would have fragments coming from it. No joy.
It seems that there are a lot of tricks out there to prevent fragments
>from being created, especially when using TCP. The only way I can test
the code is to send myself oversized UDP packets. If it works for UDP
then it should work for TCP too, but I'd really like to test the TCP
path explicitly. Combine the tricks with modern broadband and getting
fragments is really difficult.
Even on the home network I am having a hard time getting fragments. I
put a Linux box between the DOS PC and a Windows machine, and set one of
the Ethernet MTUs to 576. Well, that didn't force fragments because the
Windows box is too clever. I could start turning everything off in the
registry, but I really don't want to get that involved.
Off the top of my head I think I am going to have to get another Linux
box and dumb that down, if it is possible. Dumbing Linux down to turn
off the features and then restoring it to a good state is probably
safer/easier than doing it with Windows.
Does anybody have a good technique for setting up a simple network that
will result in IP fragments of TCP?
On a related note, is this even worth it? I don't know of anything that
needs to send fragments except for NFS over UDP. There might be other
applications that send big packets over UDP but those would be the only
class of applications that absolutely require fragment support. With
TCP it is nice, but a user should be able to get around any problem by
setting the local MTU to 576.
Please, I just ate.... The iPad is another Apple marketing success, but it isn't "defining" in any sense. Just because the bleating masses bought a bunch of them doesn't mean it's a meaningful step in any direction except profit. It just means that the marketeers at Apple are without peer. That's not a compliment.
Keep in mind that I'm typing this on a PowerBook - I'm not anti-Mac. I own and really enjoy a 7" Android tablet device - I'm not anti-tablet. (I also own a Fujitsu Stylistic Tablet PC that I bought a long time ago, and if you want to sit down over a couple of beers I'd be happy to talk about its strengths and weaknesses and why the "Tablet PC" was ultimately doomed.) I'm not anti-"device", as I've been saying for some time that the "Personal Computer" has had its day and will be supplanted by "devices" that are not recognizable as computers - and it's happening, with the proliferation of mobile devices as the primary mechanism for consumption of information technology for millions of people around the world. (Why does Microsoft do so poorly in this market? Because it's in their DNA to tie it to the Personal Computer.)
But the iPad? Yuppie status symbol. Yet another expression of Steve Jobs' control freak personality. Dead end. IMHO -- Ian
From: cctalk-bounces at classiccmp.org [cctalk-bounces at classiccmp.org] On Behalf Of Liam Proven [lproven at gmail.com]
Sent: Sunday, October 03, 2010 9:15 AM
To: General Discussion: On-Topic Posts Only
Subject: Re: Voice recognition will never kill the keyboard was: Re: Evolution
On 2 October 2010 19:59, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
>> For the existing apps that are mouse-centric, I see touchscreens
>> replacing them, but for things that are text-centric I don't see that
>> as a good transition.
> TOuchscreens have been tried in the past (the most obviosu example is the
> HP150 'Touchscreen PC') and I think they were always found to be less
> convenient to use than a mouse or trackball. You have to move your hand
> further (keyboard to screen rather than keyboard to mouse on desk near
> keybaord), and you arm/hand is not supported (e.g. by resting it on the
> desk) when you are doing the pointing.
Well, yes, in 1983 they quite definitely weren't viable yet. :?)
The iPad is the defining device of this technology, at least so far.
It isn't a desktop computer and doesn't try to be. It's not a Mac,
it's not Mac-compatible. It has no windows, no desktop, no menu bar,
no Dock or trashcan. No keyboard, no screen, no system unit, no
removable media, no hard disk or floppy drive.
It is a *device*, not a "computer". (Even though it runs Unix.) It
sits in cradled in your lap or held in your hands as you operate it
with your thumbs. The screen /is/ the computer. It weighs under a kilo
and the battery lasts a day of use.
And despite it being nothing like anything anyone is used to, it sold
about three million devices in its first month or so.
Liam Proven ? Info & profile: http://www.google.com/profiles/lproven
Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com
Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419
AIM/Yahoo/Skype: liamproven ? MSN: lproven at hotmail.com ? ICQ: 73187508
I came across a set of disks labeled "Janus CP/M-86 Compiler", "Janus
CP/M-86 Linker" and "Janus CP/M-86 Support" from RR Software. I presume
these have nothing to do with the Janus lanuage created in 1990, but
instead has something to do with reversible computing, if Wikipedia is
accurate on this. How rare is this find?
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
Q: What is the most annoying thing in e-mail?
I am posting this on behalf of Todd - see below:
I have a Xitan XOR-100, which is an S-100 bus system with 8-inch floppy drives running CP/M.
Along with that is a Televideo TVI-950 terminal.
I have most of the manuals and other documentation.
I also have a non-booting Apple Macintosh SE (10MB internal disk) with a third-party external 20MB SCSI drive.
toddlitwin at charter.net
Have a BA23 pedestal enclosure I'd like to get from Rockville MD
the local UPS store down there wan'ts $60ish for packing
(the $30+ to ship).
So, thought I'd see if anyone was making a run through that area up this
chance. Probably not, but thought I'd check anyway.
Let me know if you are.
I just found another great site in Germany:
in which he redesigned the dc-dc converter board inside the BP-8
with surface-mount components, and even sells them... for $25 plus
$12 postage :(
Guess I'll be using 9V batteries, or perhaps tuck a rechargeable
one (which is really only 8.4 volts) inside the plastic case with
a suitable diode and resistor for charging from the wall-wart.