Now that I have two functioning systems (PDP-8/A running OS/8,
PDP-11/23+ with RT-11XM) that have two RL02 drives each, I'm short
of disk packs. I'm looking for three or four.
Please let me know if you have any, and how much you want for
them. I'd much prefer disks with no bad blocks at all (but at
least none in the first 64 locations, or they won't be useable for
OS/8). My zip is 65775 for shipping calculations...
thanks
Charles
Sorry if this is a little off-topic, but after hunting around on the
net I couldn't find the right search term to find what I'm looking
for.
OK, my power company sucks. I have brownouts and power outages all
too frequently. Yet when I look at the statistics recorded by the
public utilities commission, it seems obvious to me that they aren't
showing an accurate record of what happens at my house.
So I'm looking for a device (I'm fairly certain I've seen these
before) that I plug into a wall outlet and it keeps a log of voltage
sags, brownouts and outages. Then I can use this to build a
reliability profile of my power company as raw data to compete with
their b.s. line that its never their fault when my power constantly
sucks.
Any suggestions?
--
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
<http://www.xmission.com/~legalize/book/download/index.html>
Legalize Adulthood! <http://blogs.xmission.com/legalize/>
I'm looking for a few people to connect to a small 'server' I am running
to help me test my TCP/IP for DOS. It can be reached at:
telnet 24.159.200.228 2023
It does not do telnet parameter negotiation so echo and line editing are
dependent upon your particular telnet client. I've found that the
standard telnet client in Win XP does local echoing, Win 2K does not do
local echoing, and Linux does local echoing with local line editing. If
something doesn't work just try it again without any extra whitespace
chars or backspaces.
For the sake of traffic on the list, please use discretion when replying
to this - obviously stuff of general interest should be posted publicly ..
Some background on the project:
I've been writing my own TCP/IP for DOS machines since around Nov 2005.
Everything except the packet drivers that I am using is new code that
I wrote for this project. I was busy with other things the last eight
months and I'm finally getting back to working on it. (The last round
of testing was in late Dec.)
The development machine is a 386-40 using Turbo C++ 3.0 for DOS. The
code runs reasonably well on my PCjr. Eventually I want to do a telnet
BBS. A Linux box is tracing incoming and outgoing traffic in case I
need to debug something that crops up. The test is running on the 386
today because I am doing extensive tracing in the code as well.
This particular test code accepts connections from up to 9 clients and
lets you play around with some simple commands. The idea is to exercise
the TCP/IP code with multiple concurrent connections, so please excuse
the simple interface.
Thanks!
Mike
>Roy J. Tellason rtellason at verizon.net
>Fri Sep 7 22:49:03 CDT 2007
>
>So I was poking around at bitsavers after snagging those TI databooks, and
>stumbled across some files pertaining to TurboDOS. I'd read about that
[snip]
Roy,
The NorthStar Horizon ran TurboDOS and there were special versions of the
Horizon specifically to run multiuser applications. The manuals are
available here:
http://www.hartetechnologies.com/manuals/Northstar/
I think Dave Dunfield has some TurboDOS disk images on his site:
http://www.classiccmp.org/dunfield/img/index.htm
I suppose in theory you could boot his Horizon simulator with the TurboDOS
images and use the manuals to experiment with it. If you really want to use
real hardware, you could either buy one of the specially modified Horizons
or just upgrade a normal one. I have seen the Horizon multi serial port and
the "slave processor" cards on Ebay from time to time.
Thanks and I wish you the best of luck with your search. I hope this helps.
Andrew Lynch
On a BA123 power supply, each regulator has three
non-power pins - LTC, POK and DCOK. Am I correct to
assume these are TTL level outputs? What is the
computer expecting to get from these three lines if
everything is OK?
-Ian
Hi,
Can anyone help me with detailed information of the IBM ANR coax protocol
used
between IBM 3271/72 and IBM 3277 terminals ?
'ANR' stands for Alpha Numeric Replacement.
This is what I know sofar of the ANR protocol:
- transmission was done with words of 13 bits.
- one bit time was 7 x 210nS = 1.47 uS (Not sure about the 7 x)
- a logical ZERO was defined as an negative pulse of 210 nS.
a logical ONE was defined as an negative pulse of 630 nS. (3 x 210 nS)
- the 13 bits where used as follows:
bit 1 - start bit (Busy bit)
bit 2,3,4 - control bits
bit 5 - 11 data bits
bit 12 - odd parity over bits 2-11
bit 13 - buffer size (480 / 1920 bits)
Transmission started with a dummy word with all 13 bits zero.
I assume this was needed to establish word synchronisation.
Followed by a WRITE CW1 and 480/1920 words.
The 480/1920 words can be of any mix of attribute / data words.
Currently I am building an async RS232 to ANR convertor and having
difficulties in
transfering data to an original IBM 3277 model 1 terminal.
The problem is most likely timing.
Does any one have an answer on the following question:
Q1: the exact bit time ?
Q2: exact pulse duration of logical ZERO and ONE ?
Q3: time between words (if any).
Q4: how was serial synchronisation maintained ?
Any piece of information of this ANR protocol is welcome.
Thanks !
Henk
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Jerome H. Fine said:
> Just as there were inquiries about using PDP-11 hardware, I thought
> that it might be helpful to know if anyone uses RT-11 and for what
> purpose.
I'll pipe up here and confess I never professionally worked with RT-11, or any other DEC OS, for that matter, except for a very, very short 2-month stint with RSTS/E. And all I really was doing was making some small adjustments to DIBOL-coded accounting software for a customer. Then my world shifted, and I was sucked into the world of networking PC's (Novell) where I spent the better part of my career.
Anyway, I *am* using RT-11 to image my collection of floppies (some of which probably belong on Tim Shoppa's site; TOPS-20 related stuff, looks like). Other than that, I'm basically a complete DEC newbie, and am just starting to dip into MACRO-11 on RT-11. Part of a pickup included a college textbook focused entirely on RT-11 MACRO-11, so I'm having some fun! :-)
As for Ethan's interest in a Z-machine, I'll second that! But I don't even know where to start!
- Jared
PS. Thanks, again, to all that assisted the reviving of my PDP-11/03!
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