On Nov 14, 22:10, Eric Smith wrote:
> pete(a)dunnington.u-net.com (Pete Turnbull) wrote:
> > But are you running over 10baseT (or 10base2) all the way? Zane's
system
> > might take a fair performance hit because either the hub or the switch
is
> > buffering every packet and retransmitting it.
>
> Oh, and I forgot to mention that a true "hub" (which in Ethernet terms
> is just a multiport repeater) does not buffer any packets.
>
> The newer so-called Dual Speed Hubs incorporate a two-port switch (which
> in Ethernet terms is a bridge). They don't buffer packets between
same-speed
> hosts, but will buffer packets between 10 and 100 Mbps hosts.
Which is exactly what I was referring to, since Zane described his system
as having 10Mb/s at one end, and 100Mb/s at the other :-)
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Ok time to show my ignorance again. I just brought home a logic analyzer
that has a built in computer that's running M/PM II Ver 2.1. I know M/PM
is a multi-tasking version of CPM but that's about all. Can someone tell me
more about it or point me toward a good FAQ? What kind of processor do
this usually run on? I have no one idea what's inside this box. One of
the notes that I got with this stuff hints that it will run "regular" CPM
programs. What do you know about that?
Joe
I've got a few devices with the square fuse holder in them. It's as common
as the round ones, though I've lost covers and had a terrible time replacing
them.
The ones I have use standard (3AG) fuses as do the round ones. I guess
there were a lot of guys who liked square Greenlee punches better than the
D-shaped ones.
Dick
-----Original Message-----
From: Anthony Clifton - KC0CUE <wirehead(a)retrocomputing.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Sunday, November 14, 1999 4:40 PM
Subject: Intecolor Fuse Question
>
>So I pulled the Intecolor terminal out of the car...model 8001i. The fuse
>is missing
>but I'm wondering what the deal is: It's a square fuse holder. I've
>always seen
>round ones before. Are there standard fuse types that fit this holder and
>how hard
>will it be to find a new cover for it?
>
>Thanks...
>
>Anthony Clifton - Wirehead
>
>
I have an old AT&T 3B2/600 and 2 3B2/500 computer systems. I am looking for a
boot tape and install media for them. They run AT&T unix. Any help would be
appreciated.
Thanks.
Ken Guenther
< Ok time to show my ignorance again. I just brought home a logic analyze
<that has a built in computer that's running M/PM II Ver 2.1. I know M/PM
Thats MP/M.
<is a multi-tasking version of CPM but that's about all. Can someone tell m
<more about it or point me toward a good FAQ? What kind of processor do
<this usually run on? I have no one idea what's inside this box. One of
8080, z80, z180, 8085. It's cpm with multitasking addins basically.
When it was ported to 80x86 it became CCPM.
<the notes that I got with this stuff hints that it will run "regular" CPM
<programs. What do you know about that?
It does IF the programs don't run around the BDOS, the MPM bios is often
banked and direct bios calls tend to muck up.
Allison
<DEC 3000/300LX that just isn't giveing me the kind of Xfer rates I expect,
<and I'm wondering/suspecting there is a problem with my calculations.
<Using a pair of PDF's totalling 24.6MB as my test I'm getting 8.34MB/Min,
<yet I'd expect it to be closer to 72MB/Min.
140kbytes/sec is slow. I'd expect much better than that. I'd expect better
than that using LAT/LAP/DECnet out of a VS2000. Burst rate for 10bT should
hit 1.25mbytes/sec but, averages in the sub 400kbytes/sec range are more
likely. If the eithernet is busy it can drop more.
<The machine on the other end is a G4/450 PowerMac with 100BaseT, plugged
<into a 10/100Mbit switch, the DEC3000 is plugged into a 10/100Mbit hub
<which in turn is connected to the switch.
<Of course part of this could be the 21064/125 processor, and part of it
<could be the fact I'm using Appletalk.
It's the appletalk. Try TCP/IP. It's certainly not the cpu you have plenty
of speed there.
Allison
Picked up a spiffy Intecolor terminal for free today. I recall one, circa
83 or so, used
as the console on an HVAC system at my University. They were really nice,
IIRC.
What's more interested, however, is WHERE I picked it up...from an employee at
Microware in West Des Moines. I got to see their new building that they moved
into last year. For those of you who don't know, they are the company that
sells
OS-9, used on things like Cocos alot.
At any rate, I never saw so much cool OS-9 stuff in my life! The guy who
gave me
the terminal was showing me some websites where people are doing some of the
most amazing things with Cocos.
One URL is http://bullsbarn.stg.net/, which is the home page for Penn Fest,
which
is a weekend long fest for those into Coco's. Some cool images.
People are expanding Coco's with real I/O, 4 mhz upgrades by turning off
some of
Tandy's custom chips, 2 and 4 megabyte RAM upgrades, make the graphics chip
do more colors than it's supposed to be able to do. IDE interfaces, SCSI
interfaces.
I'm not into Coco stuff personally but I was impressed at what folks are doing.
Just thought I'd share the fun.
Anthony Clifton - Wirehead
On Nov 14, 16:37, Kevin Schoedel wrote:
> On 1999/11/14 at 12:00pm -0800, you wrote:
> >I'm wondering what the effective speed of 10Mbit Ethernet is. I've got
a
> >DEC 3000/300LX that just isn't giveing me the kind of Xfer rates I
expect,
> I get 14.7MB/minute, copying four PDFs totalling 22MB from a
> substantially slower Mac (603e at 180MHz) to a much slower (on-topic:-)
> DECstation 5000 (R3000 at 33MHz) running Netatalk on NetBSD 1.4.1.
But are you running over 10baseT (or 10base2) all the way? Zane's system
might take a fair performance hit because either the hub or the switch is
buffering every packet and retransmitting it.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
I'm wondering what the effective speed of 10Mbit Ethernet is. I've got a
DEC 3000/300LX that just isn't giveing me the kind of Xfer rates I expect,
and I'm wondering/suspecting there is a problem with my calculations.
Using a pair of PDF's totalling 24.6MB as my test I'm getting 8.34MB/Min,
yet I'd expect it to be closer to 72MB/Min.
The machine on the other end is a G4/450 PowerMac with 100BaseT, plugged
into a 10/100Mbit switch, the DEC3000 is plugged into a 10/100Mbit hub
which in turn is connected to the switch.
Of course part of this could be the 21064/125 processor, and part of it
could be the fact I'm using Appletalk.
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)aracnet.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
On Nov 14, 12:00, Zane H. Healy wrote:
> I'm wondering what the effective speed of 10Mbit Ethernet is. I've got a
> DEC 3000/300LX that just isn't giveing me the kind of Xfer rates I
expect,
> and I'm wondering/suspecting there is a problem with my calculations.
> Using a pair of PDF's totalling 24.6MB as my test I'm getting 8.34MB/Min,
> yet I'd expect it to be closer to 72MB/Min.
You're basing 72MB/Min on 10Mb/s x 60s divided by 8 bits/byte? No way.
You're forgetting about the packet overheads. And the handshaking
packets. And the delay in setting up the files and buffers at the
receiving end, probably. If you're using 100/10 switchable hubs/routers,
there may be a delay in there, too (they buffer the packets if they have to
switch from their normal speed). If you were using FTP between two
machines running TCP/IP with no other traffic, I'd expect a bit more than
the sort of performance you mention, but for NFS, for example, divide by
10.
> Of course part of this could be the 21064/125 processor, and part of it
> could be the fact I'm using Appletalk.
The processor is fast enough, but a lot depends on the software stack and
the Appletalk-over-Ethernet overheads. I'm slightly surprised you're not
doing better than 8MB/min = 140kB/s, but only slightly.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
