Alright, so we have a UNIX’ish OS running on our Transputer(s). After a while staring at the ‘network show’ command, hysterically giggling about soooo much computing power, you might think: Hey, what about real networking?

Yeah, you’re right, being a real man you should be able to telnet into your “Helios box”. And compared to other vintage OSes, it’s pretty easy.
The Helios installation you’re using is already set up for it. The documentation calls it the “Ethernet I” and “Ethernet II” package.

Obviously you’ll need a network interface card (NIC) plugged into your host machine. That NIC shouldn’t bee too recent, because you’ll need a ‘packet driver‘ for it. The packet driver standard was quite common in the DOS hey-days and crynwr.com still offers everything you need: Drivers, programmer reference (if you need ’em) etc..

We seem to be pretty lucky to have a Helios Version 1.31 because if I got the “Ethernet-I” documentation right, earlier versions were supporting just 2 NICs by defining ethertype WD8003 or DLINK in the host.con file. Bummer. But with a packet driver you can even use your high-end Intel 100mpbs PCI NIC.

So get the driver for your card and install it on your host. In my case it’s a 3COM 509 (aka Etherlink III), the best you can get for the ISA slot 😉 Installing the driver in DOS requires you to know some bits about your NIC: The used interrupt and the IO port. So my NIC uses IRQ10 and its port is at 0x300. To install the packet driver call it like this:

C:\> 3c5x9pd.com 0x60 10 0x300

That means: Use interupt vector 0x60 (that’s where applications hook into), IRQ 10 and Port 0x300, please. You’re done on the DOS side of things.

Initially, you need to tell Helios how to use the pc-ether driver. This step needs to be done only one time by booting into Helios entering

% gdi /helios/etc/devinfo.net /helios/etc/devinfo

and quit Helios again (by entering stopio or pressing Ctrl-shift-F9).
Before booting Helios again, make sure “ethernet” is uncommented in your host.con file. If you’re unsure what that is, go back to the second post of this how-to.

If that’s checked & done, go ahead an boot Helios entering “server“.
On the HeliosServer-display (Helios calls it “a window”) you should see a quick “/ether: Ethernet address xx:xx:xx:xx:xx” which is the MAC address of your NIC, before you’ll get to the login screen. So login and enter this command:

% /helios/lib/tcpip myHostname 192.168.1.42 -e pc-ether &

This loads the tcp/ip daemon with its parameters which are:

• Your hostname – can be anything, be creative
• Your IP – you should know an unused one (sorry, no DHCP)
• The driver to be used – in this case the driver provided by the host PC

Don’t forget it to start it into the background (&) as this is a daemon running all the time.
Finally, now that we have the socket running, we need the internet protocol daemon to run. That’s very simple, just call

% /helios/lib/inetd &

and you’re done! So quick, let’s see if everything works! Use you old friend ping:

% ping 192.168.1.1
64 bytes from 192.168.1.1: icmp_seq=1 time=46. ms
64 bytes from 192.168.1.1: icmp_seq=2 time=8. ms
64 bytes from 192.168.1.1: icmp_seq=3 time=8. ms
^C

Hooray! We’re talking to the world! Well, locally at least. Everything else is just like any other UNIX’is OS, so check /etc/hosts and the usual suspects. As you might have guessed already, there’s no way to enter a nameserver as there’s no named… it’s all IPs only.
Ah, and before I forget telnetd is in /helios/lib 😉

Final words of warning: Those two daemons need memory… quite a bit. 380KB to be exact. So it might get a bit tight in your 2MB system. If you have more than one Transputer in your system, you might think about running those on a different one. As mentioned in the previous chapter, you can add them directly in your processor map like this:

processor 3 { ~02, , , ;
run -e /helios/lib/tcpip tcpip myHostname 192.168.50.42 -e pc-ether;
run -e /helios/lib/inetd inetd
}

Also, as far as I’ve tested it, the IP stack isn’t the most robust in the world. I had some crashes here and there. Still investigating whose fault it might be.

Perfect, we have a running Helios system now. But with just one CPU it’s not that exciting as it should be. With just one MB there’s not much you can do with the system, 2MB allows to run some programs and 4MB is what you need for e.g. running the C-Compiler.

So: “More power, Igor!”

Some more background

Helios has no idea about how many Transputers are available. That’s not a shortcoming but a feature as you may not want to use all Transputers or you might like to dedicate certain tasks to a specific Transputer or you have a mixed system made of Inmos, Parsytec and Meiko parts which all behave a bit different.

This is why Helios needs a ressource map, which is a text file describing your Transputer network. As a first step, you should use ispy(a network worm tool) to identify the available CPUs in your system. Calling it together with mtest give you a list like this:

c:\> ispy | mtest  [return] Using 150 ispy 3.23 | mtest 3.22
# Part rate Link# [  Link0  Link1  Link2  Link3 ] RAM,cycle
0 T800d-25 280k 0 [   HOST    …    …    1:0 ] 4K,1 1024K,3;
1 T805b-24 1.6M 0 [    0:3    2:0    3:0    4:0 ] 4K,1 4096K,3;
2 T800d-20 1.8M 0 [    1:1    5:0    6:0    … ] 4K,1 1024K,3;
3 T800d-20 1.8M 0 [    1:2    7:0    …    … ] 4K,1 1024K,3;
4 T800d-20 1.8M 0 [    1:3    8:0    …    … ] 4K,1 1024K,3;
5 T800d-20 1.6M 0 [    2:1    9:0   10:0   11:0 ] 4K,1 1024K,3;
6 T800d-20 1.6M 0 [    2:2   12:0   13:0   14:0 ] 4K,1 1024K,3;
7 T800d-20 1.8M 0 [    3:1   15:0   16:0   17:0 ] 4K,1 1024K,3;
8 T800d-20 1.6M 0 [    4:1   18:0   19:0   20:0 ] 4K,1 1024K,3;
9 T805d-20 1.7M 0 [    5:1    …    …    … ] 4K,1 1024K,3;
10 T800c-17 1.7M 0 [    5:2    …    …    … ] 4K,1 28K,3 2016K,4 4K,3;
11 T800c-20 1.7M 0 [    5:3    …    …    … ] 4K,1 1024K,3;
12 T800d-20 1.7M 0 [    6:1    …    …    … ] 4K,1 1024K,3;
13 T800d-20 1.7M 0 [    6:2    …    …    … ] 4K,1 128K,4;
14 T800d-20 1.7M 0 [    6:3    …    …    … ] 4K,1 128K,4;
15 T800d-20 1.8M 0 [    7:1    …    …    … ] 4K,1 1024K,3;
16 T800c-17 1.8M 0 [    7:2    …    …    … ] 4K,1 28K,3 2016K,4 4K,3;
17 T800c-20 1.8M 0 [    7:3    …    …    … ] 4K,1 1024K,3;
18 T805d-20 1.8M 0 [    8:1    …    …    … ] 4K,1 1024K,3;
19 T800d-25 1.8M 0 [    8:2    …    …    … ] 4K,1 28K,3 2016K,5 4K,3;
20 T800d-20 1.8M 0 [    8:3    …    …    … ] 4K,1 1024K,3;

Wow, 21 Transputers, looks my Tower of Power 😉 Ok, so you see how the CPUs are connected to eachother and how much RAM they have, for example this line

1 T805b-24 1.6M 0 [    0:3    2:0    3:0    4:0 ] 4K,1 4096K,3;

says: Transputer 1 is a T805/25MHz has 4K internal and 4MB external RAM. It is connected with Link-0 to Transputer 0 on its Link-3 and with Link-1, 2 and 3 to Transputers 2, 3 and 4 on their Link-0. Phew, lots of colors, but it should help you reading this much easier.
Sadly, Helios cannot read this format… it uses a different one which goes like this:

network /FullTower {
Reset { driver; ~00; tram_ra.d}
processor 00 { ~IO, , , ~01; System; }
processor 01 { ~00, ~02, ~03, ~04; }
processor 02 { ~01, ~05, ~06, ;  }
processor 03 { ~01, ~07, , ; }
processor 04 { ~01, ~08, , ; }
processor 05 { ~02, ~09, ~10, ~11; }
processor 06 { ~02, ~12, , ; }
#~13, ~14; # these only have 128kb – too small for Helios!
processor 07 { ~03, ~15, ~16, ~17; }
processor 08 { ~04, ~18, ~19, ~20;
# ~21;
}
processor 09 { ~05, , , ;
# ~22, ~23, ~24;
}
processor 10 { ~05, , , ; }
processor 11 { ~05, , , ; }
processor 12 { ~06, , , ; }
#    processor 13 { ~06, , , ; }
#    processor 14 { ~06, , , ; }
processor 15 { ~07, , , ; }
processor 16 { ~07, , , ; }
processor 17 { ~07, , , ; }
processor 18 { ~08, , , ; }
processor 19 { ~08, , , ;
run -e /helios/lib/tcpip tcpip henkelmann 192.168.50.33 -e pc-ether;
run -e /helios/lib/inetd inetd
}
processor 20 { ~08, , , ; }
#    processor 21 { ~08, , , ; }
#    processor 22 { ~09, , , ; }
#    processor 23 { ~09, , , ; }
#    processor 24 { ~09, , , ; }
processor IO { ~00; IO }
}

At the first sight this looks a bit complicated, but it’s actually much easier to read than ispy’s output. If we take the last example again (without mtests addition)

1 T805b-24 1.6M 0 [    0:3    2:0    3:0    4:0 ]

the Helios version looks pretty simple:

 processor 01 { ~00, ~02, ~03, ~04; }

As you can see in my above ressource map example, there’s a bit more to it. For all details refer to chapter 2.6.5 of the Helios Manual I’ve mentioned earlier in this article.
In this case, I’ve commented out all Transputers with less than 1MB RAM because the 128K of some of them aren’t enough to even load the Helios mini-kernel (“nucleus”).
Also, you can see one of Helios’ cool features: You can bind a service/program to a Transputer at boot-time. Here are some example:

processor 00 { ~IO, , , ~01; System; }

This is my Gelach-card… with just 1MB it’s just enough for a decent basic system. The processor is reserved for use by the system. It cannot be allocated to users, and hence it is usually impossible to run applications here.

 processor 19 { ~08, , , ;
run -e /helios/lib/tcpip tcpip henkelmann 192.168.50.33 -e pc-ether;
run -e /helios/lib/inetd inetd
}

This is a 2MB T800. It is dedicated to do the TCP/IP stuff (more on IP networking later) as this requires quite an amount of RAM and CPU cycles… nicely offloaded to this Transputer.

Tool Time!

If your transputer network changes as often as mine does, it might become a drag to constantly rewrite your resource map file. This is why I wrote this little parser script in perl. It takes an “ispy | mtest” output and converts it into a Helios resource map (*.rm) file.
Yes I know, perl is not optimal in a DOS environment but I was in a hurry… maybe I’ll rewrite it in C-for-DOS one fine day.

Two more steps…

Now that you edited your resource map (e.g. network.rm) to your needs, you need to generate a binary version of it. This needs to be done running Helios. So make sure the .rm file is inside the /etc folder (below helios root) and boot your single-CPU Helios and create a map file like this:

# cd etc
# rmgen network.rm

This will create a network.map in /etc for you. Now shutdown Helios again.

Now you need to tell Helios to actually use that map file. This can be done inside your initrc file which you edit like this:

# Helios System Configuration File
# This file is interpreted by init to configure the system
# it is NOT a shell script.

# Start up the X server if required
ifabsent /window     run -e /helios/lib/window window

# Option 1
# Run the network software if necessary, and wait for the Session Manager
# to start up. Then create a console window and register it with the
# Session Manager, which will run login automatically
run -e /helios/bin/startns startns -r /helios/etc/network.map
waitfor /sm
console /window console
run -e /helios/bin/newuser newuser

# Option 2
# Run login by itself without any of the networking software. This gives
# a single-processor single-user system
#console /window console
#run -e /helios/bin/login login

This way you can now change between a single- and multi-processor system by (un)commenting either the Option 1 or Option 2block.
Now boot Helios again and you should see its initializing each Transputer while booting. When you (hopefully) get to the shell enter ‘network monitor‘ – that’s like ‘top‘ on UNIX – to indulge yourself by watching your Transputers doing… nothing/something.

Caveat: If you have more than 20 Transputers in your system (lucky you!), you might need another version of startns (copied into /helios/bin) which allows an unlimited number of Transputers to be used.

Now that we have all config files adjusted to our needs, we should try to boot it.

Normally a simple call to SERVER.EXE should do it, so try now:

C:\TRANS\HELIOS13> server [RETURN]

This should show you the booting process info and results in a bash-like shell. Hooray! You’re running a real OS on your Transputer, congratulations!

You might have stumbled over the many ‘shoulds’… well, there’s a known problem with the server. It uses very simple calibration- and delay-loops (for/next) to determine speeds and setting pauses between each command sent to the Transputer. If you computer is too fast (i.e. built after 1990) those pauses might by too short and server.exe can’t initialize the Transputer correctly resulting in boot errors 🙁

But don’t despair! Michael Brüstle, aka “Mr. T”, came to the rescue and wrote a little ‘helios loader’ which uses more precise timers but is a bit basic – in other words you have to know what you’re doing… which makes this loader a piece of “real men software” 😉
What it does is: Resetting the Transputer, putting the Helios bootstrap-image and nucleus into the Transputers RAM and then quits. So it’s not booting Helios… that’s still left to the server program. To use this tool 3 steps are to be taken:

1) Download HBOOT.EXE from here and put it into your Helios root directory
2) Change your host.con file to prevent SERVER.EXE to overwrite the already loaded bootstrap-image and nucleus. So add/uncomment these lines in your host.con:

no_reset_target  # do not reset the Transputers
no_bootstrap     # don't load nboot.i
no_image         # don't load nucleus
no_check_processor # don't check CPUs as this would need a reset, too

3) [optional] Create a batch file (e.g. START.BAT) in your Helios root folder containing these two lines:

hboot lib\nboot.i lib\nucleus
server

That’s pretty self-explaining, I guess. So enter START and Helios should successfully boot now.

Next up, using more than one Transputer with Helios…

Very well, while the filenames are streamlined now, we need to prepare Helios’ configuration files before we get things going.

Host configuration

There’s a central config file for your host, that’s your PC or more generally, the machine connected to the Transputer(s). This file is called host.con and tells the boot-programm everything it should know about your setup.
There is a host.con in your install already, but that most likely won’t fit your setup, so open it in a texteditor and adust it accordingly.
Here’s my setup which should be fine on most PCs using a Inmos B004 compatible host-interface (like the AVM B1 or most ISA-cards). I just quote the settings which might need to be changed to keep this short. The file has some documentation in-line, so read it. My comments are green:

BOGOMIPS=9999999 # This should tell the server that my PC's very fast
host          = AT  # vs. PC, again a speed info
box           = b004 # Important! Info about your interface card

helios_directory    = C:\trans\helios13 # adjust to your path if changed!

link_base = 0x150 # Important! Info about your interface card

processor_memory = 0x100000 # Define this if your card is a bit flaky, like the Gerlach :-/
ethernet # enable this if you plan to use ethernet networking.

Transputer configuration

Ok, we configured the PC-side (host) now for the Transputer side of things. For a simple start we will use just one Transputer, most likely living on your interface card.

BIG caveat: Never forget that Helios is handling text-files the UNIX way, ie. Linefeed is LF, not CR+LF like in DOS! So editinginitrc or any other config-file (besides HOST.CON) needs to be in UNIX format. Don’t use DOS edit.exe! This will change linefeeds even if you use it just for viewing file, ie. not saving them.

The config file for this is ~/etc/initrc. The one that came with the installation archive is way over the top, so you have to edit it… here’s the basic version:

# Helios System Configuration File
# This file is interpreted by init to configure the system
# it is NOT a shell script.

# Start up the X server if required
ifabsent /window     run -e /helios/lib/window window

# Run login by itself without any of the networking software. This gives
# a single-processor single-user system
console /window console
run -e /helios/bin/login login

That should be it. Next step: Let’s boot the system!

Ok, you really want to get a serious Helios buff. Good!

First, download the Helios archive. I strongly recommend to go for the most recent version, which is 1.3.1. The Archive is a huge 12MB (erm, in 1990-terms) but that’s mainly because it also includes an X11 server. Don’t get too exited about X11 though. It will only work if you have a Transputer driven graphics card!
So, download this archive, save it into a path you can easily access within DOS -8 char limit!- and un-tar/zip it there. I’d suggest something like c:\trans\helios13 (=Helios root).

Because this archive was created from a running install on a SunOS machine (I think), you will end up with some file names crippled to the DOS 8.3 file-naming scheme. So we have to do some renaming work in /ETC (c:\trans\helios13\etc in DOS terms) now:

host.equiv -> HOST.EQU
inetd.conf -> INETD.CON
protocols -> PROTOCOL
socket.conf -> SOCKET.CON

Next, change into /users (c:\trans\helios13\users) and remove the dots from the filenames in each folder (root/guest/shutdown) in there:

.cshrc -> CSHRC
.login -> LOGIN

Finally, we need to replace the SunOS binary, which is used to boot Helios, called ‘server’. You will find the MSDOS equivalent (SERVER.EXE) here. Put it into your Helios root folder.

Next up, configuration…