Search Posts:

Digitial MicroVAX 3100 30 System


Return to Threads

  Digitial MicroVAX 3100 30 System by Bill Degnan - 04/10/2015 14:34
MicroVAX 3100 with Storage Expansion
Pictured here is a 1988 (?) Digital MicroVAX 3100 with Storage Expansion boxes. The model number of the 3100 is DV-31BT4-A-A01 which I believe makes it a 3100 model 30. The storage expansion boxes are basically external SCSI hard drives. Their model numbers are DV-31BT4-A-A01(middle) and SZ123-XA (bottom). Click image for larger view.

Show Dev command VAX output
So far I have not done much other than boot the system from the console and run a SHOW DEV command to see what the VMS/VMB assignments are. The system is running VMS 5.2.

More photos

  VAX VMS 5.2 by Bill Degnan - 05/15/2015 18:33
Accessed the SYSTEM user, reset the password and poked around the system. Both hard drives returned present, I was able to change directories, etc. Overall system seems to be OK.

  Multinet Config by Bill Degnan - 02/22/2016 10:50
Configured the Ethernet parameters to match a newly-assigned IP for this machine. is the FQDN for this machine, contact me if you would like to connect to this box for research purposes. I can now access the box remotely which is nice for convenience.

Note - There is a switch on the back left of the unit that allow a person to toggle between the 15-pin AUI and BNC (round/old style) Ethernet connectors. I have a AUI cable, so I have that style selected.

NEXT - get email working correctly, currently when I attempt to send a message I get the error "MAIL-E-USERSPEC, invalid user specification '@GMAIL.COM' which means that I have to read the manual and clean up the old configuraton to now use my Comcast Business class network. Stay tuned.

  multinet 4.2 and SMTP by Bill Degnan - 02/22/2016 13:39
$ multinet show/version

Process Software MultiNet V4.1 Rev A, MicroVAX 3100, VAX/VMS V5.5-2

To: SMTP%""
Subj: This is a test
Enter your message, etc.

... this works and I can get messages.
* * *

Note I have to format the email differently than when I send messages from my VAX 4000-200. When I reply to email above, I get a postmaster error.

Bad address --
Error --
%MAIL-E-USERSPEC, invalid user specification ':'

let's see... Can I configure the machine to send a receive emails without old-fashioned VMS formatting.
Also, can the system receive replies from a modern Internet address and have it not get rejected by the POSTMASTER?

(for example:)
Bad address --
Error --
%MAIL-E-USERSPEC, invalid user specification ':'

I posted a question CCTECH to see what they have to say, and I will keep looking into this.

  cctech feedback by Bill Degnan - 02/23/2016 10:12
I posted some questions to CCTECH to see if anyone there knew about the older versions of Multinet and VMS I am running, as they relate to SMTP mail. Here is what I learned

"I think being able to that (without the trailing doublequote) came in with
VMS MAIL in V7.something.

If you install PMDF (which also has a hobbyist licence), you get the PMDF MAIL
client which can do this and can also do MIME attachments and is generally a
lot more capable than VMS MAIL.

* * *
Multinet is an excellent TCP/IP stack but the SMTP server included with it
is a bit limited and V4.1 is old. If you allow it to accept SMTP mail directly
from the internet, it may be difficult or impossible to secure it against
exploitation as a spam relay which would cause lots of problems for others
as well as yourself.

Having said that, it should be possible to feed mail to it from a more capable
internet facing SMTP mail server or set it up to send/receive SMTP mail on your
internal network only.

To do this, you don't need the DECnet to SMTP mail gateway you mentioned. If
this was configured on your machine, it may have been used to allow the machine
running Multinet SMTP to accept mail from the internet and pass it on to other
DECnet connected machines which did not run SMTP. ...


  SYSTEM logical by Bill Degnan - 02/24/2016 12:32
Peter Coghlan from CCTECH and I think Ireland logged into my system and found the solution to the email problem, he writes:

"I found the problem.

You can do all sorts of nifty stuff with logical names on VMS.

Somebody (presumably at the municipality) had set up a logical name for
SYSTEM. As far as VMS MAIL is concerned, this is like setting up a forward
for SYSTEM to another user, except the logical name definition did not
correspond to a valid username. Whoever did this likely intended to create a
short way of referring to files in a particular directory and not trying to
do anything with MAIL.

To temporarily get rid of the logical name I did:


Then I managed to successfully send a local test message, then another from
here over the internet.

I need to learn more about logical names then! Did not know that you could do that.

  Oops! Formatted Drive!!! by Bill Degnan - 03/01/2016 21:59
I *thought* DKA700 was a backup drive with nothing on it. I had this bright idea to back up the boot partition, DKB500 to DKA700 so if one drive died the other would be available. Big mistake. This is the drive with the MULTINET programs. Now I have to find a way to get them back on from another machine. Given that VCF XI is coming up in two months, I will have to get back to this problem in a few months. Stupid mistake!

  Building Connections by Bill Degnan - 03/12/2016 12:32
Summary of advice I got from Peter Coghlan to questions I asked about connecting one VAX to another to attempt to copy files using the external hard drive of the 3100 while attached to the VAX 4000:

I think you said that the machine was previously owned by a local municipality?
They probably had a backup strategy that involved backing up the disks to
tape. Did you get a tape drive with the machine? Were there any tapes with it?

It's not impossible that the backup strategy involved backing up to disk but
I think it is unlikely, particularly for relatively static data like the

If there are on disk backups, the strategy for creating these would have been
devised by the machine owner. Unless you have documentation from them, it
would be necessary to guess what the files containing the backups are called.
Savesets created by BACKUP are sometimes given .SAV or .BCK file extensions but
this is just a convention and they could be called anything.


will list all files with extensions .SAV or .BCK on the DKA0 disk for example
and give their sizes and creation and modification dates.

Rather than having to install it, I'm hoping that DECnet is already installed
and configured on the 3100 and on your 4000. Can you try:


on each and see what happens?

If you also have DECnet and MULTINET running on your VAX 4000, maybe I could
telnet to the that machine and then log in to the 3100 via DECnet?

With VMS, before you can use a disk or tape, it must be mounted. The system
disk is mounted automatically at boot time but other disks must have a MOUNT
command issued for them. This is usually done in the startup file. If you
moved a disk from the 3100 to the 4000, the 4000 won't have a MOUNT command for
it in its startup file and


will show it up as "Online" instead of "Mounted". Before you can access it on
the 4000, you would need something like:


where label is the disk volume label. If you don't know what the label is, try
any random label. VMS will tell you what the actual label is in an error
message and you can repeat the command with the correct label.

Bear in mind that depending on which disk controller on the 4000 you attach the
disk that was DKA700 on the 3100, it may show up as DKB700, DKC700 etc on the
4000. (The 700 is the SCSI id multiplied by 100 and DK indicates a SCSI disk
so those parts of the device name should remain the same).

I successfully booted up the 4000 and mounted one of the two external drives to a SCSI port of the 4000-200.

  Installting MULTINET by Bill Degnan - 03/13/2016 08:42
Turns out that MULTINET install files were already on one of the external drives.

I attached the drive to my VAX 4000-200 and Peter Coghlan connected via telnet to inspect it. He was planning on uploading a copy of the MULTINET install files from one of his systems to this drive. I could then re-attach to the 3100 and run the install program from there. In the process of inspecting the drive he found that the install files were already on the drive. What luck. Here is a capture of his log session:


In particular:

$ dir cobuck$dkb200:[000000]

[this command used to display the multinet install files]


(re-)Install the MULTINET service to the MicroVAX3100 ( on

First I initalized DKA700 and changed the label to its original USER3:

// example: $ INITIALISE /SYSTEM device label

// for my system:

next I mounted the drive:


// The MULTINET installation file instructions can be reviewed by using the
// EDIT command; or, TYPE /PAGE to view them or
// PRINT if you have a printer set up.

Next I checked the external drive installation directions using EDIT:

$ edit cobuck$DkB200:[000000]MULTINET_INSTALLATION.TXT




Email exchange between myself and Peter Coghlan:
Because this MULTINET version has already been installed on this particular
3100, you should be able to safely skip many tedious parts about checking
system parameters and checking account quotas. Whoever installed this the
first time has already done this and the results of their work should hopefully
still be on the VMS system disk.

The actual install command for my case:
$ @SYS$UPDATE:VMSINSTAL MULTINET041 cobuck$DkB200:[000000]

"...[and then] telling it where the installation save sets are located, telling it where to
install MULTINET and then answering some questions about what ip address,
default gateway, network mask and so on to use.

VMSINSTAL might try to default to installing MULTINET on the VMS system disk.
Don't let it do that as there might not be enough space there - I can't recall.
It is probably best not to try to second guess whoever originally decided to
install it on a different disk - they probably had their reasons.

> I will wait to hear from you if you have any advice about running the
> install script once I return the drive to the 3100, otherwise I will
> carefully work through it and try to re-match up what the startup_v5 was
> trying to do.

"..There is probably very little referencing MULTINET in the startup procedures...: ..

For the record, the start command is:

Basically I installed MULTINET to the same places referenced by the statup script.




I could not start MULTINET right away. The boot script claimed the server MODPARAMS.DAT's INTSTKPAGES value was 4 but it needed to be = 10. I saw it was already correct by checking MODPARAMS.DAT by using EDIT:


(My guess is that when multinet was installed, VMS reverted the INTSTKPAGES value to 4, for some reason.)

To apply the correct value of INTSTKPAGES I ran autogen manually, as follows;


---- OK -----

At this point everything is working the way I want it to.

---- OK -----

NOTE: The install instructions include directions for installing the product license. I skipped this step.



testing (from the online manual) - - still up?



> get update_filename

It turns out that one can still access this FTP site. I was unable to get past the login phase but I only saw a welcome file, I could cd into CUSTOMER_SUPPORT but not SOFTWARE_UPDATES_VMSxyz. There was a vanilla SOFTWARE_UPDATES_VMS.DIR;1 but I could not get access to it. Not sure why.

I was able to email and telnet to other places. Inbound emails work.

Next...Setting up services and networking the Microvax to the Vax 4000 using DECNET.

I ordered a pair of CentreCOM 210T Twisted Pair Transceivers on Ebay.

  DECnet by Bill Degnan - 03/14/2016 17:09
Peter Coghlan writes:

Hi Bill,

I had a quick look around. I found that DECnet is up and running on that
machine so that should be half the battle in getting a DECnet connection to
your 4000. See log below. I just did a cut and paste of the terminal this time
as that seems to work out better than getting telnet to log stuff and include
all sorts of control codes.

COBUCK is set up as DECnet address 1.1 (area 1, node 1). Everyone seems to do
this and there are way too many machines with that DECnet address around the
world :-)

Another node - RALPH is defined as area 1 node 2. You could add another
definition for your 4000 if you want to be able to address it by name,
something like:


...assuming that you are going to give it DECnet address 1.3 and call it VX4000
(I can't remember name you already have for it.)

To configure DECnet on the 4000, you would need to use something like:


Do this on the 4000 and answer the questions. This assumes phase IV DECnet is
installed. If phase V DECnet is installed, I would suggest ignoring it and
installing phase IV DECnet - it is much simpler all around.

To start phase IV DECnet on the 4000:


You can add that line to the startup file once you have tested it.

There is no need to do any of this on the 3100 - DECnet is already configured
and started automatically there.



$ telnet
Trying... Connected.

Username: SYSTEM
Welcome to VAX/VMS version V5.5-2 on node COBUCK
Last interactive login on Sunday, 13-MAR-2016 22:53
Last non-interactive login on Sunday, 13-MAR-2016 20:39

$ show network
VAX/VMS Network status for local node 1.1 COBUCK on 13-MAR-2016 23:35:39.03

This is a nonrouting node, and does not have any network information.
The designated router for COBUCK is node 0 COBUCK.

$ set host cobuck

Username: SYSTEM
Welcome to VAX/VMS version V5.5-2 on node COBUCK
Last interactive login on Sunday, 13-MAR-2016 23:33
Last non-interactive login on Sunday, 13-MAR-2016 20:39

$ sh users /full
VAX/VMS User Processes at 13-MAR-2016 23:36:32.17
Total number of users = 1, number of processes = 6

Username Process Name PID Terminal
SYSTEM NTY2*SYSTEM 0000011A NTY2: ([])
SYSTEM NTY33*SYSTEM 0000013A NTY33: ([])
SYSTEM Time Stamp 0000010B (batch)

$ mcr ncp
NCP>show known nodes

Known Node Volatile Summary as of 13-MAR-2016 23:36:58

Executor node = 1.1 (COBUCK)

State = on
Identification = DECnet-VAX V5.5-2, VMS V5.5-2
Active links = 2

Node State Active Delay Circuit Next node

1.2 (RALPH) SVA-0 0
$ logout
SYSTEM logged out at 13-MAR-2016 23:38:08.98
%REM-S-END, control returned to node _COBUCK::
$ logout
SYSTEM logged out at 13-MAR-2016 23:38:13.10

Connection closed by Foreign Host

  creating users by Bill Degnan - 03/21/2016 12:32
Here are the unique values for this server, your server will be different. The user directory is


these are group 100 privileges, which is what existing users are set:
defprivilege=TMPMBX, OPER, NETMBX
privilege = TMPMBX, OPER, NETMBX

I created a user HJOHNSON as follows:

$ set process/privileges=all
$ set default sys$system:
$ run authorize
UAF> show [100,*] /brief
UAF> add USERNAMEHERE /uic=[100,30] /account=COBK
UAF> modify USERNAMEHERE/password=password
UAF> modify USERNAMEHERE /owner="First Lastname"
UAF> modify USERNAMEHERE /nopwdexpir /flag=nodisuser
UAF> modify USERNAMEHERE /defprivileges=(TMPMBX, OPER, NETMBX) /privileges=(TMPMBX, OPER, NETMBX)
UAF> modify USERNAMEHERE /flags=nodisuser
UAF> exit

when I attempt to log in, the username and password are accepted, but shortly afterwards the system logs the user off

"%Sorry, your default device is unavailable for login, Try again later...

Thinking that maybe I set something up incorrectly I reset the password of a user already installed in the system. I got the same "Sorry.." message.

This tells me that probably the user I created is OK, but something else is not set up correctly system-wide.

I triple checked "sam" vs. "hjohnson" I found no differences other than the directory.


Digressing a bit. When I first installed MULTINET, I skipped the step of deleting and installing a new PAK, as described by the MULTINET installation instructions. I was correct in guessing that there was no need to install the license if all I did was delete the program files. I did not know this for sure at the time however and at this point could find no user system reason for the issues.

I then incorrectly concluded that the user login problem must be related to an invalid MULTINET license. I was also incorrect in guessing that I could easily re-install the PAK by using the info I collected.

I took some screenshots of the LICENSE data thinking after I delete the license I can just re-add the same info again:

Here is what I got:

Active licenses on node COBUCK:

------- Product ID -------- ---- Rating ----- -- Version --
Product Producer Units Avail Activ Version Date Expires
MULTINET TGV 200 F 0 0.0 31-JUL-1997 (none) me that looks like a license, but at this point was not sure what Activ = 0 meant, etc. I saw the other licenses have this value too, for example BASIC..It proved useful to have saved these values, assuming this was all I needed to re-install the license. Unfortunatley I did not realize that a very important piece was missing. The license install program needs a/the checksum of/for the PAK itself, not just the PAK keys and codes.

Running the following command is a BAD decision if you do not have the PAK for a piece of VMS software (unless you're ready for a project):


And like that I deleted the MULTINET PAK. When I tried to re-add it I did not know the checksum! With no way to complete the license install I abandoned the program. Seemed like everything was still ok for now but I did not realize I had hosed my MULTINET for the next time I rebooted....uh oh!

But thinking everything was OK because the license was still in RAM memory and I had MULTINET working....I moved on to try something else.

I decided to trace through sys$ to look at what gets loaded when the system boots up. Maybe there was an instruction, set to block all users except SYSTEM from logging in. I asked around and others independently suggested the same thing.

I found a line at the end of the file that I believe disabled logins, so I changed it from 0 to 5 users permitted to log in at a time....

I rebooted to test the update...BUT ka boom!

I never really got to test my changes as I was quickly distracted by a larger problem - Rebooting removed the PAK from RAM, and without the PAK in the license.ldb file, it was unavailable to load into RAM again. I hosed multinet!

I undid the startup_v5 changes and sulked..

  A new MULTINET license PAK by Bill Degnan - 03/25/2016 00:35
To get a new MULTINET license PAK it was suggested I try getting a VMS hobbyists license PAK first. I would then be able to get a free MULTINET license PAK by supplying the checksum from the vms license

1st steps here:

Step 2:

I was unable to get the license forms to work. But it was a half-hearted attempt because I did not like the idea of trading a corporate OpenVMS license for a hobbyist license (that expires) just to get MULTINET running.

I decided to look for a backdoor that would lead to a MULTINET PAK directly.

  lmfgen by Bill Degnan - 03/31/2016 09:38
First of all, you can't just "get a checksum" from somewhere else and use it on your system too unless it's an exact clone system. Even if the VMSLICENSE program accepts the values entered (from someone else's PAK), the license validation process will reject the PAK if the matching checksum that VMSLICENSE generates does not match your PAK.

My machine already has a corporate VAX license, and I already had the software installed. I did not want to "downgrade" to an OpenVMS license just to get MULTINET working. I also did not want to reformat or reinstall the OS because I have the servers original files still to be explored. That this VAX houses the City of Buckannon, VA archives for things like parking tickets, etc.

Fortunately I learned of the tool LMFGEN. It was easy to get set up. I generated a few trial and error PAK's based on my particular Multinet 4.1 version and using data I collected from the system. It did not take long to generate a PAK that worked.

Here are some screenshots I collected, plus paper notes ( not shown) that gave me clues as to required fields, what I could leave blank, and the format of the data.

show license
dir license.LDB

Here is it, the magic LMFGEN command, using the data I found:

lmfgen /product=multinet /producer=tgv /issuer=tgv /authorization=a-10-098-116512 /version=0.0 /units=200 /availability=F activity=0 /token=AA-10098-116512

From the Windows 10 CMD window, here is the output:

$! Generated by LiBREVMS LMFGEN v1.2 at 31-MAR-2016 17:17:03.00
$! Dedicated to the memory of Big Ken, the Digital Equipment Corporation,
$! and to all the digits who designed, developed, and documented the most
$! perfect operating system on the planet: OpenVMS.
$! Live, learn, enjoy and share and make our world a better place to live.
/AUTHORIZATION=A-10-098-116512 -
/VERSION=4.1 -
/UNITS=200 -
/TOKEN=AA-10098-116512 -

I printed this from my Windows 10 PC and entered these values into the License manager on the VAX at the $ prompt.

$ @sys$update:vmslicense

NOTE: If you screw up and the system does not take your data/checksum, try again with a new PAK. It took me a couple of days to figure it out.

Back in Business!

Won't do that again, sheesh!

Now I can return to addressing the problem where only SYSTEM can log in, I need to open up to more users.

  Clearing SMTP Queue by Bill Degnan - 04/11/2016 14:39
$ show queue

Log Dump from

...indicates a misconfiguration in START_SMTP.COM (which is invoked from

I posted a message to the VCFed group, see if anyone knowns how best to handle. It's causing a space issue on the system drive.

$ dir cobuck$dka700:[000000.missing.vax_common.multinet]*.com;*

To delete an item from the queue one at a time
where # is the queue number from
$ show queue

I was given a script to try:
$ IF "'F$type(ENTRY)'".NES."STRING"
$ GOTO 100$

I saved it as


  VMS Next Steps by Bill Degnan - 04/24/2016 17:50
To show the current state of virtual memory:
$ show proc/contact
(once output displays, press v key)

$ show mem
$ show disk

$ mon sys
(monitor system - in real time)

$ sh entry 905/full
(show job 905)

$ sh def
(this the UNIX equiv of "pwd")
$ set def dirnamehere
(this is the UNIX equiv of "cd dirnamehere")

Brian said to turn off in the startup file

$ set def sys$system
(change directory to sys$system)

$ set host 0
(kind of the reverse of sudo; allows SYSTEM to log in again as someone else while staying logged in as SYSTEM too. I assume this limits access to what the other login privs are, not SYSTEMs. But I need to find out.

$ del *.*;*
(delete everything in the directory that is the current sh def directory.)


You can create shortcuts. For example
(now you can type ncp to run the command on the right side of == sign)

$ mcr ncp

(mcr is I think another type of built-in shortcut)

  Setting Date/Time by Bill Degnan - 06/01/2016 14:35
If already logged in and you have permission, here is the command to reset the date and time for things like daylight savings.

$ SET TIME=1-JUN-2016:14:35

  Power Issues by Bill Degnan - 09/26/2016 09:54
The internal battery finally died, a charge maintained for 20 years perhaps. Not bad. Speaking of power, the power supplies are all showing signs of failure. I was able to boot up the complete system in June, but testing today failed to result in success.

Next: Replace internal battery and power supplies (large expansion box and main 3100 unit)

  same-name, diff volume name replace hd by Bill Degnan - 10/07/2017 13:17
Here is the procedure I used to replace a failed disk drive when the only available replacement was a same ID-name but a different volume-name drive (ID=2 aka dbk200)

Note that I had only one bootable drive with VMS 5 installed.

The issue - SYSTARTUP_V5.COM would freeze when attempting to MOUNT a drive with matching ID but incorrect volume name.

To get around the situation I initiated a minimal boot into the main OS drive:

>>> b/1 dkb500:

I needed to bypasses SYSTARTUP_V5.COM.


This was enough to boot into DKB500 to get into VMS to edit SYSTARTUP_V5.COM without running it first. Unfortunately min boot also causes the VMS to ignore othet drives thus I could not yet change the volume of the new drive as VMS did not see it. I could though EDIT SYSTARTUP_V5.COM to comment out the line where VMS MOUNTed DKB200. With this complete I could get past the point where SYSTARTUP would freeze...Save/ rebooted.

From SYSBOOT I removed the minimal boot:

>>> B/1 DKB500:

VMS completed rhe boot. From the $ prompt I initialized (formatted) the replacement drive and changed the volume name to USER2 like the old one was called. Volume names are important in VMS SCSI and DECNET environments.

I next uncimmented the line in SYSTARTUP_V5.COM to again MOUNT DKB200. I made a few other edits related to MULTINET while I was in there.

Exit/Reboot...VMS Fixed.

Side note - One of my expansion units had a bad drive and one had a bad power supply. I swapped parts around. I now have a larger DKB200, and I also have a new DKB300 that I can use as a backup boot drive, should DKB500 fail.

  Solving User Login Issue by Bill Degnan - 10/19/2017 10:26
At present any new user gets kicked out as soon as they log in, with in a fraction of a second. The session looks like this:

Password: [does not echo to screen]
Welcome to VAX/VMS version V5.5-2 on node COBUCK
Last interactive login on Thursday, 19-OCT-2017 15:14
%Sorry, your default device is unavailable for login, try again later...

EKOBLENTZ logged out at 19-OCT-2017 15:14:38.56

...Brian Schenkenberger A.K.A "VaxMan" discovered that SYSLOGIN.COM was not working correctly. It needs to be re-created.

He fixed that problem and now EKOBLENTZ can log in but cannot send email, here is what happens:

MAIL> mail
To: SMTP%""
.TMP; as output
-RMS-E-CRE, ACP file create failed
-SYSTEM-F-EXDISKQUOTA, disk quota exceeded

TO FIX - When I created the user I also needed to set up a diskquota for the new user. The following example applies to this system, but hopefully you can apply to your case. The reason I run the "diskquota show" command first is to see what others in the group already have allocated, so I can match with same values. It turns out everyone is getting 1000000 blocks

SYSMAN> diskquota show [100,*]
SYSMAN> exit

NOTE! 1000000 seems like a lot, not sure if this was done correctly by the original admin.

  Post Script by Bill Degnan - 10/20/2017 12:43
I think next actually I will start downloading software to volumes with space and install some software from here...


...but I will create new threads for those projects.

  Conclusion by Bill Degnan - 10/20/2017 14:45
I am starting to think the person who set this server up initially did not know what he was doing. Brian Schl. very much thinks so, he is a professional VAX admin.

why is the PERMQUOTA=1000000 ?? Seems very high for this era of a system.

I guess I'd say the most important assumption NOT to make is to assume that persons from the past knew what they were doing. Equally important, don't listen to people today either, they may not know what they're talking about either. Best to do it yourself.

The last thing I will do is back up the entire boot OS so I can keep a copy of what it was. I may just install an entirely new VMS version onto DKB300.



Buy a Commodore Computer Poster

Popular Topics and FAQs

  • Commodore B Series Tips and Tricks
  • Aerocomp TRS 80 M 1 Expansion Unit DDC
  • Items Wanted
  • Lobo Max 80
  • Zenith Z-19-CN
  • Prototype PET 2001 photo
  • Using Toggle Switches to Analyze Memory
  • Commodore Disk Archive Project
  • PET 2001 Prototype at Gametronics 1977
  • Jim Butterfield Photo
  • IMSAI 8080 With Processor Tech. Cutter
  • Secrecy is the keystone of all tyranny
  • Cromemco System Three
  • Northstar Horizon - Boot Problem
  • Computer History and Restoration Links
  • Commodore BX-256-80 - 8088 Co-processor
  • S-100 board testing with Z-80 ICE
  • Donner 3500 - an early portable computer
  • Digital (DEC) PDP 11/05 NC Assembly
  • Univac 1219 rescue
  • Fido BBS listing node list 6-13-1986
  • PDP 8e
  • MITS 88-2 SIO (2SIO) for BASIC
  • Visual Technology Inc Model 1050
  • Amiga 2500 Restoration
  • The Evolution Of IBM Computers
  • Replacement teletype print hammer head
  • Archiving and Copying Software 101
  • Computers Built 1940 - 1950
  • CBM B-520 (a.k.a B256-80 or B500 256)
  • RCA COSMAC Microkit
  • Commodore 64K C-116 Mods
  • MITS 8800b Turnmon 9600 baud
  • Catweasel, 8in and 5 1/4
  • Raspberry Pi as Gateway to Internet
  • Digital PDP11 late 1969 early 1970
  • PDP 11/40 72 inch cabinet model
  • PDP 11/40 Industrial 11 model
  • Digitial MicroVAX 3100 30 System
  • Digital VAX 4000-200
  • Commodore 64 / 1541 DRIVEKNOCK
  • Booting the System Using RL02 drive
  • PACS: Reflections by Kathleen Mauchly
  • Tele-Graphic Computer Systems Inc.
  • Commodore B Series SID Jukebox?
  • Installing Core into PDP 11/40
  • Setting Up OpenVMS 7.1 DNS CLERK
  • Felt-Tarrant Comptometer Model J
  • NextStation Color
  • Digital Rainbow (PC100-B2)
  • 1970 Compusad Compulogical Tutor
  • Archiving Papertapes Using DSI NC 2400
  • 1976 P.C.C. Features the MAI JOLT 6502
  • 1961 Beckman DEXTIR Computer
  • UNIVAC 1 and UNIVAC File Computer 1
  • Past Issues:


    This image was selected at random from the archive. Click image for more photos and files from this set.