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PDP-11 MUD – Building the production box
Initially I have decided to run the MUD on a microPDP-11/73 running BSD 2.11 Unix.
The chassis was fitted with a 4MB memory card, a third party eight channel DZV-11, a ethernet card and a CMD CQD-220 SCSI controller with a 18GB SCSI disk in an external case.
To get BSD onto the disk, I hooked it… »
PDP-11 MUD
I’ve frequently been questioned as to why I collect old computers and what they actual do. This has traditionally been a hard question to answer although this is equally true of most collecting hobbies (why do people preserve Model-T fords when a modern car does the job so much better!).
However it has left me with… »
Inventory: My Module Spares
This is a list of spare modules I have in my collection:
G7273 X 10 – U – Bus Grant & Non-processor grant
M105 X 8 – Q -Device selector for PDP-11
M4002 – U – KWV11-C Programmable Real-Time Clock
M7390 – Unknown
M7513 – Q – RQDX extender for RQDX1
M7555 X 20 – Q – RQDX3 MFM Winchester and… »
DECWriter III Rebuild
To give a nice period console to my 11’s I decided to have a crack at rebuilding the DECWriter III that has sat forgotten in the corner of my office for the last few months. The terminal was in a pretty mucky state, so I started with a deep clean using solvent based cleaning fluids…. »
Join DiscussionNew Arrivals: TC11 + TU56, TU55s and an 11/40
Some highly treasured items have just joined my collection, a TC11 and TU56 together with a further 3 TU55 drives and parts to build up a second 11/40.
I plan to use the TC11 and TU56 on my forthcoming 11/40 rebuild.
TC11
TU55
TU55
… »
HOWTO: Create a MSCP MAP in RT-11
RT-11 is restricted to each devices is limited to 32MB of usable space. This is due to the filesystem using a 16-bit field to represent blocks, giving a maximum of 65535 x 512 byte blocks.
For larger MSCP disks, such as RD53, RD54, RA series and third party disks, all is not lost. Within RT-11 a… »
HOWTO: Create Logical Disks under RT-11
Logical disks are a convenient way of getting round the lack of a directory structure in RT-11. A logical disk is a file which can be mounted as a virtual storage device.
To make a logical disk:
Create an empty file to act as your logical disk:
CREATE [filename]/ALLOCATE:[number of blocks]
For example:
CREATE GAMES.DSK/ALLOCATE:500
Mount the file as a logic… »
The collection gets a new home
My collection finally gets a new home. Having spent the last 3 years in hibernation in a local barn, I have moved everything into a spare office. Join Discussion The 11/05 returns to life
Over the last few days I’ve returned one of my PDP-11/05s to life.
These are the steps I went through to get it back to the land of the living.
A general clean of the interior which had become full of the remains of its foam sound insulation. I removed this with a combination of gentle brushing,… »
Inventory: 3rd party QBUS cards
I have the following 3rd part QBUS controllers:
Emulex QT13 – Tape controller
Emulex QD21 (4 off) – ESDI disk controller – Emulates MSCP
Emulex QD32 – SMB-E controller – Emulates MSCP
Emulex CS09 – 16 port serial – emulates DHV11
Emulex SC03 – SMD controller – emulates RM11/RM03
Emulex TC02 – Tape controller (Pertec) emulates TS11
Emulex CS02 – 16 line… »