Est. 2011 · Cyberdecks & service

We built our first deck after seven years of repairing other people’s.

Most of what we know about building decks we learned from taking apart ones that could not be repaired. Every deck we make opens with one size of driver, and we hold parts for each mark for ten years after we stop making it.

See the range Mk IV specification

A Mk IV cyberdeck open on a plain pale grey background: a bead-blasted aluminium clamshell with bolted corner blocks and a folding carry handle, an amber dot-matrix screen in the lid, a full mechanical keyboard, and a row of jacks and link sockets along the front edge. — **Plate 1** — Mk IV, CS-4D-032, as it ships. Bead-blasted aluminium, two jacks, fourteen M3 fasteners. Photographed at the works against a grey card; nothing retouched but the dust.

18Years on the bench

5Marks shipped

11,400Decks in service

94.1 %Inside bench SLA, 12 mo

10 yrParts held past withdrawal

Plate 2 · The range

Five marks, three still on sale

The Mk III is seven years into production and still outsells the Mk IV with anyone who works outdoors. It is sealed to a standard the Mk IV is not.

Mk I

The first deck we built rather than repaired.

Memory4 / 4 MB

Slots2

Released2018

StatusWithdrawn

Price—

Mk II

The one that taught us to design for the bench.

Memory8 / 12 MB

Slots3

Released2020

StatusRefurb only

Price1,180 cr

Mk III

Seven years old and still the deck we sell most of to people who work outdoors.

Memory16 / 24 MB

Slots4

Released2022

StatusIn stock

Price3,250 cr

Mk IV

The deck most of our customers should buy.

Memory32 / 64 MB

Slots6

Released2025

StatusIn stock

Price6,900 cr

Mk V

Ten months old. Built in batches of forty.

Memory64 / 96 MB

Slots8

Released2028

StatusAllocation

Price18,500 cr

The full catalogue

Specifications for all five marks side by side, memory boards and accessories with part numbers, and what is actually on the shelf this week.

Open the range →

Fig. 2.1 — The same Mk IV with the lid off. Two jacks, six resident slots, 32 MB fitted, fourteen fasteners, and nothing hidden behind anything else. Drawn to the published dimensions, so it cannot flatter them.

Plate 3 · The constraint

Memory is the scarce thing, and has been in every deck anybody has built

Every honest specification sheet in this industry says the same thing in different words: you will run out of memory before you run out of anything else. Link rate and latency can be bought with a better layout. Memory is graded, matched silicon, and there is never enough of it.

So we print two numbers, what is fitted and what the bus will take, and we tell you when the second number is a bad idea. The Mk III will physically accept a 24 MB board. We will still suggest a Mk IV, because the scheduler on a Mk III was designed around four resident programs and paying us for a board does not change that.

Fitted as standardExpansion headroomFigures read fitted / maximum, in MB

Fig. 3.1 — Memory fitted as standard, and expansion headroom, by mark. Ten years and five chassis to get from four megabytes to ninety-six.

And a 32 MB deck is not 32 MB of warez

Firmware, the ICE reserve and scratch take twelve megabytes of a Mk IV before you load a single program. Twenty are left for warez. We would rather you read that here than discover it in the field with a Sentry waking up.

Firmware & interface layer — 3.0 MBICE reserve — 4.0 MBResident warez, 6 slots — 18.0 MBScratch & cache — 5.0 MBUnallocated — 2.0 MB

Mk IV, CS-4D-032. ICE reserve is fixed and cannot be paged out.

Plate 4 · Service

Service is where the company started

Fenn Street has been taking in other people’s decks since 2011 and it still does, including our competitors’. Nothing is fitted until the figure on the docket has been agreed.

Service levels — summary. Full terms on the service page.
Level	Code	Acknowledge	Turnaround	Loan deck	Charge
BenchThe default. Post it or bring it in.	CS-SV-B	1 working day	10 working days	No	Diagnosis 40 cr, credited against the repair
PriorityFor a deck someone is waiting on.	CS-SV-P	4 working hours	3 working days	On request, same mark	180 cr per docket, plus parts
Field exchangeFleets of six or more. Ask for terms.	CS-SV-X	2 working hours	Next working day, replacement deck	Included. You keep the replacement	Contract, from 1,400 cr per deck per year

Bench, last twelve months

Bench SLA is ten working days. Median 6.2 days, 94.1 % inside. Published monthly, including the months we miss.

Parts, for a decade

We hold service parts for ten years after a mark is withdrawn. The Mk I came off the line in 2021 and is serviced until 2031.

Other makes too

Including Nitrosoft, out of warranty. We tell you before we open it whether we think it is worth the labour.

Service & repair How the company works

Plate 5 · House style

How we write a specification sheet

Every figure is measured at the works, on production hardware. The numbers that got worse are printed in the same size as the numbers that got better.

The Mk V is heavier than the Mk IV and runs half an hour shorter on a cell, and both are on its page, in the table, above the good news. Nitrosoft publish benchmarks too. Their decks are quick, and the figures held up when we measured several of them ourselves. A Mk IV bought this year will still have parts in 2039.

Every figure on this site was measured at Bay 4 on production hardware · Revision D data set · 2029