Last updated
14 Feb 1998
sinclair@nvg.ntnu.no
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The ZX Spectrum
Sinclair's
most famous machine by far was, of course, the ZX
Spectrum. This was the biggest-selling
British-designed home computer of all time and
won Clive Sinclair a knighthood for
"services to British industry". In 1983
a Spectrum was even, rather cheekily, presented
to the Japanese Prime Minister by Margaret
Thatcher as a symbol of British technological
prowess. Today, Spectrum emulators can be found
on almost any machine and many thousands of
Spectrum programs have been converted to emulator
formats.
The original
machines are very easy to find - the standard
second-hand prices are between £20 (the 48K
Spectrum) and £60 or so (the +2 and +3). In
addition to the Loot magazine link
below, good places in Britain to look for
Spectrums are the Cash Converters chain
of second-hand shops and the Computer
Exchange next to Notting Hill Gate Tube
station in central London. Second-hand Spectrums
can usually also be found at virtually any car
boot sale worthy of the name.
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16K
/ 48K Spectrum
The 16K / 48K Spectrums
(above) were the first of seven
versions of the Spectrum to be released in
Britain between 1982 and 1987. The 16K Spectrum,
which could be upgraded internally to 48K, was
rapidly superseded by the more expensive version
which had 48K already installed. By modern
standards, it was a primitive machine: a Z80A
processor running at 3.5MHz, with a 256x192 pixel
resolution and a choice of eight colours (the
catch being that you could only use two colours
per 8x8 square, leading to the infamous
"attribute clash"). Its implementation
of BASIC was pitifully slow, and the "dead
flesh" rubber membrane keyboard was very
strange to use. Nonetheless, it came to dominate
the 8-bit computer scene in Britain and fostered
an enormous pool of programing talent - today,
British firms have captured a third of the
worldwide multi-billion-dollar computer games
industry, a development for which Sir Clive
Sinclair has been widely credited.
Articles on the 16K/ 48K Spectrum
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Spectrum+
The 1984 Spectrum+
(above) was an attempt to solve the
problems of the Spectrum's peculiar keyboard,
which was replaced by "injection-moulded
plastic" keys resting on the familiar rubber
membrane. There were no other changes to the
basic Spectrum hardware. It sold adequately, but
it was soon overtaken by the first genuine
developments of the Spectrum.
Articles on the Spectrum+
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Spectrum 128
The Spectrum 128, first
launched in Spain in 1985, looked exactly the
same as the Spectrum+ save for the addition of a
large (and very hot) heat sink on the left-hand
side. Inside the casing, though, were some
genuine changes. Most obvious was the 128K of
memory, of which you could use about 104K (the
rest being used to hold a copy of the ROM). A new
three-channel sound chip, very similar to that
used later on the Atari ST, was also included, as
was a new implementation of Sinclair BASIC and a
variety of sockets. The Spanish version included
a separate numeric keypad, which was not sold
elsewhere, making it a very rare item today.
Articles
on the Spectrum 128
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Spectrum +2
The Spectrum +2
(above), released in 1987, was the first
of Amstrad's three products under the Sinclair
label and was the first Sinclair machine to be
built outside Britain (being manufactured in
Taiwan). It was relatively uninnovative, being a
Spectrum 128 with a proper typewriter keyboard,
plus a built-in tape recorder and twin joystick
ports - in other words, just like Amstrad's own
CPC464 machine. It was released in two versions -
the +2 in battleship grey and the +2A in dark
grey with a slightly different ROM. Unlike
Sinclair, Amstrad did not attempt to market the
Spectrum as anything other than a games machine
and sold it in bundled packages such as the
"James Bond 007 Action Pack" (with
light gun). Amstrad's greater emphasis on
marketing and quality control made the +2 far
more reliable than Sinclair's Spectrums and,
after the original 48K, the +2 became the
best-selling version.
Articles
on the Spectrum +2
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Spectrum +3
Amstrad's final Sinclair product,
released at the same time as the unsuccessful PC200, was the Spectrum
+3 (above). It was easily the
best-looking and most advanced Spectrum, boasting
a proper floppy disk drive, a new ROM and a
parallel printer port. The circuit design is
radically different to that of any other Spectrum
and has far fewer chips on the board. Like its
predecessor, the +3 was sold in "Action
Packs" with light guns and games included.
However, it was not as successful
as the +2 and had a number of serious flaws. The
new ROMs were incompatible with a lot of old
Spectrum software; the disk drive used Amstrad's
own peculiar 3-inch format, the disks for which
hold only about 350K and cost up to five times
more than their 3.5-inch equivalents (that is,
when you could find them - not easy nowadays);
the machine cost an absurd £250 at a time when
the far more advanced Atari ST 520 and Commodore
Amiga 500 sold for only £400; and, most of all,
the 8-bit market was beginning to collapse as the
16-bit machines swept all before them. Had the +3
been launched a couple of years earlier with a
standard 3.5-inch drive, it might have made
greater headway against the ST and Amiga.
Articles
on the Spectrum +3
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Clones
One unexpected and probably
unwelcome result of the Spectrum's success was
the proliferation of illegal clones of the
machine. This usually occured where "grey
imports" (machines imported by local
retailers rather than the manufacturer) were not
viable: often in countries which had crippling
duties on imported electronics, such as in South
America, or behind the Iron Curtain, as many
Western countries had severe restrictions on
exporting high-tech items to the Warsaw Pact.
Local manufacturers did the obvious and produced
reverse-engineered Spectrum clones.
The machine pictured above is the
CiP, a Romanian Spectrum clone.
The keyboard unit, fashioned of silver plastic,
boasts a calculator-style keyboard of superior
quality to that of the real Sinclair machine. RAM
is claimed to be 64K, and a Z80 processor
provides processing power for the entire unit.
The ROM contains only a simple tape bootstrap
loader, BASIC being loaded from cassette.
Versions of Sinclair BASIC in both the English
and Romanian languages are provided, allowing
compatible operation with the 48K Spectrum. The
copyright date of the BASIC and the demonstration
software is given as 1989, demonstrating the time
lag which existed between Western and Eastern
bloc machines at the time. Naturally, all the
documentation for the system is in the Romanian
language.
A more famous Eastern European
clone was the Hobeta (Hobbit),
produced in the former Leningrad and widely sold
in the USSR and other Eastern Bloc countries.
Other Soviet-designed Spectrum clones included
the Pentagon (above) and Scorpion,
neither which was a true clone like, say, the TS1000. Instead, they
further developed the Spectrum hardware whilst
preserving a fairly high degree of Spectrum
compatibility - more like the TS2068.
Surprisingly, such machines are
still popular in Russia: there is still a
thriving Spectrum scene. There are a number of
Russian Sinclair-oriented sites on the Internet,
but the Russians tend to rely more on their own
Cyrillic Fidonet-style networks - there is one in
Moscow called ZX-Net, for instance.
Sinclair clones were manufactured elsewhere, too;
there was a Czechoslovak clone called Didaktik Gama and a Yugoslav
clone called Delta. In Portugal, the local subsidiary of Timex
Computers continued trading after the demise of its US parent,
producing an unauthorised clone of the TS1000.
Eastern European and other
Sinclair clones are of course very hard to find
in the West. However, London's Science Museum
possesses what is probably the largest single
collection of Spectrum clones from around the
world.
Articles
on Spectrum Clones
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Articles
and Resources
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Spectrum 16K / 48K |
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Sinclair lays
a golden egg
(Personal Computer World, June 1982) |
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Professional
Power!
Sinclair's original promotional brochure |
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Sinclair ZX
Spectrum technical data
Sinclair research leaflet, 1982 |
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How the
Spectrum compares with other computers
Table issued by Sinclair Research, 1982 |
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The Spectrum:
(Sinclair and the Sunrise
Technology, chapter 7) |
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Spectrum+ |
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Unwrapping the
Spectrum+
(Sinclair User, December 1984) |
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Spectrum 128 |
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Launch of
Spectrum 128 in Spain
(Sinclair User, November 1985) |
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Spectrum 128
(Your Spectrum, December 1985) |
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Problems with
Spectrum 128
(Your Spectrum, 1985) |
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Spectrum +2 |
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Spectrum +2
(Sinclair User) |
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Spectrum +3 |
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Too little,
too late, too dear?
(Sinclair User, July 1987) |
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Plus Three,
Minus Tape
(Popular Computing Weekly, 1987) |
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The New
Sinclair Spectrum 128K +3
Amstrad's original promotional
brochure |
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Spectrum
128K +3 Technical Specification
Amstrad
promotional material |
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Spectrum clones |
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Russia's
Most Popular Spectrum Models FAQ
By Vsevolod Viktorovich Potapov (aka Random) |
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Spectrum
resources |
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Search for
second-hand Spectrums
(Loot magazine) |
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Spectrum software |
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Spectrum emulators |
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