ZX Spectrum 48k
Common Name: Sinclair Spectrum
Memory: 16k & 48k
Type: Home Computer
Origin: United Kingdom
Year: 1982 - 1984
Rubber keyboard (40 keys) with up to 6 functions each!
CPU Zilog Z80 A
SPEED 3.5 MHz
RAM 16k or 48k (42k left for programming)
ROM 16k (Basic & OS)
TEXT MODES 32 x 24
GRAPHIC MODES 256 x 192
COLORS 8 with two tones each (normal and bright)
SOUND 1 voice / 10 octaves (Beeper)
SIZE / WEIGHT 23 x 14,4 x 3 cm / 550g
I/O PORTS Expansion port, tape-recorder (1200 bauds),
RF video out
POWER SUPPLY External PSU, 9v DC, 1.4A (centre polarity
PERIPHERALS ZX printer, ZX microdrives, Interface
PRICE 16k: 282 (France, 1983) - 48k: 365 (France,
16k: £99 (UK 1984) - 48k: £125 (UK 1984)
Sinclair ZX Spectrum was a small home computer released
in the United Kingdom in 1982 by Sinclair Research.
Based on a Zilog Z80 CPU running at 3.50 MHz, the
Spectrum came with either 16KB or 48KB of RAM (an
expansion pack was also available to upgrade the former).
The hardware designer was Richard Altwasser of Sinclair
Research and the software was written by Steve Vickers
(on contract from Nine Tiles Ltd, the authors of Sinclair
BASIC). Sinclair's industrial designer Rick Dickinson
was responsible for the machine's appearance.
Released by Sinclair in 1982 and available
with either 16KB (£125, later £99) or
48KB (£175, later £129) of RAM and 16KB
ROM. Remembered for its rubber keyboard and diminutive
The rubber keyboard (on top of a membrane,
similar to calculator keys) was marked with Sinclair
BASIC programming language keywords, so that pressing,
say, "G" when in programming mode would
insert the BASIC command GOTO. Programs and data were
stored using a normal cassette recorder.
to remove and wash your 48k Speccy rubber!
Note: The following
instructions are followed out at your own risk..
Once the five screws and the rear is removed, you'll
find that the keyboard membrane is attached to the
pcb via two ribbons.
Skip to Step 3) if you do NOT need to remove the membrane.
Remove the ribbons if you need to also detach and
remove the membrane that sits beneath the rubber keyboard
- carefully hold both sides and pull gently until
detatched - for both ribbons.
The keyboard can be removed from the top casing -
unfortunately the only method is to first remove the
top metal template where some of the extended speccy
commands are printed.
This is normally glued underneath and will have to
be re-glued if the stickyness does not hold when re-seated.
The rubber keyboard should now lift off the case easily.
I soaked my keyboard and template and gently washed
it in warm soapy water. I wouldn't recommend anything
else as harsher checmicals may remove the print.
6) Once washed, remove and dry thoroughly
before attempting to re-install.
7) I spend 15 mintues washing in between
the nooks and carnnies and was surprised how much
of a difference both parts came up! Well worth the
effort in my opinion.
8) Re-seat the keyboard and the template
on top. Press firmly and test the stickyness - additional
adhesive may be required to firmly attach the template
(remember your speccy is over 26 years old!)
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