The Sinclair ZX Spectrum was one of the most popular European computers of the 80's. Two models were launched: one with 16 kb RAM and one with 48 kb RAM.
One of its most "interesting" characteristics is its keyboard! Some keys have more than five (!) functions! It is impossible to type BASIC keywords letter by letter, instead you have to use function keys. A lot of peripherals and programs were developed for this computer. It seems that several models of this computers were launched (at least 3), but I've no technical details about them. It was replaced in 1984 by the Spectrum + and in 1985 by the Spectrum 128.
Alan Wilson reports to us :
The 16K version of the computer had only the 16K ram chips loaded, while the 48K version had both banks full.
To keep the prices down Sinclair used faulty 64K chips (internally 2 X 32K). All the chips in the 32K bank of RAM had to have the same half of the 64K chips working. A link was fitted on the pcb in order to choose the first half or the second half.
It was possible with a few logic chips for the experimenter to have access to the faulty 32K bank.
ciao Gianni sono interessato i gioiellini sono ancora disponibili? :)
Tuesday 3rd June 2014
regalo a chi ne farà richiesta zx Spectrum 48 con alimentatore originale più zx Spectrum + con tasti rigidi ed in oltre varie cassette con programmi. PS. spedizioni a carico destinatario.
Saturday 24th May 2014
My first computer was soviet-build clone of Spectrum 48K. I remember a lots of pirate audio-cassetes with cracked games from Poland (most popular string in loader was "Cracked by Bill Gilbert") 15-20 games on each. Whats a wonderful time!
Thursday 23rd January 2014
END OF PRODUCTION
BUILT IN LANGUAGE
QWERTY rubber keyboard (40 keys) with up to 6 functions by keys !
Zilog Z80 A
16k or 48k (42k left for programming)
16k (Basic & OS)
32 x 24
256 x 192
8 with two tones each (normal and bright)
1 voice / 10 octaves (Beeper)
SIZE / WEIGHT
23 x 14,4 x 3 cm / 550g
Expansion port, tape-recorder (1200 bauds), RF video out