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.
Hello - my first ZX Spectrum was a self-made which means, all of the functions of the ULA were substituted with logic chips from the 74-series. The first version didn''t have a coloured version, just black/white. Later, a piggy-back board was made. After reunification of Germany, I bought a used ZX Spectrum and added the following modules - Betadisc Interface, 2 Floppy Disk Drives attached - Printer Interface - Kempston Joystick Interface To attach all these modules at once, I also had to make a bus extender with industrial connectors. The power was supplied by an PC power module, so I had enough 5V / 12V / -12V . It was a quite funny system and I was surprised how you can easily program with that machine even all key have multiple meanings depends on situation and keys pressed.
Monday 11th December 2017
Hello! Does anyone know where I can get games and apps for this computer? Because on google a results are about emulated games and apps. But I need a copy of cassette sound. Please help! Thank you!
Sunday 12th February 2017
I had a spectrum +2 when I was a kid, however I bought a zx spectrum 48K last week off an auction site. I seem to be able to get better reliablity with loading using an old tape player on the 48k than I ever did on my +2. I''m impressed that even being over 30 years old it still works.
Friday 19th June 2015
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