CPU: Z80 @ 3.5 MHz MEMORY: 16 KB / 48 KB / 128 KB GRAPHICS: Video output is through an RF modulator and was designed for use with contemporary portable television sets, for a simple colour graphic display. Features a palette of 15 shades: seven colours at two levels of brightness each, plus black. The image resolution is 256x192 with the same colour limitations. SOUND: Early models (48k) had sound output through a beeper on the machine itself. This is capable of producing one channel with 10 octaves. Late models (128k) fetured a three-channel audio via the AY-3-8912 chip, MIDI compatibility MEDIA/STORAGE: 16/48k (external), 128k (internal) tape recorder, 128k 3" floppy built-in
The ZX Spectrum is an 8-bit personal home computer released in the United Kingdom in 1982 by Sinclair Research Ltd. Referred to during development as the ZX81 Colour and ZX82, the machine was launched as the ZX Spectrum by Sinclair to highlight the machine's colour display, compared with the black-and-white of its predecessor, the Sinclair ZX81. The Spectrum was released in eight different models, ranging from the entry level model with 16 KB RAM released in 1982 to the ZX Spectrum +3 with 128 KB RAM and built in floppy disk drive in 1987 The original ZX Spectrum is remembered for its rubber keyboard, diminutive size and distinctive rainbow motif. It was originally released in 1982 with 16 KB of RAM or with 48 KB. Two years later on 1984 the ZX Spectrum+ released with no significant changes in the hardware, but only on the system casing. Sinclair then developed the ZX Spectrum 128 in conjunction with their Spanish distributor Investrónica. New features included 128 KB RAM, three-channel audio via the AY-3-8912 chip, MIDI compatibility, an RS-232 serial port, an RGB monitor port, 32 KB of ROM including an improved BASIC editor, and an external keypad. On 1986 the ZX Spectrum +2 was Amstrad's first Spectrum, coming shortly after their purchase of the Spectrum range and "Sinclair" brand in 1986. The machine featured an all-new grey case featuring a spring-loaded keyboard, dual joystick ports, and a built-in cassette recorder dubbed the "Datacorder" (like the Amstrad CPC 464), but was in most respects identical to the ZX Spectrum 128. A year later the ZX Spectrum +3 released and looked similar to the +2 but featured a built-in 3-inch floppy disk drive (like the Amstrad CPC 6128) instead of the tape drive, and was in a black case. It was launched in 1987, was the only Spectrum capable of running the CP/M operating system without additional hardware.