Texas Instruments TI99/4a

The Texas Instruments TI-99/4A followed the TI99/4, which was let down by a poor keyboard, and was released in 1981. Based on the TMS9900 microprocessor, the TI99/4 was the first 16-bit home computer.

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Psion Organiser II

Psion Organiser II LZ64

The Organiser II was launched in 1986 to follow the original Organiser from 1984. It had a better keyboard and display and a much larger ROM. There were three models (CM, XP and LZ) with between 8 and 64KiB RAM and a new single-tasking operating system

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Hewlett Packard HP 95LX

The HP 95LX was launched on April 23, 1991 before the term personal digital assistant, or PDA, found its way into everyday use putting the power of a computer into the palm of your hand. It ran MS-DOS v3.22 in 512K bytes of RAM and 1M-byte ROM and had a QWERTY keyboard and a separate…

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Sinclair ZX Spectrum 48K

Sinclair ZX Spectrum 48K boxed

The much anticipated successor to the ZX81, the ZX Spectrum was originally released with options for 16K or 48K RAM. The 16K Spectrums were upgradable to 48K. It was recognisable by its distinctive rubber key keyboard and it sported rainbow stripes to indicate the introduction of colour, where the ZX80 and ZX81 were purely monochrome.

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Sinclair ZX81

Sinclair ZX81

The ZX81 was the successor to the ZX80, still based on the Zilog Z80A but with 8K ROM rather than 4K, and the same 1K RAM. The biggest technical difference was the integration of many of the ICs into one component, which reduced the chip count and the cost, starting at £49.95 for a kit, and £69.95 for a ready-built machine.

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