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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Psion Series 3mx

Psion Series 3mx

The Psion Series 3mx was the last model in the Series 3 line, launched in mid 1998, and is an upgrad to the Series 3c. The main differences are: a silver metallic finish, a CR2025 backup battery, and a faster processor, the 16 bit NEC V30MX (80C86 compatible) running at 27.684 MHz. It has a backlight like the later models of the Series 3c.

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Psion Series 3c

Psion Series 3c portable computer

The Psion Series 3c followed on from the Psion Series 3a and predating the Series 3mx. The main differences are: a redigned case in black with a rubberised coating (that degarded into a sticky mess over time), an infrared port, and a backlight (on later models).

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Tandy WP-3 Word Processor

The Tandy WP-3 is a portable Word Processor from the lates 1980s, early 1990s, a successor to the Tandy WP-2 but with a British English dictionary. Based on the Z-80 compatible NEC 70008A-6 it had a 6 line LCD display and a very usable full-size keyboard. Powered by 6V main supply and/or 4 x AA battries with backup from a CR2340 cell.

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Psion Series 3mx SSD door microswitch repair

I recently bought a Psion Series 3mx on eBay but found it didn’t recognise SSDs inserted in either A or B slots and suspected a motherboard fault. Having found a cheap 3mx to test this, and checking that it did indeed read SSDs OK, after swapping the motherboard it didn’t help. Not only that but it also failed in the same back in the original machine.

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