There were two versions of the Neptune arm: Neptune 1 and Neptune 2. Judging by the specification sheets and the one visual reference I've found, it seems that Neptune 1 was a de-rated version of Neptune 2, with one less axis of movement at the wrist and 8-bit rather than 12-bit control signals (hence lower positional and repeat accuracy). Neptune was developed around 1984, with control software offered initially for three 8-bit micros: the BBC micro, Sinclair Spectrum and Commodore VIC 20. Later promotional material (around 1986) mentions only software for the BBC, Apple II and IBM PC.
Neptune was offered in both kit form and fully assembled. Prices (ex. VAT) in March 1985 ranged from £1550 for a basic Neptune 1 in kit form, up to £3364 for a fully assembled Neptune 2 with hydraulic power pack, miniature simulator arm and ADC.
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