Established in 1987 by John Prince and Donald Campbell, Tiertex specialised in the development of 8- and 16-bit coin-op conversions [e.g. STREET FIGHTER (Amiga), 720° (Spectrum), 1943: THE BATTLE OF MIDWAY (C64)]. In the early 1990s they branched out and began developing for the consoles and PC, which they continued to do until the mid/late 90s when their focus changed to handheld consoles such as Game Boy Color and GBA. Currently, Tiertex is still owned and directed by Donald Campbell, and now develop mobile and handheld console games.
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Grandslam / Grand Slam
Grand Slam Entertainment(s) Ltd. / Grandslam Entertainment(s) Ltd. / Grandslam Video Ltd.
Formed in late 1987 out of the ashes of Argus Press Software by ex-Argus Managing Director Stephen Hall. Receivers were called in by the firm's bank, Barclays, in 1990 after amassing a large debt and bankruptcy looked imminent, but somehow foreclosure was averted.