Ports of Entry: Palace Software

Unknown lead platform:

 

The Evil Dead

Released for BBC Micro & Commodore 64 in 1984

Ported to ZX Spectrum in 1985 (exclusively bundled with Cauldron)

Mobygames credits suggest that the BBC Micro is Colin Tanner's original design and that the C64 version is a port by Richard Leinfellner. Wikipedia, however, says Leinfellner's C64 version is the original.

 

The Sacred Armour of Antiriad

Released for Amstrad CPC, Commodore 64, & ZX Spectrum in 1986

Released for Apple II in 1987

 

Dragon Lord

Released for Amiga & Atari ST in 1990

Ported to PC in 1990

 

Select chronology:   

 

Title	Lead platform	Date	Contemporary ports
Valkyrie 17	ZX Spectrum	1984
The Evil Dead	???	1984	Same-year releases on BBC Micro & C64 1985 port to ZX Spectrum
Cauldron	Commodore 64	1985-4	Same-year ports to Amstrad CPC & ZX Spectrum
The Sacred Armour of Antiriad	???	1986	Same-year releases on Amstrad CPC, C64, & ZX Spectrum 1987 release on Apple II
Barbarian: The Ultimate Warrior	Commodore 64	1987	Too many to list here
Barbarian II: The Dungeon of Drax	Commodore 64	1988	Too many to list here
Dragon Lord	???	1990	Same-year releases on Amiga & Atari ST Same-year port to PC