Ubi Soft, 1986, 1988, 1990
One of Ubisoft's (née Ubi-Soft) first games, Zombi, was an unlicensed adaptation of George A. Romero's 1978 film, Dawn of the Dead, going so far as to share the film's Italian title.
Originally released in 1986 on the Amstrad CPC, Zombi is a first-person, flick screen action-adventure game, and is absolutely a proto-survival horror game. Combat against zombies and a hostile gang is real-time.
Arriving on the roof of a shopping mall in a helicopter that's now out of fuel, you control Alexandre, Sylvie, Yannick and Patrick (named after the dev team).
Every member of the party can and must be controlled individually to allow you to survive long enough to collect fuel and get back to the copter.
Collectible objects are marked blue in the CGA DOS version of 1988, which wisely uses a monochrome palette with coloured highlights. Controls in this version are keyboard-based, and involve using the arrow keys to navigate around an icon bar and on-screen hotspots. This can get a little tense during real-time action sequences.
Download the EN/FR DOS version from Abandonware France – just unpack and run the COM file with DOSBox-X (or your own preferred DOSBox fork).
I actually recommend playing one of the other versions – my personal favourite is the Amiga edition, which gives you the luxury of point and click mouse controls, colour graphics, improved sound and very on-point music.
You can find it at MyAbandonware – this download is EN only. Unpack until you find an ADF file and play using FS-UAE.
The franchise was unexpectedly (kind of, ish) raised from the dead in the form of 2012's ZombiU for WiiU, later ported to Windows, PS4, and Xbox One under the title of Zombi.
Lemon Amiga Walkthu – English: https://www.lemonamiga.com/games/docs.php?id=1851
Dokokade Walkthru – French: https://jeux.dokokade.net/2017/01/18/soluce-retrocompatible-zombi-amstrad-et-amiga/