Unofficial sequel to "Silkworm", a magnificent arcade in which a helicopter and a jeep confronted the enemies as a team, SWIV (Silkworm IV, Silkworm in Vertical or Special Weapons Interdiction Vehicles) changes the horizontal perspective by the vertical scroll, to continue providing hours of Fun massacring enemies.

Launched in 1991 with the 16-bit systems as the main objective, it was originally ported to Spectrum by the company that created them.

As on other occasions, the MSX version was commissioned by Dro Soft to a team of Spanish programmers, in this case Javier Fáfula and Gonzalo Suárez, who had specialized at that time in express conversions for MSX and PC.

The novelty of the matter, something that also occurred in some other case, was that Fáfula also converted the original Spectrum to Amstrad CPC, seeing this version of the light also outside our borders.

Both Spanish versions, as I say, are direct conversions of the Spectrum, with the limitations in the graphics that this entails. Even so, this should not prevent enjoying the action and fun of the game, although it is clear that it spoils a little.