Commodore VIC-20 PR Software Lot Strategy Simulation Games CONVOY- STAR DEFENDER

Lot of 4 very scarce P.R. Software Commodore Vic-20 titles that are strategy/simulation style games like the old mainframe tactical-grid war games. PR Software was a small company that specialized in this genre, was based out of South San Francisco andpublished cassette and disk computer games for VIC-20 as well as TRS-80, Apple II, and Atari. They advertised and sold mostly through mail order magazine ads, selling a few hundred units per release at most. These are from 1982 made by Peter Russo.
Cassette tapes are original and come with the original folded instructions and baggies, tape contents are untested. Hopefully they work because doubtful any soft copies exist online!
VIC-20 CONVOY ESCORT (2 copies) & VIC-20 CONVOY RAIDER - The player relies on simulating sonar sweeps, tracking periscope sightings, and firing torpedoes on a naval coordinate matrix. It is a high-stakes game of hide-and-seek on the ocean.
VIC-20 STAR DEFENDER - You are tasked with protecting a set of solar systems from an incoming alien invasion force. Instead of hunting a hidden enemy, you are managing a spreading layout of grid coordinates, trying to intercept known invasion trajectories across multiple sectors.