General information
Postal is a 3D shooter with mainly isometric, but also some top-down levels featuring hand-painted backgrounds. Gameplay and interface are similar to first-person shooters of the time in most, but not on all counts:
•\tMovement is always relative to the orientation of the player character ("The Postal Dude"). The player therefore must always be aware of the direction the character is facing, which can be difficult on the isometric maps.
•\tThere are eight weapon slots, each with a fixed amount of maximum ammo. The default weapon is a weak machine gun with unlimited ammo.
•\tContrary to first-person shooters, however, the goal is not just to stay alive and reach the next level, but to kill a given percentage of the armed NPCs on the map. Only then the exit to the next level is activated.
There is no plot as such. The presence of a moving van on the first level suggests that the Postal Dude has been evicted from his home and is therefore "going postal", but no background story evolves during the game.
An add-on to the game called Special Delivery was made in 1998 which featured four new levels (department store, shanty town, earthquake zone and vacation resort), new characters, new sounds, new modes of play (co-op and a refined deathmatch). Original and add-on were released together as Postal Plus in 2001 and ported to Linux by Loki Software.

•\tPentium 90MHz
•\t16 MB RAM
•\t2X CD-ROM drive
•\t256 Color SVGA 640x480
•\t16-bit Audio Card (Sound Blaster 16 or 100% Compatible)

•\tPentium 166MHz
•\t32 MB RAM
•\t4× CD-ROM drive
•\t256 Color SVGA (640x480)
•\t16-bit Audio Card (Sound Blaster 16 or 100% Compatible)


As stated on the official Postal Plus help file.

•\t133 MHz or higher CPU
•\t16 MB or more of RAM
•\t24 MB or more of available hard drive space.
•\tAny Video Card (with at least 256 colors at 640×480 resolution)
•\t16-bit Audio Card (Sound Blaster 16 or 100% Compatible)


•\t300 MHz or higher CPU
•\t64 MB or more of RAM
•\t24 MB or more of available hard drive space.
•\tAny Video Card (with at least 256 colors at 640×480 resolution)
•\t16-bit Audio Card (Sound Blaster 16 or 100% Compatible)


•\tPowerPC 601
•\t16MB RAM
•\t2X CD-ROM drive

http://www.indowebster.com/Postal_1_Plus.html