Cisco PIX

Cisco - Cisco PIX Firewall Release Notes, Version 6.3(5)
Cisco - Upgrade Software for PIX 500 Security Appliance 6.x to 7.x

The Cisco PIX 500 Series Security Appliances has been retired and is no longer supported.
    End-of-Sale Date: 2008-07-28
    End-of-Support Date: 2013-07-29 

Source: Cisco - Cisco PIX 500 Series Security Appliances - Retirement Notification

Cisco Community - PIX 515 Memory Question
Cisco - Configuring the PIX Firewall and VPN Clients Using PPTP, MPPE and IPSec

By clabretro on YouTube:

• Early 2000s Networking with Cisco PIX on 2023-12-30.
• Cisco PIX Device Manager: Enterprise GUIs Episode 1 on 2024-04-07. Uses a Noctua NF-A6x25 FLX 60x25mm Premium Fan to repace the PIX 515E onboard fan.
• Gaming on a 25 year old Cisco firewall on 2024-08-31. Uses a PIX 520.

YouTube - THE UNTOLD STORY: How the PIX Firewall and NAT Saved the Internet on 2023-06-03 by The Serial Port.