Re: How secure *IS* your system
Ah yes - Amcom E-Net where you could gain admin access in 30 seconds by locking the workstation out and then jumping into the ‘failed login’ routine which decremented your 1 byte priority from 0 to 0xff (-1 or 255) which was admin level. Or issue read calls for sectors from the file server hard drive including those 4 char passwords, or read any other workstation’s screen or even reset them remotely.
After writing a basic disassembler in BASIC and then working through the printout it didn’t take too much to write a ‘sideways ROM’ to load into the temporary sideways RAM which intercepted the NMIs which then allowed total control over the network, blocking real admins access to your machine and reading any file on the entire network. Ahem. Speaking for a friend of course.