AOS/VS II
| Company type | Discontinued operating system |
|---|---|
| Industry | Computer software |
| Founded | 1988 |
| Founder | Data General |
| Products | Operating system for 32-bit MV/Eclipse computer series |
AOS/VS II represents a discontinued operating system created by Data General specifically for their 32-bit MV/Eclipse computer series.
Overview
Introduced in 1988, AOS/VS II was originally intended to be version 8.00 of the AOS/VS operating system. However, it incorporated a completely new and incompatible file system featuring capabilities such as Access control list (ACL) groups. Because many customers were hesitant to upgrade their hardware or adopt the new file system, Data General continued providing bug fixes for the original AOS/VS, referred to as AOS/VS “Classic,” while progressing development on AOS/VS II with versioning restarted at 1.00.
Updates addressing the Year 2000 problem were issued for both VS-Classic (revision 7.7x) and VS-II (revision 3.2x), although by that time, both systems were nearing obsolescence.
Significant improvements introduced in AOS/VS II encompassed a complete TCP/IP protocol stack, support for NFS, an enlarged kernel address space through ring-1 implementation, and a logical disk-level user data cache—enhancements over VS-Classic’s file system metadata cache, which did not include caching for user data.