Honeywell acquired the line when it purchased GE's computer division in 1970 and continued to develop them under a variety of names for many years.

In 1989, Honeywell sold its computer division to the French company Groupe Bull who continued to market compatible machines.

[1] The models with an even number as the next-to-last digit of the model number included an Enhanced Instruction Set feature (EIS), which added decimal arithmetic and storage-to-storage operations to the original word-oriented architecture.

[2] In 1973, Honeywell introduced the 6180, a 6000-series machine with addressing modifications to support the Multics operating system.

[3] In 1975, the 6000-series systems were renamed as Level 66, which were slightly faster (to 1.2 MIPS) and offered larger memories.

Devices called Input/Output Multiplexers (IOMs) served as intelligent I/O controllers for communication with most peripherals.

The IOM was passed the contents of the BAR for each I/O request, allowing it to use virtual rather than physical addresses.

The older DATANET-30 and the DATANET 305— intended for smaller systems with up to twelve terminals attached to an IOM.

[8] The DATANET 355 processor attached directly to the system controller in a memory module and was capable of supporting up to 200 terminals.