The buyer, Honeywell, Inc., continued to support existing 500-series systems until 1984 but discontinued manufacturing.
The 550 and 560 include one or more "system control processors" (CPs) to handle interrupts, diagnostics, clocks, direct I/O, and operator communications.
[8] On the IBM 1130/1800 magnetic tape drives were only available as a special feature—RPQ (Request Price Quotation).
The systems are microprogrammed and constructed using large-scale and medium-scale integration (LSI and MSI) and magnetic-core memory.
[9] RBM supports a combination of real-time and general-purpose batch jobs running at the same time.
Much as IBM's Job Control Language statements begin with // (Slash-Slash), Xerox uses an exclamation point (!