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Figure I-1. TSB System Overview
THE SYSTEM OPERATOR The operator has the power, through Operator Commands, to modify the hardware configuration on-line, to enter, monitor and remove users of the TSB System, to supervise the mass storage and hardware status, and indirectly, to establish the System Library. The TSB System, without attendance, will log users on and off the system, receive and maintain their active BASIC programs, keep track of the time and mass storage used by each user, and maintain a personal library of BASIC programs for each user. REQUIRED MINIMUM CONFIGURATION The Time Shared Basic System operates on an HP2116B Computer with the following options: 2116B-05 16K Memory 2160A Power Supply 12578A Direct Memory Access 12579A Extended Arithmetic Unit 12588A Power Fail/Auto Restart 12591A Memory Parity Check The computer resides in a two-bay cabinet (HP2992Z) along with the following required devices: 2737A Photoreader 2754B ASR-35 Teleprinter 12532A Photoreader Interface 12531B Teleprinter Interface Disc Storage unit (see under Options for mass storage alternatives) 2770A-01 Disc option; non-expandable 6 megabit 2772A Disc Power Supply 12606A Disc Interface 12539A Time Base Generator 12584A-01 Teleprinter Multiplexor
The required hardware must be configured in the following way: I/O Channel Contents 108 Multiplexor 118 ASR-35 System Console 128 Time Base Generator 138 Photoreader 148-158 Disc (or other mass storage unit) OPTIONAL EXPANDED CONFIGURATIONS There are three classes of optional equipment that may be added to the Time Shared Basic System. Each provides a specific useful capability. An opera- tor command exists for each class which notifies the TSB System of the exist- ence of the option. (See Section IV.) Data Phones When the 12584A-02 Auto Disconnect option is plugged into any empty I/O channel of the computer and the TSB System is notified of its location (via the PHONES Command), the operator may connect a maximum of 16 Data Sets to the TSB System. Data Sets allow the user to connect to the TSB System over regular phone lines. Magnetic Tape Unit An HP 3030 or 7970 magnetic tape unit may be connected to the TSB System through any two adjacent free I/O channels. The TSB System will use the tape unit to dump a copy of the system whenever a SLEEP operation is executed.
Mass Storage Devices TSB System requires a minimum 64 or 48 track mass storage device, and is ex- pandable to 256 tracks. Each track contains between 90 and 128 sectors (64 16-bit words per sector), depending on the device. The first physical disc must be in locations 14-15, but subsequent discs may be in any pair of avail- able I/O locations. TSB System treats each 64 tracks as a logical disc unit; a device of 128 tracks would be logically treated as two discs of 64 tracks each. The first 64 tracks are called Disc-0. Be sure to check Section IV dealing with the DISC Command. This command notifies the TSB System that a mass storage de- vice is connected to the computer. The TSB will accept six different devices, three discs and three drums. Although a particular TSB System may mix discs and drums, they will all be treated logically as disc units. Throughout this book, any reference to discs will also refer to drums. Table I-1 lists the mass storage devices available. Since the drums are 48, 96, and 192 tracks each and TSB System is designed for discs of 64-track multiples, the operator must lock the missing tracks after entering the drum. (See Section IV.) Table I-1. Mass Storage Devices Device Type Sectors/Track # Tracks 2770A-01 disc 90 64 2771A disc 90 64 2711A-01 disc 90 128 2773A drum 128 48 2774A drum 128 96 2775A drum 128 192