Connecting your 5079 to another expansion unit

This section contains instructions for connecting your 5079 expansion unit to a loop with other expansion units. You can only connect your 5079 with other expansion units that have HSL hardware.

Your 5079 consists of two independent 5074 Expansion Units in a single frame. These procedures refer to the upper 5074 as 5079–002and the lower 5074 as 5079–001.

Notes:

1.The graphics that follow designate the HSL connectors for the system unit as 0 and 1. These designations represent which set of connectors on your system unit the HSL loop is connected to (for example B0 and B1).

2.These procedures are intended as a guide. Some steps in the following procedures may vary depending on the number of HSL connectors you received in your order. Make sure that you follow the configurations rules in Table 4 on page 5.

This section contains three separate procedures. Follow the procedure that best matches your system’s configuration:

v“Connecting your 5079 at the beginning of a loop”.

v“Connecting your 5079 in the middle of a loop” on page 24.

v“Connecting your 5079 to the end of a loop” on page 25.

Connecting your 5079 at the beginning of a loop

Use this procedure to connect your 5079 in the first position in a loop of expansion units. In this procedure you will connect your 5079 between your system unit and the expansion unit which is currently in the first position.

These instructions refer to the expansion unit which is currently in the first position as unit X as is shown in Figure 14 and Figure 15 on page 23.

Figure 14. HSL connections

22Setting up your 0578, 5074, 5078 or 5079 Expansion Unit V5R2

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IBM 578, 5078, 5074 manual Connecting your 5079 to another expansion unit, Connecting your 5079 at the beginning of a loop
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5078, 5079, 578, 5074 specifications

The IBM 5074, 578, 5079, and 5078 are part of IBM's influential line of midrange computer systems that emerged during the late 1970s and early 1980s. These models were pivotal in the evolution of business computing at a time when companies were increasingly adopting automated systems for data processing tasks.

The IBM 5074, also known as the IBM 5100 Series, was particularly notable for being one of the first portable computers, offering a versatile computing environment for both technical and business applications. It featured an impressive combination of hardware and software capabilities, including a built-in keyboard, a screen, and the ability to run various programming languages. Both APL and BASIC were readily available, making it a popular choice for developers and mathematicians alike.

The 578 model was an advanced variant of the 5074, emphasizing enhanced performance and expanded memory capacity. The 578 integrated more sophisticated I/O capabilities, which included diverse connection options for external devices. This system was geared toward small and medium enterprises requiring robust computing power without the complexities of mainframe management.

The IBM 5079, on the other hand, distinguished itself with its unique multi-user capabilities, allowing for simultaneous access by multiple users. This built-in support for multitasking made it a formidable tool in office environments where collaboration and efficient resource sharing were paramount. Its operating system was designed to optimize performance across various applications, facilitating smoother operations in busy work environments.

Lastly, the IBM 5078 served as a bridge between traditional minicomputers and the growing demand for microcomputing solutions. It included critical innovations in processing speed and data handling capabilities, allowing businesses to better manage their operations. With a focus on reliability and uptime, the 5078 was engineered for critical business functions that demanded robust performance in a pragmatic package.

Together, these models underscored IBM's commitment to innovation and adaptability in the computing landscape of the late 20th century. They set the groundwork for future advancements in personal computing and enterprise systems, influencing generations of technology that followed. Their legacy is a testament to the evolution of computing technology, showcasing concrete advancements in capability, efficiency, and user accessibility.
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