Appendix D. Cabling rules for systems with a migration unit or the 9079 and 9094 expansion unit

If you already have a migration unit or a 9079 Expansion Unit set up on your system, there are special cabling rules that you must follow. On the table below, find your system unit and follow the rule that apply to your system unit.

System unit

Rule

 

 

 

iSeries 820

v

A 503x migration unit must be in the first position of the HSL

 

 

loop if there are a total of three external units or fewer. The

 

 

first position is the position that is closest to connector A0 on

 

 

the system unit. See Figure 31 on page 46 and Figure 32 on

 

 

page 46.

 

v If there are four or five external units, the 503x must be in the

 

 

second position of the HSL loop. There must be one

 

 

expansion unit between A0 and the 503x. See Figure 33 on

 

 

page 47 and Figure 34 on page 47.

 

v

The 5079 counts as two independent 5074s. If you have two

 

 

5079s and one 503x, follow the cabling diagram that is shown

 

 

in Figure 35 on page 47.

 

v The 503x must be in the last position of the SPCN loop. See

 

 

Figure 36 on page 48.

 

 

 

iSeries 830

v

You cannot install a 5074 or 5079 on the same HSL loop as the

 

 

503x or 5077 migration unit. Use the next available HSL

 

 

connector.

 

v The 503x must be in the last position of the SPCN loop. See

 

 

Figure 36 on page 48.

 

v

Set up the SPCN cable for your 5074 in the same SPCN loop

 

 

as the 5077.

 

 

This is true even though you are connecting the 5074 to a

 

 

different HSL loop than the 5077.

 

 

You can do this by connecting the SPCN cable from J15 of

 

 

your new expansion unit to J16 of the 5077.

 

 

See Figure 37 on page 48.

 

 

 

iSeries 840

v

You cannot install a 5074 or 5079 to the same HSL loop as the

 

 

5077.

 

v You can install up to two 5074s or one 5079 with a 9079 on

 

 

the first loop (A0 and A1).

 

v Set up the SPCN cable for your 5074 or 5079 in the same

 

 

SPCN loop as the 5077 or 9079.

 

 

This is true even though you are connecting the 5074 or 5079

 

 

to a different HSL loop than the 5077 or 9079.

 

 

You can do this by connecting the SPCN cable from J15 of

 

 

your new expansion unit to J16 of the 5077 or 9079.

 

 

See Figure 37 on page 48.

 

 

 

© Copyright IBM Corp. 2000, 2002

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IBM 5079, 578, 5078, 5074 manual System unit Rule
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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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