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betajet
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CEO
Rememberance of Things Past
betajet   7/4/2013 2:18:54 PM
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anon1428013:

You clearly missed out on the PDP-11 era, and you have my condolences.  The PDP-11 was IMO the finest of the mini-computers, and I was sad when memory got so cheap that the PDP-11's 16-bit addressing range (w/o segmentation) made it obsolete.  PDP-11 was an elegant, very regular architecture that was so simple that PDP-11 ASM programming was often easier than with the high-level languages of the time (this was before Pascal and C).  The machine language had such a simple octal coding that many ASM programmers could instantly decode instructions from an octal dump.

And I/O!  PDP-11 had very simple memory-mapped I/O.  How simple?  If you have an extra 10 minutes, go to the IT library, take out the "PDP-11 Peripherals Handbook" and read the chapter called "Programming".  It will show you how to do both busy-wait and interrupt-driven programming, in JUST 8 PAGES.  Compare that to what it takes to write a device driver for your favorite OS.

Looking at PDP-11 books reminds people like me of the wonderful time between the aloofness of mainframes locked away in glass rooms and the insane overcomplexity of modern desktop computers.  The PDP-11 was simple enough that an individual could quickly master it without being bogged down in arbitrary complexity.  It was a great time of freedom -- a machine you could fully control before being handcuffed by DRMs and software patents.

You can still get a PDP-11 style joy of simplicity with bare-metal programming on some embedded processors.

prabhakar_deosthali
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CEO
The computer that no more exists
prabhakar_deosthali   7/4/2013 8:41:02 AM
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The Digital Equipment Corporation , the well known name in computers for decades is history now. So much so that today's generation will hardly have heard this name.

 

But my IT department's library has a complete rack assigned for the books , manuals of DEC PDP 11 series computer and the associated RSX-11 operating system. It competes for space among the latest additions on HTML, XNL, JAVA and such new additions.

The veterans in our department refuse to dump those obsolete manuals !

kfield
User Rank
Blogger
A family heirloom
kfield   7/3/2013 5:03:27 PM
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I've always loved this desk plaque that was originally my father-in-laws, who started out in engineering in the 1950s. It is a treasured item that will be passed down through generations of "pack rats" in the family!

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