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🎄💾🗓️ Day 11: Retrocomputing Advent Calendar - The SEL 840A🎄💾🗓️
Systems Engineering Laboratories (SEL) introduced the SEL 840A in 1965. This is a deep cut folks, buckle in. It was designed as a high-performance, 24-bit general-purpose digital computer, particularly well-suited for scientific and industrial real-time applications.
Notable for using silicon monolithic integrated circuits and a modular architecture. Supported advanced computation with features like concurrent floating-point arithmetic via an optional Extended Arithmetic Unit (EAU), which allowed independent arithmetic processing in single or double precision. With a core memory cycle time of 1.75 microseconds and a capacity of up to 32,768 directly addressable words, the SEL 840A had impressive computational speed and versatility for its time.
Its instruction set covered arithmetic operations, branching, and program control. The computer had fairly robust I/O capabilities, supporting up to 128 input/output units and optional block transfer control for high-speed data movement. SEL 840A had real-time applications, such as data acquisition, industrial automation, and control systems, with features like multi-level priority interrupts and a real-time clock with millisecond resolution.
Software support included a FORTRAN IV compiler, mnemonic assembler, and a library of scientific subroutines, making it accessible for scientific and engineering use. The operator’s console provided immediate access to registers, control functions, and user interaction! Designed to be maintained, its modular design had serviceability you do often not see today, with swing-out circuit pages and accessible test points.
And here's a personal… personal computer history from Adafruit team member, Dan…
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The first computer I used was an SEL-840A, PDF:
I learned Fortran on it in eight grade, in 1970. It was at Oak Ridge National Laboratory, where my parents worked, and was used to take data from cyclotron experiments and perform calculations. I later patched the Fortran compiler on it to take single-quoted strings, like 'HELLO', in Fortran FORMAT statements, instead of having to use Hollerith counts, like 5HHELLO.
In 1971-1972, in high school, I used a PDP-10 (model KA10) timesharing system, run by BOCES LIRICS on Long Island, NY, while we were there for one year on an exchange.
Serial no. 01 175Consisting of CPU with table and control panel, tape control unit, Processor Bays 2 and 3, core memory unit MG10, RH10 data
This is the front panel of the actual computer I used. I worked at the computer center in the summer. I know the fellow in the picture: he was an older high school student at the time.
This DEC PDP-10 KA10 Control Panel was donated by Bruce Maier of Long Island New York. The recently retired Mr. Maier operated this early D
The first "personal" computers I used were Xerox Alto, Xerox Dorado, Xerox Dandelion (Xerox Star 8010), Apple Lisa, and Apple Mac, and an original IBM PC. Later I used DEC VAXstations.
Dan kinda wins the first computer contest if there was one… Have first computer memories? Post’em up in the comments, or post yours on socialz’ and tag them #firstcomputer #retrocomputing – See you back here tomorrow!
The Evolution of Power: From Room-Sized Giants to Galaxies in Our Hands 🚀
Look at this incredible transformation!
On the left: The behemoths of early computing—machines that filled entire rooms, needed teams to operate, and possessed less processing power than the phone in your pocket. These pioneers laid the entire foundation for the modern world.
On the right: Infinity in our palms. A device that connects us to the entire globe, maps the stars, and holds endless information.
Tech evolution isn't just about making things smaller; it's about making power accessible. It's the constant leap from the impossible to the indispensable.
What's the next monumental leap you think we'll see in tech? Drop your prediction in the comments! 👇
A Journey Through the History of Computing: From Ancient Times to Modern PioneersComputing, as we kn
A Journey Through the History of Computing: From Ancient Times to Modern Pioneers
Computing, as we know it today, is the result of centuries of intellectual development, but its history begins long before electronic computers and modern lines of code. The first traces of computation date back to the 10th century BC, when the Babylonians, and possibly even the Chinese and Indians, used rudimentary tools to perform arithmetic operations.
Memory Line is a short documentary film that reflects on the early days of computing and listens to computing veterans who remember their experiences of the memory machine, EDSAC. The work comprises interviews with three women who are veterans of EDSAC as they remember their time working with the machine and also includes interviews with a group of volunteers who are currently building a replica of EDSAC at The National Museum of Computing in Bletchley Park. They discuss the important role of women in early computing, and what makes them tick as pioneering computer programmers.On 6 May 1949 a team of engineers led by Sir Maurice Wilkes in the University of Cambridge Mathematical Laboratory ran the first programme on a new digital computer called the Electronic delay storage automatic calculator (EDSAC).EDSAC is one of the first digital computers ever built with a programmable memory that allowed it to store data. Using tubes of mercury, the computer stored bits of data by sending ultrasonic pulses through the tubes and creating a memory feedback loop. The computer’s memories were literally soundwaves.A team of retired computer engineers are currently building a replica of EDSAC (which was decommissioned 60 years ago in 1958) at The National Museum of Computing in Bletchley Park. The project has seen spare rooms, garden sheds, attics and kitchen tables converted into project and prototype laboratories across the region as the team build a machine which is an entire room in size, in their homes.
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A signed Apple 1 at the Computer History Museum in Mountain View, CA. #apple1 #valleyofsilicon #california #historyofcomputing (at Computer History Museum)
