File:PDP-8 s (2682618330).jpg
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| Description | This PDP-8/s is at the Computer History Museum in Mountain View CA. The PDP-8/s was the first computer to be available for less than $10,000 US. It was also the first to be sold off-the-shelf. It was popular for its time because of the low price. 1024 units were made. The "s" in the name stands for serial, although some said it stands for "slow". To economize on gates and transistors, all arithmetic operations were performed serial-by-bit. The PDP-8 is a 12-bit word-length machine, so to add two 12-bit numbers, they were cycled through a 1-bit adder, and added 1 bit at a time. The machine was constructed using modular "Flip-chip" plug-ins. Many of the plug-in modules were interchangeable -- thus a module from the program counter could also be used in the accumulator. One common module contained two flip-flops (4 transistors), thus functioned as two bits in a register. The front panel displayed pretty much the entire state of the machine. The far right column of lights showed the phase of instruction execution. The next column of lights from the right shows the current instruction opcode (all eight of them!). This computer featured 4K words of core memory. |
| Date | |
| Source | PDP-8/s |
| Author | ajmexico from Melbourne, USA |
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by ajmexico at https://flickr.com/photos/15587432@N02/2682618330. It was reviewed on 15 May 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 09:29, 15 May 2021 | | 2,968 × 1,950 (1.16 MB) | Sentinel user (talk | contribs) | Transferred from Flickr via #flickr2commons |
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