Difference between revisions of "PDP-1"
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| − | + | {{Infobox Machine | |
| + | | name = PDP-1 | ||
| + | | manufacturer = [[Digital Equipment Corporation]] | ||
| + | | year first shipped = 1960 | ||
| + | | form factor = small computer | ||
| + | | word size = 18 bits | ||
| + | | physical address = 16 bits (64K words) | ||
| + | | virtual address = 12 bits | ||
| + | | logic type = micro-alloy diffused [[transistor]] [[System Module]]s | ||
| + | | design type = | ||
| + | <!-- | clock speed = μsec (basic instructions) --> | ||
| + | | memory speed = 5 μsec (read/write [[cycle time]]) | ||
| + | | successor = [[PDP-4]] | ||
| + | | price = US$120K (4KW system) | ||
| + | }} | ||
| − | {{stub}} | + | The '''PDP-1''' was the first computer built by [[Digital Equipment Corporation]]. It was an 18-bit machine; a [[load-store architecture]], with a single [[accumulator]]. Around 50 were built. |
| + | |||
| + | The basic PDP-1 included 4KW of [[core memory|core]] [[main memory]]; an optional Type 15 Memory Extension Control allowed (via [[bank switching]]) the addition of up to fifteen additional 4KW Type 12 Core Memory Modules, for a maximum total of 64KW. | ||
| + | |||
| + | The later optional Type 10 Automatic Multiply and Divide added [[instruction]]s to perform multiplication and division at high speed in hardware (previously, they had been done in software [[subroutine]]s, albeit with support from specialized instructions). | ||
| + | |||
| + | Standard peripherals included a [[paper tape]] reader and punch, and a [[terminal]]. Optional peripherals included [[graphics]] [[display]]s, a [[light pen]], [[line printer]], [[punched card]] reader and punch, and [[magnetic tape]] [[device controller|controller]] and [[magnetic tape drive|drives]]. <!-- Two different [[magnetic storage|magnetic]] [[drum]] [[secondary storage]] systems (xx) --> | ||
| + | |||
| + | A PDP-1 at [[Massachusetts Institute of Technology|MIT]]'s [[Research Laboratory of Electronics|RLE]] served as the nucleus for early [[hacker]] culture at MIT. | ||
| + | |||
| + | ==Technical details== | ||
| + | |||
| + | The instruction format consisted of a 5-bit basic operation code, a 1-bit indirect address bit, and a 12-bit memory address. If the indirect address bit was set in the indirect word, the indirection process repeated. <!-- The augmented instructions all share an operation code. In them, the address field is not used for an address; instead, each bit of the field can specify a separate operation, and generally more than one bit can be set at a time (except for most of the [[skip]] operations). --> The [[Program Counter]] is also 12 bits long. | ||
| + | |||
| + | The PDP-1 used [[one's complement]] arithmetic. | ||
| + | |||
| + | They were built out of DEC's [[System Module|System Building Blocks]] | ||
| + | |||
| + | {{semi-stub}} | ||
==External links== | ==External links== | ||
| − | * [http://www.bitsavers.org/pdf/dec/pdp1 PDP-1] | + | * [http://www.bitsavers.org/pdf/dec/pdp1 PDP-1] - Original PDP-1 documents at [[Bitsavers]] |
| + | * [http://www.bitsavers.org/pdf/mit/rle_pdp1/ MIT-RLE PDP-1] - material at Bitsavers | ||
* [https://www.computerhistory.org/pdp-1/_media/pdf/DEC.pdp_1.102664938.pdf PDP-1 and PDP-3 brochure] | * [https://www.computerhistory.org/pdp-1/_media/pdf/DEC.pdp_1.102664938.pdf PDP-1 and PDP-3 brochure] | ||
| + | * [https://www.computerhistory.org/pdp-1/_media/pdf/DEC.pdp_1.pulse_height_anlayzer.1963.102664958.pdf A time-shared computer for real-time information processing], 1963 | ||
| + | * [https://gordonbell.azurewebsites.net/Digital/PDP%201%20Manual%201960.pdf PDP-1 Manual, 1960] | ||
| + | * [https://gordonbell.azurewebsites.net/Digital/PDP%201%20Manual%201961.pdf PDP-1 Manual, 1961] | ||
| + | * [https://gordonbell.azurewebsites.net/Digital/F25_PDP1_IO.pdf PDP-1 Manual for I/O] (F-25) | ||
| + | * [https://www.computerhistory.org/pdp-1/ PDP-1 Restoration Project] - at the [[Computer History Museum|CHM]] | ||
| + | ** [https://www.computerhistory.org/pdp-1/origins-of-the-pdp-1/ Origins of the PDP-1] | ||
| + | ** [https://www.computerhistory.org/pdp-1/restoration/ Restoration] | ||
| + | * C. Gordon Bell, Gerald Butler, Robert Gray, John E. Mcnamara, Donald Vonada, and Ronald Wilson, [http://gordonbell.azurewebsites.net/Computer_Engineering/00000145.htm The PDP-1 and Other 18-Bit Computers], in C. Gordon Bell, J. Craig Mudge, John. E. McNamara, ''Computer Engineering: A DEC View of Hardware Systems Design'', Digital Press, Bedford, 1978 | ||
| + | |||
| + | {{Nav DEC}} | ||
[[Category: DEC Systems]] | [[Category: DEC Systems]] | ||
| + | [[Category: 18-bit Computers]] | ||
Latest revision as of 23:18, 27 February 2024
| PDP-1 | |
| Manufacturer: | Digital Equipment Corporation |
|---|---|
| Year First Shipped: | 1960 |
| Form Factor: | small computer |
| Word Size: | 18 bits |
| Logic Type: | micro-alloy diffused transistor System Modules |
| Memory Speed: | 5 μsec (read/write cycle time) |
| Physical Address Size: | 16 bits (64K words) |
| Virtual Address Size: | 12 bits |
| Successor(s): | PDP-4 |
| Price: | US$120K (4KW system) |
The PDP-1 was the first computer built by Digital Equipment Corporation. It was an 18-bit machine; a load-store architecture, with a single accumulator. Around 50 were built.
The basic PDP-1 included 4KW of core main memory; an optional Type 15 Memory Extension Control allowed (via bank switching) the addition of up to fifteen additional 4KW Type 12 Core Memory Modules, for a maximum total of 64KW.
The later optional Type 10 Automatic Multiply and Divide added instructions to perform multiplication and division at high speed in hardware (previously, they had been done in software subroutines, albeit with support from specialized instructions).
Standard peripherals included a paper tape reader and punch, and a terminal. Optional peripherals included graphics displays, a light pen, line printer, punched card reader and punch, and magnetic tape controller and drives.
A PDP-1 at MIT's RLE served as the nucleus for early hacker culture at MIT.
Technical details
The instruction format consisted of a 5-bit basic operation code, a 1-bit indirect address bit, and a 12-bit memory address. If the indirect address bit was set in the indirect word, the indirection process repeated. The Program Counter is also 12 bits long.
The PDP-1 used one's complement arithmetic.
They were built out of DEC's System Building Blocks
External links
- PDP-1 - Original PDP-1 documents at Bitsavers
- MIT-RLE PDP-1 - material at Bitsavers
- PDP-1 and PDP-3 brochure
- A time-shared computer for real-time information processing, 1963
- PDP-1 Manual, 1960
- PDP-1 Manual, 1961
- PDP-1 Manual for I/O (F-25)
- PDP-1 Restoration Project - at the CHM
- C. Gordon Bell, Gerald Butler, Robert Gray, John E. Mcnamara, Donald Vonada, and Ronald Wilson, The PDP-1 and Other 18-Bit Computers, in C. Gordon Bell, J. Craig Mudge, John. E. McNamara, Computer Engineering: A DEC View of Hardware Systems Design, Digital Press, Bedford, 1978
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