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Dec PDP 1 |
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1959 |
Caractéristiques techniques du PDP-1 |
Processeur 18 bits Mémoire : 4096 mots de 18 bits Entrée sortie de données : écran / clavier / cartes perforées Options : stylo optique, écran haute résolution, bandes magnétiques Logiciels fournis : Editeur, Assembleur et Debuggeur Prix : 120000 $ |
INTRODUCTION The Programmed Data Processor (PDP-1) is a high speed, solid state digital computer designed to operate with many types of input-output devices with no internal machine changes. It is a single address, single instruction, stored program computer with powerful program features. Five-megacycle circuits, a magnetic core memory and fully parallel processing make possible a computation rate of 100,000 additions per second. The PDP-1 is unusually versatile. It is easy to install, operate and maintain. Conventional 110-volt power is used, neither air conditioning nor floor reinforcement is necessary, and preventive maintenance is provided for by built-in marginal checking circuits. PDP-1 circuits are based on the designs of DEC's highly successful and reliable System Modules. Flip-flops and most switches use saturating transistors. Primary active elements are Micro-Alloy-Diffused transistors. The entire computer occupies only 17 square feet of floor space. It consists of four equipment frames, one of which is used as the operating station. CENTRAL PROCESSOR The Central Processor contains the control, arithmetic and memory addressing elements, and the memory buffer register. The word length is 18 binary digits. Instructions are performed in multiples of the memory cycle time of five microseconds. Add, subtract, deposit, and load, for example, are two-cycle instructions requiring 10 microseconds. Multiplication requires and average of 20 microseconds. Program features include: single address instructions, multiple step indirect addressing and logical arithmetic commands. Console features include: flip-flop indicators grouped for convenient octal reading, six program flags for automatic setting and computer sensing, and six sense switches for manual setting and computer sensing. MEMORY SYSTEM The coincident-current, magnetic core memory of a standard PDP-1 holds 4096 words of 18 bits each. Memory capacity may be readily expanded, in increments of 4096 words, to a maximum of 65,536 words. The read-rewrite time of the memory is five microseconds, the basic computer rate. Driving currents are automatically adjusted to compensate for temperature variations between 50 and 110 degrees Fahrenheit. The core memory storage may be supplemented by up to 24 magnetic tape transports. INPUT-OUTPUT PDP-1 is designed to operate a variety of buffered input-output devices. Standard equipment consistes of a perforated tape reader with a read speed of 400 lines per second, and alphanumeric typewriter for on-line operation in both input and output, and a perforated tape punch (alphanumeric or binary) with a speed of 63 lines per second. A variety of optional equipment is available, including the following: Precision CRT Display Type 30 Ultra-Precision CRT Display Type 31 Symbol Generator Type 33 Light Pen Type 32 Oscilloscope Display Type 34 Card Punch Control Type 40-1 Card Reader and Control Type 421 Magnetic Tape Transport Type 50 Programmed Magnetic Tape Control Type 51 Automatic Magnetic Tape Control Type 52 Automatic Magnetic Tape Control Type 510 Parallel Drum Type 23 Automatic Line Printer and Control Type 64 18-bit Real Time Clock 18-bit Output Relay Buffer Type 140 Multiplexed A-D Converter Type 138/139 All in-out operations are performed through the In-Out Register or through the high speed input-output channels. The PDP-1 is also available with the optional Sequence Break System. This is a multi-channel priority interrupt feature which permits concurrent operation of several in-out devices. A one-channel Sequence Break System is included in the standard PDP-1. Optional Sequence Break Systems consist of 16, 32, 64, 128, and 256 channels. |