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start [2015/11/07 14:16]
scott
start [2019/02/03 12:38] (current)
scott [Burroughs B2500/B3500]
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 In 1956 the Burroughs corporation entered the business computer market by purchasing the Electrodata  corporation.   The Pasadena plant, while marketing and selling the Electrodata 200 and 300-series systems (now as the Burroughs B2x0/B3x0), began development of the B5000 series and the B2500/B3500 series computer systems. In 1956 the Burroughs corporation entered the business computer market by purchasing the Electrodata  corporation.   The Pasadena plant, while marketing and selling the Electrodata 200 and 300-series systems (now as the Burroughs B2x0/B3x0), began development of the B5000 series and the B2500/B3500 series computer systems.
  
-The B2500/B3500 was announced in March, 1966, __Designed with the explicit idea of being the target of a COBOL compiler.__ (Quoting Dave Dahm).  The systems were rented for between USD4500 and USD20,000 per month.    Shipping began 1Q67.  Magnetic core memory of 10000 bytes to 150,000 bytes was available with a 2 microsecond cycle time on the B2500 and a 1 microsecond cycle type on the B3500 for each two bytes accessed.   Estimated performance was 1.5 times the IBM 360/30. A B3500 could be configured with from one to twenty I/O channels.   The processor included what today would be called **cache memory** with an access time of 150ns.  Called **address memory**, it started at 24 16-bit words and could be expanded to 120 16-bit words.+The [[:b2500_b3500|B2500/B3500]] was announced in March, 1966, __Designed with the explicit idea of being the target of a COBOL compiler.__ (Quoting Dave Dahm).  The systems were rented for between USD4500 and USD20,000 per month.    Shipping began 1Q67.  Magnetic core memory of 10000 bytes to 150,000 bytes was available with a 2 microsecond cycle time on the B2500 and a 1 microsecond cycle type on the B3500 for each two bytes accessed.   Estimated performance was 1.5 times the IBM 360/30. A B3500 could be configured with from one to twenty I/O channels.   The processor included what today would be called **cache memory** with an access time of 150ns.  Called **address memory**, it started at 24 16-bit words and could be expanded to 120 16-bit words.
  
 The central processors incorporated extremely fast read-only storage.  This storage device is wired with interpretive routines which are executed with a 50 nanosecond cycle time.  These routines are called microprograms.   The great advantage of microprograms is that various different routines may be wired in, allowing the //emulation// of other systems.   This same technique was used by IBM in achieving compatibility between System/360 and the 1400/7000 series computers.   Burroughs used this emulation technique to emulate its own 200 and 300 systems as well as the IBM 1401 series machines. The central processors incorporated extremely fast read-only storage.  This storage device is wired with interpretive routines which are executed with a 50 nanosecond cycle time.  These routines are called microprograms.   The great advantage of microprograms is that various different routines may be wired in, allowing the //emulation// of other systems.   This same technique was used by IBM in achieving compatibility between System/360 and the 1400/7000 series computers.   Burroughs used this emulation technique to emulate its own 200 and 300 systems as well as the IBM 1401 series machines.
start.1446934562.txt.gz ยท Last modified: 2015/11/07 14:16 by scott
 
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