By Anita K. Jones

ISBN-10: 0123894506

ISBN-13: 9780123894502

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Additional info for Perspectives on Computer Science. From the 10th Anniversary Symposium at the Computer Science Department, Carnegie-Mellon University

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P M S structure of 1 1 / 4 5 . 27 What Have We Learned from the PDP-11? D (Floating Point Processor) ï c Κ (Mem. ) Mp.. IT J Γ" K(map) I Κ(#Ί4)- Massbus 32 bit Fig. 6. P M S s t r u c t u r e of 11 / 7 0 . that a processor could access fast local memory. The original design never anticipated the availability of large fast semiconductor memories. In the past, high-performance machines have parlayed modest gains in component technology into substantially more performance by making architectural changes based on the new component technologies.

Total-system cost, assuming one-third of system is Pc cost. PriceVperf. KMs.. C. Gordon Bell 36 The second type of structure given in Fig. 8 is a conventional multiprocessor using multiple-port memories. A number of these systems have been installed, and they operate quite effectively. However, they have only been used for specialized applications. mmp, is amply described in the literature [Wulf et al. 72]. As it becomes a user machine, we will gather data about its effectiveness. Hopefully, data from this and other multiprocessor efforts will establish multiprocessors as applicable and useful in a wide variety of situations.

It includes the smallest and largest (except the 11 /70) models. Note 29 What Have We Learned from the PDP-11? PC A ALU SHFMUX PC Β AMUX BMUX U ConstantsT I^ Floating point processor Scratch pad memory Scratch pad memory SRMUX DRMUX S register D register Β register Solid state memory Β register A IR Processor status BRMUX Read only memory Past IR Stack limit Branch Processor status Fig. 7c. Control buffer Address buffer P D P - 1 1 / 4 5 block d i a g r a m . that the 11 /45 block diagram does not include the floating-point operations, but does show the path to fast local memory.

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Perspectives on Computer Science. From the 10th Anniversary Symposium at the Computer Science Department, Carnegie-Mellon University by Anita K. Jones


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