Difference between revisions of "PDP-11/15"

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[[Category:UNIBUS processors]]
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[[Image:pdp1115.jpg|250px|right|thumb|A PDP-11/15]]
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The '''PDP-11/15''' is the [[Original Equipment Manufacturer|OEM]] version of the [[PDP-11/20]]. Its [[hardware]] is not completely identical to the -11/20, though; its [[KC11 CPU]] is slightly different from the [[KA11 CPU]] of the -11/20 (although the KC11 contains mostly the same boards as the KA11).
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The KC11 only supports a single [[interrupt]] priority level (and thus has only a single interrupt [[bus grant line]] on its [[UNIBUS]]). It could be upgraded to the 4-level of the KA11 by the optional [[KF11-A]]. The KC11 also does not have [[power fail/restart]]; this could be added with the [[KP11-A]].
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The [[Central Processing Unit|CPU]] manual ("pdp11/20-15-r20 processor handbook") claims (pg. 137) that the KC11's [[KY11-A Programmer's Console]] [[front panel]] has only 16 address lights and switches, unlike the 18 of the KA11, but images of PDP-11/15 (above) show 18 locations for address lights (although it is possible that there are no actual lights behind the two left-most locations).
  
 
{{PDP-11}}
 
{{PDP-11}}
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[[Category: UNIBUS PDP-11s]]

Latest revision as of 14:17, 13 January 2020

A PDP-11/15

The PDP-11/15 is the OEM version of the PDP-11/20. Its hardware is not completely identical to the -11/20, though; its KC11 CPU is slightly different from the KA11 CPU of the -11/20 (although the KC11 contains mostly the same boards as the KA11).

The KC11 only supports a single interrupt priority level (and thus has only a single interrupt bus grant line on its UNIBUS). It could be upgraded to the 4-level of the KA11 by the optional KF11-A. The KC11 also does not have power fail/restart; this could be added with the KP11-A.

The CPU manual ("pdp11/20-15-r20 processor handbook") claims (pg. 137) that the KC11's KY11-A Programmer's Console front panel has only 16 address lights and switches, unlike the 18 of the KA11, but images of PDP-11/15 (above) show 18 locations for address lights (although it is possible that there are no actual lights behind the two left-most locations).