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The contents of the IBM AP-101 page were
merged into
IBM System/4 Pi. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see
its talk page. (2 December 2016)
In the intro it is stated the computer doesn't really share System/360 architecture, while in the rest of the article it is stated it does. Since the former statement is unsourced and the others are properly referenced, I'd say proper 360 heritage is more likely... --
Arny (
talk)
09:00, 23 August 2017 (UTC)reply
@
Arny: I'm not sure that all members of the 4Pi series are 360 derived. The early Model EP is described in 1967 as using "an instruction subset of the IBM System/360" but the TC and CP models are not.
[1] The AP-101 was an improved version of the AP-1 which was derived from the EP which was based on the 360.
"The 4Pi AP-1's advantages lay in its history and architecture. Already used in aircraft applications, it was also related to the 4Pi computers on Skylab, which were members of the same architectural family as the IBM System 360 mainframe series. Since the instruction set for the AP-1 and 360 were very similar, experienced 360 programmers would need little retraining." and "The AP-101 has the same type of registers and architecture used in the IBM System 360 and throughout the 4Pi series." Computers in Spaceflight: The NASA Experience by James E. Tomayko, March 1988. NASA Contractor Report 182505.
NASA used IBM 360/75 mainframes that were "compatible" with the AP101 as a development environment. These had specialized interfaces to connect to flight hardware. It is very likely that these may have needed custom user writable microcode to emulate the flight computer. I have not been able to locate a reference that describes this in detail.
Even for these later models it unclear to me how similar these really are to the 360. The AP-101S can be configured for either the IBM Multipurpose Midline Processor (MMP)
ISA (the only mode in the Shuttle AP-101B) or
MIL-STD-1750A (used in some USAF aircraft.) Depending on which of the modes it is operating in the computer might function more or less like a 360. --
mikeutalk20:26, 12 December 2017 (UTC)reply
Does that mode configuration correspond to distinct microprogrammable instruction sets ? What can we say about the different microprograms ? -
Rod57 (
talk)
20:00, 24 November 2018 (UTC)reply
Text about AP existed before adding the references (AP is a later model), I think it could be moved to Models if it's not too long, because there is even more models (ML-1, CC-1/2, SP-1 and possibly others):
[2] (table lower parts: search "Logic 5 Gates" and "Price/Performance"),
[3],
[4]
Related to ML-1, but requires buying/subscription:
[5], direct link:
[6]
This article is within the scope of WikiProject Computing, a collaborative effort to improve the coverage of
computers,
computing, and
information technology on Wikipedia. If you would like to participate, please visit the project page, where you can join
the discussion and see a list of open tasks.ComputingWikipedia:WikiProject ComputingTemplate:WikiProject ComputingComputing articles
This article has been
automatically rated by a
bot or other tool because one or more other projects use this class. Please ensure the assessment is correct before removing the |auto= parameter.
This article is within the scope of the Military history WikiProject. If you would like to participate, please visit the project page, where you can join the project and see a
list of open tasks. To use this banner, please see the
full instructions.Military historyWikipedia:WikiProject Military historyTemplate:WikiProject Military historymilitary history articles
This article is within the scope of the
Aviation WikiProject. If you would like to participate, please visit the project page, where you can join the project and see lists of
open tasks and
task forces. To use this banner, please see the
full instructions.AviationWikipedia:WikiProject AviationTemplate:WikiProject Aviationaviation articles
The contents of the IBM AP-101 page were
merged into
IBM System/4 Pi. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see
its talk page. (2 December 2016)
In the intro it is stated the computer doesn't really share System/360 architecture, while in the rest of the article it is stated it does. Since the former statement is unsourced and the others are properly referenced, I'd say proper 360 heritage is more likely... --
Arny (
talk)
09:00, 23 August 2017 (UTC)reply
@
Arny: I'm not sure that all members of the 4Pi series are 360 derived. The early Model EP is described in 1967 as using "an instruction subset of the IBM System/360" but the TC and CP models are not.
[1] The AP-101 was an improved version of the AP-1 which was derived from the EP which was based on the 360.
"The 4Pi AP-1's advantages lay in its history and architecture. Already used in aircraft applications, it was also related to the 4Pi computers on Skylab, which were members of the same architectural family as the IBM System 360 mainframe series. Since the instruction set for the AP-1 and 360 were very similar, experienced 360 programmers would need little retraining." and "The AP-101 has the same type of registers and architecture used in the IBM System 360 and throughout the 4Pi series." Computers in Spaceflight: The NASA Experience by James E. Tomayko, March 1988. NASA Contractor Report 182505.
NASA used IBM 360/75 mainframes that were "compatible" with the AP101 as a development environment. These had specialized interfaces to connect to flight hardware. It is very likely that these may have needed custom user writable microcode to emulate the flight computer. I have not been able to locate a reference that describes this in detail.
Even for these later models it unclear to me how similar these really are to the 360. The AP-101S can be configured for either the IBM Multipurpose Midline Processor (MMP)
ISA (the only mode in the Shuttle AP-101B) or
MIL-STD-1750A (used in some USAF aircraft.) Depending on which of the modes it is operating in the computer might function more or less like a 360. --
mikeutalk20:26, 12 December 2017 (UTC)reply
Does that mode configuration correspond to distinct microprogrammable instruction sets ? What can we say about the different microprograms ? -
Rod57 (
talk)
20:00, 24 November 2018 (UTC)reply
Text about AP existed before adding the references (AP is a later model), I think it could be moved to Models if it's not too long, because there is even more models (ML-1, CC-1/2, SP-1 and possibly others):
[2] (table lower parts: search "Logic 5 Gates" and "Price/Performance"),
[3],
[4]
Related to ML-1, but requires buying/subscription:
[5], direct link:
[6]