Arioso Macintosh IO Systems Architecture 1.0

Macintosh 1/0 Systems Architecture version 1.0 1/29/92 Henry Kannapell Scott Sarnikowski Architectural lnvestigations & Modeling Functional Technologies Contents Preface ·About this Document 1 lntroduction to Arioso / 1 - 1 2 ADB -Apple Desktop Bus / 2 - 1 3 Floppy / 3 - 1 ·=·==t~th. 4 LocalTalk / 4 - 1 5 Architectural Investigations & Modeling -Arioso ©1991 S® Apple Computer Confidential - Need to Know Atioso Rcv 1.0- lfl.9/92 Preface - About this Document This document contains a description and discussion of the Arioso model ofseveral Macintosh 10 subsystems. The Arioso model is intended to be a conceptual model ofIO subsystems that helps to· improve the portabilityof low-level VO software from one platfonn to another. :i~lilililil !~ ;1!il!l l l i~1~/ „/[]~/ ·41~.il. ~.i·:;~.·:_.·:a') i:_:,,_::1.: .. ::1.::..:.:.:[l..=.·..=':!:·!:..:!:!:··::i:_:'.·:;·:·:·:··::.:.::;::··.·:':.. :.: .·=.:·:. ..···:...·=:· . . .= .....:·::·.:··:·..:.•:..::......:·:.:::· ~'4! ii Architectural Inve.stigations & Modeling -Arioso ©1991 ti@ Apple Computer Confidential - Need to Know jJ Arioso Rev 1.0 - l/29ß2 What's in this Document? This document describes the important features and concepts of the Aioso VO model for Macintosh computers. This document contains the following material: • Chapter 1, "Introduction to Ariso" provides an ovelView of the Arioso model and discusses the motivation behind the Arioso Model. lt also includes a descrlption ofa new set for diagramming symlx>ls that capture the complexity of real-time algoritms. • Chapter 2, "ADB -Apple Desktop B1:l§" docum~A!$. the Arioso model for the ADB. • G.Mpter 6, "SG$.f.EßmiltlM@.mpijf:i.fS}'stems Interface" documents the Arioso model for SCSI. : :::::::~;~,\\~?::::hFlop~YO~rem ;h~ !!!~!t!::~:~::::~:r:;;:b~:~remcan srandabne. So, ü you arej@n!y inter~ted ir{SÖil read only chapter 6. In order to get a backgound an the Arioso ß.q\~l, make sure thaFyou read Chapter 1 prior to reading any of the later chapters. :=·=·====~tlt~=: ....•h :_~. ;:·1~._ :,r' ;~ ':·.1:;:,_:;;_::.:::_=·•·.:·.=··.=•.:::·,_·:.,.:·:_.:·_ .. ::.. .. ('C:J,/ •.. Architectural Investigations & Modeling -Arioso ©1991 S® Apple Computer Confidential - Need to Know üi Arioso Rcv 1.0 - 1/29192 e ~w" ~1 . :•.:.:';: •.: :;····:,.:_i·_;_ 4tf ~1t ~ : ~ . · _ = 1 . : = ~ : ' . . : i . 1 · ~ f~il::*f~fl; ( _ · . : ·..: ;:.:;.:·.:;.::::_:!_::!·' : ' .0•• '.!'!:;,._.;·::=·:·.:::·.:.:·.=·._.=.·:„:·. :.·_. . . Architectural Investigations & Modeling -Ariooo ©1991 ti@ Apple Computer Confidential-Need to Know ....... ARIOSO Chapter 1. Introduction to Arioso Henry Kannapell & Scott Sarnikowski About This Chapter chapter presents an introduction :tArio4.:lr the Macintosh Device System Tue Arioso This qf IO model is loosely based on the OSI UJ.,. sW~@fyirlgl~i&.9.tJftajor layers for each 10 device type. :~~~:~~~:~~:r:.;B!!:~~~~~~::i:~~a:~~~wswith each ®:W. ~chineJt1n~.Ne~1K~metMU{fac OS will soon represent …