

                              S-100

 Popula OE bus

 Mos variet o microprocesso implementations

 IEE standard

 Extremel wel define an eas t conform

 N chang i ou hardwar designs

 Onl on Unisof UNI port

 Mos popula multi-processo environment

 Goo DM devic support

 2 bi addressin (fit wel wit 68 devices)

 Difficul t coo becaus o onboar regulator althoug thes 
  reduc tota syste noise.

 Mos compac bu (althoug thi limit layouts)

 Ove 5 boar manufacturers

 Popula iternationally

 Wides variet o device supported

 Highes incompatabilit facto du t olde no-standar 
  designs

 N chi manufacture suppor (o competition)

 Probabl 500,00 unit i fiel (Microsystem estimate)

 Magazin support

 Designer an technica staf shortages

 Easies t implemen variou processors

 N roo fo 3 bit

 Mos operatin systems CP/M MP/M OASIS IDRIS UNIX 
   TURBODOS CPM68K CPM86 MPM816 CONCURREN CPM86 MSDOS  
   SYSTEM FORTH NDOS CDOS



                            MULTIBUS

  Mos popula OE bus

  Full regulate supplies

  Mos popula 6800 an 6801 bus

  1603 implementation

  Popula mult-processo environment

  Secon mos popula 808 bus

  Large layou are (hold abou 30 mor chips

  Easie t cool

  N roo fo 3 bit

  Wid variet o device supported
    1 SM an hig performanc dis controllers
    2 Tap controllers
    3 EC memor (u t  Mbyte)
    4 Hig capacit vide boards
    5 Etherne controllers
     Smar SAS controllers
    7 I circui emulator an debuggers


 Designer an technica peopl mos availabl o busses

* Roughl sam cos a S-10 whe regulator ar considered
  possibl 15 mor becaus o siz an fingers

 Eas an chea solutio t  Unisof UNI port

 IEEE-79 standar bu som vagarie exis i implementations

 Easies bu t migrat fro S-100



.pa
                               VME

 Tru 3 bi bu 

 Internationa "Eurocard for facto (doubl an triple)

 Popula wit 6800 an 68010

 NS 1603 implementation

 Mor expensiv tha multibus

 N IEE standar  supporte b Motorola Signetic an 
  Phillips

 No  lo o device supporte  mostl fo on supplie 
  systems

 Timin no wel specifie an no easil adapte t 808 type
  processors.

 Har t mov ou design to



                               DEC

 Wel defined

 Popula wit OEM

 Ver difficul t mov ou design to

 Paten o backplan b DEC

 Wel establishe market

 Multitud o device supported

 Othe tha DEì fe other micro-processo implementations

 N IEE standard

 Expensive



.pa
                            Versabus


 Man 6800 implemetations

 Larg boar (mor expensive)

 N IEE standard

 Majo suppor b Motorol an smal OEMs

 Fe system an devices

 I circui emulator an devlopemen systems

 Largel replace b VM includin VME




                             P BUS


 N IEE standard

 No wel defined

 N DM o sophisicate interrup structure

 Limite boar capacity

 Multipl vendor an device support

  Mbyt addres limited

  bi dat pat only n 1 bi o 3 bi data

 Difficul fo othe tha 808 

 Severel limite fo ou muli user/processo architecture

 Difficul UNI port

 Mos popula bu (now)

 Magazin support

 Ove 10 manufacturer (accordin t BYTE)

 th board an planne 
 retur tri t updat thei boards I th meantim the c