Macintosh Hardware Overview Feb91

MACINTOSH HARDWARE OVERVIEW Rev 2.0 ·February 11, 1991 ./ John Atwood (rev 1, 2) Andy Poggio (rev 1) Archltectural Investigations & Modeling Functional Technology Group, Macintosh Products Apple Computer Inc. 20705 Valley Green Dr. M-S 60AR Cupertino, CA 95014 9 Apple Registered Confidential 9 Macintosh Hardware Overview February 11, 1991 TABLE OF CONTENTS 1. 2. 3. 4. 5. 6. 7. 7. 8. 9. 10. 11. 12. 13. 14. INTRODUCTION ................................................................................. 3 PROCESSOR ....................................................................................... 11 MEMORY ............................................................................................ 18 . SYSTIM EXPANSION ........................................................................ 29 ADVANCED I/O ARCHITECfURE .................................................... 33 GRAPHICS .......................................................................................... 37 VIDEO OVERIAY ................................... ~ .......................................... 40 SOUND ............................................................................................... 44 MASS STORAGE ................................................................................ 49 NE1WORKING & COMMUNICATIONS ............................................ 53 SYSTEM SUPPORT FUNCTIONS ...................................................... 58 POWER .......... ........................................... 61 APPE IX 2 - VIA BITS ........ ...... .......... ..................................... 63 . APPE IX A W, E B CK D .G S .............. 67 BIBLI s Apple Registered Confidential 2 Macintosh Hardware Overview February 11, 1991 1. INTRODUCTION This document is a summary of the Apple Macintosh CPU hardware capabilities and constraints. It can serve multiple purposes, including establishing a baseline Macintosh architecture, and to provide new hardware and software engineers at Apple a hardware review of the Macintosh. In a sense, this serves a similar purpose as the Macintosh Family Hardware Reference and the Inside Macintosh series. However, this is an Apple internal document, and thus can include proprietary information and make references to internal specifications. The common hardware features of the Macintosh are doqimented, as well as major differen~es. To keep the document small, details are left to ERSs or specifications, which are referenced in the text. Since this document is being updated within a fixed schedule, not all areas have been given equal coverage. A goal is to continue updating this, so that after several revisions, all areas are well-covered. Your feedback, both in correcting errors, and in suggesting areas to emphasize, will be very h e quali Special notes or warning tha..L-&Hee--E~ew the Mac are highlighted. This document contains highly confidential material, and should be treated with the utmost care. Do not make copies of…