Med Mac Proposal

Macintosh' 2 aka Little Big Mac, Medium Mac Design Proposal Michael Dhuey 6 -7 - 85 " The Macintosh 2 is designed to combine the Macintosh software base with the expandability of an Apple lie. The machine is divided into two parts: the lower box with CPU, slots, disk drives, and memory; and the upper box with power supply and video. The lower box has the following components: * * * 16 MHz 68000 CPU. 1 Mbyte of RAM, expandible to 2 Mbyte. Four general purpose slots with 32 bits address and 32 bits data defined and all control lines neccessary for bus mastership (e.g. 68020 or 80286 ) * * * Room for two double sided Sony 3 112" drives. * Small Computer Standard Interface (SCSI) port to connect external hard disks, tape drives, and printers. * * Two serial ports with synchronous modem support signals. Room for one half height 5 114" SCSI compatible hard disk. DMA support for SCSI hard disk, serial port, Macintosh sound, and memory refresh. Memory Map to protect applications in a "Switcher" program and to support Unix operating system. * Front Desk Bus to allow various keyboard, mouse, joystick, etc. options. * * 256 Kbytes of high speed ROM. Built in video circuit for 640 x 480 B&W one bit per pixel video. Seperate video RAM to avoid processor contention for ~ RAM * Soft power control to allow software to save machine state before power-off. * Real Time Clock with 10 year battery backup. Apple Confidential Macintosh 2 Proposal Page Back 1!2 Height 5 1!4"'Hard Disk 2 Sided Sony 2 Sided Sony 2 Power! Serial SCSI Video .. I I I Top View Back View The upper box has the following components: * 12" diagonal B&W video using Flat / Square CRT (normal CRT is more curved on face). * "Square" pixels 640 W x 480 H at physical 76 pixels/inch and logical 72 pixels/inch (Same denisty as Macintosh). * Universal power supply which accepts 85 to 280 volts AC without a switch. * Flicker-free video with 68 Hz refresh (normal is 60 Hz) on P4 phospher (used in B&W TV). 12" Side View Front View Apple Confidential Macintosh 2 Proposal Page 2 FF FFFF -SF FFFF F7 FFFF FO 0000 Unused EF FFFF Ell 0000 E7 FFFF AO 0000 'OF FFFF Physical Address and Protection of Logical Pages EO 0000 DF FFFF 08 0000 D7 FFFF VIA (6522) DMA (68450) IWM SCSI (5380) sec (8530) C8 0000 07 FFFF co 0000 3F FFFF Future EXp. DO 0000 CF FFFF 80 0000 Interrupt Vector 8 Slots 64KB each 7F FFFF Unused Unused 62 0000 ~1 FFFF 20 0000 60 0000 1F FFFF 5F FFFF 44 0000 'Logical RAM Address Space Unused 43 FFFF Physical ROM 40 ,0000 00- 0000 Apple Confidential Video Macintosh 2 Proposal Page 3 x Options/Issues (7/3/85 - Bill Watson, Peter Friedman) What are tradeoffs re: customer benefit, costs, schedule, risk and manufacturability? Option Issue 4 Slots or 6? Expandability Box size Power requirements Video card? Slot power Regulated vs. unregulated (burden on Apple or 3rd parties?) Slot defintion VM E or other? Video …