For telecommunications use: Can use included GeoPort 33.6 modem (speeds may vary).

Hard Drive use: Cannot use the Apple's HD20!! Stock Twentieth Anniversary Macintosh can use any SCSI hard drive (25 pin port on back). SCSI only.

PCI slot - handles up to 7" PCI 2.0 card.

DAV slot - Used in conjunction with some ISDN and video editing PCI cards. Ribbon cable is used.

Apple official specs

System

• Introduced: 6/1/1997
• Discontinued: n/a - un-officially in 1998
• Floppy Size: 1.44MB (manual)
• Internal HD: 2GB (internal) ATA
• Internal CD: 4x Speed, Internal CD Support Yes, CD-ROM drive is mounted vertically on front of system.
• Upgrade From: None
• Upgrade To: None
• Form Factor: Twentieth Anniversary
• Weight: 14.9 lbs.
• Dimensions (in): 17.25 H x 16.5 W x 10 D
• Size and weight only represent main unit. Bass unit weighs 10.5 lbs and measures 10.63" x 8.31" x 11.75"
• Gestalt ID: 512

Logic Board

• Main Processor: 250 MHz PowerPC 603e with integrated math coprocessor and 32K on-chip cache; 256K level 2 cache
• PMMU: integrated
• FPU: integrated
• Data Path: 64, 50
• L1 Cache: 32K
• L2 Cache: 256K
• 2nd Processor: none
• Slots: 1 PCI, Comm II
• System Bus: 50 Mhz

Memory

• Logic Board: none
• RAM Slots: 2, 168-pin DIMM
• Min - Max RAM: 32 MB - 128 MB
• Min RAM Speed: 60
• RAM Sizes: 4, 8, 16, 32, 64 MB
• Install in Groups of: 1

Video

• Built-in Display: 12.1" color Active Matrix LCD
• Resolution /Video Memory 2MB SGRAM (built in)
  512 x 384 / n/a-bit
  640 x 400 / n/a-bit
  640 x 480 / 16-bit *
  800 x 600 / 16-bit *
  832 x 624 / n/a-bit
  1024 x 768 / n/a-bit
  1152 x 870 / n/a-bit
  1280 x 1024 / n/a-bit
• ATI Rage II 64-bit 3D Multimedia Video Card

Sound

• Bose Acoustimass sound system includes integrated stereo speakers and floor-standing bass unit.

Ports

• ADB: 1
• Video: none
• Floppy: none
• SCSI: DB-25
• Geoports: 2
• Ethernet: none
• FireWire:
• Mic Type: PlainTalk
• AirPort Ready:
• Other Ports: Printer
• Modem
• Speaker
• Headphone
• Remote Control infrared sensor
• Security lock port
• Integrated Apple TV/FM Radio System - Video capture 320x240 at 30fps. Coax connectors.
• Video input port
• Built-in S-video input
• Adapter cable for composite video
• Audio In through Stereo RCA jack (for video)
• 1/8" Audio in/out jacks

Power

• Max Watts: 140
• Amps:
• BTU per Hr: 478.8
• Voltage: 90-130/180-264
• Freq Range: 47-63 Hz
• Battery Type: 4.5V alkaline
• Soft Power: yes

Software

• Addressing Modes: 32-bit
• Orig SSW: 7.6.1
• Orig Enabler: System Enabler 704
• ROM ID: $077D
• ROM Ver: $35
• ROM Size: 4MB
• AppleTalk Ver: 60.1.1
• Mac OS Supported: 7.6.1, 8.0, 8.1, 8.5, 8.6, 9
  
  All technical information from www.apple.com