Radius System 100

The System 100 was the first authorized Macintosh clone. It was built around a slightly modified Power Mac 8100 motherboard: Radius used a standard Mac DA-15 video port instead of the 8100’s 45-pin AV port.

Radius Mac cloneThe Radius Mac clones were probably the most heavy of the bunch, clad in thick metal to provide more RFI shielding than Apple’s Macs.


  • 80 MHz, 48 MB RAM, 500 MB and 2 GB hard drives, FWB Hammer SCSI-2 card, Radius Thunder IV GX 1600 video card
  • 110 MHz, 72 MB RAM, 2 GB hard drives, FWB Hammer SCSI-2 card, Radius Thunder IV GX 1600 video card


  • introduced 1995.03.27; discontinued 1996.01.01
  • requires System 7.1 to 9.1, excluding 7.5.2
  • CPU: 80 or 110 MHz PowerPC 601
  • Bus: 40 or 37 MHz
  • ROM: 4 MB
  • RAM: 8 MB on motherboard, expandable to 264 MB using 8 SIMM sockets, supports 4, 8, 16, and 32 MB 72-pin 80ns SIMMs, SIMMs must be installed in matching pairs
  • Video, onboard: 1 MB VRAM on motherboard
  • Video port: Mac DA-15
  • Video, NuBus: Radius Thunder IV GX 1600 accelerated video card supports 640 x 480, 832 x 624, 1024 x 768, 1152 x 870, 1360 x 1024, and 1600 x 1200 at 24-bits
  • L2 cache: 256 KB, fixed
  • Hard drive: 500 MB or 2 GB SCSI drive
  • CD-ROM: 2x or 4x, requires CD-ROM Toolkit or other non-Apple drivers
  • Internal and external SCSI-2
  • ADB: 2 ports for keyboard and mouse
  • two miniDIN-8 GeoPorts on back of computer
  • DB-25 SCSI connector on back of computer with SCSI-1 support
  • NuBus slots: 3 (one used for video, one for SCSI-2 card, so only 1 available)
  • PDS slots: 1
  • Ethernet: built-in AAUI connector
  • size (HxWxD): unknown
  • Weight: unknown

Accelerators & Upgrades

  • none known

Online Resources


  • You cannot upgrade from Mac OS 9.0 to 9.1 using updaters on NuBus models. You must use a full installation CD for OS 9.1.
  • To boot from CD-ROM, start the computer while holding down the command, option, shift, and delete keys. This will bypass the internal hard disk drive and boot from the CD-ROM. (Due to a firmware change from Sony, the Sony CD drive in some systems are not bootable. Drives with ROM version 1.1a and 1.1b will not boot from CD Disk.)
  • If your monitor isn’t syncing to video, hold the T key while restarting. Release the key when things sync properly.

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