The System 81/110 was Radius’ second Macintosh clone. It was built around a slightly modified Power Mac 8100 motherboard.

Like the System 100, the 81/110 was built like a tank with thick metal to provide substantial RFI shielding – and significant weight.

Details

• introduced 1995.07.24; discontinued 1996.01.01
• requires System 7.5.1 to 9.1, excluding 7.5.2
• CPU: 110 MHz 601
• Bus: 37 MHz
• 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: Mac DA-15
• VRAM: 1 MB
• L2 cache: 256 KB, fixed
• Hard drive: 800 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)
• PDS slots: 1
• Ethernet: built-in AAUI port
• size (HxWxD): unknown
• Weight: unknown

Accelerators & Upgrades

• none known

Online Resources

• Radius 81/110, Dr. Drang, 2012.01.22.
• Hacking Mac OS 7.6.1 so many Mac OS 8 apps will run, Max Wallgren, Mac Daniel, 2007.10.30. With a little ResEdit work and a second copy of your System Folder, you can run a lot of OS 8 apps with Mac OS 7.6.1.
• Mac System 7.5.5 Can Do Anything Mac OS 7.6.1 Can, Tyler Sable, Classic Restorations, 2007.06.04. Yes, it is possible to run Internet Explorer 5.1.7 and SoundJam with System 7.5.5. You just need to have all the updates – and make one modification for SoundJam.
• Appearance Manager Allows Internet Explorer 5.1.7 to Work with Mac OS 7.6.1, Max Wallgren, Mac Daniel, 2007.05.23. Want a fairly modern browser with an old, fast operating system? Mac OS 7.6.1 plus the Appearance Manager and Internet Explorer may be just what you want.
• Format Any Drive for Older Macs with Patched Apple Tools, Tyler Sable, Classic Restorations, 2007.04.25. Apple HD SC Setup and Drive Setup only work with Apple branded hard drives – until you apply the patches linked to this article.
• System 7 Today, advocates of Apple’s ‘orphan’ Mac OS 7.6.1, Tommy Thomas, Welcome to Macintosh, 2006.10.26. Why Mac OS 7.6.1 is far better for 68040 and PowerPC Macs than System 7.5.x.
• Setting up a NuBus Power Mac as a digital recording studio, Tyler Sable, Classic Restorations, 2006.05.08. Take a Power Mac 7100 or 8100, add a Digidesign AudioMedia II card and a fast hard drive, and you’ve got the core of a powerful, low-cost digital recording studio.
• System 7.6.1 is perfect for many older Macs, John Martorana, That Old Mac Magic, 2006.03.24. Want the best speed from your old Mac? System 7.6.1 can give you that with a fairly small memory footprint – also helpful on older Macs.
• Web browser tips for the classic Mac OS, Nathan Thompson, Embracing Obsolescence, 2006.01.03. Tips on getting the most out of WaMCom, Mozilla, Internet Explorer, iCab, Opera, and WannaBe using the classic Mac OS.
• The best browsers for PowerPC Macs and the classic Mac OS, Nathan Thompson, Embracing Obsolescence, 2005.12.16. Two browsers stand out from the pack: iCab 3 is modern and remains under development, and WaMCom brings Mozilla to older Macs.
• Radius Macintosh Clone, model 81/110, DigiBarn Computer Museum
• Radius 81/110 Speedup, Marc Schrier. Chipping may achieve speeds as high as 126 MHz.
• Radius System 81/110, EveryMac.com
• Radius System 81/110, MacintoshOS.com

Troubleshooting

• 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.
• 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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