Macintosh LC 575
a.k.a. Performa 575, 577, 578
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The LC 575 is essentially a Quadra 605 motherboard in an LC 520/550 case. It normally came with 5 MB RAM and a CD-ROM drive, but there was an LC 575 in a 4 MB configuration without a CD-ROM drive - available only in the education market.
- LC 575 introduced 1994.11.03 at $1,700; discontinued 1996.03.02
- Performa 575-578 introduced 1994.02.01 at $1,700; discontinued 1995.04
- requires System 7.1 (with Enabler 065) or later; highest version supported without a PPC upgrade is Mac OS 8.1.
- CPU: 33 MHz 68LC040
- FPU: requires replacing CPU with 68040
- performance: 10.0 (relative to SE); 8.85, MacBench 2.0 CPU; 29 MIPS
- ROM: 1 MB
- RAM: 4 MB on motherboard, expandable to 68 MB using a single 80ns 72-pin SIMM; can use 1 MB, 2 MB, 4 MB, 8 MB, 16 MB, 32 MB and 64 MB SIMMs. (The LC 575 works only with single-banked 64 MB SIMMs, but it does not work with double-banked 64 MB RAM SIMMs.
- video: 512 KB VRAM, expandable to 1 MB; supports 640 x 480 resolution
- L2 cache: optional, PDS
- Hard drive: 160-320 MB SCSI
- ADB: 2 ports for keyboard and mouse
- serial: 2 DIN-8 RS-422 ports on back of computer
- SCSI: DB-25 connector on back of computer
- hard drive: 250 MB
- one LC PDS slot
- size (HxWxD): 17.9" x 13.5" x 16.5"
- weight: 40.5 lb.
- PRAM battery: 4.5V alkaline
- Gestalt ID: 92
- addressing: 32-bit
- upgrade path: Power Mac PDS card
Accelerators & Upgrades
- PowerPC Processor Upgrades for LC PDS, Covers Apple, DayStar, and Sonnet PPC upgrades for LC 475, 575-580, 630, Performa 475-476, 575-588, 630 series, Quadra 605, and Quadra 630.
- L2 cache, various vendors, discontinued
- Low End Mac's best classic Mac OS deals. Best online prices for System 6, 7.1, 7.5.x, Mac OS 7.6, 8.0, 8.1, 8.5, 9.0, 9.2.2, and other versions.
- Environmentally responsible retirement for old Macs, Rick Lawson, Pioneers in Mac Development, 2008.06.13. After you've scavenged what useful parts you can from your old Mac, what's the most environmentally friendly way to dispose of the rest?
- Know your Mac's upgrade options, Phil Herlihy, The Usefulness Equation, 2008.08.26. Any Mac can be upgraded, but it's a question of what can be upgraded - RAM, hard drive, video, CPU - and how far it can be upgraded.
- Creating Classic Mac boot floppies in OS X, Paul Brierley, The 'Book Beat, 2008.08.07. Yes, it is possible to create a boot floppy for the Classic Mac OS using an OS X Mac that doesn't have Classic. Here's how.
- The compressed air keyboard repair, Charles Moore, Miscellaneous Ramblings, 2008.07.24. If your keyboard isn't working as well as it once did, blasting under the keys with compressed air may be the cure.
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- Vintage Mac networking and file exchange, Adam Rosen, Adam's Apple, 2007.12.19. How to network vintage Macs with modern Macs and tips on exchanging files using floppies, Zip disks, and other media.
- Getting inside vintage Macs and swapping out bad parts, Adam Rosen, Adam's Apple, 2007.12.14. When an old Mac dies, the best source of parts is usually another dead Mac with different failed parts.
- Solving Mac startup problems, Adam Rosen, Adam's Apple, 2007.12.12. When your old Mac won't boot, the most likely culprits are a dead PRAM battery or a failed (or failing) hard drive.
- Why you should partition your Mac's hard drive, Dan Knight, Mac Musings, 2008.12.11. "At the very least, it makes sense to have a second partition with a bootable version of the Mac OS, so if you have problems with your work partition, you can boot from the 'emergency' partition to run Disk Utility and other diagnostics."
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- iBook 'Road Apple' debate, new iMac looks horrible, Apple's new keyboards, and more, Dan Knight, Low End Mac Mailbag, 2007.08.08. Also how one user rescued a SCSI drive his Mac could no longer mount, troubleshooting an LC 575, and USB issues with the Beige G3.
- 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.
- The truth about CRTs and shock danger, Tom Lee, Online Tech Journal, 2007.05.22. You've been warned that CRT voltage can injure and even kill. The truth is that this danger is overstated - and takes attention away from a greater danger.
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- Making floppies and CDs for older Macs using modern Macs, Windows, and Linux PCs, Tyler Sable, Classic Restorations, 2007.03.15. Older Macs use HFS floppies and CDs. Here are the free resources you'll need to write floppies or CDs for vintage Macs using your modern computer.
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- 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.
- MpegDec: Play MP3s and streaming audio on 680x0 and old PowerPC Macs, Nathan Thompson, Embracing Obsolescence, 2006.03.14. 680x0 Macs can play anything short of 128kbps stereo MP3s, and even the oldest PowerPC Macs have no trouble at all with those recordings.
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- Which system software is best for my vintage Mac?, Tyler Sable, Classic Restorations, 2005.11.22. Which system software works best depends to a great extent on just which Mac you have and how much RAM is installed.
- Why you should use Mac OS 7.6 to get the most out of vintage Macs, Thomas Ahart, The Productive Mac, 2005.12.12. Although you may be able to run OS 8 or 9 on your old Mac, you'll generally find better performance using Mac OS 7.6.
- Guide to LC PDS Video Cards. Includes Focus, Radius, and RasterOps cards for the LC processor direct slot.
- Performa 575 to Power Mac 575, Steve Wood, View From the Classroom, 2/7.
- How Do I Set Up a 550 for the Net?, Mac Daniel
- How Do I Speed Up a 575?, Mac Daniel
- Should I Upgrade or Replace My Performa 575?, Mac Daniel
- 72-pin SIMM memory pricing, ramseeker
- Quadlist, the email list for 68040-based Macs
- Memory Upgrade Guide
- Macintosh LC 575 Technical Specifications, Apple Knowledge Base Archive
- Macintosh Performa 575 Technical Specifications, Apple Knowledge Base Archive
- Serial port normally restricted to 57.6 kbps; throughput with a 56k modem may be limited. See 56k modem page. For more information on Mac serial ports, read Macintosh Serial Throughput.
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