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Apple advises against booting from external storage containing a version of macOS earlier than the one your Mac shipped with.
MAC OS 7.6 BOOT FROM CD MAC OS
If you are using a version of Mac OS prior to this, you canĭownload the System 7.5 Network Access floppy disk and boot your Intel-based Mac Bootable optical media (CD or DVD) on Macs equipped with Apple’s Super Drive or a USB thumb drive formatted with a GUID partition type and containing a macOS installer or a usable operating system. Note that self-mounting Disk Images require Mac OS version 7.0.1 or On the first part to mount the compressed disk image on your desktop. Download all 19 parts to your hard drive and then double-click This software is available as 19 parts of a self-mounting Disk Copy /Apple_Support_Area/Apple_Software_Updates/English-North_American/Macintosh/System/System_7.5.5_Update/./Apple_Support_Area/Apple_Software_Updates/English-North_American/Macintosh/Full_Installs/System_7.5_Version_7.5.3.part/./Apple_Support_Area/Apple_Software_Updates/English-North_American/Macintosh/System/Older_System/System_7.5_Version_7.5.3/.Since you're it sounds like you're dealing with a bare system you'll also need to find a way to write the disk images onto physical floppy disks.ġ These files can be found, e.g., under the following paths (replace "English-North_American" or "English-International" with the desired language): Note that these assume you already have System 7 on your Mac though there is a work-around for older OSes 2. You'll probably need to start with System 7.5.3 then update to 7.5.5 1. Most (possibly all) of the files previously hosted there are available from either as a 7.4GB zip file or as individual files. These used to be available at .com but that site's been down for ages.
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