Alternatively, why not boot the 7500 from your Retail OS 9 CD and install the USB support files either by Custom Install or by extracting the relevant files with TomeViewer?
Are you aware that a USB mouse will not be effective, after startup, before the USB extensions have been loaded (into memory) with the OS? That means that none of the shortcut keys for disablement of extensions, rebuilding of the Desktop, bypassing the current startup volume, and so on, will be available to you during startup. This has considerable bearing on your avowed purpose of troubleshooting in a system with a USB mouse attached.
Are the Intel Mac and the 7500 the only Macs at your disposal? I take it that you cannot use a floppy disk to transfer just the USB support files? Is download of the USB files to the Intel Mac and transfer by ethernet to the 7500 for expansion and decoding not an option for you?
If a custom CD remains your choice, you will have the greatest chance of making one successfully, even if some parts of the exercise may seem to be overkill, if you:
1) use HFS rather than HFS+ file format for the CD, thereby removing the 'wrapper' as a level of complexity;
2) burn as data, with 'make CD bootable' chosen;
3) burn at lowest available speed onto a CD-R blank;
4) check that the normally invisible Desktop files are included with other data files;
5) do this from a non-Intel Mac that is Classic Mode-aware, or better, from a Mac that supports (can boot directly into) OS 9 and below.
In the light of this prescription, the least-fuss method and best long-term investment for achieving your purpose may well be purchase of a working ADB mouse, even if that is slower. ADB II mouses are as cheap as chips nowadays. In the short term, however, direct installation of the USB support software will at least get a useful mouse presence for you once the 7500 has reached a functional Desktop.
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Are you aware that a USB mouse will not be effective, after startup, before the USB extensions have been loaded (into memory) with the OS? That means that none of the shortcut keys for disablement of extensions, rebuilding of the Desktop, bypassing the current startup volume, and so on, will be available to you during startup. This has considerable bearing on your avowed purpose of troubleshooting in a system with a USB mouse attached.
Are the Intel Mac and the 7500 the only Macs at your disposal? I take it that you cannot use a floppy disk to transfer just the USB support files? Is download of the USB files to the Intel Mac and transfer by ethernet to the 7500 for expansion and decoding not an option for you?
If a custom CD remains your choice, you will have the greatest chance of making one successfully, even if some parts of the exercise may seem to be overkill, if you:
1) use HFS rather than HFS+ file format for the CD, thereby removing the 'wrapper' as a level of complexity;
2) burn as data, with 'make CD bootable' chosen;
3) burn at lowest available speed onto a CD-R blank;
4) check that the normally invisible Desktop files are included with other data files;
5) do this from a non-Intel Mac that is Classic Mode-aware, or better, from a Mac that supports (can boot directly into) OS 9 and below.
In the light of this prescription, the least-fuss method and best long-term investment for achieving your purpose may well be purchase of a working ADB mouse, even if that is slower. ADB II mouses are as cheap as chips nowadays. In the short term, however, direct installation of the USB support software will at least get a useful mouse presence for you once the 7500 has reached a functional Desktop.
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