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Yes I tested all of the options, the higher refresh rates yielded a blank screen. I wonder what other resolutions will be unlocked on my other macs.

You sir/madam are a legend! SwitchRes has indeed enabled 1024x768 resolution under 8.6. It's a bit hard on the eyes at 60Hz, but at least I have the option to get some more screen real estate when I need it. Thank you!

Oops I replied to myself. Oof.

No problem, I have a few partitions available, so I'll experiment on spare one.

I've never heard of this, will give it a shot

I will give this a shot, hopefully I don't brick the machine.

Check out the apple repair manual page 231, DB-15 display output is an optional upgrade which fits in to a 22 pin connector on the logic board: http://www.applerepairmanuals.com/the_manuals_are_in_here/PM_Perf54_5500.pdf I believe the video setup is similar between the 6360 and 5400 logic...

I agree it is likely to be something in the system folder, I just haven't been able to figure out what. I run 8.6 because I notice everything is slower under OS 9, and aside from the aforementioned resolution and USB audio support, it doesn't offer anything else I need.

According to everymac.com this machine does support 1024x768: https://everymac.com/systems/apple/mac_performa/specs/mac_performa_5400_180.html The higher resolution is available on mine under OS 9 but not 8.6. The external DB-15 video connector, which isn't present on my machine, is just an...

I do have show all selected under 8.6 and it maxes out at 832x624.

Yes I normally run at 256 colours 832 x 624.

I'm trying to figure out a discrepancy in the available display resolutions on my beloved Performa 5400. Normally I run Mac OS 8.6 on this machine, however I have a second partition running 9.0.X. Under 8.6 the maxumum resolution available is 832 x 624, but under OS 9 it's 1024 x 768. I do a lot...

Just when I thought I'd run out of possible upgrades! This scares me but I might give it a shot - my frame rates in Quake could use a boost.

This is pretty amazing work. I have a 5400 with a 400 MHz sonnet G3 upgrade, this has got me wondering if I can squeeze a bit more performance out of it with the 50mhz mod.

This is fantastic! I have a music studio which is full of old Macs, this would be very useful to get my SE/30 and Mac Plus in to the loop.

I guessed from the nifty icon that the old Macs show when connected. Shame Synology dropped support, hopefully I can manually keep it going - I was thinking I should see about getting the latest versions installed if I can.

I recommend persevering with the network option. You will need to find some guides and spend the time to get it going, but it's very convenient once it's going. I use a Synology NAS which I'm pretty sure uses netatalk, and can connect to it from all my old Macs as well as my modern stuff. It's...

That's very interesting, I did not know about initiator mode. This will come in handy in future. I have the diode and the guide to add termination power for the Plus, if the SCSI gods are smiling then I hope it will work! After moving the control panel I was after to a floppy, I was able to get...

It works well with the plus?

I'm glad to say the floppy drive works, and I was able to grab the drivers and some other files with it. I will post these to the appropriate online repositories, as it seems there is no other record of this software.