Reviving an old thread here, but I thought this may be a place to seek help.
I'd like to use a PS/2 mouse / keyboard with my PowerPC Macs. I bought a cheap PS/2 to USB adapter online, but it doesn't work with any Mac, new or old.
Is there a specific PS/2 to USB adapter that will work for Macs?
#0
Don't buy one like this if your mouse and keyboard don't support both PS/2 and USB. It is a passive adapter which means all it does is rewiring. There is no circuit doing protocol conversion inside. It only works with some mice and keyboards that support both PS/2 and USB (they will select which protocol to operate with at power-on). Most of them are originally shipped with one of these adapters.
The ones that work with pure PS/2 devices are active adapters. They have a circuit inside to converse protocol. I've tried three of them and they are not equal.
All this is based on using a Logitech PS/2 mouse. I don't have a PS/2 keyboard.
#1
This one is fussy about which USB port it is plugged into. I think it wants ones that have more direct path to USB controllers in the Mac. It is not hot-swappable which, by the book, means if you unplug it while you're working, you will need to restart the Mac to get it work again. But in real life, it rarely comes back after restart. I often have to turn off the Mac, unplug it and everything connected to it from the wall and wait for the electricity to drain off before turning them back on (perhaps to reset USB bus), to make it work again.
By the way you can't go by the look alone. I mean some adapters with the same external appearance as #1 have the gut of #3 inside, which is very good. So I think I should include its System Profiler's info which is more reliable.
Shows up as "Generic USB K/B"
Product ID: 0x0017
Vendor ID: 0x13ba
Version: 0.01
#2
Much better than #1, works with every USB port of my Mac, hot-swappable. But there is no mouse acceleration after cold-boot (which means when the Mac is turned on after it hasn't received power from the wall for a while). I have to unplug the adapter and re-insert it to fix that.
Shows up as "PS2toUSB Adapter"
Product ID: 0x98d2
Vendor ID: 0x0826 (Data Transit)
Version: 2.80
#3
Best all-around, has similar features of #2 without the mouse acceleration problem. However, there is a quirk which is neglectable for me, i.e., the mouse can move in vertical direction only in Boot Manager (which is when you boot the Mac with Option key pressed to select a boot drive). It is neglectable because I can use arrow keys on keyboard to select it instead.
Shows up as "Barcode Reader"
Product ID: 0x0018
Vendor ID: 0x13ba
Version: 0.01
*Some #3 adapters have the same external appearance as #1
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Update: Well, I am embarrassed to say that all the tests were done on an Intel Mac mini. I've just found out that all of mine don't work with my MDD. I searched for more info and found that the ones I have probably support Intel Macs only.
For PPC macs, I've found this adapter that says it works, quite pricey, though.
https://www.aten.com/global/en/products/kvm/kvm-modules-&-accessories/uc100kma/
"PS/2 to USB Adapter with Mac support"
"Platforms Windows 2000/XP/Vista/Linux Mac OS 8.6 or Higher SUN Solaris 8"
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