On 13 Jul 2010, at 23:06, Mick wrote:
...
The larger "Y"-shaped keyboard/mouse-to-USB adapters usually support
non-USB-compatible PS/2 mice, though. I have one like this and it
works for me:
http://www.dealextreme.com/details.dx/sku.9291

Does this Y-shaped dongle contain any electronics in it?  Otherwise it
wouldn't be any different to a single connector.

Yes, I imagine so.

I've used a number like this: 
http://gbennett.whsites.net/zencart/images/products/usbps2.jpg
They are readily available from Chinese / HK sources on eBay or from LedShoppe.com, but I'm sure they're just the same as the one Paul linked to.

I've never known a mouse or keyboard not to work with them, including 1990s Model Ms.

They cause the mouse & keyboard to appear as HID devices, which are a standard part of the USB specification.

Stroller.

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