Some model Ms have high power consumption, there is a mod to replace a resistor which reduces it. This can upset some adapters and PCs. I used one with a ps2-

Some model Ms have high power consumption, there is a mod to replace a resistor which reduces it. This can upset some adapters and PCs. I used one with a ps2->usb adapter I bought about 10 years ago, I recall I had to do some research to find one that's known to work without issues. This is the adapter I have, looks like its no longer sold: https://www.clickykeyboards.com/product/ps-2-to-usb-adapter-converter-for-keyboards-blue-cube/ https://www.clickykeyboards.com/product/ps-2-to-usb-adapter-...