deskthority

Does anyone have a pinout for a ML4100 PS/2? Picked up some oddball terminal ones in an auction. They look like the older PS/2 controllers but the wiring colors correspond to USB.

I don't have a PS/2 version on hand to check the pins. Thanks.

What exactly do you need? I could check later.

Just the pinout for the PS/2 cable itself.

The controller board is similar to the one in the wiki, but the layout of some of the components and color of the wires are different.

Mine differs from the wiki pictures as well.

Anyway, there is one 5-pin header on the PCB where the cable is soldered wire by wire. Solder side has pin numbers.

1 - thick black wire - SHIELD
2 - yellow wire - PS/2 CLOCK
3 - thin black wire - GND
4 - green wire - VCC
5 - white wire - PS/2 DATA

Could you post some pictures how those boards look like?

EDIT: I haven't given mini-DIN pin numbers in the table above, but you can easily work that out from the signals.

Sorry for the late reply and the terrible pictures, I did the best I could with my phone.

These boards aren't even that old, I think according to the date code, 2009. But one was a mod-8 jack and the other was some sort of odd scan gun serial type connector. Both boards internally look the same. Unfortunately both cables were removed when I got the keyboards so all I have is the ends. Also you can see in the pictures there is a layer of copper shielding. I am not sure if that is common on these. I know my USB version does not have it.

At least the key caps were in good shape.

Nice pictures. Visually the controller PCB matches mine, at least what I could remember from it before assembling it back. Mine dates from around the same time, so they could be the same revision.

I think the Freescale MCU markings match as well, so you have pretty good chance to restore it with a mini-DIN. Cable wire colors are different, so simply ignore them and follow the 5-pin header numbers and PS/2 mini-DIN signals. You might want to cut and replace the cable tie.

The copper foil and two plastic separators are present on mine.

I have never scored USB version so far. Can you make similar pictures of it, too? I remember there are USB only and dual PS2/USB version.

Thanks for the info Woody.

Here are some pics of one of the USB ones I have one hand. G84-4100PTAUS S41.

I have a newer 86 key at work too but I won't be able to get pictures of that until Thursday.

Nice, a PS2/USB combo one.

Good to see Cherry switched to two-layer PCB and SMD assembly. Also EMI care with RC dampeners on each long line.

Mine are mostly G84-4100LPAUS, the 83-key lasered PS/2 version.

Thanks for the pictures!

I am curious now: I own an PS/2 G84 like shown in the first pics (i think) and I really would prefer USB connectivity. Is there any (easy) possibility to achieve this?

Possibilities - yes, various. Easy - no, for my definitions of "easy".

Get an external PS/2 to USB converter.

Thanks, but I kind of have had bad experiences with them. I will think about it.