About the keyboard, this is a G80-0414H/09. It has plate-mounted Cherry MX Black. Though they are vintage they vary much in keyfeel, some of them feel very smooth and others are quite scratchy, I like the board and would use it nonetheless
Here's the full beast, it's a Portable Terminal from Siema (I'll get back on that one later).
I took the keycaps off to clean them as they were dirty and needed a good bath.
Yup, good old Cherry MX Blacks.
This Cherry MX Grey has a different colour than all the other ones I've seen, it must be the same discolouration as seen on the space bar switch of the 0924 [wiki]File:G80-0924_--_MX_Linear_Grey_on_spacebar.jpg[/wiki]
There is a diode near the spacebar switch
But not near this one, which is the Caps Lock switch ... there is even a hole for it, why is there no diode ?
My all-time favourite keycaps, Cherry doubleshots, with the Row 5 from Cherry, nice.
Those 0 are sexy !
Took the upper case off.
Upper left corner sticker.
This is the back side, bottom sticker, it says the keyboard is a G80-0414H/09. Serail number : 102316 C30. I've been told that the "C30" is the date code but is not compatible with the "normal" Cherry dating. So it would be great if someone could tell me from what year this was from.
You can see that there is some markings under the sticker, presumably a Cherry logo and some kind of number. (which both can be made out)
This is the microcontroller, which is said to have "2K bytes mask-programmed ROM, 128 bytes RAM".
source : http://datasheets.chipdb.org/Philips/MAB8050H.pdf
Some more marking on the PCB.
This is intriguing to me as I'm not too familiar with PCB making, there is some diode markings on the pcb but they aren't everywhere, I'd think that they should as they are usually used to make a keyboard NKRO, right ? So these must be here to prevent ghosting on certain frequently used keys ? I don't know really, would be great if someone explained to me.
No marking on the middle of the keyboard.
This has been home-made for sure
At least it's got a detachable cable