The board is QUME PC-Enhanced Terminal keyboard with an RJ11 plug. I'll convert it for PC usage later
![Smile :)](./images/smilies/icon_e_smile.gif)
Its an OEM keyboard made by WYSE in 1991~93. The keycaps are standard that it originally came with. Probably made by SP. Its probably also safe to assume that SP made all the WYSE keyboard keycaps.