UMC (United Microelectronics) is a Taiwan-headquartered semiconductor manufacturer.
UM6868 appears to be a mask-programmable microcontroller. No datasheet has been found for it. UM6868 has seen use as a microcontroller-based keyboard encoders. UM6868 may be the underlying chip to Monterey AUM6868.
|UM6868-02||6540||BTC H01-A, 1001000620, R823C1||Packard Bell BTC 5131C|
|UM6868-03||9612||BTC H01-B, 1001000622, ZR831D||BTC 5140|
|UMC UM6868A-0038||9752||FAXC5||Unidentifiable KTX-branded rubber dome over membrane|
|6868A-10105||9916||ARON CORP., ZOOMⅡ KBD, F2PBO||Aron Zoom KB-A106S Mechanical Keyboard|
The example in the Aron keyboard is not necessarily a UMC part, as the chip is merely “6868A” instead of “UM6868A”. Other examples of UM6868 chips can be found, but only as surplus parts with no indication of their origin and purpose.