Roland TR-909 OS 4.0 EPROM Firmware Upgrade KIT [Midi Timing Fix] / New ROM Chip

Roland R-8M OS v1.04 EPROM Firmware Upgrade KIT / New ROM Final Update Chip

Alesis D4 OS version 1.04 EPROM Firmware Upgrade KIT / New ROM Update Chip

Roland R-8 OS v2.02 EPROM Firmware Upgrade KIT / / New ROM Final Update Chip R8

Roland R-8 MK2 OS v1.03 EPROM Firmware Upgrade KIT / New ROM Final Update Chip

Alesis HR-16 / HR-16B EPROM Upgrade - Roland TR-808 Classic Core Sounds + OS 2.0

Alesis HR-16 / HR-16B Custom EPROM Upgrade – Oberheim DMX & Sequential Circuits

Yamaha RM-50 OS 1.06 EPROM Firmware Upgrade KIT / New ROM Final Update Chips