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

Sequential Circuits Drumtraks OS v0.5 EPROM Firmware Upgrade KIT / New ROM Chip

Alesis HR-16 / HR-16B EPROM Upgrade - Original OEM Sound ROM + OS 2.0 Firmware

Alesis HR-16 / HR-16B EPROM Upgrade - Full Roland TR Series: TR-505, 606, 626, 7

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

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

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

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