Check the listing for details. Digitech DSP 256 OS v1.05 EPROM Firmware Upgrade KIT / New Final Update ROM Chip. Condition: New. Listed at 27.95 USD. Digitech DSP 256 OS v1.05 EPROM Firmware Upgrade KIT This upgrade version v1.05 is the last known upgrade issued by Digitech for the DSP 256. Included will be 1 brand new ATMEL EPROM chip to complete the upgrade. The DSP 256 itself is not for sale here, only the EPROM update chip will be supplied. This version 1.05 upgrade is serves as a supplemental release, intended to iron out any remaining kinks affecting general stability, bugs and improve performance within the firmware code. This update is only compatible with regular DSP 256 series units, not the DSP 256XL. If requested - A link will be e-mailed to you with the DSP 256 user manual for your own personal reference. I find this to be quite useful and informative Protect your investment by purchasing high quality components: ALL EPROM upgrade chips and components that I provide here are in fact brand new, high grade, recently manufactured and sourced directly from the manufacturer. Using new-age flash technology is the best way to ensure that the data integrity of your upgrades last well past our natural lifetime. Any questions? Send me a message, thanks! All EPROM upgrades I provide are prepared in an ESD-safe production environment and will be packaged in equally ESD-safe materials. Purchase with confidence!