Epson Chip set info
Excellent product and it works! However, there does not appear to be any detailed information about it, so I had to make some assumptions.
I had an early version of the Epson CISS and never updated the printer firmware. However, the printer failed and I bought the same model second hand but of course it was using the latest cartridges and had updated firmware. This chip-set is easy to replace in the early model CISS but it differs from the original, which required a battery. This new version does not require a battery as it is powered from the printer supply.