ram is no longer a problem There are 100% equivalent ram on EBAY I bought this model at this seller and all is ok : https://www.befr.ebay.be/itm/1Stuck-1-piece-MK48T08B10-TIMEKEEPER-SRAM-64Kb-100ns-M48T08-M48T18-DS1743-NEW/271878833062?hash=item3f4d3dc3a6:g:JRYAAOSwPIhZ6d3b