ROM Notes for Keithley 485 Picoammeter:

The 485-800-A2 ROM is in a Mitsubishi M5L2764K 250ns 64K Eprom. Works with PCB CAL enable jumper on units without cal switch. Used AMD 2764A Eprom for this.


The 485-800-B1 ROM is in a Mitsubishi M5L2764K 250ns 64K Eprom. Does NOT work with PCB CAL enable jumper on units without cal switch.