william, apparently a -001 option, not a -003 option. but please be gentle with me i am just starting out with fluke 9000's! when i get the service and user manuals i'll have better info to work from. interestingly, the 9010a service manual (after page 6-2 of the 9010a service manual) states on page 001-1 in the theory of operation that the rs232 card is auto detected. i guess i am hoping that the 9020a will auto detect this card! for completeness sake, the following labels are attached: - 9020A-002/AB (sticker on bronze bracket over piggy-back assy) - piggyback assy 649459, 9000a-3004 rev b - piggyback assy U1 1.0 649491 - piggyback assy U2 1.0 651463 - u18 1.0 649509 - u19 1.0 649517 - u20 1.0 651448 - u21 1.0 651455 - iee488 rom u2 1.0 649483 _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/