Shy send me a document he had on replacing a floppy drive on the 9100s. It does appear that I was slightly incorrect where I thought Fluke made several changes to a drive to enable it to work, rather it appears there is one modification and that is for the Sony F17 series where you add a jumper wire from the Disk Detect switch to pin 14 of the CN101 connector (for DR1) and other than setting the drive to D0 that is all. ftp://ttl.arcadetech.org//home/mirrors/flippers/TTL/Test_Equipment/Fluke/9100%20Series/Floppy_Drive_PDFs/Fluke_Floppy_Replacement_Instructions_848283.pdf My modification table previously listed appears to be valid for upgrading a 9100A to revision G. If you have Revision G motherboard then I expect you have the 1.44 upgrade done look for a bunch of jumpers on the underside to see if your board is already upgraded, but then it should say Rv F or G if factory done... Finding working floppies is still problematic, SONY drives in the F17 series should work with the added jumper assuming the drive is good. I suggest you first try the SONY F17 drive setting and if not then the CANNON HD using Service Disc 6.0, after upgrading the EPROMs to RV5.0/40MB. If you want to update your MB to the G level allowing 1.44 Sony (?) floppies (& you need RV5.0 EPROM) then here are what I think are all the mods: 1) Cut traces @ W5, W6 and W7 2) Jumper W5 (connected to U27-P3) to U72-P9 (unused 7417 gate). 3) Jumper U72-P8 to W7 that connects to J14-P1 4) Jumper other side of W7 (ground) to W6 (side connected to J14-P4) 5) Jumper U27-P1 to U72-P5 (unused 7417 gate) 6) Jumper U72-P6 to J14-P16 (currently N/C) 7) Jumper W6 (connected to CHNG2 - J13-P1) to W5 (connected to J14-P2 - /SPARE) 8) for RV5.0 EPROM check that W2 is cut (40 Meg upgrade ROMs) ftp://ttl.arcadetech.org//home/mirrors/flippers/TTL/Test_Equipment/Fluke/9100%20Series/System_DiscsRV6/9100-V5-ROMs_40_Meg_upgrade.zip Photos: ftp://ttl.arcadetech.org/TTL/Test_Equipment/Fluke/9100%20Series/Photos/ Hope this helps others, saved me a bunch of time! John :-#)# -- How to subscribe or unsubscribe from TTL http://seven.pairlist.net/mailman/listinfo/techtoolslist _______________________________________________ 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/