Sb: #1400LT Hard Disk Fm: Stephen Lankton 70305,1142 To: Ellen DiPiazza 72747,544 (X) Ellen, the CMI 20meg. HD sells for about $755 from Marymac company in Texas and is the very same one Tandy installs fro $1200. You must also make the change of the resistor and diode I wrote about if you want to get the longest battery life. The HD plugs right in the drive B: slot (which comes out, of course) and the cables just plug right in. The battery pulgs into it -- all with existing wiring. The controller brd. slips in the Tandy board slot and bingo...it works right off the bat. The docs are good...very good. The change in the diode I wroe about it NOT NOT NOT hard if you can use a screw driver and soldering gun AT ALL. But get the exact right diode and not the RS equivalent! RS repair installs the HD IF and ONLY IF you buy Tandy's as far as I know. Marymac's JIM might put there's in for you if you talk sweetly to him. I thought he was very flexible. It is all portable and durable. Battery life is about 3-4 hours with it. The model 3500 or 3500A is an indication of a minor change to the PS (which seems to be rather insignificant) -- this serial number is stampded on the ID plate on the bottom quite clearly. Finally, I don't know a bit about the 5.25 inch drive, sorry. I suspect the logic of the floppy control board (on the drive) must be the same as Tandy expects it to be and IBM may or may not match. How about checking the question with someone like Ray Reyes on this sig. (or you can find him on the Tandy2000 sig...he is very informed about a number of things and that may be one of them. ---------------------------------- Sb: #8991-#1400LT Hard Disk Fm: Kelly J. Boldan 72371,413 To: Stephen Lankton 70305,1142 (X) Can you provide address of Marymac Co. in TExas?? ------------------------------------------- Sb: #22964-1400LT Hard Disk Fm: Charles Robertson 70130,330 To: Kelly J. Boldan 72371,413 (X) kelly, if you'll do a GO MM it gives their address in their CIS area (somewhere) -------------------------------------------- Sb: 1400LT Hard Disk Fm: Horace Ory 71625,1006 To: Ellen DiPiazza 72747,544 (X) There is a file in LIB 5 called LTCABL.TXT that describes how to hook up an external 5.25" floppy to the 1400LT, including the proper line arrangement.