I have my archived copy of the classic Mostek Databook from 1984 that does contain a Two Page "ADVANCE INFORMATION" Datasheet on the MK5370/MK5371/MK5372. Would you like a scan of it? Let me know. David In a message dated 10/2/2007 6:37:55 P.M. Central Daylight Time, joecolquitt@clear.net.nz writes: I wonder if anyone has any data (which will be old) for the Mostek MK5371 dialler. I've tried the usual suspects - datasheetlocator, chipdir, Google, (mummytiesmylaces ;-)) ), but no luck I've got a couple of telephone interfaces to make and recalled that I did have some MK5371 back in the late 80s, and sho'nuff, I still have them. The only project I used them for is long gone, as is the info I would need now If I have to I'll buy new dialler ICs, but putting the MK5371s back into solitary for another 20 years does seem a bit harsh TIA -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist ************************************** See what's new at http://www.aol.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist