zotog@sersun0.essex.ac.uk (02/27/90)
To any body interested here are the pin assignment for a standard 34-way floppy disk bus. (Taken from a Computer Engineer's pocket book ) this 1||2 not connected, reserved, or 0V side 3||4 IN USE or HEAD LOAD, NOT(HLD) == NOTCH 5||6 DRIVE SELECT 4, NOT(DS4) 7||8 INDEX, NOT(IP) 9||10 DRIVE SELECT 1, NOT(DS1) GND 11||12 DRIVE SELECT 2, NOT(DS2) 13||14 DRIVE SELECT 3, NOT(DS3) or 15||16 MOTOR ON, NOT(MOTOR) 17||18 DIRECTION SELECT, DIRC 19||20 STEP, STEP 0V 21||22 WRITE DATA, WD 23||24 WRITE GATE, WG 25||26 TRACK 00, NOT(TR00) 27||28 WRITE PROTECTED, NOT(WPRT) 29||30 READ DATA, RDATA 31||32 SIDE SELECT, SIDE 33||34 READY, NOT(RDY) If any one is interested I could send more info abouteach pin. By the way the above pin out applies and to the 3.5 drives with 34 pin connector.
amichiel@rodan.acs.syr.edu (Allen J Michielsen) (02/28/90)
In article <3257@servax0.essex.ac.uk> zotog@sersun0.essex.ac.uk writes: > > >here are the pin assignment for a standard 34-way floppy >above pin out applies and to the 3.5 drives with 34 pin connector. Just so we don't have to hear this later, the key word above is standard. Shugart, and everybody else made full ht, 1/2 ht, or 3.5" drives that use the same comnnector, (34 header, or 34 Pin) which were NOT standard. They were/are used in PCjr's, apples, macs, and SOME of the (more) oddball pc clones. (I believe eagle may fall in this group but....). I know of no way to tell from looking at a particular drive if it is oddball, serial, or non standard. The above info DOES however cover probably over 90% of computer drives currently in use & is veru good & helpful. al
Ralf.Brown@B.GP.CS.CMU.EDU (02/28/90)
In article <2261@rodan.acs.syr.edu>, amichiel@rodan.acs.syr.edu (Allen J Michielsen) wrote: }standard. Shugart, and everybody else made full ht, 1/2 ht, or 3.5" drives }that use the same comnnector, (34 header, or 34 Pin) which were NOT }standard. They were/are used in PCjr's, apples, macs, and SOME of the }(more) oddball pc clones. (I believe eagle may fall in this group but....). Not the Eagle PC I had. I put one of its floppy drives into the AT clone I bought to replace it. All I had to do was mask pin 34 (the XT vs AT difference in pin 34's meaning....). -- UUCP: {ucbvax,harvard}!cs.cmu.edu!ralf -=- 412-268-3053 (school) -=- FAX: ask ARPA: ralf@cs.cmu.edu BIT: ralf%cs.cmu.edu@CMUCCVMA FIDO: Ralf Brown 1:129/46 "How to Prove It" by Dana Angluin Disclaimer? I claimed something? 14. proof by importance: A large body of useful consequences all follow from the proposition in question.