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| Subject:
Communications between a floppy disk drive and a controller in a PC.
Category: Computers Asked by: needham-ga List Price: $50.00 |
Posted:
04 Jan 2005 05:07 PST
Expires: 03 Feb 2005 05:07 PST Question ID: 451577 |
I would like to know the command format and communication protocol between a floppy disk drive and the drive controller (on a PC). Basically, I want to know the format of data that is sent over the cable between the floppy disk drive and controller in a PC. |
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| Subject:
Re: Communications between a floppy disk drive and a controller in a PC.
From: sdfas-ga on 04 Jan 2005 08:14 PST |
Floppy cable pinouts: PIN 1 Ground PIN 2 Unused PIN 3 Ground PIN 4 Unused PIN 5 Ground PIN 6 Unused PIN 7 Ground PIN 8 Index PIN 9 Ground PIN 10 Motor Enable A PIN 11 Ground PIN 12 Drive Select B PIN 13 Ground PIN 14 Drive Select A PIN 15 Ground PIN 16 Motor Enable B PIN 17 Ground PIN 18 Direction (Stepper Motor) PIN 19 Ground PIN 20 Step Pulse PIN 21 Ground PIN 22 Write Data PIN 23 Ground PIN 24 Write Enable PIN 25 Ground PIN 26 Track 0 PIN 27 Ground PIN 28 Write Protect PIN 29 Ground PIN 30 Read Data PIN 31 Ground PIN 32 Select Head 1 PIN 33 Ground PIN 34 Ground |
| Subject:
Re: Communications between a floppy disk drive and a controller in a PC.
From: sdfas-ga on 04 Jan 2005 08:26 PST |
The controller encodes the bits using MFM (http://www.storagereview.com/guide2000/ref/hdd/geom/dataMFM.html) into a fluctuating voltage, which it sends down pin 22. The drive head (an electromagnet) aligns the magnetic media into North-South when the voltage is high, or South-North when the voltage is low (I might have that backwards). |
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