MFM interface

Pins layout

Connector : Edge34 + 2xEdge20
J1 J2 J2

J1
D	Description	Name	Pin		Pin	Name	Description	D
/	Ground	GND	1		2	Reserved	Reserved
/	Ground	GND	3		4	Head Select 2	Head Select 2	O
/	Ground	GND	5		6	Write Gate	Write Gate	O
/	Ground	GND	7		8	Seek Complete	Seek Complete	I
/	Ground	GND	9		10	Track 0	Track 0	I
/	Ground	GND	11		12	Write Fault	Write Fault	I
/	Ground	GND	13		14	Head Select 0	Head Select 0	O
/	Ground	GND	15		16		To J2 Pin 7	/
/	Ground	GND	17		18	Head Select 1	Head Select 1	O
/	Ground	GND	19		20	Index	Index	I
/	Ground	GND	21		22	Ready	Ready	I
/	Ground	GND	23		24	Step	Step	O
/	Ground	GND	25		26	Drive Select 1	Drive Select 1	O
/	Ground	GND	27		28	Drive Select 2	Drive Select 2	O
/	Ground	GND	29		30	Drive Select 3	Drive Select 3	O
/	Ground	GND	31		32	Drive Select 4	Drive Select 4	O
/	Ground	GND	33		34	Direction In	Direction In	O
J2
D	Description	Name	Pin		Pin	Name	Description	D
I	Drive Select	Drive Select	1		2	GND	Ground	/
	Reserved	Reserved	3		4	GND	Ground	/
	Reserved	Reserved	5		6	GND	Ground	/
/	To J1 Pin 16		7		8	GND	Ground	/
	Reserved	Reserved	9		10	GND	Ground	/
/	Ground	GND	11		12	GND	Ground	/
O	+ MFM Write Data	+MFM W D	13		14	-MFM W D	- MFM Write Data	O
/	Ground	GND	15		16	GND	Ground	/
I	+ MFM Read Data	+MFM R D	17		18	-MFM R D	- MFM Read Data	I
/	Ground	GND	19		20	GND	Ground	/

Note : there are 1 J1 connector, same for all devices, and 2 J2 connectors, one for each device.

Author: Philippe MAJERUS; Webmaster: Philippe MAJERUS.