1.9 - Norsk Data glossary

• FDD - Floppy Disc Drive
  GO FAR Wikipedia % for more information.
  
• FFD 5¼ - Cable pinout
  The ribbon cable pinout for a standard Norsk Data 5¼" floppy disc drive.
  

  Pin no.	Signal			Description
  	name	active	direction
  1 - 33	GND			All odd pins are grounded. On some drives the pin 5 is N.C. as this pin is keyed/blocked in the connector at controller end to avoid the cable to be inserted the wrong way.
  2	REDWC	Low	⇒	Density select	0 = High density
  					1 = Low density
  4	FDT	Low	⇐	Floppy drive type, not used by ND	0 = Micro floppy, 3½"
  					1 = Mini floppy, 5¼"
  6	DS3	Low	⇒	Select drive 4	0 = Drive selected
  					1 = Drive not selected
  8	INDEX	Low	⇐	Index hole	0 = Index hole/sector 1 mark
  10	DS0	Low	⇒	Select drive 1	0 = Drive selected
  					1 = Drive not selected
  12	DS1	Low	⇒	Select drive 2	0 = Drive selected
  					1 = Drive not selected
  14	DS2	Low	⇒	Select drive 3	0 = Drive selected
  					1 = Drive not selected
  16	MOTOR	Low	⇒	Motor enable	0 = Floppy motor is on
  					1 = Floppy motor is off
  18	DIR	Low	⇒	Head step motor direction	0 = Stepping in, track no. inc.
  					1 = Stepping out, track no. dec.
  20	STEP	Low	⇒	Head step puls	0 = Move one step/track
  22	WDATA	Low	⇒	Write data
  24	WGATE	Low	⇒	Write gate enable	0 = Write enabled
  					1 = Write disabled
  26	TRK00	Low	⇐	Track 0	0 = Track 0 mark
  28	WPT	Low	⇐	Write protect	0 = Write protected
  					1 = Write allowed
  30	RDATA	Low	⇐	Read data
  32	SIDE1	Low	⇒	Head 1 select	0 = Head/side 1 selected
  					1 = Head/side 0 selected
  34	DSKCHG	Low	⇐	Floppy disc changed/Drive ready	0 = Ready
  					1 = Diskette changed

• FG - Floppy jumper
  Frame Ground.
• FH - Full Height
  GO FAR Wikipedia % for more information.
  Standard height for 5¼" FDD and HDD, 3¼", approx 83 mm.

This page was last updated 27. Jan. 2025
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