Gotek 34-pin floppy drive emulator pinout

The SFR1M44-U100K is a 5 V floppy emulator with a 34-position header. FlashFloppy can assign different signals on pins 2 and 34 for different host interfaces.

34-position floppy header

34 contacts Current package

Gotek · Two rows of 17 positions. Some connectors use a missing key contact.

34-position floppy header pinout

Connector contact positions. Match the board’s pin 1 marking to the cable stripe.

Selected pin details

17 · GND

Return or key · Ground

Ground position in the standard interface. Some keyed headers omit a contact.

FlashFloppy documentation, Testing I/O Pins and FF.CFG

Electrical limits · Link to this pin

All 34 pins

Pin	Signal	Direction	Function
1	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
2	Disk Change / Density Mode dependent	Mode dependent	Pin 2 function depends on the selected interface.
3	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
4	Reserved Reserved	Reserved	Leave unused unless the host-specific guide assigns this contact.
5	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
6	Reserved Reserved	Reserved	Leave unused unless the host-specific guide assigns this contact.
7	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
8	Index Output	Output	Pulses emulate the disk index signal.
9	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
10	Drive Select 0 Input	Input	Select input when jumper S0 is fitted.
11	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
12	Drive Select 1 Input	Input	Select input when jumper S1 is fitted.
13	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
14	Reserved Reserved	Reserved	Check the host wiring before using a cable with nonstandard assignments.
15	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
16	Motor On Input	Input	Motor input or select under the relevant configuration.
17	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
18	Direction Input	Input	Host step direction.
19	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
20	Step Input	Input	Host step pulse.
21	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
22	Write Data Input	Input	Data pulses from the host during write.
23	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
24	Write Gate Input	Input	Host requests writing when asserted.
25	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
26	Track 0 Output	Output	Indicates track zero.
27	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
28	Write Protect Output	Output	Indicates a write-protected image or mode.
29	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
30	Read Data Output	Output	Read pulses from the selected image.
31	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
32	Side Select Input	Input	Selects the emulated head.
33	GND Return or key	Return or key	Ground position in the standard interface. Some keyed headers omit a contact.
34	Disk Change / Ready Mode dependent	Mode dependent	Pin 34 depends on the host interface selected in FlashFloppy.

Signal assignments

Host controls

Match the host selection signal and drive jumper. Cable twists can change the apparent drive selection.

Read and status

These outputs report the state of the emulated disk and drive.

Electrical limits

Parameter	Limit	Conditions and source
DC supply5 V	5 V	Use the separate 3.5-inch floppy power connector. Verify the harness against the model manual. Gotek SFR1M44-U100K user manual
Header pin 34Ready or disk change	Ready or disk change	FlashFloppy maps ready in Shugart mode and disk change in the IBM PC mode. FlashFloppy documentation, Testing I/O Pins and FF.CFG

Models and documents

The map describes a standard 34-position SFR unit with FlashFloppy. Confirm the exact board and firmware before configuring the drive. The 26-contact laptop versions use a different connector.

SFR1M44-U100K: 34-position SFR model with the FlashFloppy interface mapping.

Gotek SFR1M44-U100K user manual· Model marking, supply and connector information.
FlashFloppy 34-pin header assignments· Firmware author’s pin assignment and I/O test documentation.
FlashFloppy configuration· Shugart and IBM PC interface settings.