HP1651A												Gotek pinout (all odd pins are GND)
DISK CHANGE RESET	1---(to Gotek Pin 4)			1
+5V					3---(to Gotek pwr conn)			3
+5V					5								5
+5V					7								7
+5V					9								9
+5V					11								11
RETURN				13---(to Gotek pwr conn)		13
RETURN				15------------------------------15
RETURN				17------------------------------17
RETURN				19------------------------------19
RETURN				21------------------------------21
RETURN				23------------------------------23
RETURN				25------------------------------25
RETURN				27------------------------------27
+12V				29								29
+12V				31								31
+12V				33								33
DISK CHANGE			2-------------------------------2	FPO5V_DSKCHGn
IN USE				4                (to HP Pin1)---4	FPI5V_PIN4 (tie to SWCLK)
DRIVE SELECT 3		6				                6	
INDEX				8-------------------------------8	FPO5V_INDEXn
DRIVE SELECT 0		10------------------------------10	FP5V_DS0n
DRIVE SELECT 1		12------------------------------12	FP5V_DS1n
DRIVE SELECT 2		14								14	n/c
MOTOR ON			16------------------------------16	FPI5V_MTRONn
DIRECTION			18------------------------------18	FPI5V_DIRn
STEP				20------------------------------20	FPI5V_STEPn
WRITE DATA			22------------------------------22	FPI5V_WDATAn
WRITE GATE			24------------------------------24	FPI5V_WGATEn
TRACK 00			26------------------------------26	FPO5V_TRK00n
WRITE PROTECT		28------------------------------28	FPO5V_WPTn
READ DATA			30------------------------------30	FPO5V_RDDATAn
HEAD SELECT			32------------------------------32	FPI5V_SIDEn
READY				34------------------------------34	FPO5V_READYn
















-------------------HP1651A------------------		Gotek pinout (all odd pins are GND)
DISK CHANGE RESET	1	2	DISK CHANGE				2	FPO5V_DSKCHGn
+5V					3	4	IN USE					4	FPI5V_PIN4 (route to DISK CHANGE RESET)
+5V					5	6	DRIVE SELECT 3			6	n/c
+5V					7	8	INDEX					8	FPO5V_INDEXn
+5V					9	10	DRIVE SELECT 0			10	FP5V_DS0n
+5V					11	12	DRIVE SELECT 1			12	FP5V_DS1n
RETURN				13	14	DRIVE SELECT 2			14	n/c
RETURN				15	16	MOTOR ON				16	FPI5V_MTRONn
RETURN				17	18	DIRECTION				18	FPI5V_DIRn
RETURN				19	20	STEP					20	FPI5V_STEPn
RETURN				21	22	WRITE DATA				22	FPI5V_WDATAn
RETURN				23	24	WRITE GATE				24	FPI5V_WGATEn
RETURN				25	26	TRACK 00				26	FPO5V_TRK00n
RETURN				27	28	WRITE PROTECT			28	FPO5V_WPTn
+12V				29	30	READ DATA				30	FPO5V_RDDATAn
+12V				31	32	HEAD SELECT				32	FPI5V_SIDEn
+12V				33	34	READY					34	FPO5V_READYn

RETURNs on odd pins can tie directly to equivalent Gotek pins 

Route DISK CHANGE RESET to SWCLK on programming header on Gotek

Route +5V, RETURN to power connector on Gotek
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