Intel mcs-48 manual Command SET

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TABLE 1. COMMAND SET (Continued)

I DATA BUS

PHASE RIW I D7 De D5 D4 D3 D2 Dl DO

SCAN LOW OR EQUAL

Command W MT MFM SK 1 1 0 0 1

W0 0 0 0 0 HDS DSl DSO

WC

WH

WR

I

REMARKS

Command Codes

Sector lD information

prior Command

execution

	I				DATA BUS
PHASE	RIW	07	D6	D5	D4	D3	D2	Dl	DO	REMARKS
					RECALIBRATE
Command	W	0	0	0	0	0	1	1	1	Command Codes
	W	0	0	0	0	0	0	DSl	DSO
Execution										Head retracted to
										Track 0

W

_____ N

SENSE INTERRUPT STATUS

WEOT

WGPL

WSTP

Execution

Data compared between the FOD and main-system

Command	W	0 0 0 0 1 0 0 0	Command Codes
Result	R	ST 0	Status Information at
	R	PCN	the end of each seek
			operation about the
			FDC
		SPECIFY

Result	R	STO	Status Information
	R	STl	after Command
	R	ST2	execution
	R	C
	R	H	Sector 10 Information
	R	R	after Command
	R	N	execution
		SCAN HIGH OR EQUAL

Command W 0 0 0 0 0 0 1 1 Command Codes

W_SPT ___.......---HUT -

W HLT • NO

SENSE DRIVE STATUS

Command	W	0	0	0	0	0	1 0	0 Command Codes
	w	0	0	0	0	0	HDS DSl	DSO
Result	R				ST 3			Status Information

Command W MT MFM SK 1 1 1 0 1

W0 0 0 0 0 HDS DSl DSO

WC

WH

WR

WN

WEOT

WGPL

WSTP

Execution

Command Codes

Sector 10 information prior Command execution

Data compared between the FDD and main-system

							about FoD
					SEEK
Command W	0	0	0	0	1	1 1	1 Command Codes
W	0	0	0	0	0	HDS DSl	DSO

WNCN

Execution	Head Is positioned
	over proper Cylinder
	on Diskette
	INVALID
Command W	____ Invalid Codes ____ Invalid Command

Result	R	STO	Status Information
	R	ST 1	after Command
	R	5T2	execution
	R	C
	R	H	Sector 10 Information
	R	R	after Command
	R	N	execution

			Code. (NoOp- FDC
			goes Into Standby
			Stale)
Result	R	5TO	STO=80
			(16)

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