Intel mcs-48 manual IntJ

intJ

TABLE 1. 8272 COMMAND SET

8272

		I	DATA BUS
PHASE	AIW	Dr De D6 D4 Da DZ D, DO
			READ DATA
Command	W	MT MFM SK	0 0	, , 0
	W	0 0 0	0 0	HDS OS, DSO
	W		C
	W		H
	W		R
	W		N
	W		EDT
	W		GPL
	W		DTL

Execution

Result	R			STO
	R		ST'
	R			ST2
	R			C
	R			H
	R			R
	R			N
		READ DELETED DATA
Command	W	MT MFM SK	0	1	• 0 0
	W	0 0 0	0	0	HDS OS, 050

WC

WH

WR

WN

WEC.

REMARKS

Command Codes

Sector 10 information prior to Command execution

\

Data transfer between the FOD and main-system

Status Information after Command execution

sector 10 Information after command execution

Command Codes

Sector 10 information prior to Command execution

DATA BUS

PHASE	AIW	Dr D, D6 D4 Da Dz D, DO
				READ A TRACK			,
Command	W	0	MFM SK	0	0	0		0
	W	0	0 0	0	0	HOS 051		DSO
	W				C
	W				H
	W				R
	W				N
	W				EDT
	W			GPL
	W				DTL

Execution

Result	R				STO
	R				STI
	R				ST2
	R					C
	R					H _____
	R					R
	R					N
						READ 10		, 0
Command	W	0	MFM	0	0	1	0
	W	0	0	0	0	0	HDS OS. DSO

REMARKS

Command Codes

Sector 10 Information prior to Command

execution

Data transfer between the FDD and maln-Iystem.

FCC road. all of

cylinders contents from Index hole to

EDT

Statu8 Information

after Command

execution

Sector 10 Information

after Command

execution

Commands

WGPL

WDTL

Execution

The first correct 10 Information on the

Execution

Result	R					STO
	R					ST1
	R					ST2
	R					C
	R					H
	R					R
	R					N
					WRITE DATA				•
Command	W	MT MFM		0	0	0	·1	0
	W	0	0	0	0	0	HOS 051		050
	W					C
	W					H
	W					R
	W					N
	W					EDT
	W					GPL
	W					DTL
Execution
Result	R					STO
	R					ST.
	R					ST2
	R					C
	R					H
	R					R
	R					N
				WRITE DELETED DATA
Command	W	MT MFM		0	0	•	0	0	1
	W	0	0	0	0	0	HDS OS. DSO

WC

WH

WR

WN

WEDT

WGPL

WDTL

Execution

Aesult	R	STO
	R	ST.
	R	5T2
	R	C
	R	H
	R	R
	R	N

Data transfer between the FOO and main-system

Status Information after Command execution

Sector 10 information after Command execution

Command Codes

Sector 10 information prior to Command execution

Data transfer between the main- system and FOO

Status information after Command execution

Sector 10 information after Command execution

Command Codes

Septar 10 Information prior to Command execution

Data transfer between the FOO and main-system

Status information after Command execution

Sector 10 information after Command execution

Result	R				STO
	R				STI
	R				ST2
	R				C
	R				H
	R				R
	R				N
					FORMAT A TRACK
Command	W	0	MFM	0	0	•	1 0 1
	W	0	0	0	0	0	HDS OS. DSO

WN

WSC

WGPL

W0

Execution

Result	R		STO
	R		ST.
	R		ST2
	R		C
	R		H
	R		R
	R		N
			SCAN EQUAL
Command	W	MT MFM SK	1	0	0 0 1
	W	0 0 0	0	0	HOS OS. DSO
	W		C
	W		H
	W		R
	W		N
	W		EDT
	W		GPL
	W		STP
Execution
Result	R		STO
	R		STI
	R		ST2
	R		C
	R		H
	R		R
	R		N

Cylinder Is stored In Data Register

Status Information after Command execution

Seotor 10 Information during Execution

Ph...

Command Codes

BytellSector

SectorsfTrack

Gap 3

Fllt.r Byt.

FDC formats an entire cylinder

Status Information after Command execution

In this case, the 10 information has no meaning

Command Codes

Sector 10 information prior to Command execution

Data compared between the FDO and main-system

Status Information after Command execution

Sector 10 Information after Command execution

Note: 1. Symbols used In this table are described at the end of this section.

2.AO'"1 for all operations.

3.X ... Don'tcare, usually made to equal binary O.

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