IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)

Command Summary
oindicates 'logical 0' for that bit, 1 means 'logical 1',
X means 'don't care'.
DATA BUS
PHASE RIW D7 D6 D5 D4 D3 D2 Dl DO REMARKS
READ DATA
Command W MT MF SK 0 0 1 1 0 Com mand Codes
W X X X X X HD US1 usn
W C Sector 10
W H information prior
W R to Command execution
W
N
W
EDT
W
GPl
W
DlL
Exec"tion
Data-transfer between
the FDD and main-system
Result R ST 0 Status information after
R ST 1 Command execution
R ST 2
R C Sector 10 information
R H after Command execution
R
R
R
N
READ DELETED DATA
Command W MT MF SK 0 1 1 0 0 Command Codes
W X X X X X HD US1 usn
w C Sector I D information
W H prior to Command
W R execution
W
N
W
EDT
W
GPl
W
DlL
Execution
Data-transfer between
the FDD and main-system
Result R ST 0 Status information after
R ST 1 command execution
R ST 2
R C Sector 10 information
R H after command execution
R
R
R
N
WRITE DATA
Command W MT MF 0 0 0 1 0 1 Command Codes
W X X X X X HD US1 usn
w C Sector I D information
Execution
W H to command execution
W
R
W
N
W
EDT
W
GPl
W
DTl
Data-transfer between
the main-system and FDD
Result R STO Status information after
R ST 1 command execution
R ST 2
R C Sector 10 information
R H after command execution
2-96
R
R
R
N