Command Summary - IBM 5150 Hardware Reference Manual

Command Summary
o
indicates '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
W
H
to command execution
W
R
W N
W EDT
W
GPl
W DTl
Execution
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
R R
R N
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