IBM 5150 Hardware Reference Manual

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
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
2-96

IBM 5150 Specifications

General

Processor	Intel 8088
Clock Speed	4.77 MHz
RAM	16 KB - 256 KB
Manufacturer	IBM
Model	5150
Release Year	1981
Storage	5.25-inch floppy drives
Graphics	MDA or CGA
Operating System	IBM PC DOS
Ports	Cassette, keyboard
Expansion Slots	5