IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)
IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF) IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)
5-1/4" Diskette Drive Adapter External Interface Specifications REAR PANEL 37 PIN '0' SHELL CONNECTOR o 1 • • 20 • • • • • • • • 37 o AT STANDARD TTL LEVELS Pin no. Unused 1 ·5 Index 6 .. I... Motor Enable C 7 1""1" I... .... Drive Select 0 8 ... Drive Select C 9 I""'" - ..... Motor Enable 0 10 I... Direction (Stepper Motod 11 External ..... 5%" Diskette Drives ... Step Pulse 12 Drive .... Adapter ... Select Head 1 13 ~ Write Enable 14 ... - .... Track 0 15 Write Protect 16 Read Data 17 .. ~-.. Write Data 18 Ground 20·37 .. 2-109
5-1/4" Diskette Drive The IBM 5-1/4" Diskette Drive is a single sided, double density, 40 track unit. The Diskette Drive has a formatted capacity of 163,840 bytes, and is capable of reading and recording digital data using Modified Frequency Modulation (MFM) methods. User access for diskette loading is provided by way of a slot located at the front ~ of the unit. The Diskette Drive is fully self-contained and requires no operator intervention during normal operation. The Drive consists of a spindle drive system, a head positioning system, and read/write/erase system. When the front latch is opened, access is provided for the insertion of a diskette. The diskette is positioned in place by plastic guides, and the front latch. In!out location is ensured when the diskette is inserted until a back stop is encountered. Closing the front latch activates the cone/clamp system resulting in centering of the diskette and clamping of the diskette to the drive hub. The drive hub is driven at a constant speed of 300 rpm by a servo controlled DC motor. In operation, the magnetic head is loaded into contact with the recording medium whenever the front latch is closed. The magnetic head is positioned over the desired track by means of a 4-phase stepper motor/band assembly and its associated electronics. This positioner employs a one-step rotation to cause a I-track linear movement. When a write-protected diskette is inserted into the Drive, the write-protect sensor disables the write electronics of the Drive and an appropriate signal is applied to the interface. When performing a write operation, a 0.33 mm (0.013-in.) data track is recorded. This track is then tunnel erased to 0.30 mm (0.012 in.). Data recovery electronics include a low-level read amplifier, differentiator, zero-crossing detector, and digitizing circuits. All data decoding is provided by the adapter card. The Drive is also supplied with the following sensor systems: (I) A track 00 switch which senses when the Head/Carriage assembly is positioned at Track 00. (2) The index sensor, which consists of a LED light source and phototransistor, is positioned such that when an index hole is ,.-......, detected, a sigital signal is generated. 2-110
- Page 78 and 79: Bit 5 When on, this bit will change
- Page 80 and 81: I/O Address and Bit Map Read/Write
- Page 82 and 83: Color/Graphics Monitor Adapter Auxi
- Page 84 and 85: Parallel Printer Adapter The Printe
- Page 86 and 87: Programming Considerations The Prin
- Page 88 and 89: Parallel Printer Adapter Interface
- Page 90 and 91: Table 7. Printer Specifications (1
- Page 92 and 93: Table 9. Functions and Conditions o
- Page 94 and 95: Table 10. Connector Pin Assignment
- Page 96 and 97: (4) Data transfer sequence Fig. 17
- Page 98 and 99: ASCII Control Codes Control Codes V
- Page 100 and 101: (8) DC 2 (Device Control 2) The DC
- Page 102 and 103: (b) 3) ESC 2 (Escape 2) Receipt of
- Page 104 and 105: ehaves like the LF code. Therefore,
- Page 106 and 107: [DATA] IESCGI ABCDEFGHI [PRINT] ABC
- Page 108 and 109: 5 1/4-Inch Diskette Drive Adapter T
- Page 110 and 111: ~ Functional Description From a pro
- Page 112 and 113: The FOe is capable of performing 15
- Page 114 and 115: Table 13. Symbol Descriptions (cont
- Page 116 and 117: Command Summary (continued) DATA B
- Page 118 and 119: Command Summary (continued) DATA B
- Page 120 and 121: Table 15. Status Register I BIT NO.
- Page 122 and 123: Table 17. Status Register 3 BIT NO.
- Page 124 and 125: ~ ~ +AO-9 +AEN -lOW -lOR -DACK2 +T
- Page 126 and 127: Adapter Inputs -Index -Write Protec
- Page 130 and 131: (3) The write-protect sensor disabl
- Page 132 and 133: Memory Expansion Options Two Memory
- Page 134 and 135: Switch - Configurable Start Address
- Page 136 and 137: Game Control Adapter The Game Co
- Page 138 and 139: I/O Channel Description A9-AO: D7-D
- Page 140 and 141: ) ) ) 15 PIN MALE '0' SHELL c....t
- Page 142 and 143: Asynchronous Communications Adapter
- Page 144 and 145: Modes of Operation The different mo
- Page 146 and 147: I TRANSMIT 'IACUIT I +5V ~ 4S-"l Tx
- Page 148 and 149: INS8250 Functional Pin Description
- Page 150 and 151: Data Set Ready (DSR), Pin 37: When
- Page 152 and 153: Input/Output Signals Data (D7-DO) B
- Page 154 and 155: Bit 3: This bit is the Parity Enabl
- Page 156 and 157: Table 23. BAUD RATE AT 1.843 Mhz De
- Page 158 and 159: Interrupt Identification Register T
- Page 160 and 161: Interrupt Enable Register This 8-bi
- Page 162 and 163: In the diagnostic mode, the receive
- Page 164 and 165: Transmitter Holding Register The T
- Page 166 and 167: Asynchronous Communications Adapter
- Page 168 and 169: SECTION 3. ROM and SYSTEM r", USAGE
- Page 170 and 171: MOV AH,l ;function is to set time o
- Page 172 and 173: Vectors With Special Meanings Inter
- Page 174 and 175: BIOS Memory Map STARTING ADDRESS H
- Page 176 and 177: The timer is set mode 3 which means
5-1/4" Diskette Drive Adapter<br />
External Interface Specifications<br />
REAR PANEL<br />
37 PIN '0' SHELL<br />
CONNECTOR<br />
o<br />
1 • • 20<br />
• •<br />
• •<br />
• •<br />
• • 37<br />
o<br />
AT STANDARD TTL LEVELS<br />
Pin no.<br />
Unused<br />
1 ·5 <br />
Index 6 ..<br />
I... Motor Enable C 7<br />
1""1"<br />
I...<br />
....<br />
Drive Select 0 8<br />
... Drive Select C 9<br />
I""'"<br />
-<br />
.....<br />
Motor Enable 0 10<br />
I... Direction (Stepper Motod 11<br />
External .....<br />
5%" Diskette<br />
Drives ... Step Pulse 12 Drive<br />
....<br />
Adapter<br />
... Select Head 1 13<br />
~<br />
Write Enable 14<br />
...<br />
-<br />
....<br />
Track 0 15 Write Protect 16 Read Data 17 ..<br />
~-..<br />
Write Data 18<br />
Ground 20·37<br />
..<br />
2-109
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