IBM 5280 Technical Newsletter page 4

Attachments and Features . . . . . . . . . . • . • . . . • . . . . • 243
Diskette Drives • . • . . • . . • . . . • . . • . . . . • 243
Printers. . . . . . . . . . • . . . 243
Keylock Feature . . . . . . . . . . . . . . . . . • . 243
Magnetic Stripe Reader Feature. . . . . • . . .. 244
Elapsed Time Counter Feature . . . • .. 244
Feature Main MPU . . . . . • . . •• . . . . . . . • . . . . 244
Communications Feature . . . . . . . . . . .• 244
SYSTEM FUNCTIONAL OVERVIEW . . . . . . . . • . • . . . . 245
Loading a ~rogram . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Executing a Program . . . . . . . . . • • 246
I/O Instructions. . . . . . . • . 246
Partition Pointers • .
Partition lOB . . . .
Device MPUs . . . . . . .
Keyboard/Display lOB.
Indicators and Registers
Partition Work Area . .
SYSTEM LOGIC OVERVIEW .
MAIN STORAGE ACCESSING.
Storage Access Example . . . . .
KEYBOARD/DISPLAY ATTACHMENT
Keyboard/Display MPU
Keyboard Adapter . . • . . . . . . . .
Display Adapter. . .. . . . . . . . . .
Keyboard/Display MPU I/O Registers
Keyboard/Display Data Flow . . .
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247
247
248
248
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249
250
251
252
253
253
253
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254
Function Keys. . . . . . . . . 255
Command Key Sequence. . . . • . . . . . . . . . • . . 255
Keyboard/Display Storage. . . . . . . . . . . • . . . . . . 256
Keyboard/Display Storage Addressing • . 256
Accessing Keyboard/Display Storage. . . . . . • . . . . . 257
Keyboard . . • . . . . . . . . . . . . . . . 257
Magnetic Stripe Reader. . . . . . . . . . • . . . . . . . • . . . 257
Elapsed Time Counter . . . . . . . . . . . . . . . . . . . . . • . • 258
Buffer Timer. .. .. .. . . . . . . . . . 258
DISKETTE ATTACHMENT. . • . . . . . 259
Diskette MPU . . . . . . . . . . . . . . . . 259
Diskette lOB Pointers and lOBs. . . . .. . . . . . . . 260
Diskette Adapter . . . . . . . . . . . •
Diskette MPU to Adapter Commands
Write/Read Check Command . . .
Seek Command • . . . • . . . . • .
Recalibrate Seek • . . .
Read I D Command . . .
Read Data Command. .
Write Data Command ..
Write 10 Command. . .
Write Control Data Command. . .
Set Mode/Select Command • . . .
Read Diagnostic Command . . . .
Inhibit Control Data AM Command
Set Ready Command. . . . . . . .
Reset Access Counter Command .
Diskette Adapter Registers ..
Sense Register 1 .
Sense Register 2. . . . . .
Sense Register 3. . . . . . .
Command Register . . . . .
Drive Configuration Register
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261
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261
262
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. . . . . . . . . . • . . ,266
Page of SY31-0600-1
As updated January 30, 1981
By TN L SN20-9543
PRINTER ATTACHMENT . . .
Printer MPU . . . . .
Printer Adapter .. .
Driver /Receivers.
Timing Logic •.
Port Control Logic . . . . . .
Transmit Data Multiplexor.
Receive Data Multiplexor . . .
Serdes . . . . . . .
Control Logic . . . . . . . . . .
Example Operation. . . . .
Printer Adapter Commands ..
Transmit Commands . . . .
Receive Commands. . . . .
Reset and Diagnostic Commands .
Printer Addressing ..
16-Bit Frame Concept .. .
Bi-Phase Encoding .. .
Transmission Sequence.
Printer Commands . . .
Poll Response Frames from the Printer. .
COMMUNICATIONS ATTACHMENT . . . .
Typical Operation . . . . . . . . . . . . . . . .
Operation Examples . . . . . . . . . . . . . .
Communications MPU Commands and Responses
Communications MPU to Adapter Registers ..
Transmit Data Register . . . . . .
Command Register . . . . . .
Command Return Register ..
Receive Status Register . . . .
Receive Data Register .. .
Diagnostic Register . . . • .
Transmit Status Register ..
Diagnostic Return Register
Network Configuration Register
DCE Control Return Register ..
Timer Register. . . . . . . .
Li ne Adapter Cards. . . . . . . . . . . .
38 LS I ntegrated Modem .'. . . . . .
Switched Network Connections . . .
Nonswitched Network Connections
Communications Facilities Characteristics . . . . .
Call and Answer Sequences . . . . . . . . . .
i~-
• •
38LS for WT Switched Networks (PSN Adapter) .
Line Plate Operating Modes . . . . . • . . .
Communications Facilities Characteristics . . . .
Voltage Surge Protection. . . . . . • . .
Digital Data Service Adapter.
EIA/CCITT . . . . ' . . . . . .
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292
296
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299
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304
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310
Line Protocols. . . . . . . . . . . . . . . • . 314
Binary Synchronous Communications (BSC) . . . . . . • • . 314
BSC Control Characters . . . . . . . . . . . . . • . . . . 314
Synchronization Initiating and Terminating Sequences •.. 316
Control Sequences . . . . . . . . . . . . . . . . . . . . . . . . 318
Transparent Data . . . . . . . . . . . . . . . . . . . . . . . . . 321
Differences Between IBM 3741 Mode and IBM 3780 Mode. 321
Synchronous Data Link Control . . . . . . .
Commands and Responses . . . . . . . . . .
Commands and Responses Not Supported ..
322
324
325
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