IBM 5280 Technical Newsletter page 151

Data Stations
IBM 5281
IBM 5282
. . . . . . • • . . . • 239
Programmable Units
IBM 5285
'SM 5286 . . . .
IBM 5288 . . . .
Attachments and Features.
Diskette Drives . . . . . . .
Printers . . . . . . . . . . . .
Keylock Feature . . . . . .
IBM 3270 Emulation. . . . . . .
Magnetic Stripe Reader Feature.
239
239
240
240
. . . . 241
. •.• 242
243
243
. . . . . . .. 243
243
244
244
Elapsed Time Counter Feature . . . . . . . 244
Feature Main MPU . . . . . . . . . . 244
Communications Feature . . . . . . 244
SYSTEM FUNCTIONAL OVERVIEW. . . . . . . 245
Loading a Program . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . .
Function Keys . . . . . . .
Command Key Sequence . . . . . .
Keyboard/Display Storage . . . . . . .
Keyboard/Display Storage Addressing ..
Accessing Keyboard/Display Storage.
Keyboard . . . . . . . . .
Magnetic Stripe Reader . . . . . . . . . . .
Elapsed Time Counter . . . . . . . . . .
Buffer Timer. . . . . . . . . . . . . . . .
DISKETTE ATTACHMENT .. .
Diskette MPU . . . . . . . . . . .
Diskette lOB Pointers and lOBs.
Diskette Adapter . . . . . . . . .
Diskette MPU to Adapter Commands
Write/Read Check Command
Seek Command . . .
Recal ibrate Seek . . .
Read I D Command . . .
Read Data Command.
Write Data Command ..
Write I D 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.
246
247
247
248
248
248
249
250
251
252
253
253
253
253
254
255
255
256
256
257
257
.257
. 258
. . . . • 258
259
259
260
261
261
261
261
262
262
263
263
264
264
264
264
264
264
264
264
265
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265
Page of SY31-0600-1
As updated September 7, 1981
By TN L SN20-9656
Command Register . . . . . . . .
Drive Configuration Register ..
PRINTER ATTACHMENT ..
Printer Attachment MPU . • . .
Twinaxial Printer Adapter.
Start-Stop Printer Adapter.
Twinaxial Printer Attachment.
Driver/Receivers ••.
Timing Logic . . . . , . . .
Port Control Logic . . . . .
Transmit Data Multiplexor.
Receive Data Multiplexor
Serdes . . . • . . . . • . . .
Control Logic . . . . . . . .
Example Operation of the Twinaxial Printer
Attachment . . . . . . . . . • . . . . . . . .
Twinaxial Printer Adapter Commands . . • .
Transmit Commands . • . . . . . . . . .
Receive Commands. . . . . . . . .
Reset and Diagnostic Commands . . . .
Twinaxial Printer Addressing . . . . . • . .
Twinaxial Printer Attachment 16-Bit Frame
Concept • . . . . • . . . .
Bi-Phase Encoding . . . . . . . . . . . .
Transmission Sequence . . . . . . . . . .
Twinaxial Printer Interface Commands.
Poll Response Frames from the Printer.
Start-5top Printer Attachment .
Drivers/Receivers . . . . . . .
Timing and Control Logic . .
Port Control Logic . • • . . .
Serdes • . . . . . . . . . . . .
Start-5top Adapter Example Operation
Start-Stop Printer Adapter Commands.
Transmit Commands . . . .
Receive Commands. . . . . . . . . .
Special Control Commands . . . . .
Start-Stop Printer I nterface Commands
Start-Stop Printer Addressing . . . . . . . . .
Start-Stop Printer Attachment 11-Bit Frame
Concept . . . . . . . .
Start-Stop Encoding
Status Byte . . . . .
Sense Bytes . . . . .
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
DeE Control Return Register.
Timer 8egister . . . . . . .
Line Adapter Cards. . . . . . . . .
38 LS I ntegrated Modem . . . .
Switched Network Connections.
Nonswitched Network Connections .
Communications Facilities Characteristics.
Call and Answer Sequences . . . . . . . . . . . . . . . . . .
266
266
267
268
268
268
269
269
269
269
269
269
269
269
269
270
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271
271
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271
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274
274.3
274.3
274.3
274.3
274.3
274.3
274.4
274.4
274.5
274.5
274.5
274.7
274.7
274.7
274.8
274.8
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279
284
286
286
287
287
287
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287
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287
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287
287
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