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IBM 2780 Manuals
Manuals and User Guides for IBM 2780. We have
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IBM 2780 manual available for free PDF download: Reference Manual
IBM 2780 Reference Manual (87 pages)
Data Transmission Terminal Component Description
Brand:
IBM
| Category:
Computer Hardware
| Size: 5 MB
Table of Contents
Table of Contents
4
2780 Models
7
Functional Units of the 2780
7
Terminology
7
Communications Facilities
7
Code Structures
9
Card Read/Punch
9
Basic Operation--Card Read/Punch
10
Reader and Punch Checking
16
Buffers and Control Circuitry
18
Line Buffer
18
I/O Buffer
18
Buffer Operation
19
Buffer Checking
20
Printer
20
Character Sets
20
Tape-Controlled Carriage
21
Carriage-Control Tape
22
Paper Forms
24
Carriage Controls and Switches
24
Component Selection, Basic Terminal (Contention)
26
DATA-Llnk and END-TO-END CONTROL CHARACTERS
29
Data-Link Control Characters
29
ENQ (Enquiry)
29
STX (Start of Text)
29
ETX (End of Text)
29
DLE (Data-Link Escape)
30
RVI (Reverse Interrupt)
30
NAK (Negative Acknowledgment)
31
WACK (Wait before Transmit-Positive Acknow Ledgment)
31
EOT (End of Transmission)
31
End-To-End Control Characters
31
ESC (Escape)
31
HT (Horizontal Tab)
32
EM (End of Media)
32
BEL (Bell)
33
SUB (Substitute)
34
DEL (Delete)
34
Transmission Checking
34
Redundancy Check
34
Format Check
36
Odd/Even Blockcotmt
36
I/O and Buffer Check
37
Timeout Controls
37
One-Second Timeout
38
Two-Second Timeout
38
Three-Second Timeout
38
Extended ENQ Retry Feature (48-Second Timeout)
38
Standard 2780 Operation
38
2780 Operation with Extended Enquiry Retry
38
Operator Controls
39
Switches
39
Indicator Lights
41
Indicator Lights
44
Printer Controls
45
Special Features
47
Multipoint Line Control
47
Polling
47
Responses to Polling
47
Synchronous Clock
48
EBCDIC Transparency
51
Auto Turnaround
52
Terminal Identification
52
120-Character Print Line
53
Selective Character Set
53
EBCDIC Code
53
Six-Bit Transcode
53
USASCII Code
53
Basic Line Control
55
Enq
55
Ibm 2780 Data-Link Control Format
55
Serializer Synchronization
55
Format, Responding to Transmission of Test
55
Format, EOT Response or Incomplete Transmission
56
Format, Extor Conditions
56
Format, Retransmission
57
Operating Procedures
59
OFF-LINE OPERATION (MODELS 1 and 2 Only)
59
Transmit Operation (Models 1, 2, and 4)
59
Normal Stops (Punch Operation)
59
Alternate Transmitting and Receiving
60
Error-Recovery Procedures
63
Summary of Responses to Extors
63
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