RCA 70/668 Manuals

Manuals and User Guides for RCA 70/668. We have 1 RCA 70/668 manual available for free PDF download: Reference Manual

RCA 70/668 Reference Manual

RCA 70/668 Reference Manual (130 pages)

Spectra 70 Communication Controller-Multichannel (CCM) Communication Buffers

Brand: RCA | Category: Computer Hardware | Size: 5.61 MB

Table of Contents

Table of Contents
3
General Description
7
Communication Controller- Multichannel
7
- Buffer Scan
  9
- CCM Device Addresses
  11
- Coordination Message Line (CML)
  11
Operational Characteristics
12
- Operational Words (Ows)
  12
Processor-CCM Control
12
Data Transfer
16
- Channel Coordination
  17
- Figure 1-2. Generation of OW Address
  18
- Service Requests
  20
- Processor Scan
  21
- To Buffer
  23
- Asynchronous Data Transfer from Processor to Buffer
  23
- Data Accuracy Control
  23
- Code Modification
  23
- Data Timeout
  24
- Detection of Pause and Break
  24
Program Notification
25
- Interrupts
  25
- Coordination Messages (CM)
  26
- CCM Initiated
  26
- Processor Initiated
  27
Initialization
27
CCM Memory Readout
28
CCM Initialization Considerations
29
- Figure 2-1. Loading of Line Status Words
  30
- Delete Characters as Ows
  31
OW Construction Example Number 1 (83-B-X)
33
Reference Information
45
Standard Device Byte
45
Table 3-1. Standard Device Byte
45
Conditions Requiring Access of Standard Device Byte
46
Sequential Modification of USASCII to Extended USASCII
46
Table 3-2. Conditions Requiring Access of Standard Device Byte
46
Sequential Modification of IBM 1050 Code
47
Transmission
48
Sequential Modification of Teletypewriter Baudot Code Transmission
48
System Functional Capability
49
Schematic Appearance of CCM Memory Layout
49
Table 3-3. Remote System Functional Capability
50
Figure 3-1. Schematic Appearance of CCM Memory Layout
54
Line Status Words Layout
55
Table 3-4. Line Status Words (LSW)
56
Table 3-5. Operational Words
61
Communication Reporting Byte
63
- Table 3-6. Operational Words OW-2
  63
- Buffer Capacity
  64
- Physical Characteristics
  64
- Buffer Identification
  65
- Controls and Indicators
  65
  - Features
    65
Communication Buffers
67
CCM - Buffer Sequence
67
- Select
  67
- Buffer Responses
  67
  - CCM Responses
    67
Reports
69
Causes of MR, ER, and LDR Reports
71
Data Set, ACU, and VRU Signal Reference List
72
70/710 Telegraph Buffer
74
Table 4-1. Model 70/710 Remote Device Characteristics
76
70/715 Parallel Buffer
77
Figure 4-1. Parallel Buffer Data Flow
78
70/720 Asynchronous Data Set Buffer
81
70/721 Synchronous Data Set Buffer
90
70/722 Synchronous Transmitter-Receiver Buffer
97
70/724 EDGE Demodulator/Buffer
104
70/725 Data Gathering System Buffer
105
70/780 Time Generator/Buffer
110

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