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Chapter 23 Rev 10-27-87 Typeset 10-27-87 46 |
CONTENTS |
1. INTENDED AUDIENCE................................................ 2 |
2. WHY DEVELOP ZMODEM?.............................................. 2 |
3. ZMODEM Protocol Design Criteria.................................. 4 |
3.1 Ease of Use............................................... 4 |
3.2 Throughput................................................ 5 |
3.3 Integrity and Robustness.................................. 6 |
3.4 Ease of Implementation.................................... 6 |
4. EVOLUTION OF ZMODEM.............................................. 7 |
5. ROSETTA STONE.................................................... 10 |
6. ZMODEM REQUIREMENTS.............................................. 10 |
6.1 File Contents............................................. 10 |
7. ZMODEM BASICS.................................................... 12 |
7.1 Packetization............................................. 12 |
7.2 Link Escape Encoding...................................... 12 |
7.3 Header.................................................... 13 |
7.4 Binary Data Subpackets.................................... 16 |
7.5 ASCII Encoded Data Subpacket.............................. 16 |
8. PROTOCOL TRANSACTION OVERVIEW.................................... 16 |
8.1 Session Startup........................................... 16 |
8.2 File Transmission......................................... 18 |
8.3 Session Cleanup........................................... 20 |
8.4 Session Abort Sequence.................................... 20 |
9. STREAMING TECHNIQUES / ERROR RECOVERY............................ 21 |
9.1 Full Streaming with Sampling.............................. 21 |
9.2 Full Streaming with Reverse Interrupt..................... 23 |
9.3 Full Streaming with Sliding Window........................ 23 |
9.4 Full Streaming over Error Free Channels................... 24 |
9.5 Segmented Streaming....................................... 24 |
10. ATTENTION SEQUENCE............................................... 24 |
11. FRAME TYPES...................................................... 25 |
11.1 ZRQINIT................................................... 25 |
11.2 ZRINIT.................................................... 25 |
11.3 ZSINIT.................................................... 25 |
11.4 ZACK...................................................... 26 |
11.5 ZFILE..................................................... 26 |
11.6 ZSKIP..................................................... 28 |
11.7 ZNAK...................................................... 28 |
11.8 ZABORT.................................................... 28 |
- i - |
11.9 ZFIN...................................................... 28 |
11.10 ZRPOS..................................................... 28 |
11.11 ZDATA..................................................... 29 |
11.12 ZEOF...................................................... 29 |
11.13 ZFERR..................................................... 29 |
11.14 ZCRC...................................................... 29 |
11.15 ZCHALLENGE................................................ 29 |
11.16 ZCOMPL.................................................... 29 |
11.17 ZCAN...................................................... 29 |
11.18 ZFREECNT.................................................. 29 |
11.19 ZCOMMAND.................................................. 29 |
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