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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