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Unix programs supporting YMODEM are available on TeleGodzilla in RZSZ.ZOO.
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This ZOO archive includes a ZCOMM/Pro-YAM/PowerCom script ZUPL.T to upload
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a bootstrap program MINIRB.C, compile it, and then upload the rest of the
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files using the compiled MINIRB. Most Unix like systems are supported,
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including V7, Xenix, Sys III, 4.2 BSD, SYS V, Idris, Coherent, and
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Regulus.
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A version for VAX-VMS is available in VRBSB.SHQ.
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Irv Hoff has added 1k blocks and basic YMODEM batch transfers to the KMD
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and IMP series programs, which replace the XMODEM and MODEM7/MDM7xx series
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respectively. Overlays are available for a wide variety of CP/M systems.
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Questions about Professional-YAM communications software may be directed
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to:
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Chuck Forsberg
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Omen Technology Inc
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17505-V Sauvie Island Road
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Portland Oregon 97231
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VOICE: 503-621-3406 :VOICE
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Modem: 503-621-3746 Speed: 19200(Telebit PEP),2400,1200,300
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Usenet: ...!tektronix!reed!omen!caf
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CompuServe: 70007,2304
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GEnie: CAF
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Unlike ZMODEM and Kermit, XMODEM and YMODEM place obstacles in the path of
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a reliable high performance implementation, evidenced by poor reliability
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under stress of the industry leaders' XMODEM and YMODEM programs. Omen
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Technology provides consulting and other services to those wishing to
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implement XMODEM, YMODEM, and ZMODEM with state of the art features and
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reliability.
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Chapter 11 Xmodem Protocol Overview
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CONTENTS
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1. TOWER OF BABEL................................................... 2
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1.1 Definitions................................................. 2
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2. YMODEM MINIMUM REQUIREMENTS...................................... 4
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3. WHY YMODEM?...................................................... 5
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3.1 Some Messages from the Pioneer.............................. 6
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4. XMODEM PROTOCOL ENHANCEMENTS..................................... 9
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4.1 Graceful Abort.............................................. 9
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4.2 CRC-16 Option............................................... 9
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4.3 XMODEM-1k 1024 Byte Block................................... 10
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5. YMODEM Batch File Transmission................................... 12
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5.1 KMD/IMP Exceptions to YMODEM................................ 16
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6. YMODEM-g File Transmission....................................... 17
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7. XMODEM PROTOCOL OVERVIEW......................................... 18
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7.1 Definitions................................................. 18
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7.2 Transmission Medium Level Protocol.......................... 18
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7.3 File Level Protocol......................................... 19
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7.4 Programming Tips............................................ 20
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8. XMODEM/CRC Overview.............................................. 22
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8.1 CRC Calculation............................................. 22
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8.2 CRC File Level Protocol Changes............................. 23
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8.3 Data Flow Examples with CRC Option.......................... 25
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9. MORE INFORMATION................................................. 27
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9.1 TeleGodzilla Bulletin Board................................. 27
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9.2 Unix UUCP Access............................................ 27
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10. REVISIONS........................................................ 27
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11. YMODEM Programs.................................................. 28
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