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If the receiver detects an illegal or badly formed command, the
receiver immediately responds with a ZCOMPL header with an error
code in ZP0...ZP3.
If ZF0 contained ZZZZCCCCAAAACCCCKKKK1111,,,, the receiver immediately responds with a
ZCOMPL header with 0 status.
Otherwise, the receiver responds with a ZCOMPL header when the
operation is completed. The exit status of the completed command is
stored in ZP0...ZP3. A 0 exit status implies nominal completion of
the command.
If the command causes a file to be transmitted, the command sender
will see a ZRQINIT frame from the other computer attempting to send
data.
The sender examines ZF0 of the received ZRQINIT header to verify it
is not an echo of its own ZRQINIT header. It is illegal for the
sending program to command the receiving program to send a command.
If the receiver program does not implement command downloading, it
may display the command to the standard error output, then return a
ZCOMPL header.
12. SSSSEEEESSSSSSSSIIIIOOOONNNN TTTTRRRRAAAANNNNSSSSAAAACCCCTTTTIIIIOOOONNNN EEEEXXXXAAAAMMMMPPPPLLLLEEEESSSS
12.1 AAAA ssssiiiimmmmpppplllleeee ffffiiiilllleeee ttttrrrraaaannnnssssffffeeeerrrr
A simple transaction, one file, no errors, no CHALLENGE, overlapped
I/O:
Sender Receiver
"rz\r"
ZRQINIT(0)
ZRINIT
ZFILE
ZRPOS
ZDATA data ...
ZEOF
ZRINIT
ZFIN
ZFIN
OO
Chapter 12 Rev 10-27-87 Typeset 10-27-87 30
Chapter 12 ZMODEM Protocol 31
12.2 CCCChhhhaaaalllllllleeeennnnggggeeee aaaannnndddd CCCCoooommmmmmmmaaaannnndddd DDDDoooowwwwnnnnllllooooaaaadddd
Sender Receiver
"rz\r"
ZRQINIT(ZCOMMAND)
ZCHALLENGE(random-number)
ZACK(same-number)
ZRINIT
ZCOMMAND, ZDATA
(Performs Command)
ZCOMPL
ZFIN
ZFIN
OO
13. ZZZZFFFFIIIILLLLEEEE FFFFRRRRAAAAMMMMEEEE FFFFIIIILLLLEEEE IIIINNNNFFFFOOOORRRRMMMMAAAATTTTIIIIOOOONNNN
ZMODEM sends the same file information with the ZZZZFFFFIIIILLLLEEEE frame data
that YMODEM Batch sends in its block 0. NNNN....BBBB....:::: TTTThhhheeee ppppaaaatttthhhhnnnnaaaammmmeeee ((((ffffiiiilllleeee
nnnnaaaammmmeeee)))) ffffiiiieeeelllldddd iiiissss mmmmaaaannnnddddaaaattttoooorrrryyyy....
PPPPaaaatttthhhhnnnnaaaammmmeeee The pathname (conventionally, the file name) is sent as a
null terminated ASCII string. This is the filename format used
by the handle oriented MSDOS(TM) functions and C library fopen
functions. An assembly language example follows:
DB 'foo.bar',0
No spaces are included in the pathname. Normally only the file
name stem (no directory prefix) is transmitted unless the
sender has selected YAM's ffff option to send the ffffuuuullllllll absolute or
relative pathname. The source drive designator (A:, B:, etc.)