On 2016-04-21 10:01, Veit, Holger wrote:
Am 20.04.2016 um 22:35 schrieb Sampsa Laine:
On 20 Apr 2016, at 23:25, Phil Budne <[email protected]> wrote:
Ken.Cornetet wrote:
I guess I need to shout this:
******* KERMIT DOES NOT WORK ON SIMH EMULATED RTE-6/VM ********
Why not?
Kermit does not exist (and probably couldn't feasibly exist) on any
earlier versions of RTE.
Again, why not?
Having just written a new shell for PDP-7 UNIX (because the original
could not be found), I can't imagine much other than a lack of
something resembling a serial console that would prevent _some_
version/subset of KERMIT (or something similar like X or ZMODEM) from
being cobbled together.
And since the connection can be assumed to be lossless, the protocol
could be really simple, e.g. something like this:
G=Guest, H=Host
Example of a write operation..
G: WRITE-FILE
H: ACK
// Now we send the file structure / word size etc
G: FILE-META-DATA
G: <file size and a bunch of OS specific stuff that is written to a
second file>
H: ACK
G: FILE-DATA
G: <the actual data>
G: ACK
Done.
And this is just a non-formalized textual description of how FTP, or
ZMODEM, or Kermit work. The fine print is in the "Now we send the file
structure / word size etc".
I wouldn't go that far. FTP does not really work that way, unless you
have a very loose definition of TCP and FTP. And I don't know much about
XMODEM, but yes, this is a pretty close description of how KERMIT works.
Johnny
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