On 2016-04-20 22:35, Sampsa Laine wrote:
On 20 Apr 2016, at 23:25, Phil Budne <p...@ultimate.com> 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:
Actually, we should not assume the connection is lossless, so I would
stick with Kermit.
(There are examples of overflowing the serial port, resulting in lost
characters by simple buffer overruns.)
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
Add checksums to the packets, and this is pretty much what Kermit is.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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