[Simh] Way out idea for simh

[Veit, Holger]

Am 20.04.2016 um 22:35 schrieb Sampsa Laine:
>> On 20 Apr 2016, at 23:25, Phil Budne <phil at 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:
>
> 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".

Holger