> On 21 Apr 2016, at 01:05, Johnny Billquist <b...@softjar.se> wrote: > > 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.) > > Add checksums to the packets, and this is pretty much what Kermit is.
Agreed, add a checksum and the built-in SIMH file server sends a NAK if it didn’t like a packet. Each packet is let’s say X bytes + checksum. I think the generic simple file server should be fairly simple to write and the guest OS tools relatively portable, you just have to change the writing/reading of the metadata for each guest OS. Of course you only implement this for simulations where Kermit is not an option.. Sampsa
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