thanks for looking at that John.
Yes, motivation is for CP/M and large files.  I believe I can get TPDD
protocol to run on the BCR TTL port since it is half duplex and limited in
response message size to 128 bytes + a few.

I'm eager to try it out and see how far I can push it.

..Steve

On Mon, Apr 20, 2020 at 4:07 PM John R. Hogerhuis <jho...@pobox.com> wrote:

> I'd have to add it. For large files like you're testing with it could make
> a difference.
>
> I've never bothered with higher rates because TS-DOS doesn't support it
> and the main problem with speed of TPDD protocol is the request/response
> nature of the protocol, small message size, and the fact that directory
> enumeration is done one filename at a time.
>
> I think just packing all directory entries into one message would make a
> massive speedup. Ken was working on a feature for NEWDOS/NADSBox but as of
> recent discussions it was in progress.
>
> -- John.
>
>>

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