Sending 0377 via KL8JA

[Johnny Billquist]

This sounds like a typical TCP/IP telnet issue.

The telnet protocol (there actually is one) requires that all 377(8) be 
doubled. More properly I should perhaps say the NVT protocol used by telnet.

	Johnny

On 2015-01-19 06:39, Kyle Owen wrote:
> I am noticing something odd in SimH when sending a 0377 (all ones)
> character. It seems to be duplicating the byte. I haven't read anything
> regarding this behavior. I'm away from my hardware PDP-8 at the moment, so
> I can't confirm that this is not the behavior that I would experience on
> the real thing.
>
> Here's how I reproduced it:
>
> test.pal:
>          *200
>          CLA OSR
>          JMS SEND
>          JMP 200
> SEND,   0
>          6416
>          6411
>          JMP .-1
>          CLA
>          JMP I SEND
>          $
>
> pdp8.ini:
> at ttix 2222
> set ttox0 8b
> load test.bin
> br 200
> d sr 0377
>
> Run 'nc localhost 2222 | od -to1' in a terminal, then 'go 200' and
> repeatedly press 'c', seeing how many times it takes to generate a line of
> characters in 'od'. Then, 'd sr 0376' and confirm that it takes twice as
> many presses, indicating half as many characters being sent per TLS
> instruction with the latter.
>
> Can anyone else confirm this for me?
>
> Thanks,
>
> Kyle
>


-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol