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ZMODEM

en.wikipedia.org

21–30 of 103 posts

Re: ZMODEM

#21

> Introduced 1986; 30 years ago Now I feel old. I remember when this was new and clever. Made downloading from BBS's much nicer over XModem. At 2400 baud or whatever was current then!

I was 12 years old. I had a 2400 baud and ZModem was the second greatest thing that year. Watching Haley's comet on my birthday would be #1.

Re: ZMODEM

#23
This immediately reminded me of GIFLink.

It was a layer over protocols like zmodem that rendered images as they downloaded. Think of that for a second. Modems were so slow that you could watch the image line by line render to decide if you wanted to continue on with the download. Yes they were porn images.

Re: ZMODEM

#24
post #9

Kermit was in the same space as Zmodem. I remember it fondly, as they were very progressive around "open source" way back in the early 90's, and probably earlier. They accepted what was essentially a "pull request" over USENET discussions forums from me to add a feature. http://www.kermitproject.org/ckfaq.html

That's pretty cool, what feature did you add?

Basically a toggle to turn off character set translation for rlogin sessions, to get past an issue with network connected modems.

Re: ZMODEM

#25
It's still hard to match the convenience of moving files to and from a server with RZ/SZ.

If your terminal emulator supports it, it will see the trigger sequence emitted and start the modem protocol over your ssh connection and save the file.

Since it runs over your current ssh connection it's perfectly secure.

It's so much easier then switching to a local terminal to use scp to get or put a local file. Sure, I know it's not the most efficient protocol but with the speed of todays networks the kind of files you're dealing with when doing administration or development are more quickly transferred by not having to do the context switch.

If there's a mac terminal that will do scp that has shell integration on the host. I'd switch to that, but I haven't found one. Is there?

Re: ZMODEM

#26
post #2

We used this in the BBS days.

Still use this today, it's what you do with an embedded device when all you have is a serial line and need to get files on/off. Slow as hell though, but then I didn't grow up with this stuff.

[deleted]

Re: ZMODEM

#27
post #9

Kermit was in the same space as Zmodem. I remember it fondly, as they were very progressive around "open source" way back in the early 90's, and probably earlier. They accepted what was essentially a "pull request" over USENET discussions forums from me to add a feature. http://www.kermitproject.org/ckfaq.html

Except they were never open. You could download the code, but you were not allowed to distribute modifications to it.

The project was cancelled in 2011, and according to the web page it's open source now, and I think that the open sourcing didn't happen until then.

Re: ZMODEM

#28
Looking b ack at stuff like Zmodem, it's instructive to compare the computing culture then and now. Back then, everything was so cryptic. Documentation was hard to find printed books, code and config was extremely abbreviated ( sometimes for legitimate technical reasons of storage capacity). It was all very off-putting unless you put w lot of effort into research, or ran in the social circles that already had data and knowledge.

Nowadays we have an embarassment of riches of information and community and expressiveness and usability (when the APIs aren't locked down by DRM and trade secrets)

Re: ZMODEM

#29

> Introduced 1986; 30 years ago Now I feel old. I remember when this was new and clever. Made downloading from BBS's much nicer over XModem. At 2400 baud or whatever was current then!

I was 12 years old. I had a 2400 baud and ZModem was the second greatest thing that year. Watching Haley's comet on my birthday would be #1.

Halley modems and Halley's comet!

Re: ZMODEM

#30

Earlier quoted context omitted.

Still use this today, it's what you do with an embedded device when all you have is a serial line and need to get files on/off. Slow as hell though, but then I didn't grow up with this stuff.

Screen[1] contains an implementation of zmodem (and is one of screen's advantages over tmux). I've used it before on VMs on which I had a serial console but no network connection or other way to get/put files. [1] - https://www.gnu.org/software/screen/

Very cool! I didn't realize screen had this. I've always used sz/rz when needed. It's kludgy but comes in handy every so often. I have it installed on all my linux boxes for that special occasion.
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