Re: Has anyone built the hardware for Zimodem?

I am not sure what bo offers source wise for his hardware but there is
eagle files for the Strikelink WiFi board at

1200baud.wordpress.com

You could get them printed cheap from elecrow. Then you just need nodemcu
esp8266 modules and user port plugs and a soldering iron. Less than $10 in
parts

On Jan 5, 2018 11:56 AM, "Ethan Dicks" <ethan.dicks@gmail.com> wrote:

> Hi, All (but especially, Bo)
>
> I was looking at fiddling with a WiFi modem project this year and it
> didn't take long to discover Zimodem.
>
>
> https://github.com/bozimmerman/Zimodem
>
> The source is all there, there's a good summary of the command set,
> but what I could not find was anything to do with construction.  I
> know how C-64 RS-232 works and can go through the sources to figure
> out what pins are what pins, but this will be my first ESP8266 project
> and beyond knowing about 3.3V PSU and I/O, I'd like to start with the
> benefit of anybody's experience with this build.  In particular, since
> one of my targets is the C-64 (and eventually the 8032) I'm going to
> start with a CBM edge connector rather than a full DB-25 RS-232
> interface and I'd like to know about what inexpensive options work for
> 3.3V<->5V level converters.  It's low-speed, so I would _think_ that
> simple passive voltage dividers would be fast enough vs IC-based level
> shifters, but I'd like to hear that from someone that has done it.
>
> My eventual plan is to come up with an inexpensive build list to make
> construction a small pile of these affordable to be able to take them
> to a vintage computing event (like VCF Midwest) and loan them out and
> not worry if they don't come back.  The point being to allow anyone
> present to connect to an on-site BBS during the event.
>
> Thanks for any suggestions.
>
> -ethan
>
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>


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