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30864re: [midatlanticretro] Retro WiFi

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  • Mike Loewen
    May 20, 2013
      On Mon, 20 May 2013, B. Degnan wrote:

      > -------- Original Message --------
      >> From: "Mike Loewen" <mloewen@...>
      >> Sent: Sunday, May 19, 2013 10:01 PM
      >> To: midatlanticretro@yahoogroups.com
      >> Subject: [midatlanticretro] Retro WiFi
      >> A few weeks ago, we were speculating on the possibility of using a
      >> Raspberry Pi, a serial level shifter and a USB wireless dongle to get
      >> vintage systems online. I'm happy to report that the proof of concept is
      >> successful. I'm typing this on a stock TRS-80 Model 4P, running IMP 2.45
      >> under Montezuma Micro CP/M. There are some problems to be worked out, as
      >> I'm seeing some weird echo effects, despite the serial setting being
      >> correct. I'll update the group as I continue testing. With this
      >> configuration, it's also possible to connect via 100BaseT.
      > Wow sounds like fun. I don't have a serial level shifter. What is that?
      > I have the Pi and TRS 80 Model 4P with Mont CP/M would love to try this. I
      > think I am running a Debian on my RasPI, MAME stuff.

      I opted for a 6-wire level shifter, in order to play with RTS/CTS flow
      control. I used this one, based on a SP3232 chip:

      Ebay 271036807405

      Run it off the 3.3V supply pin. You can solder headers to the Raspi
      2.0 board to get access to RTS and CTS.

      The wireless adapter is an Edimax EW-7811un. Don't skimp on the power
      supply for the Pi - get a 2A supply such as used for the Nexus 7 tablet.
      Underpowered supplies will give you no end of grief.

      Mike Loewen mloewen@...
      Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/
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