110 Baud USB to Serial Converter?

General discussions related to the Altair 8800 Clone

110 Baud USB to Serial Converter?

Postby toml_12953 » September 26th, 2015, 7:18 am

I just got a Raspberry Pi and can run my Teletype off it using its built-in serial port and an external serial to current loop converter. The Pi can also use USB to serial converters and I could add a powered USB hub to run ten terminals or more off it. Can you imagine ten terminals run by a $30.00 device? The TTY will be the limiting factor as far as speed goes. The only problem is that most USB-serial adapters are based on an FTDI chip that has a lower limit of 300 baud. The Teletype runs at a fixed 110 baud. Does anyone know of a USB-serial adapter that works at 110 baud?
I've successfully run three terminals on the Pi (one TTY, one ADM5 at 9600 baud and a 300 baud terminal emulator on a PC) and it's quite a sight. If I could run multiple TTYs, I could recreate a minicomputer room of the 60's and 70's with just a Pi! Woo hoo!
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Re: 110 Baud USB to Serial Converter?

Postby AltairClone » September 26th, 2015, 7:53 am

I use serial converters based on the Prolific chip set and they work with a Teletype at 110 baud. However, something in the driver/buffering logic fails if you try to send an entire file (e.g., Altair BASIC) to an Altair at 110 baud or 300 baud. However, on the Pi, it will use the Linux version of the driver instead of the Windows version, so operation may differ.

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