[vcf-midatlantic] Looking for a TI Silent 707 1200baud for the VCF Museum

Joseph Oprysko joprysko1 at gmail.com
Fri Oct 14 20:15:37 EDT 2016

I still think if you hook up a modem that does auto-answer (and you can
turn off the audio as well), and using a phone line simulator, it would
work just as well, plus, likely since the modems do some buffering, it's
likely to be able to catch up without dropping characters.

On Fri, Oct 14, 2016 at 2:30 PM, Jameel Akari via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> On Fri, 14 Oct 2016, David Williams via vcf-midatlantic wrote:
> On 14/10/2016 15:00, Neil Cherry wrote:
>>>  On 10/14/2016 09:46 AM, David Williams via vcf-midatlantic wrote:
>>> >  Just tried dumping a text file to my 703 at 1200 baud and you're
>>> right, >  after about 500
>>> >  characters or so, it can't keep up with the input. Is there any way
>>> to >  put a delay after
>>> >  characters / line on Simh? I tested again by dumping the same text
>>> file >  via TeraTerm using
>>> >  a 15ms delay per character and 350ms per line and it seemed to work
>>> >  fine.
>>>  Don't the RS232 control leads take care of this?
>>> They should but I don't believe they are present of the RPi board
> They sort of exist on GPIO #30 and #31, but their use is not standard, and
> your typical level shifter only does TX/RX.  I just went through this on a
> recent project with a RPi connected to an (actual) VT100 -- Couldn't go
> faster than 4800 baud and expect it to work at all, and even there users
> typing on the terminal could cause spurious escape characters to be
> generated.
> I am thinking of redoing mine with a standard USB-to-serial dongle...
> wouldn't get the Pi kernel console there, but I could still have a getty.
> Incidentally the RF environment within the VT100 itself is more than the
> Pi's 3.3v single-ended external I/O can handle. ;)
> --
> Jameel Akari

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