re:TDD

[ah499@cleveland.Freenet.Edu (John Daniels)]

butch@qedbbs.com (Gabe Sanchez) said:
 
>>Does anyone know where to obtain software that will allow an Apple IIGS
>>to act as a tdd terminal through a modem.  tdd is, at least in my view,
>>a divice which enables the hearing impaired to use a telephone.
>>
>>Any imformation please direct replies to:
>>hass@plains.NoDak.edu
>>thankyou.
>
>All you have to do is set the modem baud rate to 300 baud.  I have a
>friend whose parrents are deaf and when he is not home I call again via
>modem at 300 baud and leave a message for him.
 
 
They must have a TDD machine that supports both standard 300 baud as well as
well as BAUDOT (deaf TTY) because they are not the same or even remotely
compatible.
 
BAUDOT has only 5 data bits plus a start and stop bit, a speed of about 45.5
baud, half-duplex and no carrier.
 
Some companies that make TDDs that also sell special modems that support TDD.
You might check Krown or Ultra-Tec.  The old Novation Apple-Cat modem supports
TDD just fine (as well as 300 baud in the Cat's single-card configuration) with
either Novation's Deaf Ware or with ASCII Express Professional.
 
                                                John Daniels
                                                ah499@cleveland.freenet.edu