[GreenKeys] Model 15 + C-64 Baud rate question

[drlegendre .]

@Jim

Not sure what's meant by 'glass tty', but if it will talk 5-bit Baudot @
45.45 baud, that's fine. Will it run on XT compatible stuff, like my Zenith
Supersport or the NEC Ultralite Versa? The Versa uses the V30, not the V20
as I'd previously considered. Both are old machines, limited to DOS 2.X or
3.X at the best, I'd think.

I did some reading on the C-64 RTTY stuff, and it seems that +all+ options
require custom hardware modules, most of which seems to connect to the
Expansion (cartridge) port, rather than the User port.

Not sure how familiar you are with C-64 h/w, but the User port is sort of a
swiss-knife 8-bit I/O port with some other features like NMI / various
voltages / etc. implemented with one of the 6526 CIA chips. The Expansion
port is more "raw" - it exposes the system  address and data lines and a
few more low-level h/w lines to allow bank selection, start vector override
(for cartridge-based softs) and so on.

On Sat, Jul 4, 2015 at 6:53 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:

> If you have an old PC that will run DOS, there is a program all over the
> web, just google for rtty12g and that is a DOS program that turns the PC
> into a "glass Teletype".  Believe it will also run under Win95 and Win98
> is DOS mode.  After that Windows doesn't let it do what it needs to do to
> control the COM port.
>
> However if you can find how they do amateur RTTY on the C-64 we know that
> works too.
>
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