[GreenKeys] New Loop Converter Prelim specs

[Bob Camp]

Hi,

On the speed conversion stuff - there are only two reasonable cases:

1) TU is faster than printer
2) TU is same speed or slower than printer.

In the first case you will eventually run out of memory no matter what. Also
the print will lag behind the signal. This makes tuning and monitoring tough
to do.

In the second case you don't need a buffer.

On transmit the situation reverses. There is a difference though. I can't
type as fast as a 100 wpm machine will copy. At least I can't do it for more
than about three letters at a time. The thing that will fill the buffer is
the tape reader. How about a signal out of the box to tell the clutch on the
tape reader to do it's thing and hold off sending for a bit?

If it was set up that way a fairly small buffer should work just fine. The
18F4320 has 512 bytes of RAM on board plus eeprom for the selcall stuff. If
half of the ram went to buffer that would give you three full lines of print
in the buffer. You shouldn't be hitting the tape clutch to bad with that
kind of buffering.

    Take Care!

        Bob Camp
        KB8TQ



----- Original Message -----
From: "gil smith" <gil@vauxelectronics.com>
To: <greenkeys@mailman.qth.net>
Sent: Wednesday, February 26, 2003 1:14 PM
Subject: Re: [GreenKeys] New Loop Converter Prelim specs


> Hi folks:
>
> Thanks to all who responded with feature requests -- I hope I have them
all
> covered here.  This interface is sounding a lot like the one I did a
couple
> of years ago.  Many of you got these boards, and a few of you even built
> them up:
>
> http://www.vauxelectronics.com/gil/tty232/tty232/