headers
Peter | 1 Aug 01:28

Re: m100 Digest 30 Jul 2007 20:44:58 -0000 Issue 1009

<x-flowed>

I think you've got it backwards.... you can get a usb to serial cable at  
radio shack, not serial to usb.

Besides, it seems to me that post printers have a usb AND a parallel  
connector.

Smaller printers like the ttx-100 use a db-25 connector just like an old  
serial cable. Most use the bigger centronics connector. (I think.)

On Mon, 30 Jul 2007 22:21:04 -0700, Roger Merchberger
<zmerch@...>  
wrote:

> Rumor has it that Sethkimmel@... may have mentioned these words:
>> In a message dated 7/30/07 1:45:17 PM Pacific Daylight Time,
>> m100-digest-help@... writes:
>>
>>
>> > Seth,
>> >
>> > How do you connect the printer line from the M100?
>> >
>>
>> Use the RS or Rick Hanson flat ribbon cable -- one end in the M100  
>> printer
>> port and the other end into the printer's RS232 port.
>
> Fairly easy to make your own with parts from Mouser:
(Continue reading)

Permalink | Reply | 1 comment |
headers
Miklos | 1 Aug 02:06
Permalink | Reply | 1 comment |
headers
Peter | 1 Aug 02:18
Permalink | Reply | 9 comments |
headers
Peter | 1 Aug 02:42

Re: m100 Digest 30 Jul 2007 20:44:58 -0000 Issue 1009

<x-flowed>
That should be "most" printers... :*{

On Tue, 31 Jul 2007 16:28:28 -0700, Peter <pvollan@...> wrote:

>
> I think you've got it backwards.... you can get a usb to serial cable at  
> radio shack, not serial to usb.
>
> Besides, it seems to me that post printers have a usb AND a parallel  
> connector.
>
> Smaller printers like the ttx-100 use a db-25 connector just like an old  
> serial cable. Most use the bigger centronics connector. (I think.)
>
> On Mon, 30 Jul 2007 22:21:04 -0700, Roger Merchberger  
> <zmerch@...> wrote:
>
>> Rumor has it that Sethkimmel@... may have mentioned these words:
>>> In a message dated 7/30/07 1:45:17 PM Pacific Daylight Time,
>>> m100-digest-help@... writes:
>>>
>>>
>>> > Seth,
>>> >
>>> > How do you connect the printer line from the M100?
>>> >
>>>
>>> Use the RS or Rick Hanson flat ribbon cable -- one end in the M100  
>>> printer
(Continue reading)

Permalink | Reply | 0 comments |
headers
Stephen Adolph | 1 Aug 03:18
Permalink | Reply | 0 comments |
headers
Ron Wiesen | 1 Aug 15:08

Re: rtty

Hello Peter:

> What does the "terminal unit" required for decoding rtty consist of?

Radio TeleTYpe (RTTY) is nothing more than TeleTYpe (TTY) conducted via a
radio link.  So it's decoding of TTY that you're interested in doing.  TTY
uses the Baudot code which is a forerunner to the modern codings used today
to carry traffic in serial transmission channels.  For RTTY, a "terminal
unit" merely is the hardware that modulates/demodulates a carrier in order
to impress the Baudot code upon it.  The conventional tone-pair modulation
used to impress Baudot code onto a carrier for TTY transmission has 700 Hz
as the MARK level and 500 Hz as the SPACE level.  Link [
http://jproc.ca/rrp/sgc1a.jpg ] shows the TT40A/SGC-1A terminal unit, which
is military equipment that sometimes is available on the surplus market.

Note that a terminal unit plays no role in the "decoding" of Baudot in
TeleTYpe (TTY).  The terminal unit merely modulates and demodulates.  In the
past, Baudot code was decoded electro-mechanically by TTY printers, and
Baudot code was endecoded electro-mechanically by TTY keyers.  It was done
by "selector" magnets, cams with slip clutches, and generally associated
with perforated tape as a medium for message storage.  Today, Baudot code is
decoded and encoded by computers with the computer screen serving for
message display (i.e., not directly printed) and the keyboard serving for
message origination.

Baudot is a very succinct code which expresses only textual symbols: the 26
Latin upper case letters, numerals 0 through 9, and a precious few
punctuation marks and special symbols such as Carriage Return and Line Feed.
Consequently, TTY and RTTY transmissions tend to carry simple textual
messages.  The exception is "TTY art", which is breathtaking to view when
(Continue reading)

Permalink | Reply | 8 comments |
headers
Ron Wiesen | 1 Aug 15:21

Re: rtty

Link [ http://www.arrl.org/notes/1832/ch30.pdf ] may be of use to you in
regard to the Baudot code in general and its standard signalling rates (page
3), the several Baudot alphabet sets (page 5: ITA1 through ITA4), and the
control sequences of symbols that the C.C.I.T.T. recommends for RTTY usage
(page 7).

-= Ron =-

----- Original Message ----- 
From: "Ron Wiesen" <ronw@...>
To: <m100@...>
Sent: Wednesday, August 01, 2007 9:08 AM
Subject: Re: rtty

> Hello Peter:
>
> > What does the "terminal unit" required for decoding rtty consist of?
>
> Radio TeleTYpe (RTTY) is nothing more than TeleTYpe (TTY) conducted via a
> radio link.  So it's decoding of TTY that you're interested in doing.  TTY
> uses the Baudot code which is a forerunner to the modern codings used
today
> to carry traffic in serial transmission channels.  For RTTY, a "terminal
> unit" merely is the hardware that modulates/demodulates a carrier in order
> to impress the Baudot code upon it.  The conventional tone-pair modulation
> used to impress Baudot code onto a carrier for TTY transmission has 700 Hz
> as the MARK level and 500 Hz as the SPACE level.  Link [
> http://jproc.ca/rrp/sgc1a.jpg ] shows the TT40A/SGC-1A terminal unit,
which
> is military equipment that sometimes is available on the surplus market.
(Continue reading)

Permalink | Reply | 1 comment |
headers
Tim Borden | 1 Aug 15:39
Permalink | Reply | 1 comment |
headers
John R. Hogerhuis | 1 Aug 18:18
Picon
Favicon

Re: ReMem: model for 8201 memory assignment

On 8/1/07, Tim Borden <Tim.Borden@...> wrote:
> The NEC 8201 cartridge port was a 32k bank. The 8201 could support 3 banks, two in the computer and one in the
external port. There is a bank selection option in the main menu. They included a small machine code
routine to copy files from one bank to another. I have two external 32k cartridges. One company made a
cartridge with 4 banks (128k) in it with a selector switch to enable one of the four banks to be in bank three.
>

Thanks Tim.

Any idea how it does the bank-to-bank copy?

Do you need to load a ML routine into both banks to do the copy?

-- John.
Permalink | Reply | 0 comments |
headers
Donna Rosebaugh | 2 Aug 02:50

Tandy 200 - can't fire it up

<x-flowed>
I have a Tandy 200, bought new in the '80's, and spent several years of 
nights writing my own programs on it, in Basic.  I love this computer, 
but eventually "graduated" to a Windows PC.

My T200 has rested in it's original box for a decade or so, with an 
occasional change of batteries.  Last year I found that I could not turn 
it off with the POWER switch, and so had to turn it off with the MEMORY 
POWER SWITCH on the bottom of the computer.

I want very much to get my T200 up and running again.  Can anyone help 
me with this, or point me in the right direction?

I've put new batteries in, and tried to power it up.  This is what 
happens when I turn it on by turning on the MEMORY POWER switch on the 
bottom:

The screen comes up as normal, with date Jan 01, 1900.
The names for the folders BASIC, TEXT, TELCOM, ADDRSS, SCHEDL, MSPLAN 
are visible.
"19590 Bytes free", and BANK, COPY, KILL are visible along the bottom of 
the screen.
In other words, the screen appears exactly as it always has.

The ARROW keys on the keyboard work, to move the cursor thru the program 
commands for BASIC, TEXT, etc.  That is the ONLY thing that works on the 
entire computer.  Highlighting BASIC or MSPLAN, or any of the programs, 
and pressing ENTER has no affect whatsoever.  I cannot enter any of the 
programs.  The POWER switch will not turn the computer off.  None of the 
FUNCTION keys have any affect.
(Continue reading)

Permalink | Reply | 13 comments |

Gmane