[Please do not mail me a copy of your followup]
Ken Wiebe <
gv.k...@gmail.com> spake the secret code
<
6ca36624-f7de-4407...@googlegroups.com> thusly:
>On Tuesday, April 9, 2019 at 8:21:38 AM UTC-7, Ken Wiebe wrote:
>> Looking for a manual for Panasonic KX-D4911 portable data terminal.
>>
>> Nice rig, can't find manual anyplace though...
>
>I would like to see the specs on the modem, for one thing.
Probably whatever Bell standard was related to 300 baud modems. Bell
103 modem? <
https://en.wikipedia.org/wiki/Bell_103_modem>
>And while I think I have figured out how to set the serial port comm
>parameters, I want to make sure I didn't miss something.
Almost certainly 300 or 110 baud, 7 data bits, 1 stop bit. Unsure
about the parity, but no parity was common. If it's anything other
than no parity, they usually have a DIP switch or something to set
even, odd, or none for parity.
>There's a switch on the back that I don't know what it does. It's
>labeled 'in' and 'out'.
Heh heh. Nice. Now that I look at this pic of the 4910, I can barely
make out that switch on the bottom right.
<
https://terminals-wiki.org/wiki/images/2/28/Panasonic_KX-4910D_182794738418-3.jpg>
Does yours have those round plastic bumpouts like in that picture?
Are those connections or just something to hold screws? Looks like
screws, but I didn't take the picture.
It looks like there is some text molded into the plastic just above the
switch in the pic of the 4910; does yours have that too? If so, what
does it say?
>It's just nice to have a manual so you have a complete description of
>operations. Tweakers gotta tweak.
Yep.
>Also it is not a copy of the TI Silent.
Yeah, I'm not aware of anyone that directly copied the TI Silent 700
series terminals. However, I've never opened up any of my Computer
Devices terminals to see if they have identical circuitry. Honestly,
the circuitry in these portable thermal printing terminals is not that
elaborate because they don't have much, if any, smarts. This is
before modems were integrated onto ICs, so there will be a discrete
modem circuit, power supply, keyboard matrix scan logic, print head
control, motor control and some small amount of communication
buffering and special function decode (e.g. BS, LF, CR, HT, VT, FF
handling). I haven't dug into the Silent 700 schematics, but I'm
betting there isn't a microprocessor for the earliest of models.
You'd be surprised how fancy a terminal can get without a
microprocessor and just a state machine. The Beehive B100 does all
kinds of fancy ESC sequences[1] with no microprocessor, just a state
machine. The Operator's Manual[2] lays out the flow chart for the
state machine.
[1] <
https://terminals-wiki.org/wiki/index.php/CodeChart:Beehive_B100>
[2] <
http://manx-docs.org/details.php/74,18504>