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发表于 2023-11-14 10:51:58
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电路图有体现数据口。就像老式计算器单板机们用的FSK调制，用录音带存取。
SW55_TAPE_Jambalaya.zip
(25.1 KB, 下载次数: 135)
TestData.zip
(182.66 KB, 下载次数: 130)
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Sony SW-55 stealth feature
All 6 messages in topic - view as tree
J. Sherwood Williams Apr 9 1995, 12:00 am show options
I've just discovered something very interesting about the Sony SW-55
.... a feature hidden in the service documentation. Here is how it
works. Open the battery compartment being sure the AC adaptor is
plugged in and then remove the two lower batteries. There is a hole
marked "reset" ..... and there is another hole just to the left of
the reset hole... under the battery label .... and under that hole
(revealed by peeling back the battery label or just punching a hole
through it) is another switch ... just like the reset switch. You can
use a unbent paper clip or toothpick to press the switch.
After pressing the switch you can turn the radio over and look at the
LCD.... it will read "TAPE I/O" .... pressing the "2" key will make
the display indicate "TAPE OUT" and pressing the <1> Key will cause
the LCD to read "TAPE IN" .....now comes the fun part ... if you plug
a tape recorder into the "LINE OUT" socket and feed it into the
recorder and start recording ... strange digital tones will be
recorded after pressing <2> in the TAPE I/O mode. Likewise, you can
do the reverse, playing back the tones into the radio ....
So, I ask, what does it all mean? Is this a way to store and playback
certain settings? Is this a means to control the radio via the LINE
OUT jack? Can pages of presets be stored/restored in this fashion?
Perhaps this might be a clever way to exchange current SW-55 Memory
pages between users? I'll leave it to others to experiment furthur
with this newfound feature.
BTW: this switch is listed as "TEST" on the schematics and is shown
on the PC Board layout.... which is how I discovered it and thought
to look for the switch.
Robert S. Williams
KD4ZPH
Reply
Sam Goller Apr 10 1995, 12:00 am show options
j...@cabell.vcu.edu (J. Sherwood Williams) wrote:
- Show quoted text -
Perhaps the TAPE IN is there to use the radio as an audio power source
for a stand-alone cassette or CD player. Much like a modular stereo
has.
I have an SW77 and looked to see if it too had this hidden feature. I
couldn't find one. Then again, it could be hidden under the case.
sam
sgol...@tyrell.net
Reply
J. Sherwood Williams Apr 12 1995, 12:00 am show options
No, this isn't the case. The LINE OUT and REMOTE jacks are normally
used to record audio from the radio with a cassette recorder. The
switch, once pressed throws the radio into a special mode. Furthur
examination of the schematics reveals that one pin of the
microprocessor (in addition to the audio output) is hooked to the tip
portion of the LINE OUT jack. Additionally, the path is labled "data
out" on the schematics. The audio recorded when the radio is in the
TAPE OUT routine sounds very much like the cassettes used to store
programs on the old Timex/Sinclair Z81 computers. This indicates to
me that the reason for this feature is to store and restore data. The
SW77 and the SW55 are not, to my knowledge, related in design closely
enough to make it worth your while cross checking to see if the same
feature can be found on the SW77. Chances are, it is not.
Perhaps, One of you adventurous SW55 owners with a little time would
like to experiment by storing a data burst on tape, then changing the
stored pages in some characteristic way. Then, attempt to restore the
original condition from the tape...thus proving that the data being
sent is actually the stored station memories. If this proves to be
true, then it might be possible to store several different
configurations for each season or for different purposes and quickly
overwrite the configuration with new ones. It also might be a
interesting sideline for some enterprising lad who could offer
cassettes containing all the latest frequencies for a variety of
popular stations. Just a thought.
Here is a little diagram to show where the second hole is located
below the battery label
+ {_____] {____o] - reset0
^
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|
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| location of hidden hole/switch
You can use a needle to poke on the label till it punches through the
soft spot. I just found it by rubbing my thumbnail over the battery
lable till the outline of the underlying hole was revealed and then
cut a small hole in the label with an Xacto Knife.
Robert S. Williams, MD
KD4ZPH
Reply
raisins Apr 20 1995, 12:00 am show options
From: j...@cabell.vcu.edu (J. Sherwood Williams)
>>I've just discovered something very interesting about the Sony SW-55
>>.... a feature hidden in the service documentation. Here is how it
>>So, I ask, what does it all mean? Is this a way to store and playback
>>certain settings? Is this a means to control the radio via the LINE
>>pages between users? I'll leave it to others to experiment furthur
>>with this newfound feature.
From: j...@cabell.vcu.edu (J. Sherwood Williams)
>Perhaps, One of you adventurous SW55 owners with a little time would
>like to experiment by storing a data burst on tape, then changing the
>stored pages in some characteristic way. Then, attempt to restore the
>original condition from the tape...thus proving that the data being
>sent is actually the stored station memories. If this proves to be
Finally, I got around to trying this.
Yes, it is indeed a way to store (almost) all memory pages.
* I stored all info. (TAPE IN)
* changed a location in page 1 & one on page 25
* restored data from the tape (TAPE OUT)
* verified that the data was restored from the tape (over the changes I made)
A couple of notes:
* The Clock time, World diff. time, PAGE-0 (the timer page), & all
timer info. was lost.
* I tried storing & restoring several times. Every once in a while
I would get an ERROR message on the restore. (I used a micro-cassette
on speed 2.4 - quality not the greatest).
NEAT!
Why has it taken this long for this to be discovered?
I remember when I first bought my HP-45 (calculator).
The 'secret' 'stopwatch' timer function that could be
accessed by hitting 3 keys simultaneaously.
BTW, any 'hidden' functions on the SW100?
Reply
Barry E. Henley Apr 21 1995, 12:00 am show options
rais...@delphi.com wrote:
: *
I tried storing & restoring several times. Every once in a while
: I would get an ERROR message on the restore. (I used a micro-cassette
: on speed 2.4 - quality not the greatest
).
Reminds me of my Timex / Sinclair TS1000 computer from the early 80's. We
use to use a filter between the tape recorder and the computer. It was
called a "Winkidink". Maybe there's a new market for them. :>
--
Barry Henley | b...@netcom.com
Riverdale, GA | My homepage URL is:
U.S.A. | ftp://ftp.netcom.com/pub/be/beh/homepage.html
Reply
Zyylo Apr 29 1995, 12:00 am show options
I just recently subscribed to this newsgroup. I also have a SW-55. Could
someone review what this Stealth feature is? I was only able to read the
last 2 postings, and I couldn't make any sense on what the feature is.
Thanks
Reply
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