funny with VG93

I somehow lost two VG93 (and all because I had no protection)
I went to the market for another VGshka, bought it without thinking (it was getting more expensive
dirty) I put it in the panel, turn it on BA-BANG!!! I have TURBODOS!!!!
as always, of course, I’m not surprised by such “insanities”; I’ve already had such cases
I’ve had them often =)
in general, the test shows a delay of 3ms, the drives are quiet and quiet!
can someone explain this attack with the VGshka?

Eugene aka P777/CrB/Ph7

TEV> I somehow lost two VG93 (and all because I had no protection)

You mean, 5 without 12? It’s better to solder a diode to the board for this.

TEV> I went to the market for another VGshka, bought it without thinking (the price of the
TEV> dirty trick) I put it in the socket, turn it on BA-BANG!!! I have TURBODOS!!!!

And how is this?

TEV> as always, of course, I’m not surprised by such “insanities”; I’ve already had such cases often =)
TEV> in general, the test shows a delay of 3ms, the drives are quiet and quiet!
TEV> can someone explain this attack with the VGshka?

Describe in more detail, everything in the world Let's explain. :-)))

Sincerely, Alex from FFC COMPUTERS.

>e-mail: as...@usa.net

> TEV> as always, of course, I’m not surprised by such “insanity”; there are already such cases
> TEV> I’ve had them often =)
> TEV> in general, the test shows a delay of 3ms, the drives are quiet and quiet!
> TEV> can someone explain this attack with the VGshka?
> Describe in more detail, everything in the world can be explained. :-)))

TEV> on the contrary, it’s 12 without five, and all because I’m powering it from two blocks :( that

Nope, I still think it’s dangerous 5 without 12.

TEV> that 12 doesn’t pull 5 volts. At 5 volts I have 1.5A!

It’s easier to put the diode plus at 5.

>> TURBODOS!!!!
>> And how is this?
TEV> I heard about TURBO VG? So, this is it, only without all sorts of

Of course, but when reading, the frequency doubles.

TEV> controller modifications !!!! writes?

TEV> maybe such a burnt VG :)

exactly. I've seen such a case.

Good Luck...

... Windows 3.2 will be released when 3.1 finishes loading.

TEV> blocks :( that
AL> Nope, even so I think it’s dangerous 5 without 12.
But I’ll wash it 12 without 5! One of my friends tried for a long time to fix the drive :) himself, and
then he brought it to me. The +12V wiring to the computer board has disappeared. I just soldered it - and
that's it! And all the repairs. But when +5 disappears, you have to change VG93.

MR> exactly. I have met such a case.
Similarly. Only it didn’t work in my stand for even 10 minutes!
And the symptoms on the non-turbo Scorpio were similar!

There is an interesting feature of the imported VG93.
They have -5..7 volts sitting on 1 leg, the load is kept up to 2-3 miliamps.
Who will explain this...???

Bye... bye bye, Sersh !

RM> I think it’s 12 minus 5! One of my friends tried for a long time to fix the floppy drive
RM> :) himself, and then
RM> then brought it to me. The +12V wiring to the computer board has disappeared. I just soldered it
RM> - and
RM> that’s it! And all the repairs. But when +5 disappears, you have to change the VG93.

Well, let's put it this way, I haven't come across cases where there were 12 without 5, because if
a person turned on the computer and no image appeared, he would immediately turn it off.
But if 5 comes, but there is no 12, then 10 seconds is enough, and the VG is in
heaven.

TEV> so they fell, so it is, I have 2 pieces that flew out because of this (5 without
TEV> 12)
TEV> installed the protection and that’s it!

Well, it was the other way around for me, since it’s problematic to not notice when you turn on
the Spectrum the absence of 5 volts, it just won’t work, that there will be
signals to turn off the power. On the contrary, it will very well be.

Hallo Sersh!

Monday February 23, 1998 23:55, Sersh Zerov wrote to Max Romanoff:

SZ> There is an interesting feature of the imported VG93.
SZ> They have -5..7 volts on 1 leg, the load is kept up to 2-3 miliamps.
SZ> Who will explain this...???

I remember, I remember, similar information has already slipped through here!

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=
Area : ZX.SPECTRUM
From : Serge Zhavoronkoff 2:5080/1 Mon 17 Jan 94 17:06
To : Vladislav Baliasov
Subj : VG 93
──────────────── ────────────────────── ────────────────────── ───────────────────
ZX hello!

> SZ> And you think that the “reading strobe” and DRQ are one and the same
> SZ>?...
> SZ> That’s what I see, something strange was inspired by this letter of yours...
> SZ> Memories.. Well, “Now what’s written in the doc: At
> SZ> team

> Speaking of birds. I foolishly thought so too at one time, especially since I couldn’t read the track correctly. But
> indeed, you are right! But I wasn’t smart enough to plug in a Siemens chip
> perhaps it would have worked...

And what was most interesting was that I
didn’t have any Siemens chips... :) But what was there was a bunch of Kievsky microcircuitsplant
"Crystal" (there they also have a diode designation on the label). And these microcircuits
were from our local radio dump in Kirovgrad. Everything was brought there
from almost the entire union at one time. These microcircuits were obviously from the very first batches, probably experimental ones. Among the heaps of cases with an elementary
lack of contact with the crystal, there were copies with an inverted
crystal exactly the opposite, which worked perfectly. Maybe they used imported crystals in the first batches? An interesting feature -
these m-circuits _really_ outputted -5 volts to 1 pin - it was possible
to power something very_low_consuming, such as -5 V for the i8080 :)
Now this voltage is not output...
So there DRQ worked as written - the track was read - absolutely brilliant!
Behind the sector data area after CRC and one byte 4Eh (or 00 - I don’t remember exactly
:) there was a synchronization failure (the recording was turned off, and if you read
immediately after formatting, then there was no failure), then on the header marker
everything was synchronized again - we see the title is like in a book.
Then again a breakdown - they turned on recording, recording sector data - again
synchronization on the marker and sector data. Etc.

> Moreover, the severity of my guilt
> is aggravated by the presence of a photocopy of the original description of the entire clone of these
> chips
> 0 - and there it is said in black and white that synchronization is carried out according to the
> address marker, and the data, markers, CRC are read correctly, and on
> GAPs bit dropouts are possible.

Exactly, exactly! If any clever defender added anything after
CRC, then this addition was wonderfully visible, because was still
synchronized.

>SZ> floppy disk with Y By Emki - dragged it onto his ancient machine - and here
>SZ> you have the whole
>SZ> structure of the desired track at a glance.) Eh! For some reason I signed up
>SZ> -
>SZ> I remembered the past... :)

> And I did it exactly like Andrey:

>>> described above, and some still set DRQ as soon as 8 bits accumulated in the
>>> shift register ;-)

Now, I guess I didn’t come across these new, wretched 93s when I used them still
was studying. And now - for sure - I’m too lazy to check it.

> Maybe, really? It’s a pity, I’m too lazy to check - but I should! And then I
> at one time stupidly looked at this jumble of bits and was in complete
> confidence that this was how it should be!

> with respect Vladislav

All the best to you! Hello family and dog! Serge ZX

> P.S. “Live forever, learn forever,” thought Rzhevsky...”

That’s for sure! - said the Red Army soldier Sukhov. :)

-+-GEcho 1.00
+ Origin: Do good and throw it into the water! (2:5080/1)
=-=-=-=-=-=-==-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Sincerely George

To Moderator: see Origin ;)

One day Sat Feb 28 1998 01:23, Tyukaev Eugene Vladimirovich wrote a letter
All:
>> Vladimirovich: maybe this VG is burnt :) exactly. such a case

25 Feb 98 Alex Letaev hoping that Roman Milukov will read,
wrote:

AL> Well, let’s just say, I haven’t encountered cases where it was 12
AL> without 5, because if
AL> a person turned on the computer, and no image appeared,
AL> he will immediately turn it off.
And most likely he will then you will have to change the VG.

AL> But if 5 goes, but 12 does not, then 10 seconds is enough, and
AL> VG is in
AL> heaven.
Well, I don’t know... I’ve encountered both +5 and +12 disappearing. I drew conclusions for myself. Experiment. :)

AL> Well, it was the other way around for me, since it’s problematic to not notice when you turn on
AL> the Spectrum is missing 5 volts, it just won’t work, that
AL> there will be signals to turn off the power. On the contrary, it will be very true.

usually the problem may be due to the power supply, in which 5 volts
appears later than 12.

Good Luck...

... Windows Error 004: Multitasking attempted. System dying.

One day Wed Feb 25 1998 23:04, Max Romanoff wrote a letter to Sersh Zerov:
SZ>> There is an interesting feature of the imported VG93.
SZ>> They have -5..7 volts sitting on 1 leg, the load is kept up to 2-3 miliamps.
SZ>> That's who will this explain...???

MR> a on the soviet ones?
And on the soviet ones - there is nothing on that leg!
Therefore, the soviet VGshka can be placed in reverse, and it
will not burn out! G)

AL>> Well, it was the other way around for me, since it’s problematic to not notice when you turn on
AL>> the Spectrum is missing 5 volts, it just won’t work, that
AL>> there will be signals to turn off the power. On the contrary, it will be very true.

AL> Too short a time. There is little chance of burning out. I have one BG
AL> lasted 5 minutes to 12 seconds, 20, and whatever.

I don't care. V-Geshki are very sensitive to everything. as in
other things, and some other Soviet crafts of foreign analogues...
the same ports 55th. although, it all depends on the party...

Good Luck...

... Windows Error 00E: Window open, do not look in.

SZ> And on the soviet ones - there is nothing on that leg!
SZ> Therefore, the soviet VGshka can be put in reverse, and it
SZ> will not burn! with a bang.

Good Luck...

... Friends don't let friends use MS-DOS.

MR> I don’t care. V-Geshki are very sensitive to everything. as in
MR> other things, and some more soviet crafts of foreign analogues...
MR> the same ports 55th. although, it all depends on the party...

Well, it happens. I had three pieces, from one batch of VG, so all three burned out somewhere around the fifth time the power was turned on with a fully working
ambient circuit. :-))) And there was a funny incident: I was repairing a computer, and an element at the
input via an IP signal (I don’t remember the exact signal) broke through to the ground. There was no such thing, so I wired it directly to the VG directly from the drive, and the resistor was set to +5, and it still works. :-)))

I'm a little screwed up here...
MR> wow, it might burn out. with a bang.
But we came across boards for repair with an inverted VG,
and sometimes it turned out to be alive..

TV> unlucky stand -=8- ]
At this stand Scorpios begin their journey :).
At this stand they are treated. What have you heard from Potapov Seva?

> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Area : ZX.SPECTRUM
> From : Serge Zhavoronkoff 2:5080/1 Mon 17 Jan
> 94 17:06
> To : Vladislav Baliasov
> Subj : ВГ 93

09 Mar 98 09:48, Alex Letaev wrote to Max Romanoff:

AL> Well, it happens. I had three pieces, from one batch of VG, so all three
AL> burned out somewhere around the ~5th power-on with the surrounding circuit
AL> fully working. :-)))

vg-he really doesn’t like the absence of one voltage in the presence of the second (in
the sense of 5 and 12). I once installed diodes directly on its legs, so that only both voltages were guaranteed to be supplied at the same time. third year already
rumbles.

Bye!
Rick Murray
mur...@geocities.com http://hey.to/letit ICQ:6653886

RM> I really don’t like the absence of one voltage in the presence
RM> of the second (in the sense of 5 and 12). I once installed diodes directly to its
RM> legs, so that only the two voltages were guaranteed to be supplied at the same time.
RM> it has been rattling for three years already.

They were supplied simultaneously there anyway. In this place, another WB has been operating for two years without changing anything. They were just bad from the beginning.

Пока!
Rick Murray
mur...@geocities.com http://hey.to/letit ICQ:6653886

RM> milliseconds are enough. Most home-made power supplies have
RM> separate stabilizers for 5 and 12 V, which is almost a guarantee
RM> of non-simultaneity.

No, only individual VGs burn during this time, and there are a considerable number
of just such units, and the computers work.

I have 12 made from 5 using a transistor and a choke.
It has been plowed for almost 3 years and the VG has never changed...

With best wishes - Andrey Khristov (ha...@robin.alt.ru)

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