Wanted man

Well, that's all, All, for now.

Alexander Grokholsky was with you
[I ZX] Spawn/Last Masters Group/X-Project Association

...

07 Jan 00 18:01, Alexander Groholsky wrote to All:

AG> Once I posted a question here about the fact that my MODEM conflicts with
AG> TR-DOS, and someone told me that Shepelev’s scheme is worse than
AG> Kondratiev’s, and promised me to upload something about it business.

Here is M. Kondratiev’s diagram. The difference from Shepelevskaya, as you can see, is in
the use of the IRQ4 signal of the modem to interrupt the Z80.
In Spec's ROM, in BASIC48, it is necessary to correct the processing error
NMI.
In cell 006DH, replace the code 20H with 28H. (I have to rewrite it, I did it a long time ago.) If you want to keep the MAGIC button working, then you need to send NMI signals to the Z80 from this circuit and from the flop controller via additional. element LI1, or better (simpler) - two diodes and
resistor.

K555LL1
┌─┐
/RD ────────┤1│
┌─┐ ┌──┤ ├──── IOR (B14)
A4 ─┤1│ │ └─┘
/IORQ─┤ ├─┤ ┌─┐
└─┘ └──┤1│
/WR ────────┤ ├─┬── IOW (B13)
└─┘ │
┌──────┘ K555TM2
│ ┌─┬─┐
│+5v 1─╪R│Q├5───────┐
│ ├─┤ │ │
└────3─┤C│ │ │
A11 ──────────2─┤D│ │ │
├─┤ │ │
/RESET──┬──────4─╪S│ │ │
│ └─┴─┘ │
│ ┌─┐ │
└─┤1╪── RESDRW (B2) │
└─┘ │
K555LH1 ┌─────────────┘
│ ┌─┐
┌─┐ └─┤1├── /NMI
IRQ4 (B24) ─┤1╪───┤ │
└─┘ └─┘

───┐ ┌─── MODEM
A8 │───│A0 (A31)
K A9 │───│A1 (A30)
O A10│───│A2 (A29)
M │ │
P GND ──│AEN (A11)

Wow, I barely drew it!
M.s.K555LL1, 1/2 K555TM2 and two inverters K555LH1 were used.
(I try to use the 1533 series.)

P.S. Don't forget to supply power to the modem connector and install
modem jumpers on COM1 and IORQ4
-5v - B5
-12v- B7
+5v - B3,B29
+12v- B9
GND - B1,B10,B31

AG> + Origin: Tell me, have you ever starred in cartoons? (2:461/16.23)

No. :-(

Kirill Frolov. [ZX]

Once [Saturday January 8, 2000] at [03:39:56] I saw how Kirill Frolov
wrote a letter to Alexander Groholsky.
The reason was the topic “Wanted man”.
I decided to comment on this event...

[skip]

KF> If you want to keep the MAGIC button working, then you need to send NMI signals to the
KF> Z80 from this circuit and from the flop controller to the
KF> via additional. element LI1, or better (simpler) - two diodes and
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KF> resistor.
^^^^^^^^^
Don't do THAT!!! The /nmi node is one of the indicators of reliable operation of support software! Don't skimp on reliability!
Mulk with 'diode' 2And I already tried it, nothing but glitches. Don't
be stingy, install an additional case (555LI1) if you can't find such
a free valve in the computer circuit.

[skip]
Sincerely, Felix.

[I ZX]

FK> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KF>> resistor.
FK> ^^^^^^^^^
FK> Don't do THAT!!! The /nmi node is one of the indicators of reliable operation of
FK> software support! Don't skimp on reliability!

I didn't write this...

FK> A cartoon with a 'diode' 2 And I already tried it, nothing but glitches
FK> I got nothing. Don’t be stingy, install an additional case (555LI1), if not
FK> you can find such a free valve in the computer circuit.

You still can’t connect to the bus like that.

I would put the resistor in place and add LH3, LP8, LP9, etc.
Or you can do it on KT315, but it’s probably not worth it.

Kirill Frolov. [ZX]

KF> You still can’t connect to the bus like that.

KF> I would put the resistor in place and add LH3, LP8, LP9
^^^
I would recommend this one. The most beautiful solution.

KF>, etc.
KF> Or you can use KT315, but it’s probably not worth it.

And rightly so.