Useful tips - For owners of Scorpio computers, I want to tell you about one, small, improvement to your computer.

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║  Useful tips.        ║
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(C) Klim Gromov

 For Scorpio computer owners, I want to tell you about one thing -
new, small, modification of your computer, if, of course, it is
will troubleshoot one of the possible malfunctions that I'm talking about
I'll tell you a little lower. This little nuisance may also
Compatible with other types of Spectrum, with similar design
solution for decoupling signal priorities.
    So, in Scorpio there are two signals with mounting priority
decoupling, in other types of Spectrum such decoupling is made on
logical level, or is absent altogether due to its uselessness in
this circuit solution. These signals are in the Scorpio computer circuit
are called "IORQGE" and "RDR".The first of them is used for pre-
preventing conflicts between computer motherboard ports and
ports of peripheral cards, devices such as controllers,
demos, etc.  etc. The second one is for blocking the selection of the main
system ROM of the motherboard, all for the same purpose, so that the unexpected
no conflicts with ROMmotherboard and peripheral ROM
devices, if any.
    In order not to prolong unnecessary polemics over such insignificant
As a matter of fact, I will say the following, these two signals are on
ends of two resistors (look carefully at the diagram), if you have
reactions such as unauthorized switching of speed
growth of the computer, or a cold restart of the computer instead of a warm one, then
Most likely you need to empirically select the resistance of these
resistors.  In almost all of Sergei Zonov’s schemes there is resistance
these resistors dangle in the ranges of 200-620 Ohms, on my
the board had a resistor on the wire "RDR" with a resistance of 520 Ohms, and
I had conflicts with SMUC'th and cachememory, I replaced the sopra-
voltage at 470 Ohms, thereby reliably unleashing conflicts. Also
the same thing needs to be done on the wire "IORQGE" if there are such
conflicts.
    One of my friends Sergey (341) called the company, and there he received
To eliminate such conflicts, it was recommended to increase anti-chatter
gov or anti-needle capacitors, preferably everywhere
where they are installed on the board, on the speed shift trigger,on the ROM socket and so on. It is advisable to make all these improvements
in a compartment, since these are the settings that, as a rule, are not
are made with specific boards in production conditions.
    I wish you a successful repair.