Iron - Speed ​​is the engine of progress.

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 (C)ART

 I’ll say right away that my article will be of interest
mainly the owners of the Pentagon, moreover,
128's. And this article is called:

       Speed is the engine of progress.

  What does the above mean? Which means this
what performance is standard
SPECTRUMA is clearly not enough
even for processing its periphery, screen
on, move 512 and 1024 kilobytes
memory, and all this at the same time. And that's it
there is a greater sense of need for some
be increasing our productivity
SPECCY.  Moreover, recently
There are many programs that
honestly declare that for their work it is desirable
It is advisable to have a turbo mode. An example would be
serve HEADBALL, MORTAL KOMBAT, BLACK
VORON, etc. And how many of them are there?
3.5 MHz works in such a way that life becomes sickening
new?
  Well, okay, enough of the lyrics, let's move on
straight to the point.  This diagram, as you see
(see Fig. A) is quite simple. Its principle
The work is as follows.
  In the NORMAL switch position, everything
understandable. In the TURBO position the situation is
so on. The processor begins to clock
frequency 7 MHz, simultaneously slow down
when accessing memory. Particularly
The advantage of this scheme is that the tour
bo-mode is disabled when accessing the port
there is a BIS controllerfloppy drive that created
There is a gentle mode of its operation.
  It is advisable to use microcircuits
ria 1533.
  This circuit was tested with a microcircuit
memory mothers 5b5PU5G AND 565PY7G. When using
using microcircuits of this modification
necessary on signal C21 (9th leg D49)
set the capacitance to about 150-250 pF.
 BENCHMARK TEST shows the speed at
working in ROM 200%, when working in RAM: with
capacity - 145% without capacity - 156%. TEST
4.11 shows an average of 147.9%.
 It becomes very pleasant in Black Crow
play.  I'm not even talking about IS-DOS and HO-
NEY COMANDER - they just fly.