Crazy_hands - VG93 turbocharger scheme.

(C) V.M.G.                      
------------------------------------------
 This article describes two independent
developments from each other, significantly
improving the performance of the 1818 VG93 V microcircuit
computer ZX-Spectrum - digital PLL
company Western Digital and turbocharger circuit
VG93 by Russian authorV. Larkova.       
                                          
   The first circuit is a noise-
protected microprogram automatic machine
data transfer, allowing 10 times
ensure the reliability of reading data from the disk
you.  The difference is especially noticeable when working with
low-quality floppy disks and no less
glitchy drives.                     
                                          
   The second scheme not onlyincreases by 2
times the speed of working with the drive, but also
in most cases it removes unpleasant
crackling sound that occurs when you move it
magnetic heads. Reading and writing format
at the same time remains the same.                
                                          
   Both circuits are easy to connect and not
require adjustment.  Since in the Pentagon, on
which this modification is designed for, no and
there was no trace of these samples, so I decided
combine both schemes into one. If someone
if you want to separate them - no problem: from -
cut the bottom part of the diagram from the top and that's it
will separate on its own. In short, if you...
if you're good at electronics, then you'll be able to handle it
this problem.                         
























                                          
   The WF/DE signal is taken from pin 33
1818 VG93 (it was not used before).
Inputs _RAWR_ and RCLK are respectively
27 and 26 pins of VG93, old signals are required
let's cut it off.  Signal _RDATA_ - single
nal in the scheme that comes with dis-
driver;  1k resistor, same as 10k on WF/DE,
most likely already installed on the board
drive controller. Frequency 8MHz takes-
from a crystal oscillator, its polarity
doesn't matter. If connected correctly
valid and operational 556 RTHF signals on
its outputs resemble in shape the signals on
similar outputs to IE7.                  
                                          
   In the turbocharger circuit, chip D1 -
1533(555) TM2, D2 - 1533(555) KP11. Signal
WF/DE is the same as in the upper part of the diagram.
WSTB and CLK are respectively at 30
and 24 pins 1818 VG93, old signal on
CLK must be cut off from pin 24 and
use as 1MHz, applying D2 to pin 3improvements.  The frequency of 2MHz in the Pentagon is possible
take from pin 14 IE10 D93, and in the control -
re "Echo" from output 2 of counter IE7 D9.      
                                          
       MAP ABOUT IVKI RTC       
                                          
 And here comes the crap... Well, no, under
with the hand of RT's firmware - for the life of me. On mo-
ment of writing these lines Master (our sa-
chief electronics engineer) was at his de-
glasses, caps installed;), so I asked
No one has reliable information. I
I apologize for this glitch in the article and
I give a link to the printed edition, in which
there should be the following information: “Amateur radio”
Tel" #3 for 1993. I have this number
ra no, so I’ll take V.M.G.’s word.