Skeleton - Finalization of the Pentagon - in the Startup PENTAGON-128.

(C) Vova KULIBIN
Music: OHRENETX (C) Mitchell / LS (R) DGN



        In the Startup "PENTAGON 128"



    To place Autoplay TR-DOS when you reset
computer, you need to reset the signal set
trigger TR-DOS'a (D76.2) to zero. To do this, cut the reset 
signal from the four legs of D82 (LI1) and feed it through the 
diode 13D76 KD521, KD522, or similar. If the diode at hand was 
not, you can use the following free item D82.4 as follows:


- Vypayat diode VD2,
- Connect 11D77 (cathode VD2) with 13D82,
- Connect with 13D76 11D82, reset c 12D82.


     Next, solder the capacitor 200 pF
between the 10D76 and housing (the hole under it on the board 
there). In addition, the signal C36 should be high status, this 
can be achieved by cutting leg 12D62, soldered in a gap 
resistance of 300 ohms and resistance 500-1000 Ohms between the 
10D83 and bus plus power. If you do not have the necessary 
elements, you can use a free element or microchip D65. As a 
rule, setup does not require, but in some cases

there is a need to pick up the capacitance between
13D76 and housing, and solder resistance 10
ohms between 4D82 and 5 in. Virtually all of the 128-th program 
in such alteration work fine, though there are some who do not 
recognize the car for 128K. They should be run through the main 
menu. Would be better if those who wrote them, would write 
something for calculators.



                 *



     Often "Pentagon 128" at elevated supply voltages 5,5-6,0 V 
(as at 5 "Pentagon" usually do not work) and on our drives 
refuses to format disks (usually off servo format on one side) 
or a bad format. You can fix this by replacing the resistive 
matrix on the same par value 500-1000 Ohms. If no other matrix, 
then it can be replaced resistances of the same value, embedded 
in panel between the legs as follows:



   1-16, 2-15, 3-14, 4-13, 5-12, 6-11, 7-10, 8-9.


     It is possible that in your case 8 resistors and
do not need, sometimes you can do 4-6'yu, but
better to put everything.


       Yes, will not rust your soldering irons!



lniki!