Pentagon - Instructions on how to activate unused (zero), the banks ROM in your computer Pentagon.

<b>Pentagon</b> - Instructions on how to activate unused (zero), the banks ROM in your computer Pentagon.

 (C) 2003 U # 74


        Activation Instructions
 Unused (zero) BANKS ROM

        IN COMPUTER "Pentagon"


0. Theory

Choice Bank (0-3) ROM Pentagon control signals to the legs 1 
(A15) and 27 (A14) as follows:



A14 = 0

      BANK0 (failure to involve)
A15 = 0

A14 = 1

      BANK1 (TR-DOS)
A15 = 0

A14 = 0

      BANK2 (BASIC128)
A15 = 1

A14 = 1

      BANK3 (BASIC48)
A15 = 1


From this plate, it follows that we neobholimo Reset'u to 
install on the findings A14 and A15 ROM low level, in order to 
use the 0-th bank ... And how do we now and we will investigate.



1. What we have


As it is there to be in the scheme of companies:


    DD82 DD94 DD83

A0 1 '3 1 1 o 2 4 1 6> / INEN
A1 2 5 on ID4

                                 DD89: 14

     LI1 LN2 LL1 DD83 DD89: 15


         / IORQ 1 1 3
 DD78 2


     o12 LL1 / IORQ> / OIRQ
 AG3 R13

       470

                                  DD85
DD77 DD76

      VD2 May 1
 January 11 <13 June 9

      C3 === +5 V 12

                1 o8> 4
LL1 DD82 10o TM2

                                   LL1
 * C39 4 '6 === C20 *
DD77: May 8> / DOSEN

                                   DD36: 1

        LI1 27c512

                     DD83 DD84

     DD77

                   12 1 11 5 1 o 6
A14 1 1 3 13
A15 2

                      LL1 LN1

      LL1

                              DD83


                             9 August 1st> ROM2

                       * C36 1910 DD36: 1927

                                   27c512

                               LL1
* C36 = bit4 port # 7FFD
* C39 = / RESET
* C20 may not be installed


2. What do we do with all that?

                 In the sense - how to overcome?


Turned for advice to AXLR, and suddenly help?

Excerpt from (C) 1998-1999 AXLR
"Further development of the controller to work with the 
HD-disc": 


   as it should be

                         > DD36: 1 (27c512)

             C39

                      LI1 DD76 (TM2)
DD77 (LL1) LI1

                       '13 9 - -
 January 11 '

     === C3 o8 - -


 DD78 (AG3)


         12



  The signal from the DD76: 9 (TM2) served on the DD36: 1
(27c512), the old signal from the DD36: a disconnect.

  If necessary, change the DD76 (TM2) in the
a faster, series 1533.


3. Threshold somewhere else ...


Here are some opus, once courtesy Alone Coder'om at my request:



              RESET IN TRIP

(C) 2001 T (C) S [Harder from Ryazan]

                           DD36: 1 (27c512)

   C39

             LI1 DD76 (TM2)


           4 '6 13 9 - - -
DD77: May 11

                            o8 - - - -

    C3 === DD82


             DD77: 8


C36 (DD62: 1912) <> DD36: 27 (27c512)

* Where DD62 (TM9) - trigger port # 7FFD

    (12noga - output of 4 bits of this port)

* Note from the U # 74: ROM2 = (DOSEN [NEinversny!] OR C36)
ie as it is to be in the scheme:


             DD83 (LL1)


    DOSEN 9 August 1 DD36: 27 (27c512)

    C36 1910


* Note number two - look at the scheme
AXLR and try to find the difference, the more
there is provided a signal from the Magic (through AG3 th) ...


4. Here are some variations on a theme ...


Vojager # 1
(C) Vova Kulibin



      In the Startup "PENTAGON 128"



   To place Autoplay TR-DOS when
resetting the computer, it is necessary to signal
reset to set the trigger TR-DOS'a (D76.2)
to zero. To do this, cut the reset signal from the legs 4D82 
(LI1) and submit it 13D76 on the diode KD521, KD522 or 
equivalent. If the diode at hand was not, You can use the free 
element D82.4 as follows:


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


   Next, solder the capacitor of about 200
pF between the 10D76 and housing (the hole under
He is on the board). In addition, the signal
C36 must be in a high state of
can be achieved by cutting off a leg 12D62, soldered
at a gap resistance of 300 ohms and the resistance of 500-1000 
ohms 10D83 between plus and tire cord. If

necessary elements do not, you can use a free element or 
microchip D65. Typically, setup does not require

but in some cases, you may need to find the capacitance between 
the 13D76 and housing, and solder resistance 10K between 4D82 
and +5. Virtually all 128-e program when such alteration work 
fine, though there are some who do not recognize the car for 
128K. They need to be run through the main menu. Had better

those who wrote them, would be writing something for the 
calculators. 

     Yes, will not rust your soldering irons!


5. Gray soldering:))


Looking for free items LI1 onboard - their
there ... And - go ahead!


Appendix:



    Free elements m / circuits on the board

         Pentagon computer-128.

Example: DD52 (4 OR 5 = 6)
4 and 5 - input;
OR - part of the action performed;
= 6 - output, leg room 6;
/ - Inversion.


  LL1
DD52 (4 OR 5 = 6)
DD65 (9 OR 10 = 8) - not all motherboards!


  LI1
DD82 (12 AND 13 = 11)
DD97 (9 AND 10 = 8)

   (12 AND 12 = 11)


  LN1
DD51 (5 = / 6)
DD84 (3 = / 4)
DD86 (11 = / 10)

   (13 = / 12)


  LN2
DD94 (13 = / 12)
DD100 (13 = / 12) - CMOS-series


  LP9 (repeater)
DD95 (13 = 12)

This list is useful to you, and repeatedly ...


6. For those for whom this information is not enough, please 
come to the second part article, which described in detail the 
sequence of actions to implement this Revised at the Pentagon 
...