ZX Ferrum #02 26 апреля 2004

Железо

Iron - reset circuit in the "Gluk Reset Service".

                  Pentagon - hidden reserves.


                  Reset to "Gluk Reset Service"

(C) 2004 Demon / Diman Plus Company


  Damn! Mom told me: "save often, son." And I did not listen, 
and here again full article dial. Hence the lyrics will not get 
down to business. 

  The Pentagon can not get into the quarter-zero ROM, which is 
not good. Once at the site zxnet. pp.ru I came across an article

with a scheme to do this (see below, section with cuts and
changes).


============ Cut ==============

(C) 2003 U # 74


               As the scheme Pentagon initially


   DD82 DD94 DD83

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

           LN2 DD83 DD89 B.14

    LI1 LL1 DD89 B.15

          / IORQ 1 1 3

                 2


  DD78 LL1


      o-12

   AG3

        R13 / IORQ

        470


 DD77 DD76

        VD2

  January 11 ~ September 13

              +5 V on May 12 June 1> / OIRQ

        C3 1 o8 4
 LL1 10o TM2

                                   LL1

      DD82

* C39-4 '6
DD77-5
B.8 C20 *

      LI1 / DOSEN DD36 B.1

                           DD83 DD84 DD83

      DD77

                         12 1 11 5 1 o-6 Sept. 1 Aug.> ROM2
 A14-1 January 13 March 1910 DD36 v.27
 A15-2 LN1 27c512

                           * C36 LL1 LL1

      LL1


                            Scheme 1


  Note:

  * C36 = bit4 port # 7FFD

  * C39 = / RESET

  * C20 may not be installed



                   Actually, and scheme


  Excerpt from (c) 1998-1999 AXLR "Refinement of the controller 
to work with the HD-disc": 

                        as it should be


   DD82 DD94 DD83

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

           LN2 DD83 DD89 B.14

    LI1 LL1 DD89 B.15

          / IORQ 1 1 3

                 2


  DD78 LL1


      o-12

   AG3

                                 / IORQ

           about


          C39
 DD77 'DD76

           '* O

  January 11 o * 13 September

                     +5 V on May 12 June 1> / OIRQ

     C3 1 o8 4
 LL1 10o TM2

                                          LL1

      DD82

 C39-4 '6
DD77-5
B.8 C20 o

      LI1 / DOSEN DD36 B.1

                           DD83 x DD84 DD83

      DD77

                         12 1 11 5 1 o-6 Sept. 1 Aug.> ROM2
 A14-1 January 13 March 1910 DD36 v.27
 A15-2 LN1 27c512

                           C36 LL1 LL1

      LL1


                            Scheme 2


  Legend:

  o - append

  x - cut

  * - Additional elements (2 elements LI1)


  The signal from the DD76 pin. 9 (TM2) is applied to pin DD36. 
1 (27c512), the old signal from DD36 vyv.1 disconnect. 


  If necessary, change the DD76 (TM2) on a faster, series 1533.
============ Cut ==============



  Of course, I was delighted, made the necessary changes, has 
launched PC saw a familiar Gluk Reset Service, was to dance, 
sing, jump. But later became disillusioned, the fact that Gluck 
is Basic option 128, selecting it, I'm surprised to hit the 
Basic 48. It turns out that for what would swap the service and

beysik128, so ... . It's like a flash in place Basic128. And 
besides, now you can not get any Basic128, no Service firmware 
only Basic48. 

  No, because things are not done, I said to myself, and began 
to think about scheme.


  After two cigarettes and ten minutes of meditation came to 
this option:



   DD82 DD94 DD83

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

           LN2 DD83 DD89 B.14

    LI1 LL1 DD89 B.15

          / IORQ 1 1 3

                 2


  DD78 LL1


      o-12

   AG3

                                 / IORQ

           about


          C39
 DD77 'DD76

           '* O

  January 11 o * 13 September

                     +5 V on May 12 June 1> / OIRQ

     C3 1 o8 4
 LL1 10o TM2

                                          LL1

      DD82

 C39-4 '6
DD77-5
B.8 C20 o

      LI1 / DOSEN DD36 B.1

                           DD83 x DD84 DD83

      DD77

                         12 1 11 5 1 o-6 x 9 1 August> ROM2
 A14-1 1 3 13 o 10 DD36 v.27
 A15-2 LN1 27c512

                           C36 LL1 LL1

      LL1

                                            ^

                                          here

                            Scheme 3


                      Unlike the scheme 3:


  Little differences to the disgrace.

  Cut the wire from pin DD84. 6 to DD83 pin. 9, and connect the 
legs 9 and 10 DD83 among themselves.




                       How it all works.


  When applying for a signal / RESET on the element LI1 (marked 
*) to pin 9 IC DD76 (TM2) produced a log. 0, while

as a signal of C36 also still has the log. 0, zero-turn 
quarter-ROM. Further, the program when switching pages are 
sending the value to the port # 7FFD with mask # 10, as a 
result of C36 and all the tiptop. 

  The scheme is already 2 months and everything is fine, even 
works NeOS (What I need it), but sometimes when you reset 
sometimes hit it once in Basic128, to eliminate this effect is 
necessary, as mentioned above replaced by DD76 series 1533, but 
I'm lazy, and for mikruhoy market should shove.