City #17 06 июля 1999

Железо

Iron - About GMX and what to do with it.

--------------------------------------------------
                 PLANET SHELEZYAKA
--------------------------------------------------
 (C) V. Kazakov


    Today we have a paper MH Petersburg ZX-News,
dedicated to the development of skilled craftsmen from the firm 
"Scorpion" board GMX.


 (C) A. Apollo


                  A little bit about GMX


    In late December 1998 has finally
I have received from the firm's "Scorpion" GMX card with RAM 2
MB, ordered in March. The board comes bundled
cable with 10-pin connector and a floppy disk with the current
ROM version of the Flash content.

    Installing GMX PCB Scorpion ZS-256 T +
took less than an hour. Fixed GMX does
does not interfere with use of expansion slots (such as
fears expressed in some Spectrum
editions). Below I quote a fragment instruction
Connection GMX:

 Refinement of boards "ScorpionZS-256, Turbo, Turbo +" for

               installing GMX.


    Scorpion ZS-256 - the very first card (yellow)
without modifications,

    Scorpion ZS-256 Turbo - the same fee, but
refinement Turbo,

    Scorpion ZS-256 Turbo + - a green dress.

    Names of chips that are referenced
in the description.

    DD38-IR22 (IR23) (data buffer);

    DD53-IR23 (port FF);

    DD43-KP11 (output multiplexer RGB);

    DD42-TM2 (trigger forming sinhrosmes);

    DD31-LA4 (shaper of human
clock).


                 What to do:

                 ----------------

    1. Cut the wire, suitable for DD38 / 1, and
apply for this leg of +5 V (for the yellow card Turbo
Instead, you must:

    - Wire coming from the DD68 / 6 moved to the ground,

    - A wire connecting the DD38 / 1 - Dop.IMS / vyv.4
deleted

    - Connect DD68 / 6 - Dop.IMS/vyv.5);

    2. Cut the wire, suitable for DD53 / 1, and
apply for this leg of the +5 V;

    3. Cut the wire, suitable for DD43/15,
and submit to this leg of the +5 V;

    4. Cut the wire coming from the DD42 / 5
(Jumper on the site R21), or vypayat this
resistor;

    5. Vypayat resistor R56 (R81 for a green card
Turbo +) on the INT processor;

    6. Remove diode from ALTER-s on WAIT processor;

    7. Reduce the electrolytic capacitor
RESET circuit processor to 0.1 (or less).

    This capacitor can be removed altogether (which I
made - AA), if your computer when you turn
Power comes in steadily Set Up.

    Of fault capacitor (typically 10-47mkF)
location:

    - On a yellow card next to 14.15 contacts
Music processor

    - On the green board next to the connector edge.

    8. If you need a separate cadre
Sync, then cut the wire coming from the
DD13 / 8, if not - leave the loop wire 2
free;

    9. Unsolder cable from the board GMX (attached to
board) in accordance with the table:



     GMX X1 Scorpion ZS-256


     VCC 1 VCC +5 V


     VS 2 XP1/22B (bottom) Personnel sinhroimp.


     G '3 DD43/12 Digital Green


     R '4 DD43 / 7 Digital Red


     I '5 DD43 / 9 digital Lum.


     B '6 DD43 / 4 Digital Blue


     MAG 7 XP1/15A top


     SYN 8 R21 Sinhrosmes VT1/BASE


     GND 9 GND Common



     10. Install the processor socket on the Z80
main board (if it is not already installed);

    11. On the main board removed from the sockets
PZU27512 or PPZU27010 ... 27040;

    12. Once GMX earn can be removed
(Better to leave - AA):

    - All chip RAM 41256 (565RU7)

    - Multiplexers running on RAM: DD15, 16,
17, 18, 19 - KP11 (KP14).

    If we compare the above improvements with
Scorpio scheme, we can see that
the main board in the work leaving only the controller
FDD, keyboard port, the port Kempston joystick port
muzprotsessor printer, and tape input
/ Output and audio beep. Everything else is or is not
works, or works for nothing. Ie almost
GMX card can connect to any Spectrum.

    Immediately after powering into the work shall
hardwired into the ROM GMX-Loader. After running short
test operations at the top of the screen for 1-2 seconds
appears:



         To go to the GMX Loader Set Up

            press the DELETE



    (The same inscription appears always after reset
computer, regardless of the selected mode
work).

    If during the output of this inscription is to click on
press DELETE (or hold it when you turn
power), the control program will
Loader (Set Up Loader) Otherwise,
running the Shadow Monitor (basic scheme
for GMX).

    If pressed DELETE, the following menu:



             GMX Loader (c) 1998 MOA

             -----------------------

           En. Restart your computer


              The choice of computer circuits

                  1 2 3 4 5 6 7


           Sp. Change the current drive

            P. Download ROM drive A:



                                    V1.1

        ---------------------------------



    Boot menu allows you to perform two
basic steps:

    1. Download one of six schemes (keys 1 -
7),

    2. Refresh the contents of Flash-memory from the floppy.

    Pressing ENTER will start the current scheme.


              to be continued ...