Polesse #16 24 февраля 2000

Железо

Laboratory - The scheme of memory expansion. CDOS-modem type "Allegro" for the ZX-Spectrum compatible computers.

              LABORATORY


(C) SPIRITS



              Hi All!!!


   Here, I write my little message to all
lovers SPECCY. Recently caught in the archive
FIDO small messagu of expansion
memory of the Spectrum to 1024K, by zapihivaniya there SIMM'a.
-----------------

   Well, that came last time to increase the volume of RAM on
SPECCY version of Taganrog 128! Now many owners
These masterpieces of technical ideas, can easily get
covered with dust, solder and assemble the wiring diagram of 
30-pin SIMMa. SIMM 1MB needed, but especially want to you can 
raise and 4MB.


   What does the "process of expansion? All very
simple: first vyderbanivaete with motherboards K565RU5, then
dopaivaetsya five chips: K1533AP6, K1533KP16, K1533KP12,
K1533ID7 K1533TM9 and then cuts a few wires,
make a few jumpers, buy old zanyuhanuyu 386
SX33, carefully fed to 30-pin socket, sawing her
into two parts, a fret saw and attach it where you byly RU5,
connect the wires again to the board to smash itself SIMM,
turn, and it all once, and earned a half-turn.

   Then you have all your pets, ugh it
same PiSyuk me something translated, but in reality you have
"PENTAGON-512", "PROFI-1024", with the ability to toggle off
the entire upper memory, lest, God forbid not go any KILO,
MEGA, GIGADEMO. To celebrate you give the other half
size sockets to his friend and he repeats the same operation, 
but you still get an extra opportunity to get a lot of fun,

scratched all three rubles.

   From there you can remove the following valuable items:
battery, the remaining twin socket for SIMM (to
sell it to another friend), chip clock CMOS, quartz at
32768Gts, ROM (if you're lucky, it is UV-erasure, and usually
disposable, and it can be thrown out), a bunch of small 
capacitors on 10mkF, the crowd of switches and a bunch of 
ISA-slots. Also meet the foreign analogues AP5, AP6 (look on

directory), resistor matrix, well, for special sadists -
processor itself, which can be stepped on, spit, fry
simmer, drop in a jar of sulfuric acid, tear
All legs and flush the toilet. Then:


             LD BC, # FFFF

      M1: Wash hands thoroughly

             DEC BC

             LD A, B

             OR C

             JR NZ, M1


  And finally, you can sit down SPECCY-1024.



        SCHEME EXPANSION MEMORY



        2 4 3 2 11 9

  D0 A0 Y0 D0 Q0 A3 Y3

        5 7 4 5 10

  D1 A1 Y1 D1 Q1 B3 D53

       11 9 6 7

  D2 A2 Y2 D2 Q2

       14 12 9 1 3
# DFFD A3 Y3 C '

        3 1 2

  D6 B0 R

        6 TM9

  D7 B1 D55

       10 RESET May 6
 GND B2 D50 '

       April 13
# 7FFD B3 D49 (6) 1

        1

         A / B

      15

         / OE KP16



   / /

       Through 1k resistor to the ground.
+5 V



         September 10

   (21) A0 Y0 * A8

         July 11

   GND A1 Y1 * A9

         12

   A10 A2

         13

             A3

         14

   (53) S0

          2

   (27) S1

          6

   (22) B0

          5

   GND B1

          4

  (A11) B2

          3

             B3

           1

              EA

          15

              EB KP12



      GND

Explanation: D53 (3)-GND

           D55 (3)-D19 (3) SIMM 30pin


                                       1 +5 v Vcc


                                       / Cas 2 / Cas

      February 1918
D0 D0 Q0 D0 3

      May 1915
D1 D1 Q1 A0 4 A0

      June 1914
D2 D2 Q2 A1 5 A1

      September 1911
D3 D3 Q3 6 D1

      July 1913
D4 D4 Q4 A2 7 A2

      August 1912
D5 D5 Q5 A3 8 A3

      March 1917
D6 Q6 GND 9 GND

      April 1916
D7 D7 Q7 10 D2

      1
/ WE OE A4 11 A4

     19
+5 V C AP6 A5 12 A5


                                                13 D3


  Rem: AP6 better soldering on A6 14 A6

      IR23 (next to CPU)

      Cause and legs go A7 15 A7

      not podryad.

                                                16 D4

     January 1913

        D0 # DFFD * A8 17 A8

     2 (# FDFD)

        D1 * A9 18 A9

     3

        D2 19 A10

     4

                                                20 D5

     5

                                       / WE 21 / WE

     6

            ID7 Gnd 22 GND


                                                23 D6
 Description of the legs ID7:

                                                24 NC

   1-A13 (A9)

   2-A15 25 D7

   3-/WR

   4-A1 26 ParOut

   5-/IORQ

   6-M1 (24) 27 / Ras


                                       / Cas 28 / ParCas


                                                29 ParIn


                                       +5 V 30 Vcc



      Changes on the motherboard



            9 10 9

  D53 (12) KP12 D16 (7) KP12 D55 (3) KP12

            5 12 5

  D52 (1910) A9 Gnd

           11

      +5 V

           13

   D53 (7) D18 D20 D19



   Memory test can produce redesigned Steve from
Coders'Academy "HONEY TEST" (or like it a test). Definition of 
upper memory is done automatically. Test is that has a bunch of 
settings and testing of regeneration, but it's quite a lengthy 
process: a full scan takes about half an hour, but without 
verification of regeneration - just over 3 minutes (1MB). 
Should not only pay attention to the fact that the test you 
have found extension "ATM-TURBO". If modifications are made, 
they just forgot about these inscription. By the way, if you 
want to own more and ATM-native extension, you will need only 
one more switch to the first leg of ID7 (A9-A13). 

-------------------------------------------------- -------------
   This information is provided to us Steve from Coders'Academy
-------------------------------------------------- -------------

   All comments and suggestions should be directed to
newspaper "Polesie", Nikushkin Cyril and Shavlovskaya Yegor. 
(C) SPIRITS. 



   The annex to the newspaper archive are:
Corporate BOOT to the annual newspaper files,
scheme Gomel CDOS-modem and new rulezy festival CC'000.

   Pay attention! Fidoshny address of the newspaper could soon 
change, which will be announced later. 



        CDOS-MODEM TYPE "ALLEGRO"
 FOR ZX-SPECTRUM-compatible computers

        Version by SSSR'99, Gomel


(C) KVAZAR



   Bring to your attention the scheme modem adapter for 
ZX-SPECTRUM-128 and higher. It represents a revised and

a modified version of the Minsk scheme
by ARS, but unlike the latter, has a number of significant 
differences and advantages: 

   - Complete electrical isolation from the telephone line;

   - A new scheme of the comparator, resulting in markedly 
improved communications; 

   - Implemented automatic blocking of
signal IORQGE, now connect the modem to
computers on the left decoding ports
external device does not make special
labor;

   - Auto-reset the modem by pressing RESET (modem lozhit tube).

   - Reduced number of enclosures chips
a more rational layout, which allowed us to halve the size of 
the printed circuit board modem. 

   - LED indication of mode-hook, receiving and transmitting 
(set by the user); 


   Policy support: all versions terminalki EMS, MMD with 
recycled modem drivers, games GAMBIT (chess), "Battleship." 
This version of the modem is fully compatible with Minsk and 
Moscow options. 


   We now describe the principal
scheme (see figure attached to a newspaper).
WARNING! All the resistors and capacitors are given in relation 
to the Homel telephone lines and our PBX, so most likely in 
your case you have to pick up specific ratings independently 
(Focusing on the quality of communication)! 

   Name of items:


      D1 - K555TM8 VT1 - KT361

      D2 - K555LL1 VT2 - KT815

      D3 - K555LP8 VT3 - KT315

      D4 - K554CA3 VT4 - KT315


   All diodes - KD522.

   Resistors such as MLT or equivalent.

   Capacitors all at face value.

   Any transformer, with compact
three windings 500, 250 and 250 turns, with
withdrawal from the mid-point (such transiki
can be found in disk telephones).

   Relays - RES-10 to 12V. In contrast,
from pyativoltovoy REF-49, previously stationed in
Ming scheme, it is more accessible.


   On-chip trigger K555TM8 collected
port of entry. At K555LP8 - Port Reading, and
on K555LL1 - decoder.

   Chipset K554CA3 - comparator. Diodes
in the chain of the fourth output of the comparator set 
threshold signal. 


   Modem is connected to the bus ZX-SPECTRUM,
under the said scheme on signals. Signal IQGE - neither more 
nor less than the signal IORQGE. RESET signal can be taken as a 
bus, so and the "Reset". Mounting should be quite thick wires 
of minimum length. 

   To properly configure the comparator
modem to a particular telephone line is desirable oscilloscope. 
Controlling the level and form of the signal on the line, 
picking up resistors and capacitors in the circuit of the 4 th 
output K554CA3, should dobitsya stable operation of the modem 
on most intra- ATC at 2400 baud, using a program EMS 2.55 and 
the driver is not below 4.02. 

   O ports. The modem has three standard
Port connections: # EF, # F3, and # 77. Scheme
modem has an automatic lock
external devices (see Polesie-13), but
some severe cases may need to tighten the decryption).

   On the line. Before you connect your modem, measure the 
voltage on the telephone line. When lowered the tube, it should 
be about 60 volts, and when raised - in the range 7-15V.



   For all questions regarding the assembly and setup the modem,
contact the editorial office or directly to the developer
scheme: (0232) 50-31-61 Alexander / SSSR /.