Deja Vu #07 31 декабря 1997

Железо

drop of solder - Connecting the SMM to the ZX-Spectrum-y.

AY-Track: "SMALL TRILOGY - 4"
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(C) Ivan Mak



      Connecting the SIMM to ZX-Spectrum

      ==============================



          I welcome you, All!


   Many are interested in connecting to the sim
Spectrum. Shemku and give some explanations to it.


   Approximate location of the findings on RU7
(Should be specified by the scheme the computer).



           MA0 VCC

           MA1 MA5

           MA2 MA6

           RU7 MA3 MA7

           MA4 RAS

            DO WE

           CAS DI

           GND January 16 MA8



   Address bus and control MAi RAS, CAS,
WE are combined, and the data DI and DO are
two eight-bit bus. Signals can MAi
change places with each other.

   SIMM is a set of similar
same chip, which are connected together
signals DI and DO. Address bus and control MAi RAS, CAS, WE are 
connected with the same signals on SIMM'e. Signals Di SIMM 
should be divided into DIi and DOi. 

For this we need to collect such shemku.



               1533AP6 SIMM256K


  Di0 DA0 DB0 D0 MA0 MA0 DO0

  . DA1 DB1 D1 MA1 MA1.

  . DA2 DB2 D2 MA2 MA2.

  . DA3 DB3 D3 MA3 MA3.

  . DA4 DB4 D4 MA4 MA4.

  . DA5 DB5 D5 MA5 MA5.

  . DA6 DB6 D6 MA6 MA6.

  Di7 DA7 DB7 D7 MA7 MA7 DO7

  GND / VCC