RAM-CART 128/256

List of elements like as in model 128K, plus
additional memory and two switches P1 and P2.

P, P' - switched at the same time 
	O - read;  Z - write

P1    - selection of version
           128 - module set to version 2x128K
           256 - module set to version 256K

P2    - exchange of memory
        When P1 is in 128K state the P2 changing
        one cart to second.
	When P1 is in state 256K the P2 changing
	halfs of memory.
        for example: 1st half of memory is like D7:
                     2nd half of memory is like D8:
                     (D7: and D8: in DOS)
        after switching P2
             D7: become D8:
             D8: become D7:

RESET - button "local" reset
diodes LED signal access to memory at region 
$8000-$9FFF; $7000-BFFF

In both 128K and 128/256, adequate pins of memory
(D0-D7; A0-A12) should be connect with plug which
is plug in to cartridge slot.

On the diagram connection D0-D7 and A0-A12 aren't 
show. They should be done (look in ram-cart 128).
On the diagram connection GND and +5V to 
integrated circuit aren't show. They should be done.

              GND           +5V
 7400          7            14
 7404          7            14
 7402          7            14
74174          8            16

You should block power supply of each integrated 
circuit with condensers 47 nF (according to general
rules).

The power consumption will be smaller when you
use integrated circuit type LS or HCT.