Memory Expansion Modules - NCR Decision Mate V Hardware System Technical Manual

MEMORY EXPANSION MODULES

The memory expansion modules (K200, K202, and K208) are
contained in small housings that fit directly into the I/O bus of
the NCR DECISION MATE V. Three different modules are avail­
able; however, only one at a time may be installed; and this must
be fitted to slot 1.
The modules contain semiconductor memory ICs (dynamic
RAM) and a bus interface connector. They are available in the
following sizes:
• 64K bytes — to provide a system capacity of 128K bytes
• 192 K bytes — to provide a system capacity of 256 K bytes
• 448 K bytes — to provide a system capacity of 512 K bytes
Figure 2.47 Memory expansion pin assignment
2-66
a
+5V
1
2
AO UT7
3
A O U T 6
4
AO U T4
5
6
7
8
9
10
11
ODO
12
OD1
13
OD3 14
15
LG R D
16
17
18
IDO
19
ID1
20
ID2
21
ID 3
22
ID4
23
ID5
24
ID6
25
ID7
26
CAS2 / 27
CAS3/
28
OD4
29
RAS/
30
OD6
31
LGRD
32
c
+5 V
AO U T 5
AO U T 3
A O U T 2
AOUT1
AOUTO
OD2
LG RD
CAS7/
CAS6/
CAS5 /
CAS4 /
CAS1 /
OD5
WE /
OD7
LGRD