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2.
FUNCT10NAL DESCRIPTION
The 7701 1s organized to accept 16 pair (32 sockets) 2114L 1024 x 4-bit
statis RAMs. 'Although the card may be populated with less than the full
complement of 21l4L chips, the data bus drivers are enabled anytime a valid
address is present even if memory chips are not plugged in.
The card
address range is chosen to prevent bus contention with other system memory
elements including processor on-card memory, other memory cards, and memory
mapped I/O.
Each pa
i
r of the 211lll's add 1 K 8-b it bytes of RAM, wh i ch are
designated memory blocks 0 -15 (MBO - MB1S).
Each memory block consists of2 each (1024 x4) 2l14L RAMs.
(Reference
Assembly Diagram 102687)
PROM OPTION
; \.. v
11.) ""
~ ~
(V
2..0:;:
..
-~~----~
________ 1
r----.....-..-- . . . . . . .
~---~
- . . . . . . _-,
, (v
I~) ,v,,~+
.
<VLlj
,
......
---
-
----~
r- ,- ---- -- ............. ---.----.-. ----.
I
(VIi)
M
BS
(V2.~;
~---
- ------t
r-
--------~~
...................... -.j
, (YI S) N\
~~
(\.t
l..l) ,
~---------
......
-----~.J
,
................ . - ..... . . . - . _ ......
1
- - -
1
: tUI'-) M117
(V:l.4):
~-
-----..,.
v('
P (::
~
"-o"""~"
r---M"Bi ----,
~ LV
lS)
lU33)
:
.. --- -------4
.,
-
----- -........----
--
..-
~ .-~,
'''\l~
f
(,
+
~~~)
_~J~_:J
1--' -- ..-.
~~
-
~
...... _ ,
'(\I
1.'1)
M
~
'0
(...J
as) ,
~
__________ ...J
-,----...-...........
.........
-........-,
'l
V2.
~
")
M
~I
f
(v
~
(,) :
..:---
-----"
: (v 1..,)
--:'Vll\
,2:
-;-37):
... _ -_ -----_..J
r ----- ......... - -- ..... .-.....- -----;
'lv
~~)
M
&
'1
C' "
t
~)
;
.--
-
---
--------
,---
......
------~
. -
.......
- .
---.
.---_,
I(\J~\)
1V1I~J"\-
(v~q)
I
~-_,
_ _ _ _
~--l
r--------,
I (U'l'l.)
~AB 1.5
(1I~~
I
~---.
-..J
\I f~'~(\'
~C'.y~\\...
The card is designed to accept type 3625 PROMs in place of 2114 RAMs with an
increase in card power consumption.
PROMs and RAMs may not be mixed on the
same card.
If this option is exercised be sure to cut traces and ground pin
10
of all ch ips.
2
o
o
o
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