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USER GUIDE
The PROM-4 board uses Intel 8702 or 1702 ROM chips which
are structured 256 x
ment possible in memory space is 256 bytes or 1 8702-
1702 chip.
The board is designed to contain up to 16
8702-1702 devices, which is the full 4K of PROM.
the 16 PROM sockets has its own unique address, and each
PROM operates independently of any other PROM.
the user may structure his/her memory space in any way
desired merely by placing his/her PROM(s) in the desired
location(s).
The PROM-4 board is structured so that the memory address
corresponds to a physical location on the board.
sockets are arranged in a
particular PROM socket is addressed by address bits A
A9, A10 and All.
is addressed by address bits A0 through A7.
are labelled LOW 0 through 7 and HIGH 0 through 7.
should clarify the relationship between address and se
1
lected socket.
ADDRESS
All
A10
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
bits so that the m n i m u m incre
8
x
rectangular array, and a
2
8
A particular byte in the selected PROM
TABLE 1
A9
A
8
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
PROM-4, Rev. 3
User Guide
Each of
Thus,
The PROM
The sockets
SOCKET
ADDRESSING
L0
Ll
L2 '
L3
L4
L5
L
6
L7
HO
HI
H2
H3
H4
H5
H
6
H7
,
8
Table
7 - 1 1
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