Specifications

Multi Slave Product Ref'erence Manual"
Section 2
BANK AND PROM SELECT PORT
The BANK/PROM SELECT port apeci£iea which of' the two 64k memory
banks is to be active, and whether or not the PROM is to be
selected. The bit de£initions £or this port ere as f'ollows:
?--?--?--?--?--?--?--?--+
1071061051041031021011001
1 = Select Bank 0
1 = Select Bank 1
o = PROM on, 1 = PROM o££
not used, ignored
high order four bits
select amount o£ shared
memory (in Kbytes),
de£ined in Table 2-3
Figure 2-6 Bank and Prom Seloct Port Bit D~£inition.
Bits
D4-07
Shared
Hex
Value Amount
-----
------
0
16k
1 15k
2 14k
3
13k
4
12k
5
11k
6
10k
7
9k
8 8lt
9 7k
A
6k
B
5k
C 4k
D 3k
E 2k
F lk
Table 2-3 Bank Select Bit De£initionA
NOTE: Bank 0 and 1 are mutually exclusive and must not be set
active at the same time. When the PROM is selected, only memory
locations BOOOH through OFFFFH may be accessed £or RAM read and
write operations.
BANK/PROM SELECT PORT OEFINTIONS
Page 2-10