Sharp PC-1500 Technical Reference Manual page 168

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ADDENDUM
Differences between the PC-1 SOOA and the
PC-1500
Take notice of thc::sc differences \V hen you use the 111achint language for the
PC-1500,\.
Page
89
90
91
PC-1500
©
Chip select decoder
... and
it is
used to select chip
by
means of S0-4. S6. S7. 2Y2 and 2Y3.
0
System RAM
Because 1hc 4-bit X
I K
bytes
TC5514
is used in a pair. the data bus is
divided in10 tw(> of DO-D3 and
D4- D7 a nd lhe selec1 signal S7 is
con1n1only
shared
so as to
be
compatible with the 8-bit
RAM.
Address is within 7800H
lO
7ll FFH
of lhe M EO area which is
used
fort he
systcrn
n1cn1 ory
area and for the
fixed variable area.
© User RAM
h
is lhe user
RAM
for which 8-bil X
2KB
HM6tl6
is
used. Address
selected by SO is wilhin 4000 H to
47F FH .
4-2-2. Block diagram
4-2-3.
Chip select circuit
PC-1500A
©
Chip select decoder
. .. and il is used
to
select chip by
means
of
S0-7. 2Y2
and
2Y3 . ...
0
System RAM
Address is within 7800H lo 7FFFH
of 1he MEO area which is used for the
systcrn
n1 enlory area.
machine
language area (7CO I
H~7FFFH)and
for lhe
fixed
variable area .
© User RAM
ll is
the
user RAM for which 8-bil
X
2K B
HM6 116
is
U~Cd.
Address
sclcclcd by SO- S2 is wi1hin 4000H to
57FFH.
4-2-2. Block diagram for the PC-
1 SOOA
Refer
to 4-2-2
diagram
for the
PC-
1500A
4-2-3. Chip select circuit for the PC-
1 SOOA
Refer to 4-2-3 circuil fo r lhc PC-1500/\.
161
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