Sharp PC-1500 - Page 103

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All and more about Sharp PC- 1500 at http:/lwww.PC-1500.info
Me mory map VI
Display buffer
Since there are 7 X 15 6 dots with 14 additional do ts of sy mb o ls (DEF, I, PRO , et c. ), each
dot is a
ll ocated with a corresponding bit of the memory in o rd er to control activati on of
dots. Address is represe nt ed by the hexadecimal notation and "H" is us ed to represe nt high
state and
"L" to re present low state of segment drive signal s.
LCD
0 2 3 4 5
150 151 1 5l 151 1 56
~
7
-
4DDTS
~
(/)
V>
~
(/)
(/)
~
en
(/) (/)
(/) (/)
- -
-
-
N
""
....
"'
"'
"'
O>
O>
"'
"'
~
.- .-
.- r
r
.-
"'
w ....
"'
r r .- r
r
•
\
\
(/) (/)
(/) (/) (/)
(/)
)~
~ ~ ~ ~ ~
N w ....
"'
m
"'
"' "'
"'
"'
:x: :x: :x: :x:
:x:
:i:
N w ....
u •
"'
J
:I: :i:
:x: :i: :x: :x:
j _
3DOTS
I\
760 -
76 1- 762 - 763 - 764 -
HIGH Of«Jl:R LOW ORO ER H J:;H OROER L O' N OR OER HIGH ORDER L Oii' CflOE R liGH CflOER LOW ORO£R HIGtl ORO£ R ,- LO W OROER
H IT S 4BITS 4 s11s 4 ens 4 BI TS 4 B llS 4 BllS 4 BI TS 461TS 4 BITS
0
S79L SIL
S87 L S9 L S95L S1 7L S103L S25L SI I l l S31 L
- l-
-· -
--
1 S7 9H Sl H S8 7H S9H S95 H Sl 7H S10 3H S2 5H
S1 1 1H S3 1H
2 S80 L S2L
-
f-
3 S80H S2H
4 81 3
I-
-
5
81
3
6 82 4
7
82 4
-
8 83 5
I-
9 83 5
-
A 84 6
.J-
-
B 84 6
-
c
85
7 Sl17L
S39L
1-
D
85
7 Sl 1 7H
.--±..
S39H
E Sll6L SSL S94 L S1 6L S102L S24 L Sl l OL S30L
F S86H SSH S9 4H S16H S102H S24 H Sl l OH S30 H
'
·- -
ADDRESS
HIGH O RDER 4 BITS
LOW ORDER 4 BITS
I-
- -
764EH DEF
I
n m
SMAL L
SML
SH I FT B USY
764FH
NOT U SED
RUN PRO RESERVE
NO T U SED
RA D
G
DE
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