Table of Contents
Advertisement
M.Z 3500
2-4. SD3 (RAM based BASIC)
SD3 is active when "SHARP BASIC" is ececuted via RAM.
"SHARP BASIC" is loaded in RAM from the floppy disk.
MAIN CPU
MSI = 1 < H )
SUB CPU
RAM
BANK
SELECT
M
A
3
0
0
0
0
0
0
0
0
1
1
1
1
1
M
A 1
0
0
1
1
0
0
1
1
0
0
1
1 1
M
A
O
0
1
0
1
0
1
0
1 0
1
0
1 1
(
)
SFF?
1FFF
0 0 0 0
I I I
I I I
I I I
lüftaJx
"
'
RAMB
RAMC
RAM»
x
\
\^
1
2 , 3 , 4
1 , 2 , 3 , 4
1 , 2 , 3 , 4
\ \
3_
L
2
^ \
^ \
V
*
0
\\
RAJt| SP
\\
RAM SC
V,
RAM SB
KOMo
RAMA
ROMl
ROM2
KOW3
ROM4
\\
ROM BAS
1L
"-•
"
u
S'WfOOM)
Ut
"
'"
C
ROM 1 Pl
ROM
(«02
0
0
0
0
l
1
1
BANK
<M01
0
0
1
"
1
0
0
1
SELECT (
MOO
0 1 0
1 0
I
0
1. Bank select, MAO-MA3, is effective for memory area COOOH-FFFFH.
2. Bank select. MOO-MO2, is effective for memory area 2000H-3FFFH.
Operational description
The state of the System is determined by the bootstrap
program before the load of the System program.
Advertisement
Table of Contents
