4. sd3 (ram based basic), Mz3500 – Sharp MZ-3500 User Manual
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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.
MZ3500
RAM
BANK
SELECT
МЛЗ
0
\
МЛ2
0
I MAI
0
I MAO
0
MAIN CPU
0
0
1
1
0
0
0 i
MSI = 1 (H )
MSO = 1 ( H)
SUB
CPU
c o o o
BFFF
IFFF
0 0 0 0
I I г
RAM в
2 I 3,
RAMA
lU 4L. 4U
ROM!
---- 1—
RAMC
2j- -
---- 1----- 1
KAMI)
3,
ЕЩх
\\
\'
\\
' \
\v
RAM sp
RAM SC
RAM
EAM _SA
\ ЦМ(СШ)
ROM I PI
ROMS
ROM BASE
OF THE
SUB CPU
ROM («02
0
0 0
0
1
BANK (
mo
)
0
0 1 '
1
0
SELECT /
moo
0
10
I
0
1. Bank select, MA0-MA3, is effective for memory area COOOH-FFFFH.
2. Bank select, MO0-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.