4. sd3 (ram based basic), Mz3500 – Sharp MZ-3500 User Manual

Page 12

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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.

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