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Appendix E
ASCII Unit Memory Map
Memory Structure
The memory structure is shown below. The addresses go from &H0000 to &HFFFF (0 to 65535) and are
divided into byte units. The 24 Kbytes (24,576 bytes) from &H2000 to &H7FFF make up the program area.
The contents of this program area can be read with the PEEK function (refer to page 62 for details). &H0000
to &H1FFF and &H8000 to &HFFFF (shaded in the diagrams below) are set by the system and so cannot be
read.
Memory Area
Remarks
I/O area 1
(&H0000 to &H001F)
This area is for internal ports of the
microprocessor 63B03.
System work area
(&H0020 to &H1FFF)
This area is used by the system.
Assembly
language
program area
&H2000
to
&H7FFF
Stores assembly language program. The
size of this area can be changed with MSET
command.
BASIC Text are
Stores intermediate language codes of
BASIC program. The size of this area can
be changed with the MSET command
System stack
area
Stack area used by the system.
Character string
area
Stores character strings. The size of this
area is normally 200 bytes and is set with
the CLEAR command.
Common memory area or
the Data Section
(&H8000 to &H8FFF)
RAM area for interfacing between ASCII
Unit and PC. When this area is accessed,
an I/O UNIT ERROR may occur. Do not
access this area.
I/O area 2
(&H9000 to &H9FFF)
Area to which ports ACIA, PTM, and RTC
are assigned.
System area
(&HA000 to &HFFFF)
This is the ROM area.
I/O area 1
System work area
Assembly language
program area
BASIC Text area
System stack area
Character string
area
System area
I/O area 2
Common memory
area or the Data
Section
7
0
&H0000
&H0020
&H2000
&H8000
&H9000
&HA000
&HFFFF
Set with
MSET
command
Set with the
CLEAR
command
: Program area
: System settings area
Summary of Contents for SYSMAC C200H-ASC02
Page 1: ...Cat No W165 E1 04 ASCII Unit SYSMAC C200H ASC02 ...
Page 2: ...C200H ASC02 ASCII Unit Operation Manual Revised September 2002 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 7: ...TABLE OF CONTENTS viii Glossary 159 Index 163 Revision History 165 ...
Page 122: ...Appendix B Specifications 115 130 35 100 5 ...
Page 168: ...Cat No W165 E1 04 C200H ASC02 ASCII Unit OPERATION MANUAL ...