Table of Contents
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Chapter
1
Introduction
System Block Diagram
100x65
LCD Display
Keypad
Programming
2
An NEC V25 Microprocessor controls the M90. The following illustra-
tion shows the system block diagram. The system has a 256 KB EEPROM
program. An M90 Kernel program fits in 128 KB of the EEPROM space.
The remaining 128 KB is for special application software, allowing the
M90 to run stand-alone applications.
LCD
EEPROM
Driver
256 KB
Key
Serial
Matrix
RS-232
System Block Diagram
The maximum memory available in the M90 is 2048 KB RAM for stan-
dard builds or 4608 KB for special order units. The minimum RAM re-
quirement is 128 KB. The main battery powers all of the RAM memory
present. Otherwise, there is a backup lithium battery in case the main bat-
tery is absent or depleted. The RAM stores data and programs.
The M90 has a 12-character and 4-line, or 16-character and 8-line LCD
backlight display (per setting). An RS-232 Serial Port communicates with a
host system.
Use Microsoft C 4.0 or later, Borland C 3.0 or later, TURBO PASCAL
6.0 or later, or IBM PC macro assembler version 1.0 or later to program
the M90.
The downloaded application program determines the intelligence level of
the M90. Once started, the M90 operates as a stand-alone unit or can be
combined with a host or personal computer.
Sufficient energy stays in the main or backup battery to retain the program
and data even when the power is down. Transaction data transfers to the
computer or stays in the M90 RAM area.
16-Bit
RAM
CPU
2048 KB
Bar Code
Scanner
M90 Series Portable Data Entry Unit Reference Manual
Lithium
Battery
Real Time
Clock
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