SIGMA AS 226

Hardware

Microcontroller

Mitsubishi M5l8048

• Reference manual
• MELPS 8-48 architecture
• 6 MHz
• Internal ROM
• 128 Bytes RAM
• 2 KB ROM (?)

External RAM

HM6264LP-70

• 8192 Bytes
• Connected to the battery
• It keeps the programmed text
• Connected to the EPROM, maybe the EPROM reloads the default data to the RAM if the battery is low?

EPROM

Intel D27128

• 128 Kb
• Dumped the content on /Eprom dump
• Dumping tutorial
• Fixed dumper code on /Intel-Eprom-code

Clock Ic (?)

ASLC AX5210B

• did not find any info about this
• connected to the battery
• maybe is the IC for the real time clock functionality?

RS232

a pretty good documentation(it is in german). Only the RX line is really connected to the microcontroller. Also, the microcontroller does not have a serial port, so it is implemented virtually, using the interupt pin.

Python scripts

enconde_and_send.py

It will program the content of text.txt to the display.

tg_bot.py

A small Telegram bot that will send the messages replayed with the /display command or a formated text with /gen.