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Construction project - MD-100 and FA-7 compatible USB interface

Introduction

The presented device allows to transfer data between a PB-1000 or PB-2000C and a PC through the USB port. It supports the RS-232 and printer communication.

Construction

Circuit diagram

Photo of the prototype board

Project files

Contents of the archive usb100.zip:

• CPLD configuration file along with the VHDL source
• final revision of the schematic diagram and board layout, created with the freeware version of Eagle

The thickness of the board needs to be 0.8mm, because the 2x15 pin connector is mounted on its edge.

Photo of the final version of the PCB, without the extra blue wires

Usage

Serial port setup

The settings of the baud rate, number of data and stop bits, parity control are meaningless. No flow control should be performed.

Recommended file descriptor string for the Casio microcomputer: "COM0:2,E,8,1,N,N,N,N,N"

The PC and Casio settings don't need to match.

The RS-232 port operates in text mode. Binary files need to be converted to some text format, for example with the PBF<->binary data converter.