What is MTK-85?


User's Manual


Ordering Info


8085 Microprocessor Articles

Experimenting the MTK-85 with Micro-C

Intel 8085 Wiki


8085 Microprocessor Training Kit

Single board computer built with a 1970 Microprocessor, the Intel 8085. Designed for learning the microprocessor instructions using machine code.

The MTK-85 is a low-cost single board computer designed for self-learning the 8085 Microprocessor. The kit enables studying from low level programming with direct machine code entering to high level programming with PC tools easily. A nice feature, single-step running, helps students learn the operation of microprocessor instructions quickly and clearly. The user registers provide simple means to verify the code execution. Using a PC as the terminal, the MTK-85 can receive the Intel hex file and disassemble the machine code into 8085 instructions. The MTK-85 is professional design that combines classic microprocessor, peripheral chips with modern IC technology; Programmable Logic Device decoder, brownout reset, and text LCD.

Block Diagram of the 8085 Microprocessor Training Kit

Hardware Features:

  • CPU: CMOS 80C85 4MHz
  • Memory: 32kB Monitor ROM and 32kB SRAM
  • Simple I/O Port: 8-bit GPIO built with 74LS175 D-type F-F and 74LS126 Tri-state buffer
  • Programmable Ports: two 8255 chips, system and user ports
  • Programmable Counter: 8254
  • UART: Classic NS8250 compatible UART
  • onboard I/O devices:
  • 6-digit seven segment LED,
  • 28-keypad,
  • 4-bit dot LED indicates status of GPIO,
  • buzzer,
  • text LCD with CPU bus interface with standard controller HD44780,

  • Serial Interface: 9600 RS232C
  • +5V Power Supply: Low-dropout voltage regulator with input protection
  • 40-pin header for CPU bus
  • 40-pin header for user port, 8255 and 8254
  • 16-pin header for simple GPIO port
  • onboard logic probe power supply

  • Test button for single pulse generation to the interrupt pins
  • Brownout Protection
  • No jumper settings

Software Features:

  • Enter the machine code in hexadecimal
  • Single-Step execution
  • Examine and modify user registers
  • Run user code with software breakpoint
  • Built-in LCD drivers
  • Download Intel Hex file
  • Disassemble machine code into 8085 instructions
  • Display user registers and disassemble the instruction after single-stepping
  • NVRAM Bootable: runs user program when power up.

Learn more features and how easy using the board here in User's Manual.

Ordering Information

Kit components
-MTK-85 8085 Trainer board
16x2 LCD module
-RS232C Cable
- AC adapter input 100-240VAC output +6V 1000mA
Monitor source code (4291 lines, 61 pages) in pdf format

International Shipping Cost

Thailand EMS

please email your location for the shipping cost.

Complete Kit includes MTK-85 board, 16x2 LCD, AC adapter, monitor source code, + free RS232 cable.

More Information and quote please contact: Wichit Sirichote


Intel Hex file monitor program
and PLD's JEDEC file
Complete Hardware Schematic

8085 Microprocessor Online Articles Technical notes of MTK-85 board and sample code.

Hardware Schematic