The kit uses Motorola 68B09 as the CPU. I added the UART chip, 6850 ACIA. The circuit is simple and use small number of components. All decoder logics are placed in PLD chip. This makes the circuit is very easy to build. I found cc09 c compiler for 6809. The monitor was developed using c and assembly code. The main clock frequency is 4.9152MHz. UART chip uses E clock, 4.9152MHz/4 as the TXD/RXD clock. The prescaler is 64, so the UART will produce 19,200 bit/s rate. The 6809 has long branch using 16 bit offset. One of the monitor key provides 16-bit HEX calculator. Students can use it for finding the 8-bit or 16-bit offset. For low level coding, we can use hex key to enter and test the program. For c programming, we can use UART for S19 file downloading easily.

Hardware Features:

• CPU: Motorola 68B09, 8-bit Microprocessor @1.2288MHz clock
• Memory: 32kB RAM, 16kB EPROM
• Memory and I/O Decoder chip: Programmable Logic Device GAL16V8D
• Display: high brightness 6-digit 7-segment LED
• Keyboard: 36 keys
• RS232 port: 6850 ACIA 19200 bit/s 8n1
• Debugging LED: 8-bit GPIO1 LED at location $8000
• Tick: 10ms tick produced by 89C2051 for time trigger experiment
• Text LCD interface: direct CPU bus interface text LCD
• Brownout reset: KIA7042 reset chip for power brownout reset
• Expansion header: 40-pin header

More technical details: hardware schematic, monitor source code, program examples, please visit 

https://kswichit.net/6809/6809.htm

Kit is pre-assembled and tested. No LCD, no AC Adapter. 

For DIY kit, Buy it now price gives a free 16x2 LCD. Please add the note "DIY version"

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