6309E Serial Port Computer

[Martin A]

Amongst the parts supplied by Lez, I received a 6309E, 6850ACIA and a max232.

Ideal for building one of Grant Searle's serial port connected computers running BASIC

http://searle.hostei.com/grant/6809/Simple6809.html

The 6309E is pin and software compatible with the 6809E, so all I had to do was add the external clock parts, which the 6809 in Grant's design doesn't need, and 8 IC's later I have a basic, BASIC computer, and plenty of room on the eurocard sized board for any extra bits I feel like adding.

Not a whole lot of wiring, once the ACIA,CPU and memory are linked up

Wiring side.jpg (94.38 KiB) Viewed 30397 times

View from the top with the power on

Component side powered.jpg (87.41 KiB) Viewed 30397 times

This is what the terminal Software on the PC displays

And working.jpg (43.58 KiB) Viewed 30397 times

The source code for the rom, links to the assembler and other useful bits are all on Grant's pages.

[lezanderson]

Good to see the ICs being used.....

Would look great with a V9958 board attached... sort of a Super Ultim809..

[1024MAK]

Great stuff there Martin

What circuit did you use for the Q and E clock ?

Mark

[Martin A]

I got the Q E circuit from the 6309E data sheet, it was a little bit simpler than the 6809E version

Since the 74LS76 seems to be obsolete, I used a 74HC109 instead. The K input is inverted, but I had some spare gates on the HC04 next door to invert that input.

6309E clock.pdf

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