6309E Serial Port Computer

Use this forum to describe how you are using, or planning to use, the parts kits generously donated to a number of members by Lez Anderson
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Martin A
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Joined: 09 Nov 2013 21:03

6309E Serial Port Computer

Post by Martin A » 01 Oct 2014 19:29

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


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.
Wiring side.jpg
Not a whole lot of wiring, once the ACIA,CPU and memory are linked up
Wiring side.jpg (94.38 KiB) Viewed 1796 times
Component side powered.jpg
View from the top with the power on
Component side powered.jpg (87.41 KiB) Viewed 1796 times
And working.jpg
This is what the terminal Software on the PC displays
And working.jpg (43.58 KiB) Viewed 1796 times
The source code for the rom, links to the assembler and other useful bits are all on Grant's pages.

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Joined: 14 Aug 2012 15:31

Re: 6309E Serial Port Computer

Post by lezanderson » 11 Oct 2014 20:14

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

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

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Re: 6309E Serial Port Computer

Post by 1024MAK » 11 Oct 2014 23:05

Great stuff there Martin :D

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


Martin A
Posts: 414
Joined: 09 Nov 2013 21:03

Re: 6309E Serial Port Computer

Post by Martin A » 11 Oct 2014 23:47

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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