Retrochallenge 2017/04

It is rumoured that Bill Gates said the Motorola MC6809 CPU was the best 8-bit CPU ever produced. This might have been the case until Hitachi came out with the HD6309. This CPU was thought to be a clone of the MC6809. However, in April of 1988, the Japanese “Oh!FM” magazine published an article that showed the HD6309 has hidden features! It wasn’t until a few years later that these features were discovered outside of Japan.

The HD6309 has additional registers, offers interruptible block transfers, executes some instructions faster and even includes a hardware 16×16 multiply operation! This then, must be, without a shadow of a doubt, for various degrees of doubt, YMMV, the ultimate 8-bit microprocessor ever made!


So naturally, I went on eBay an purchased a few of these processors. They should arrive in a few days — I hope.


When trying to get things done, nothing is better than a deadline! So I have entered the Retrochallenge 2017/04 contest to build a computer around the HD6309. The object of the challenge is to “do something interesting with retro hardware or software” and blog about it. It commences 1st April 2017 and runs until 30th April 2017.

Let the fun begin!



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