[Nottingham] Arduino (Hardware bit-twiddling fun)

Martin martin at ml1.co.uk
Fri Feb 15 19:49:06 GMT 2008

Peter Woods wrote:
>> Peter Woods wrote:
>> [---]
>>> I've got (don't ask) a KURTA graphics pad with a((n old)MAC interface))
> The i/f is called ADB and is definitely NOT RS232 or TTY.
> Here is a starter page:
> http://pinouts.ru/Slots/apple_adb_pinout.shtml

"Apple Desktop Bus (or ADB) is a bit-serial computer bus" ... "requests
took the form of single-byte strings"

...But still byte serial that you could squirt into a U(S)ART with
suitable level shifting... such as quite possibly used on a RS232

> There are explanations of the protocol (and of the cheap-jack origins of
> the design)

And that is where the decider is. You might just get away with OC
outputs and resistor pull-ups or you might need something more
elaborate, or it might just need a straight connection...

> [then again I was taught that an Engineer was someone who could build
> something for half a crown ~ etc, etc.]
> to be found through Google.
> Basically, the s/w does all the work, keeps the h/w cheap, UNTIL you
> have to emulate it!

Looks like the Arduino could make easy work of it ;-)

> Anyway, where is the challenge in chucking £500 at buying a new (A3
> WaCom) tablet?

Go for A5 and you get well below £50...

You in for an Arduino?


Martin Lomas
martin at ml1.co.uk

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