Re: Lego interface card for the A2 ?

["RedskullDC" <RDC@oz.org>]

Hi Laine and Bryan,

>> the card is worthless without the software, the box that sits at the 
>> other
>> end of the card, and the specialized Logo parts it is designed to 
>> control.
>> If you don't have those, pull it out and put it with your other spare 
>> parts."

> The 6522 VIA has 2  8bit bidirectional ports and counters.
>
> It should be fairly easy to trace the foil and determine what addresses 
> C0XX,Slot are needed to set the chip and move the data.
>
> He's half way to all kinds of fun you can have with 16 bits of interface.
>
> The 6522 was the I/O of the commodore 64 so there are plenty of schematics 
> and I'm sure programming examples.

Fairly easy to figure out the addresses. The LS74 is just to delay the 
Phase2
clock line, and the LS245 is just to buffer the data lines.

No worries programming the 6522 in ASM.

I just wondered what it was originally desinged to control.

Cheers,
Red