From: Raymond C. Bryan (raycomp_at_visi.com)
Date: 2005-07-24 21:47:05
>> I disassembled the code and it would toggle and wiggle a lot of
>>$dc00/$dc01 registers; the code is at $4000-4200. This means
>>someone obviously constructed a very weird PC-to-c64-Joystickport
>>connector. Whilst it is clear that this would be able to transfer
>>data from PC to the 64, it is beyond my imagination how this
>>hardware would ever allow one to transfer data from the 64 to the
>>PC, since the joyports are, naturally, readonly.
>>
>Naturally, they are not. They are read write ports. I think the
>cable does nybble copying to the PC parallel port, which is also
>read/write on most newer parallel port implementations.
>
>To all: I've heard this myth of joyports being read-only often. Is
>it because the joysticks are read-only?
I seem to recall someone writing about in-out hardware hacks in
Commodore/powerplay magazines. May have been a whole book of
hardware hacks that included some of those.
--Ray
--
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|Raymond C. Bryan 651-642-9890 vox | The battle is sometimes |
|Raymond Computer 651-642-9891 fax | to the small for
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|USA Amiga - Commodore | -- James Thurber -- |
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