Re: [comp.sys.cbm] New commodore hard drive controller

From: MagerValp (
Date: 2002-08-21 11:51:56

>>>>> "MM" == Marko Mäkelä <Marko.Makela@HUT.FI> writes:

AD> I have finally finished my hard drive controller for the commodore
AD> 8-bit computers. 

AD> It enables commodore computers with an IEC serial port (VIC-20, C-64,
AD> C-128) to connect to standard ATA hard drives. 

AD> You can find all schematics and source code on my web-page:

MM> Did everyone notice this? The board looks a bit big, with no
MM> surface-mounted components, and I think the ATmega103 would
MM> provide an almost single-chip solution, even with a built-in
MM> real-time clock.

Yes, it's a pretty interesting project, but as Asbjorn says he doesn't
expect anyone to actually build the thing. But if you could reduce the
component count and print a couple of PCBs... JiffyDOS compatibility
would also make it even more interesting.

On a similar note I've been thinking about how to connect an IDE drive
to the C64 using no active components, only cables and connectors. I
think I've figured it out, but I'm not sure if it'll actually work:

  C64			IDE

  User Port PB0..PB7	D0..D7
  User Port PA2		/CS0
  Joy 2 b0..b2		A0..A2
  Joy 2 b3		/RD
  Joy 2 b4		/WR

/IORDY is tied low, D0..D7, A0..A2, and /RD or /WR are set up, and
then you strobe /CS0 to read or write a register. This isn't quite
according to the IDE spec, but it seems like it might work. I think I
saw a spare IDE cable in the junk heap at work...

    ___          .     .  .         .       . +  .         .      o   
  _|___|_   +   .  +     .     +         .  Per Olofsson, arkadspelare
    o-o    .      .     .   o         +
     -       +            +    .

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