On Thu, 5 Mar 2009, Brian Lanning wrote:
  On Thu, Mar 5, 2009 at 5:13 PM, Joachim Thiemann
 <joachim.thiemann at gmail.com> wrote: 
   On Thu, Mar 5,
2009 at 17:03, Gene Buckle <geneb at deltasoft.com> wrote:
 Given this, can one hook a SD/SDHC card to the Amiga parallel port,
 and then write a "sdhc.device" that presents a block device that can
 be put into the Mountlist and be accessed by dos.library or one of the
 ms-dos capable libraries (messydos?) and thus present a non-bootable
 mass storage device for the amiga? ?So, you boot with a custom
 workbench disk, that loads the driver, mounts the SDHC card and then
 startup-sequence hands control over
 to a script on the SDHC card. ?ISTR this was commonly done for romless
 drive addons on the 500 - and I had such a setup for my 1000, where my
 bootup workbech disk loaded the janus drivers and then handed control
 over to a MFM hard disk in the Sidecar. 
 That's starting to sound like a backwards version of this:
http://cgi.ebay.com/Amiga-500-1000-2000-3000-Floppy-Simulator-w-MPDOS-Pro_W…
 
Yes, except that package never worked for me.  The author and I went back
and forth for months, but disk emulation simply wouldn't work.  I hung on
to the package and cabling, though, since it will also emulate a disk for
Atari 800 series machines.  That mode uses bit-banging to talk to the game
ports.
  I've also seen a gadget for the c64 (or was it an
apple 2e?) that
 connects the serial port to a PC.  You run some software on the PC
 which then looks like a hard drive to the old computer.  Like a file
 server over a serial connection. 
There are a family of adapters that let your PC talk to a Commodore 1541
drive, and with the right software the C64 can use the PC as a disk.
Similar thing exists for Atari, BTW.  Different approach from the floppy
simulator.  Instead of bit-banging, it sits on the serial bus with the
disk drives.
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