I have a Simtec 8-bit IDE interface that is fitted to my both my A3000 and A3010. They provide a single 44-pin header internally and a Centronics socket for external IDE devices. Currently I have a 2GB CF card installed and partitioned as four 512MB drives on both machines.
image courtesy of Simtec Electronics
The photo below shows the board fitted to my A3000. You can see the difference between the official Simtec photo and the earlier production version where the mount holes for different types are hard drives are staggered on the older model.
Disc images containing the flash rom software, modules and partitioning tool !IDETool for the Simtec cards.
Simtec still provide flash rom software to update these IDE cards using !SNAFU which is available for download from the Simtec site.