afternoon project: let's fix up this Amiga 4000. 
it has a Video Toaster Flyer inside, but the cables are a huge mess. also they seem to require an external drive enclosure.
i want to replace the two (!) internal IDE drives with this SD-to-IDE adapter. but where to put it?
well, this "expansion" port isn't doing much.
quick printed an adapter bracket
ready to be installed!
here we go! i crimped up a short little IDE cable because, conveniently, the motherboard connector lines up just right.
see this is great: no ugly front panel hacks, no ugly gotek, no ugly 3d-printed faceplaces. just this unobtrusive SD card slot in the back of the machine.
i need the space where the original hard drives went because i have to install these two SCSI-3 drives for the Toaster Flyer. yes, made up some custom crimped SCSI cables too. as a bonus, there's still space if i want to install a 3rd drive for the Flyer's port 3 (audio drive)
time for a little formatting. these drives are fast enough they should be able to handle HQ5 video.
Toaster software runs, however...
when i launch the Flyer software, i get to see what i was hoping i wouldn't have to see. 😐
hmm, guru 0x8000000x is apparently a memory error and can be due to data getting corrupted off the disk.
i'm going to try setting the "Mask" value in HDToolBox to 0x1FE00 instead of...whatever it was before. lots of Fs or something.
oh yeah, that fixed it!
quick update: turns out it is the max_transfer that should be 0x1fe00. max_transfer sets the maximum single transfer size to 255 sectors (0x1fe00 = 255 * 512).
the mask parameter, on the other hand, sets the allowable addresses for DMA. my mistake previously forced DMA transfers to be less than 255 sectors which "solved" the problem--but made reads and writes really slow.
apparently the mask value of 0x1fe00 is wrong and forces DMA transfers to happen in chip memory which makes transfers really slow.
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