23 Nov
2015
23 Nov
'15
11:38 a.m.
Otherwise it's the RM05 at 256 Meg, if I remember
right. But all those
disks are also expected to expose the actual geometry of the disk. While
fairly straight forward, it do expose you to a rather low level
interface, where you need to do a lot of calculations all the time.
All those old disk controllers expose the disk geometry. I've looked at
it for the specific case of the RK11 and it doesn't look too bad. If it
does turn into a problem, then we'll have a microcontroller on the board
too and I'll punt the calculations to it rather than doing them in the
FPGA. And my third option is to just do the trivial mapping of the
sector/surface/cylinder numbers to LBA and waste space on the flash
device. It's not we're so short of storage space in emulating any
number of RK, RP, or RM class disk packs.