Kernel: n8vem-mark4: Optimise SD SPI routines to run faster, and drop
the large precomputed table. Rename block send/receive routines with
clearer names.
Kernel: Minor improvements to prompting for boot device number, no
longer tries to parse junk left in the command line buffer at 0x0081.
msx2: fix rom bootstrap
Merge pull request #36 from willsowerbutts/toupstream2

Minor improvements to prompting for boot device number
Merge pull request #35 from willsowerbutts/toupstream

n8vem-mark4: Optimise SD SPI routines to be faster, smaller
Merge pull request #34 from geijoenr/master

msx2: fix rom bootstrap
Merge remote-tracking branch 'alan/master'