diff options
Diffstat (limited to 'src/emu/bus/a2bus/a2scsi.c')
-rw-r--r-- | src/emu/bus/a2bus/a2scsi.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/emu/bus/a2bus/a2scsi.c b/src/emu/bus/a2bus/a2scsi.c index d27903464b4..81a88bf1fd4 100644 --- a/src/emu/bus/a2bus/a2scsi.c +++ b/src/emu/bus/a2bus/a2scsi.c @@ -15,18 +15,18 @@ C0na = RAM and ROM bank switching C0nb = reset 5380 C0nc = set IIgs block mode - C0nd = set pseudo-DMA + C0nd = set pseudo-DMA C0ne = read DRQ status in bit 7 - + In IIgs block mode, any read from C800-CBFF window fetches the next byte from the 5380's DMA port. This lets you use the 65816 MVN/MVP operations to burst-transfer up to 1K at a time. (Requires a cycle-by-cycle haltable 65816 core; don't install the - GS/OS driver right now to avoid this) - + GS/OS driver right now to avoid this) + Pseudo-DMA works similarly to the Mac implementation; use C0n8 to read/write "DMA" bytes in that mode. - + *********************************************************************/ #include "a2scsi.h" |