diff options
Diffstat (limited to 'src/emu/bus/a2bus/a2hsscsi.c')
-rw-r--r-- | src/emu/bus/a2bus/a2hsscsi.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/src/emu/bus/a2bus/a2hsscsi.c b/src/emu/bus/a2bus/a2hsscsi.c index 3c74d555371..e42fef2da05 100644 --- a/src/emu/bus/a2bus/a2hsscsi.c +++ b/src/emu/bus/a2bus/a2hsscsi.c @@ -3,10 +3,10 @@ a2hsscsi.c Implementation of the Apple II High Speed SCSI Card - + This uses an ASIC called "Sandwich II"; the card itself is sometimes known as "Cocoon". - + Notes: C0n0-C0n7 = NCR5380 registers in normal order C0n8 = DMA address low @@ -17,7 +17,7 @@ C0nD = Enable DMA / reset 5380 C0nE = Priority (read bits 5-7) / Fire watchdog (write bit 7) / RAM bank (write bits 0-3) C0nF = DMA speed (bit 7 = 0 for fast, 1 for slow) / ROM bank (write bits 0-4) - + DMA control register (C0nC): 0x01 = pseudo-DMA enable 0x02 = DMA enable @@ -27,13 +27,13 @@ 0x20 = 5380 IRQ enable 0x40 = system DMA status (read only) 0x80 = DMA stopped due to IRQ - + Enable DMA / reset 5380 register (C0nD): 0x01 = Resume DMA after rollover or IRQ 0x02 = Reset the 5380 0x40 = Clear test mode 0x80 = Set test mode - + *********************************************************************/ #include "a2hsscsi.h" @@ -182,9 +182,9 @@ UINT8 a2bus_hsscsi_device::read_c0nx(address_space &space, UINT8 offset) break; case 0xc: - return 0x00; // indicate watchdog? + return 0x00; // indicate watchdog? - case 0xe: // code at cf32 wants to RMW this without killing the ROM bank + case 0xe: // code at cf32 wants to RMW this without killing the ROM bank return m_c0ne; case 0xf: |