summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/bus/a2bus/a2hsscsi.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/emu/bus/a2bus/a2hsscsi.c')
-rw-r--r--src/emu/bus/a2bus/a2hsscsi.c14
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: