diff options
Diffstat (limited to 'src/mess/machine/cs4031.c')
-rw-r--r-- | src/mess/machine/cs4031.c | 50 |
1 files changed, 25 insertions, 25 deletions
diff --git a/src/mess/machine/cs4031.c b/src/mess/machine/cs4031.c index 60056017267..974697e2ce0 100644 --- a/src/mess/machine/cs4031.c +++ b/src/mess/machine/cs4031.c @@ -16,13 +16,13 @@ - 8254 timer - MC14818 RTC - TODO: - - The chipset has the ability to intercept the GATEA20 and - RESET commands sent to the 8042 keyboard controller, - this is not emulated yet - - No emulation of memory parity checks - - Move IPC core to its own file so it can be shared with - other chipsets + TODO: + - The chipset has the ability to intercept the GATEA20 and + RESET commands sent to the 8042 keyboard controller, + this is not emulated yet + - No emulation of memory parity checks + - Move IPC core to its own file so it can be shared with + other chipsets ***************************************************************************/ @@ -459,9 +459,9 @@ void cs4031_device::update_dma_clock() //************************************************************************** /* - Check NMI sources and generate NMI if needed + Check NMI sources and generate NMI if needed - Not emulated here: Parity check NMI + Not emulated here: Parity check NMI */ void cs4031_device::nmi() { @@ -774,10 +774,10 @@ WRITE_LINE_MEMBER( cs4031_device::kbrst_w ) } /* - Fast CPU reset and Gate A20 + Fast CPU reset and Gate A20 - 0 - Fast CPU reset - 1 - Fast Gate A20 + 0 - Fast CPU reset + 1 - Fast Gate A20 */ WRITE8_MEMBER( cs4031_device::sysctrl_w ) @@ -804,16 +804,16 @@ WRITE8_MEMBER( cs4031_device::sysctrl_w ) //************************************************************************** /* - "Port B" - AT-compatible port with miscellaneous information - - 0 - Timer 2 gate (rw) - 1 - Speaker data (rw) - 2 - Enable parity check (rw) [not emulated] - 3 - Enable IOCHECK (rw) - 4 - Refresh detect (r) - 5 - Timer 2 output (r) - 6 - Channel check latch (r) - 7 - Parity check latch (r) [not emulated] + "Port B" - AT-compatible port with miscellaneous information + + 0 - Timer 2 gate (rw) + 1 - Speaker data (rw) + 2 - Enable parity check (rw) [not emulated] + 3 - Enable IOCHECK (rw) + 4 - Refresh detect (r) + 5 - Timer 2 output (r) + 6 - Channel check latch (r) + 7 - Parity check latch (r) [not emulated] */ READ8_MEMBER( cs4031_device::portb_r ) @@ -845,10 +845,10 @@ WRITE8_MEMBER( cs4031_device::portb_w ) } /* - NMI mask and RTC address + NMI mask and RTC address - 7 - NMI mask - 6:0 - RTC address + 7 - NMI mask + 6:0 - RTC address */ WRITE8_MEMBER( cs4031_device::rtc_w ) { |