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author AJR <ajrhacker@users.noreply.github.com>2018-05-20 10:03:30 -0400
committer AJR <ajrhacker@users.noreply.github.com>2018-05-20 10:03:30 -0400
commitba6e4cdae04d1d33244faf618dda459d00530c45 (patch)
treee40bb04af69af66a18e08b2f162c3342ea03d9a0
parent603ae89155e0bace1f7ba00de48332ef452265e9 (diff)
cit101: Performance hack and note (nw)
-rw-r--r--src/mame/drivers/cit101.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mame/drivers/cit101.cpp b/src/mame/drivers/cit101.cpp
index 96ccac0ef98..7eab898268e 100644
--- a/src/mame/drivers/cit101.cpp
+++ b/src/mame/drivers/cit101.cpp
@@ -379,9 +379,11 @@ MACHINE_CONFIG_START(cit101_state::cit101)
MCFG_DEVICE_ADD("pit0", PIT8253, 0)
MCFG_PIT8253_CLK0(6.144_MHz_XTAL / 4)
MCFG_PIT8253_CLK1(6.144_MHz_XTAL / 4)
- MCFG_PIT8253_CLK2(6.144_MHz_XTAL / 4)
+ //MCFG_PIT8253_CLK2(6.144_MHz_XTAL / 4)
MCFG_PIT8253_OUT0_HANDLER(WRITELINE("auxuart", i8251_device, write_txc))
MCFG_PIT8253_OUT1_HANDLER(WRITELINE("auxuart", i8251_device, write_rxc))
+ // OUT2 might be used for an internal expansion similar to the VT100 STP.
+ // The output appears to be fixed to a 307.2 kHz rate; turning this off boosts driver performance.
MCFG_DEVICE_ADD("pit1", PIT8253, 0)
MCFG_PIT8253_CLK0(6.144_MHz_XTAL / 4)