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-rw-r--r--src/mame/video/docastle.cpp7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/mame/video/docastle.cpp b/src/mame/video/docastle.cpp
index b4e3b09e789..43315f5565a 100644
--- a/src/mame/video/docastle.cpp
+++ b/src/mame/video/docastle.cpp
@@ -78,10 +78,15 @@ WRITE8_MEMBER(docastle_state::docastle_colorram_w)
READ8_MEMBER(docastle_state::inputs_flipscreen_r)
{
+ // inputs pass through LS244 non-inverting buffer
+ uint8_t buf = (m_inp2->read_h(space, 0) << 4) | m_inp1->read_h(space, 0);
+
+ // LS273 latches address bits on rising edge of address decode
flip_screen_set(BIT(offset, 7));
m_inp1->write_s(space, 0, offset & 7);
m_inp2->write_s(space, 0, offset & 7);
- return (m_inp2->read_h(space, 0) << 4) | m_inp1->read_h(space, 0);
+
+ return buf;
}
WRITE8_MEMBER(docastle_state::flipscreen_w)