From 0f66f8cd940390c5917614e317e9da8a90d53a1f Mon Sep 17 00:00:00 2001 From: Michael Pavone Date: Sun, 6 Dec 2015 15:42:36 -0800 Subject: IO port pins should read as high from the perspective of a device when they are set as inputs --- io.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'io.c') diff --git a/io.c b/io.c index cab81fb..3624c35 100644 --- a/io.c +++ b/io.c @@ -1164,7 +1164,8 @@ void io_data_write(io_port * port, uint8_t value, uint32_t current_cycle) uint8_t io_data_read(io_port * port, uint32_t current_cycle) { uint8_t control = port->control | 0x80; - uint8_t th = control & port->output & 0x40; + uint8_t output = (control & port->output) | (~control & 0xFF); + uint8_t th = output & 0x40; uint8_t input; switch (port->device_type) { @@ -1207,7 +1208,7 @@ uint8_t io_data_read(io_port * port, uint32_t current_cycle) } case IO_MOUSE: { - uint8_t tr = control & port->output & TR; + uint8_t tr = output & TR; if (th) { if (tr) { input = 0x10; -- cgit v1.2.3