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i8255: Refactor to make clear the exact sequences of actions acka_r and ackb_r correspond to (nw)

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This commit is contained in:
AJR 2018-08-21 14:30:15 -04:00
parent 6bf57e9b14
commit 257a236f6e
1 changed files with 12 additions and 6 deletions
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18
src/devices/machine/i8255.cpp
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@ -835,11 +835,14 @@ uint8_t i8255_device::read_pa()
READ8_MEMBER( i8255_device::acka_r ) READ8_MEMBER( i8255_device::acka_r )
{ {
if (!machine().side_effects_disabled()) if (!machine().side_effects_disabled())
{
pc6_w(0); pc6_w(0);
uint8_t data = read_pa();
if (!machine().side_effects_disabled())
pc6_w(1); pc6_w(1);
}
return read_pa(); return data;
} }
@ -873,11 +876,14 @@ uint8_t i8255_device::read_pb()
READ8_MEMBER( i8255_device::ackb_r ) READ8_MEMBER( i8255_device::ackb_r )
{ {
if (!machine().side_effects_disabled()) if (!machine().side_effects_disabled())
{
pc2_w(0); pc2_w(0);
uint8_t data = read_pb();
if (!machine().side_effects_disabled())
pc2_w(1); pc2_w(1);
}
return read_pb(); return data;
} }