diff options
author | 2018-08-21 14:30:15 -0400 | |
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committer | 2018-08-21 14:32:04 -0400 | |
commit | 257a236f6e550519a501e1745674aba9ae6bb03d (patch) | |
tree | 947bd4066533cd49458004e36f98ea98a1276722 | |
parent | 6bf57e9b143ee92f6a87cbf8ae8813add840feb6 (diff) |
i8255: Refactor to make clear the exact sequences of actions acka_r and ackb_r correspond to (nw)
-rw-r--r-- | src/devices/machine/i8255.cpp | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/src/devices/machine/i8255.cpp b/src/devices/machine/i8255.cpp index 3feae0a736e..15f646efd57 100644 --- a/src/devices/machine/i8255.cpp +++ b/src/devices/machine/i8255.cpp @@ -835,11 +835,14 @@ uint8_t i8255_device::read_pa() READ8_MEMBER( i8255_device::acka_r ) { if (!machine().side_effects_disabled()) - { pc6_w(0); + + uint8_t data = read_pa(); + + if (!machine().side_effects_disabled()) pc6_w(1); - } - return read_pa(); + + return data; } @@ -873,11 +876,14 @@ uint8_t i8255_device::read_pb() READ8_MEMBER( i8255_device::ackb_r ) { if (!machine().side_effects_disabled()) - { pc2_w(0); + + uint8_t data = read_pb(); + + if (!machine().side_effects_disabled()) pc2_w(1); - } - return read_pb(); + + return data; } |