From ae3bb9819aad653d6a2ed972000e3c3696e39bf1 Mon Sep 17 00:00:00 2001 From: James Barnett Date: Mon, 16 Jul 2018 21:27:33 +0100 Subject: Implement JUMP ops --- src/main/kotlin/cpu/Registers.kt | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'src/main/kotlin/cpu/Registers.kt') diff --git a/src/main/kotlin/cpu/Registers.kt b/src/main/kotlin/cpu/Registers.kt index 54539a8..81db1b0 100644 --- a/src/main/kotlin/cpu/Registers.kt +++ b/src/main/kotlin/cpu/Registers.kt @@ -131,6 +131,14 @@ class Registers { return currentSP } + fun addSignedByteToPC(byte: Int) { + PC = if (bm.isSignedByteNegative(byte)) { + (PC - bm.getAbsoluteValue(byte)) and 0xFFFF + } else { + (PC + bm.getAbsoluteValue(byte)) and 0xFFFF + } + } + fun getFlag(flag: Flag): Int { return (F shr flag.bitPosition) and 0x01 } -- cgit v1.2.3