fix relative jump disasm

cpu.go

@@ -16,10 +16,9 @@ func NewCPU(core MemIoRW) *CPU {
 	z.core = core
 	z.cycleCount = 0
 	z.codeCoverageEnabled = false
-	// z.codeCoverage = make(map[uint16]bool)
 	// z.memAccess =
 	z.codeCoverageEnabled = false
-	// z.codeCoverage         map[uint16]bool
+	z.codeCoverage = map[uint16]bool{}
 	z.extendedStackEnabled = false
 	//z.extendedStack        [65536]uint8
 	z.extendedStack = map[uint16]PushValueType{}

dis/z80disasm.go

@@ -39,12 +39,12 @@ func (d *Disassembler) jp(op, cond string) string {
 }
 
 func (d *Disassembler) jr(op, cond string) string {
-	addr := d.pc
+	addr := d.pc + 1
 	offset := d.getByte()
 	if offset&0x80 != 0 {
 		addr += 0xFF00 | uint16(offset)
 	} else {
-		addr += d.pc + uint16(offset)
+		addr += uint16(offset)
 	}
 	if cond != "" {
 		cond += sep

dis/z80disasm_test.go

@@ -90,3 +90,25 @@ func Test_JP_nn(t *testing.T) {
 		t.Errorf("Error disassm JP nn, result '%s', expected '%s'", res, expected)
 	}
 }
+
+var testJRf = []byte{0x28, 0x09} // JR Z,+9
+
+func Test_JR_Z_nn(t *testing.T) {
+	expected := "  31EF JR Z, 0x31FA" // PC+2+9
+	setMemory(0x31EF, testJRf)
+	res := disasm.Disassm(0x31EF)
+	if res != expected {
+		t.Errorf("Error disassm JR Z,nn, result '%s', expected '%s'", res, expected)
+	}
+}
+
+var testJRb = []byte{0x18, 0xf1} // JR Z,+9
+
+func Test_JR_mnn(t *testing.T) {
+	expected := "  31F8 JR 0x31EB" // JR back
+	setMemory(0x31F8, testJRb)
+	res := disasm.Disassm(0x31F8)
+	if res != expected {
+		t.Errorf("Error disassm JR -nn, result '%s', expected '%s'", res, expected)
+	}
+}

go.mod

@@ -1,6 +1,6 @@
 module github.com/romychs/z80go
 
-go 1.25
+go 1.24
 
 require github.com/sirupsen/logrus v1.9.4