Fix c99 Z80 impl to accept ZEXALL test.

z80/c99/helper.go

@@ -2,19 +2,6 @@ package c99
 
 import log "github.com/sirupsen/logrus"
 
-// GetBit return bit "n" from byte "val"
-func getBit(n byte, val byte) byte {
-	return ((val) >> (n)) & 1
-}
-
-func getBit3(val byte) bool {
-	return (val & 0x08) != 0
-}
-
-func getBit5(val byte) bool {
-	return (val & 0x20) != 0
-}
-
 func (z *Z80) rb(addr uint16) byte {
 	return z.core.MemRead(addr)
 }

z80/c99/opcodes.go

@@ -356,7 +356,8 @@ func (z *Z80) ldi() {
 	// for the calculation of xf/yf on LDI
 	result := val + z.a
 
-	z.updateXY(result)
+	z.xf = result&0x08 != 0 // bit 3
+	z.yf = result&0x02 != 0 // bit 1
 
 	z.nf = false
 	z.hf = false