From: kub <derkub@gmail.com>
Date: Wed, 23 Jun 2021 17:13:54 +0000 (+0200)
Subject: z80, fix cz80 CPU reset (most regs not touched by reset)
X-Git-Tag: v2.00~507
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca8b001b7ffb5141ff6b684cdacf1f8241acbdaa;p=picodrive.git

z80, fix cz80 CPU reset (most regs not touched by reset)
---

diff --git a/cpu/cz80/cz80.c b/cpu/cz80/cz80.c
index 7f432bda..82de13f8 100644
--- a/cpu/cz80/cz80.c
+++ b/cpu/cz80/cz80.c
@@ -211,7 +211,8 @@ void Cz80_Init(cz80_struc *CPU)
 
 void Cz80_Reset(cz80_struc *CPU)
 {
-	memset(CPU, 0, (FPTR)&CPU->BasePC - (FPTR)CPU);
+	// I, R, CPU and interrupts logic is reset, registers are untouched
+	memset(&CPU->R, 0, (FPTR)&CPU->BasePC - (FPTR)&CPU->R);
 	Cz80_Set_Reg(CPU, CZ80_PC, 0);
 }