From bc4b495632fef4ffd18c79fa99bf2d236a2f1ac1 Mon Sep 17 00:00:00 2001
From: Peter Ferrie <peter.ferrie@gmail.com>
Date: Mon, 10 Oct 2022 13:58:07 -0700
Subject: [PATCH] fix Z80 offset

---
 src/hw.mockingboard.a | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/hw.mockingboard.a b/src/hw.mockingboard.a
index b56477015..2c512abba 100644
--- a/src/hw.mockingboard.a
+++ b/src/hw.mockingboard.a
@@ -27,7 +27,7 @@
 ;        A/Y clobbered
 ;------------------------------------------------------------------------------
 
-MAGIC_Z80_LOCATION=$FFC
+MAGIC_Z80_LOCATION=$FFD
 
 GetMockingboardStuff
          +ST16 @callback+1
@@ -36,10 +36,11 @@ GetMockingboardStuff
          ; https://github.com/a2-4am/4cade/issues/483
          ; the Mockingboard init can accidentally enable the Softcard Z80
          ; and can crash the machine
-         ; solved by loading a small Z80 routine at $0FFC (FFFCh in the Z80 space):
-         ; $32 $00 $E4 $C3 FC FF which is
+         ; solved by loading a small Z80 routine at $0FFD (FFFDh in the Z80 space):
+         ; $32 $00 $E4 $C3 FD FF which is
+         ; NOP
          ; LD (E400h),A ; card is at $E400 due to memory translation
-         ; JP  FFFCh
+         ; JP  FFFDh
          ; returns the system to 6502 mode and leaves it in the same state as the Z80 after RESET:
          ; ready to execute the instruction at 0000h (from the Z80 perspective)
          ldx   #5