Don't lock up CPU if performing a read with writes configured when in PBC mode. Allow access to VDP debug commands from Z80 debugger in PBC mode. Handle Mode 4 in VDP debug print functions

1 files changed, 3 insertions, 0 deletions

diff --git a/backend.h b/backend.h
index ae80846..56c872e 100644
--- a/backend.h
+++ b/backend.h
@@ -76,6 +76,8 @@ typedef struct {
 	write_8_fun  write_8;
 } memmap_chunk;
 
+#include "system.h"
+
 typedef struct {
 	uint32_t flags;
 	native_map_slot    *native_code_map;
@@ -90,6 +92,7 @@ typedef struct {
 	code_ptr           handle_code_write;
 	code_ptr           handle_align_error_write;
 	code_ptr           handle_align_error_read;
+	system_str_fun_r8  debug_cmd_handler;
 	uint32_t           memmap_chunks;
 	uint32_t           address_mask;
 	uint32_t           max_address;