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-rw-r--r--src/Makefile18
-rw-r--r--src/exit.c56
-rw-r--r--src/exit.h39
-rw-r--r--src/zx81.c152
-rw-r--r--src/zx81.h49
5 files changed, 308 insertions, 6 deletions
diff --git a/src/Makefile b/src/Makefile
index 784e345..5ebcd48 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -18,7 +18,7 @@
#
# -------------------------------------------------------------------------
#
-# $Id: Makefile,v 1.1.1.1 2003-12-17 01:36:18 ianc Exp $
+# $Id: Makefile,v 1.2 2003-12-17 16:55:42 ianc Exp $
#
@@ -32,17 +32,23 @@ TARGET = ezx81
Z80LIB = z80/z80.a
-SOURCE = ezx81.c
+SOURCE = ezx81.c \
+ zx81.c \
+ exit.c
-OBJECTS = ezx81.o
+OBJECTS = ezx81.o \
+ zx81.o \
+ exit.o
EMMA = emma
-CFLAGS += -Iz80
+CFLAGS += -Iz80 `sdl-config --cflags`
+
+LIBS = $(Z80LIB) `sdl-config --libs`
$(TARGET): $(OBJECTS) $(Z80LIB)
- $(CC) $(CFLAGS) -o $(TARGET) $(OBJECTS) $(Z80LIB)
+ $(CC) $(CFLAGS) -o $(TARGET) $(OBJECTS) $(LIBS)
$(EMMA): $(EMMA).o $(Z80LIB)
$(CC) $(CFLAGS) -o $(EMMA) $(EMMA).o $(Z80LIB)
@@ -51,7 +57,7 @@ $(Z80LIB): z80/*.[ch]
cd z80; make ; cd ..
clean:
- rm -f $(TARGET) $(OBJECTS) core
+ rm -f $(TARGET) $(EMMA) $(EMMA).o $(OBJECTS) core
cd z80; make clean; cd ..
depend:
diff --git a/src/exit.c b/src/exit.c
new file mode 100644
index 0000000..3b5e12d
--- /dev/null
+++ b/src/exit.c
@@ -0,0 +1,56 @@
+/*
+
+ ezx81 - X11 ZX81 emulator
+
+ Copyright (C) 2003 Ian Cowburn (ianc@noddybox.demon.co.uk)
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ -------------------------------------------------------------------------
+
+ Provides a common error exit point
+
+*/
+static const char ident[]="$Id$";
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include "exit.h"
+
+#include <SDL.h>
+
+static const char ident_h[]=EZX81_EXIT_H;
+
+
+/* ---------------------------------------- EXPORTED INTERFACES
+*/
+void Exit(const char *format,...)
+{
+ va_list va;
+
+ if (SDL_WasInit(SDL_INIT_EVERYTHING))
+ {
+ SDL_Quit();
+ }
+
+ va_start(va,format);
+ vfprintf(stderr,format,va);
+ va_end(va);
+
+ exit(EXIT_FAILURE);
+}
+
+
+/* END OF FILE */
diff --git a/src/exit.h b/src/exit.h
new file mode 100644
index 0000000..b3a216b
--- /dev/null
+++ b/src/exit.h
@@ -0,0 +1,39 @@
+/*
+
+ ezx81 - X11 ZX81 emulator
+
+ Copyright (C) 2003 Ian Cowburn (ianc@noddybox.demon.co.uk)
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ -------------------------------------------------------------------------
+
+ Provides a common error exit point
+
+*/
+
+#ifndef EZX81_EXIT_H
+#define EZX81_EXIT_H "$Id$"
+
+
+/* Exit
+*/
+void Exit(const char *format,...);
+
+
+#endif
+
+
+/* END OF FILE */
diff --git a/src/zx81.c b/src/zx81.c
new file mode 100644
index 0000000..59b5960
--- /dev/null
+++ b/src/zx81.c
@@ -0,0 +1,152 @@
+/*
+
+ ezx81 - X11 ZX81 emulator
+
+ Copyright (C) 2003 Ian Cowburn (ianc@noddybox.demon.co.uk)
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ -------------------------------------------------------------------------
+
+ Provides the emulation for the ZX81
+
+*/
+static const char ident[]="$Id$";
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "zx81.h"
+#include "exit.h"
+
+static const char ident_h[]=EZX81_ZX81_H;
+
+
+/* ---------------------------------------- STATICS
+*/
+static const int ROMLEN=0x2000;
+static const int ROM_SAVE=0x2fc;
+static const int ROM_LOAD=0x347;
+
+static Z80Byte mem[0x10000];
+
+static Z80Word RAMBOT=0;
+static Z80Word RAMTOP=0;
+static Z80Word RAMLEN=0;
+
+
+/* ---------------------------------------- PRIVATE FUNCTIONS
+*/
+void ULA_Video_Shifter(Z80 *z80, Z80Byte val)
+{
+}
+
+
+/* ---------------------------------------- EXPORTED INTERFACES
+*/
+void ZX81_Init(void)
+{
+ /* TODO: Config for ROM
+ */
+ const char rom[]="/files/emu/ROM/zx81.rom";
+ FILE *fp;
+ Z80Word f;
+
+ if (!(fp=fopen(rom,"rb")))
+ Exit("Failed to open ZX81 ROM - %s\n",rom);
+
+ if (fread(mem,1,ROMLEN,fp)!=ROMLEN)
+ {
+ fclose(fp);
+ Exit("ROM file must be %d bytes long\n",ROMLEN);
+ }
+
+ /* Mirror the ROM
+ */
+ memcpy(mem+ROMLEN,mem,ROMLEN);
+
+ RAMBOT=0x4000;
+
+ /* TODO: Memory size (1 or 16K)
+ */
+ RAMLEN=0x2000;
+ RAMTOP=RAMBOT+RAMLEN;
+
+ for(f=RAMBOT;f<=RAMTOP;f++)
+ mem[f]=0;
+}
+
+
+Z80Byte ZX81_ReadMem(Z80 *z80, Z80Word addr)
+{
+ /* Memory reads above 32K invoke the ULA
+ */
+ if (addr>0x7fff)
+ {
+ Z80Byte b;
+
+ /* B6 of R is tied to the IRQ line (only when HSYNC active?)
+ if ((HSYNC)&&(!(z80->R&0x40)))
+ z80->IRQ=TRUE;
+ */
+
+ b=mem[addr&0x7fff];
+
+ /* If bit 6 of the opcode is set the opcode is sent as is to the
+ Z80. If it's not, the byte is interretted by the ULA.
+ */
+ if (b&0x40)
+ {
+ ULA_Video_Shifter(z80,0);
+ }
+ else
+ {
+ ULA_Video_Shifter(z80,b);
+ b=0;
+ }
+
+ return b;
+ }
+ else
+ return mem[addr&0x7fff];
+
+}
+
+
+void ZX81_WriteMem(Z80 *z80, Z80Word addr, Z80Byte val)
+{
+ if (addr>=RAMBOT && addr<=RAMTOP)
+ mem[addr&0x7fff]=val;
+}
+
+
+Z80Byte ZX81_ReadPort(Z80 *z80, Z80Word port)
+{
+ return 0;
+}
+
+
+void ZX81_WritePort(Z80 *z80, Z80Word port, Z80Byte val)
+{
+}
+
+
+Z80Byte ZX81_ReadForDisassem(Z80 *z80, Z80Word addr)
+{
+ return mem[addr&0x7fff];
+}
+
+
+/* END OF FILE */
diff --git a/src/zx81.h b/src/zx81.h
new file mode 100644
index 0000000..0735230
--- /dev/null
+++ b/src/zx81.h
@@ -0,0 +1,49 @@
+/*
+
+ ezx81 - X11 ZX81 emulator
+
+ Copyright (C) 2003 Ian Cowburn (ianc@noddybox.demon.co.uk)
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ -------------------------------------------------------------------------
+
+ Provides the emulation for the ZX81
+
+*/
+
+#ifndef EZX81_ZX81_H
+#define EZX81_ZX81_H "$Id$"
+
+#include "z80.h"
+
+
+/* Initialise the ZX81
+*/
+void ZX81_Init(void);
+
+/* Interfaces for the Z80
+*/
+Z80Byte ZX81_ReadMem(Z80 *z80, Z80Word addr);
+void ZX81_WriteMem(Z80 *z80, Z80Word addr, Z80Byte val);
+Z80Byte ZX81_ReadPort(Z80 *z80, Z80Word port);
+void ZX81_WritePort(Z80 *z80, Z80Word port, Z80Byte val);
+Z80Byte ZX81_ReadForDisassem(Z80 *z80, Z80Word addr);
+
+
+#endif
+
+
+/* END OF FILE */
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