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/*
* pbi_proto.c - Emulation of a prototype 80 column board for the
* Atari 1090 expansion interface.
*
* Copyright (C) 2007-2008 Perry McFarlane
* Copyright (C) 2002-2008 Atari800 development team (see DOC/CREDITS)
*
* This file is part of the Atari800 emulator project which emulates
* the Atari 400, 800, 800XL, 130XE, and 5200 8-bit computers.
*
* Atari800 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.
*
* Atari800 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 Atari800; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "atari.h"
#include "pbi.h"
#include "pbi_proto80.h"
#include "util.h"
#include "log.h"
#include "memory.h"
#include <stdlib.h>
#define PROTO80_PBI_NUM 2
#define PROTO80_MASK (1 << PROTO80_PBI_NUM)
static UBYTE *proto80rom;
static char proto80_rom_filename[FILENAME_MAX] = "";
int PBI_PROTO80_enabled = FALSE;
#ifdef PBI_DEBUG
#define D(a) a
#else
#define D(a) do{}while(0)
#endif
int PBI_PROTO80_Initialise(int *argc, char *argv[])
{
int i, j;
for (i = j = 1; i < *argc; i++) {
if (strcmp(argv[i], "-proto80") == 0) {
Log_print("proto80 enabled");
PBI_PROTO80_enabled = TRUE;
}
else {
if (strcmp(argv[i], "-help") == 0) {
Log_print("\t-proto80 Emulate a prototype 80 column board for the 1090");
}
argv[j++] = argv[i];
}
}
*argc = j;
if (PBI_PROTO80_enabled) {
proto80rom = (UBYTE *)Util_malloc(0x800);
if (!Atari800_LoadImage(proto80_rom_filename, proto80rom, 0x800)) {
free(proto80rom);
PBI_PROTO80_enabled = FALSE;
Log_print("Couldn't load proto80 rom image");
return FALSE;
}
else {
Log_print("loaded proto80 rom image");
PBI_D6D7ram = TRUE;
}
}
return TRUE;
}
int PBI_PROTO80_ReadConfig(char *string, char *ptr)
{
if (strcmp(string, "PROTO80_ROM") == 0)
Util_strlcpy(proto80_rom_filename, ptr, sizeof(proto80_rom_filename));
else return FALSE; /* no match */
return TRUE; /* matched something */
}
void PBI_PROTO80_WriteConfig(FILE *fp)
{
fprintf(fp, "PROTO80_ROM=%s\n", proto80_rom_filename);
}
int PBI_PROTO80_D1GetByte(UWORD addr)
{
int result = PBI_NOT_HANDLED;
if (PBI_PROTO80_enabled) {
}
return result;
}
void PBI_PROTO80_D1PutByte(UWORD addr, UBYTE byte)
{
}
int PBI_PROTO80_D1ffPutByte(UBYTE byte)
{
int result = 0; /* handled */
if (PBI_PROTO80_enabled && byte == PROTO80_MASK) {
memcpy(MEMORY_mem + 0xd800, proto80rom, 0x800);
D(printf("PROTO80 rom activated\n"));
}
else result = PBI_NOT_HANDLED;
return result;
}
UBYTE PBI_PROTO80_GetPixels(int scanline, int column)
{
#define PROTO80_ROWS 24
#define PROTO80_CELL_HEIGHT 8
UBYTE character;
UBYTE invert;
UBYTE font_data;
int row = scanline / PROTO80_CELL_HEIGHT;
int line = scanline % PROTO80_CELL_HEIGHT;
if (row >= PROTO80_ROWS) {
return 0;
}
character = MEMORY_mem[0x9800 + row*80 + column];
invert = 0x00;
if (character & 0x80) {
invert = 0xff;
character &= 0x7f;
}
font_data = MEMORY_mem[0xe000 + character*8 + line];
font_data ^= invert;
return font_data;
}
/*
vim:ts=4:sw=4:
*/
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