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/*
* vdc.c - Fake VDC emulation for the C128 emulator.
*
* Written by
* Ettore Perazzoli (ettore@comm2000.it)
*
* This file is part of VICE, the Versatile Commodore Emulator.
* See README for copyright notice.
*
* 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.
*
*/
/* This is just a kludge to make the C128 kernal believe there is an alive
VDC in the system during the power-on self test. */
#include "vice.h"
#include "mem.h"
static int vdc_ptr;
static BYTE vdc[0x100];
void REGPARM2 store_vdc(ADDRESS addr, BYTE value)
{
if (addr & 1) {
vdc[vdc_ptr] = value;
if (vdc_ptr == 0x1e) {
vdc[0x12] = mem_read(0xa3d);
vdc[0x13] = mem_read(0xa3c);
}
} else {
vdc_ptr = value;
}
}
BYTE REGPARM1 read_vdc(ADDRESS addr)
{
if (addr & 1) {
if (vdc_ptr == 0x12)
return mem_read(0xa3d);
else if (vdc_ptr == 0x13)
return mem_read(0xa3c);
return ((vdc_ptr < 37) ? vdc[vdc_ptr] : 0xff);
} else
return 0x9f;
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.