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/*
* Copyright (C) 1996-1998 Szeredi Miklos
* Email: mszeredi@inf.bme.hu
*
* 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. See the file COPYING.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "z80.h"
#include "spperif.h"
#include "spscr.h"
#define SOUNDPORT 0x10
int SPNM(halfframe)(int firsttick, int numlines)
{
int tc, linesleft;
int feport, scline, border;
byte *scrptr;
qbyte cmark = 0;
scrptr = (byte *) SPNM(image);
tc = firsttick - CHKTICK;
for(linesleft = numlines; linesleft; linesleft--) {
DANM(next_scri) = SPNM(scri)[SPNM(scline)];
tc += CHKTICK;
tc = PRNM(step)(tc);
scline = SPNM(scline);
/* store sound */
SPNM(sound_buf)[scline] = DANM(sound_sam);
feport = DANM(ula_outport);
if(feport & SOUNDPORT) DANM(sound_sam) = 240;
else DANM(sound_sam) = 16;
/* change EAR bit, store MIC bit*/
SPNM(fe_outport_time)[scline] = feport;
if(DANM(imp_change)) DANM(ula_inport) ^= 0x40;
DANM(imp_change) = SPNM(tape_impinfo)[scline];
/* Check if updating screen */
if(SPNM(updating)) {
border = SPNM(lastborder);
if((feport & 0x07) != border) {
SPNM(border_update) = 2;
SPNM(lastborder) = feport & 0x07;
}
scrptr = update_screen_line(scrptr, SPNM(coli)[scline], DANM(next_scri),
border, &cmark);
}
SPNM(scline)++;
}
return tc;
}
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