AppleWin/source/Peripheral_Clock_Generic.cpp

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2008-09-04 16:32:21 +00:00
/*
AppleWin : An Apple //e emulator for Windows
Copyright (C) 2008, Michael Pohoreski
AppleWin 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.
AppleWin 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 AppleWin; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Description: Generic No-Slot Clock
*
* Author: Michael Pohoreski
*/
#include "StdAfx.h"
#pragma hdrstop
#include "..\resource\resource.h"
// #include "resource.h" // BUG -- wrong resource!!!
#include <time.h>
/*
Old:
File: PRODOS
BLOAD PRODOS,TSYS,A$2000
CALL-151
2F76:60 5F 5E 5D 5C 5C 60
File offset $0F76-$0F7C:
ProDOS has a built-in clock driver that queries a clock/calendar card for the date and time. After the routine stores that information in the ProDOS Global Page ($BF90-$BF93), either ProDOS or your own application programs can use it. See Figure 6-1.
Figure 6-1. ProDOS Date and Time Locations
49041 ($BF91) 49040 ($BF90)
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
DATE: | year | month | day |
+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
TIME: | hour | | minute |
+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
49043 ($BF93) 49042 ($BF92)
ProDOS recognizes a clock card if the following bytes are present in
the Cn00 ROM:
$Cn00 = $08
$Cn02 = $28
$Cn04 = $58
$Cn06 = $70
The address is preceded by a $4C (JMP) if a clock card is recognized,
or by a $60 (RTS) if not.
The ProDOS clock driver uses the following addresses for its I/O to the
clock:
Cn08 - READ entry point
Cn0B - WRITE entry point
The accumulator is loaded with an #A3 before the JSR to the WRITE
*/
tm* Clock_Util_GetTime()
{
time_t tRawTime;
time( &tRawTime );
tm* pTime = localtime ( &tRawTime );
if( pTime ) {
mktime( pTime ); // get day of week: tm_wday
}
return pTime;
}
void Clock_Util_ConvertTimeToProdos( tm *pTime, unsigned char *pProDosBytes4_ )
{
if( pTime )
{
BYTE nMonth = pTime->tm_mon + 1;
BYTE nDate1 = 0
| ((pTime->tm_mday & 0x1F) << 0)
| ((nMonth & 0x0F) << 5);
BYTE nDate2 = 0
| ((pTime->tm_year % 100) << 1)
| (nMonth >> 3) & 1;
BYTE nTime1 = (pTime->tm_min & 0x3F); // 60 = max(64) 0x3F
BYTE nTime2 = (pTime->tm_hour & 0x1F); // 24 = max(32) 0x1F
pProDosBytes4_[0] = nDate1;
pProDosBytes4_[1] = nDate2;
pProDosBytes4_[2] = nTime1;
pProDosBytes4_[3] = nTime2;
}
}
void Clock_Generic_UpdateProDos()
{
tm* pTime = Clock_Util_GetTime();
Clock_Util_ConvertTimeToProdos( pTime, &mem[ 0xBF90 ] ); // ProDos date/time buffer
}