Christian Groessler
969049face
atrtimer.s: initialize the interrupt variables before enabling the interrupt
2017-09-25 17:07:25 +02:00
Christian Groessler
24b663ef26
atrtimer.s, vic20timer.s: use decimal mode in interrupt handler
...
Using decimal mode (SED/CLD) reduces the memory footprint and execution time
of the interrupt routine. Some comments were added or fixed, too.
2017-09-24 02:29:42 +02:00
Christian Groessler
84acda26ce
Adapt Atari timer code to PAL systems.
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The vertical blank interrupt (which is used by the timer) runs with
60Hz on NTSC systems and 50Hz on PAL systems.
This commit also clears 'vbichain' in 'timer_exit', so a subsequent
'timer_init' would do the right thing.
2017-09-12 14:14:14 +02:00
Christian Groessler
92957893c6
replace absolute values with defines from atari.inc
2015-09-09 14:04:07 +02:00
Oliver Schmidt
6987df44ed
Added support for the ATARI 8-bit with Dragon Cart.
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The actual ATARI-specific code is "inspired" by the IP65 variant published in http://atariage.com/forums/topic/211161-dragoncart-software/?p=2734494 . The timer routines are modeled after the ones for the VIC20.
2015-08-28 15:19:52 +02:00
