Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-22 16:31:49 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

machine/mos6526.cpp: fix a couple of initial states as per vAmigaTS/showcia1 test

Browse Source
This commit is contained in:
angelosa 2023-12-26 22:02:54 +01:00
parent b051aa35b8
commit 853cc8ecda
1 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/devices/machine/mos6526.cpp
View File

@ -19,6 +19,9 @@
- 8520 read/write
- 5710 read/write
- optimize
- off by one errors in vAmigaTS/showcia1 TODLO (reproducible particularly with -nothrottle)
- flag_w & amigafdc both auto-inverts index pulses, it also fails ICR vAmigaTS/showcia1 test
(expected: 0x00, actual: 0x10)
*/
@ -293,7 +296,10 @@ void mos6526_device::clock_tod()
void mos8520_device::clock_tod()
{
m_tod++;
m_tod &= 0xffffff;
m_tod &= 0x00ffffff;
// unused bits are floating high as per vAmigaTS/showcia1
// FIXME: should really hookup from address_map override instead
m_tod |= 0xff000000;
}
@ -727,8 +733,9 @@ void mos6526_device::device_reset()
m_load_b1 = 0;
m_load_b2 = 0;
m_oneshot_b0 = 0;
m_ta = 0;
m_tb = 0;
// initial state is confirmed floating high as per vAmigaTS/showcia1
m_ta = 0xffff;
m_tb = 0xffff;
m_ta_latch = 0xffff;
m_tb_latch = 0xffff;
m_cra = 0;