6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-12-27 16:31:31 +00:00
Code Issues Projects Releases Wiki Activity

Fixed: the accepted interrupt level now appears on the bus.

Browse Source
This commit is contained in:
Thomas Harte 2019-05-02 15:47:12 -04:00
parent 1d9608efc7
commit 857f74b320
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Processors/68000/Implementation/68000Implementation.hpp
View File

@ -1803,8 +1803,16 @@ template <class T, bool dtack_is_implicit, bool signal_will_perform> void Proces
break; break;
case int(MicroOp::Action::PrepareINT): case int(MicroOp::Action::PrepareINT):
// The INT sequence uses the same storage as the TRAP steps, so this'll get
// the necessary stack work set up.
populate_trap_steps(0, get_status()); populate_trap_steps(0, get_status());
// Mutate neessary internal state — effective_address_[0] is exposed
// on the data bus as the accepted interrupt number during the interrupt
// acknowledge cycle, with the low bit set since a real 68000 uses the lower
// data strobe to collect the corresponding vector byte.
accepted_interrupt_level_ = interrupt_level_ = bus_interrupt_level_; accepted_interrupt_level_ = interrupt_level_ = bus_interrupt_level_;
effective_address_[0].full = 1 | (accepted_interrupt_level_ << 1);
break; break;
case int(MicroOp::Action::PrepareINTVector): case int(MicroOp::Action::PrepareINTVector):