mirror of
https://github.com/freewilll/apple2-go.git
synced 2024-06-12 17:45:38 +00:00
d89c7babf0
This required moving some common things in a new package to resolve a circular dependency between cpu <=> mmu.
28 lines
579 B
Go
28 lines
579 B
Go
package system
|
|
|
|
var (
|
|
PendingInterrupt bool
|
|
PendingNMI bool
|
|
|
|
RunningTests bool
|
|
RunningFunctionalTests bool
|
|
RunningInterruptTests bool
|
|
)
|
|
|
|
// Handle a write to a magic test address that triggers an interrupt and/or an NMI
|
|
func WriteInterruptTestOpenCollector(address uint16, oldValue uint8, value uint8) {
|
|
oldInterrupt := (oldValue & 0x1) == 0x1
|
|
oldNMI := (oldValue & 0x2) == 0x2
|
|
|
|
interrupt := (value & 0x1) == 0x1
|
|
NMI := (value & 0x2) == 0x2
|
|
|
|
if oldInterrupt != interrupt {
|
|
PendingInterrupt = interrupt
|
|
}
|
|
|
|
if oldNMI != NMI {
|
|
PendingNMI = NMI
|
|
}
|
|
}
|