Apple-2-Tools/izapple2
1
0
Fork 0
mirror of https://github.com/ivanizag/izapple2.git synced 2024-12-21 18:29:45 +00:00
Code Issues Projects Releases Wiki Activity

Fastchip alternate mode

Browse Source
This commit is contained in:
Ivan Izaguirre 2020-04-02 21:50:01 +02:00
parent 01099a8ce3
commit b1d7fe6571
1 changed files with 34 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
cardFastChip.go
View File

@ -14,10 +14,11 @@ See:
type cardFastChip struct {
cardBase
unlocked bool
unlockCounter uint8
enabled bool
accelerated bool
unlocked bool
unlockCounter uint8
enabled bool
accelerated bool
configRegister uint8
}
func buildFastChipRom() []uint8 {
@ -43,6 +44,7 @@ func (c *cardFastChip) assign(a *Apple2, slot int) {
} else {
c.unlockCounter = 0
c.unlocked = false
c.enabled = false
}
}, "FASTCHIP-LOCK")
@ -53,20 +55,36 @@ func (c *cardFastChip) assign(a *Apple2, slot int) {
}, "FASTCHIP-ENABLE")
a.io.addSoftSwitchW(0x6d, func(_ *ioC0Page, value uint8) {
if c.unlocked && c.enabled {
newAccelerated := (value > fastChipNormalSpeed)
if newAccelerated == c.accelerated {
// No change requested
return
}
if newAccelerated {
a.requestFastMode()
} else {
a.releaseFastMode()
}
c.accelerated = newAccelerated
if c.enabled {
c.setSpeed(a, value)
}
}, "FASTCHIP-SPEED")
a.io.addSoftSwitchW(0x6e, func(_ *ioC0Page, value uint8) {
if c.enabled {
c.configRegister = value
}
}, "FASTCHIP-CONFIG")
a.io.addSoftSwitchW(0x6f, func(_ *ioC0Page, value uint8) {
if c.enabled && c.configRegister == 0 {
c.setSpeed(a, value)
}
}, "FASTCHIP-CONFIG")
c.cardBase.assign(a, slot)
}
func (c *cardFastChip) setSpeed(a *Apple2, value uint8) {
newAccelerated := (value > fastChipNormalSpeed)
if newAccelerated == c.accelerated {
// No change requested
return
}
if newAccelerated {
a.requestFastMode()
} else {
a.releaseFastMode()
}
c.accelerated = newAccelerated
}