Fastchip alternate mode

cardFastChip.go

@@ -18,6 +18,7 @@ type cardFastChip struct {
 	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")
 
@@ -53,7 +55,27 @@ func (c *cardFastChip) assign(a *Apple2, slot int) {
 	}, "FASTCHIP-ENABLE")
 
 	a.io.addSoftSwitchW(0x6d, func(_ *ioC0Page, value uint8) {
-		if c.unlocked && c.enabled {
+		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
@@ -66,7 +88,3 @@ func (c *cardFastChip) assign(a *Apple2, slot int) {
 	}
 	c.accelerated = newAccelerated
 }
-	}, "FASTCHIP-SPEED")
-
-	c.cardBase.assign(a, slot)
-}