izapple2/cardThunderClockPlus.go
2024-01-27 17:21:54 +01:00

68 lines
1.5 KiB
Go

package izapple2
import "github.com/ivanizag/izapple2/component"
/*
ThunderClock`, real time clock card.
See:
https://ia800706.us.archive.org/22/items/ThunderClock_Plus/ThunderClock_Plus.pdf
https://prodos8.com/docs/technote/01/
https://www.semiee.com/file/backup/NEC-D1990.pdf
uPD1990AC hookup:
bit 0 = data in
bit 1 = CLK
bit 2 = STB
bit 3 = C0
bit 4 = C1
bit 5 = C2
bit 7 = data out
*/
// CardThunderClockPlus represents a ThunderClock+ card
type CardThunderClockPlus struct {
cardBase
upd1990 component.MicroPD1990ac
}
func newCardThunderClockPlusBuilder() *cardBuilder {
return &cardBuilder{
name: "ThunderClock+ Card",
description: "Clock card",
buildFunc: func(params map[string]string) (Card, error) {
var c CardThunderClockPlus
err := c.loadRomFromResource("<internal>/ThunderclockPlusROM.bin")
if err != nil {
return nil, err
}
return &c, nil
},
}
}
func (c *CardThunderClockPlus) assign(a *Apple2, slot int) {
c.addCardSoftSwitchR(0, func() uint8 {
bit := c.upd1990.Out()
// Get the next data bit from uPD1990AC on the MSB
if bit {
return 0x80
}
return 0
}, "THUNDERCLOCKR")
c.addCardSoftSwitchW(0, func(value uint8) {
dataIn := (value & 0x01) == 1
clock := ((value >> 1) & 0x01) == 1
strobe := ((value >> 2) & 0x01) == 1
command := (value >> 3) & 0x07
/* fmt.Printf("[cardThunderClock] dataIn %v, clock %v, strobe %v, command %v.\n",
dataIn, clock, strobe, command) */
c.upd1990.In(clock, strobe, command, dataIn)
}, "THUNDERCLOCKW")
c.cardBase.assign(a, slot)
}