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("/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) }