mirror of
https://github.com/ivanizag/izapple2.git
synced 2024-09-07 14:54:27 +00:00
68 lines
1.5 KiB
Go
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", cardRomUpper)
|
|
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)
|
|
}
|