izapple2/cardRamWorks.go
2024-01-06 21:48:23 +01:00

50 lines
1.2 KiB
Go

package izapple2
import (
"fmt"
"strconv"
)
/*
RAMWorks style card on the Apple IIe aus slot.
https://patents.google.com/patent/US4601018
https://ae.applearchives.com/apple_e/ramworks_iii/ramworks_iii_basic_manual_1.pdf
Diagnostics disks:
https://ae.applearchives.com/apple_e/ramworks_iii/ramworks_diagnostics.zip
It's is like the extra 64kb on an Apple IIe 80col 64kb card, but with up to 256 banks
*/
func setupRAMWorksCard(a *Apple2, sizeArg string) error {
size, err := strconv.Atoi(sizeArg)
if err != nil {
return fmt.Errorf("invalid RamWorks card RAM size: %s", sizeArg)
}
if size%64 != 0 {
return fmt.Errorf("the Ramworks size must be a multiple of 64, %v is not", size)
}
a.mmu.initExtendedRAM(size / 64)
ssr := func() uint8 {
return a.mmu.extendedRAMBlock
}
ssw := func(value uint8) {
a.mmu.setExtendedRAMActiveBlock(value)
}
// Does not have a slot assigned
a.io.addSoftSwitchR(0x71, ssr, "RAMWORKSR")
a.io.addSoftSwitchR(0x73, ssr, "RAMWORKSR")
a.io.addSoftSwitchR(0x75, ssr, "RAMWORKSR")
a.io.addSoftSwitchR(0x77, ssr, "RAMWORKSR")
a.io.addSoftSwitchW(0x71, ssw, "RAMWORKSW")
a.io.addSoftSwitchW(0x73, ssw, "RAMWORKSW")
a.io.addSoftSwitchW(0x75, ssw, "RAMWORKSW")
a.io.addSoftSwitchW(0x77, ssw, "RAMWORKSW")
return nil
}