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