izapple2/cardRGB.go

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package apple2
/*
Extended 80-Column Text AppleColor Card or Video7 RGB-SL7 card
See:
https://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Interface%20Cards/Apple%20IIe/Apple%20IIe%20Extended%2080%20Column%20RGB%20Card/Manuals/Apple%20Ext80ColumnAppleColorCardHR%20Manual.pdf
https://apple2online.com/web_documents/Video-7%20Manual%20KB.pdf
https://mirrors.apple2.org.za/ftp.apple.asimov.net/documentation/hardware/video/DIGICARD%2064K%20Extended%2080%20Column%20RGB%20Card%20for%20Apple%20IIe%20Instruction%20Manual.pdf
Diagnostics disk:
https://mirrors.apple2.org.za/ftp.apple.asimov.net/images/hardware/video/Video-7%20Apple%20II%20RGB%20Demo%20%28Video-7%2C%20Inc.%29%281984%29.dsk
It goes to the 80 column slot.
To set the state it AN3 in graphics mode has to go off-on-off-on. Each pair off-on record the state of 80col:
on step 0, an ANN3OFF moves to step 1
on step 1, an ANN3ON moves to step 2, and the value of 80COL is copied to RGB flag 1
on step 2, an ANN3OFF moves to step 3
on step 3, an ANN3ON moves to step 4, and the value of 80COL is copied to RGB flag 2
Modes by RGB flags 1 and 2:
0-0: 560*192 mono
1-1: 140*192 ntsc
0-1: Mixed mode
1-0: 160*192 ntsc
*/
type cardRGB struct {
// cardBase, not a regular card
step uint8
}
func setupRGBCard(a *Apple2) *cardRGB {
var c cardRGB
c.step = 0
// Does not have ROM or private softswitches. It spies on the softswitches
a.io.addSoftSwitchRW(0x50, func(io *ioC0Page) uint8 {
io.softSwitchesData[ioFlagText] = ssOff
// Reset RGB modes when entering graphics mode
c.step = 0
io.softSwitchesData[ioFlag1RGBCard] = ssOn
io.softSwitchesData[ioFlag2RGBCard] = ssOn
return 0
}, "TEXTOFF")
a.io.addSoftSwitchRW(0x5e, func(io *ioC0Page) uint8 {
io.softSwitchesData[ioFlagAnnunciator3] = ssOff
switch c.step {
case 0:
c.step++
case 2:
c.step++
}
return 0
}, "ANN3OFF-RGB")
a.io.addSoftSwitchRW(0x5f, func(io *ioC0Page) uint8 {
io.softSwitchesData[ioFlagAnnunciator3] = ssOn
switch c.step {
case 1:
io.softSwitchesData[ioFlag1RGBCard] = io.softSwitchesData[ioFlag80Col]
c.step++
case 3:
io.softSwitchesData[ioFlag2RGBCard] = io.softSwitchesData[ioFlag80Col]
c.step++
}
return 0
}, "ANN3ON-RGB")
return &c
}