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Unify CRTC routing.

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This commit is contained in:
Thomas Harte 2023-12-05 23:00:43 -05:00
parent 84ee683ad3
commit fdd599e71a
1 changed files with 27 additions and 28 deletions
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55
Machines/PCCompatible/PCCompatible.cpp
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@ -605,6 +605,9 @@ class IO {
pit_(pit), dma_(dma), ppi_(ppi), pic_(pic), video_(card), fdc_(fdc) {}
template <typename IntT> void out(uint16_t port, IntT value) {
static constexpr uint16_t crtc_base =
video == VideoAdaptor::MDA ? 0x03b0 : 0x03d0;
switch(port) {
default:
if constexpr (std::is_same_v<IntT, uint8_t>) {
@ -661,39 +664,29 @@ class IO {
case 0x0087: dma_.pages.set_page<7>(uint8_t(value)); break;
//
// MDA block, with slightly laboured 16-bit to 8-bit mapping.
// CRTC access block, with slightly laboured 16-bit to 8-bit mapping.
//
case 0x03b0: case 0x03b2: case 0x03b4: case 0x03b6:
if constexpr (video == VideoAdaptor::MDA) {
if constexpr (std::is_same_v<IntT, uint16_t>) {
video_.template write<0>(uint8_t(value));
video_.template write<1>(uint8_t(value >> 8));
} else {
video_.template write<0>(value);
}
case crtc_base + 0: case crtc_base + 2:
case crtc_base + 4: case crtc_base + 6:
if constexpr (std::is_same_v<IntT, uint16_t>) {
video_.template write<0>(uint8_t(value));
video_.template write<1>(uint8_t(value >> 8));
} else {
video_.template write<0>(value);
}
break;
case 0x03b1: case 0x03b3: case 0x03b5: case 0x03b7:
if constexpr (video == VideoAdaptor::MDA) {
if constexpr (std::is_same_v<IntT, uint16_t>) {
video_.template write<1>(uint8_t(value));
video_.template write<0>(uint8_t(value >> 8));
} else {
video_.template write<1>(value);
}
}
break;
case 0x03b8:
if constexpr (video == VideoAdaptor::MDA) {
video_.template write<8>(uint8_t(value));
case crtc_base + 1: case crtc_base + 3:
case crtc_base + 5: case crtc_base + 7:
if constexpr (std::is_same_v<IntT, uint16_t>) {
video_.template write<1>(uint8_t(value));
video_.template write<0>(uint8_t(value >> 8));
} else {
video_.template write<1>(value);
}
break;
case 0x03d0: case 0x03d1: case 0x03d2: case 0x03d3:
case 0x03d4: case 0x03d5: case 0x03d6: case 0x03d7:
case 0x03d8: case 0x03d9: case 0x03da: case 0x03db:
case 0x03dc: case 0x03dd: case 0x03de: case 0x03df:
// TODO: CGA accesses.
case crtc_base + 8:
video_.template write<8>(uint8_t(value));
break;
case 0x03f2:
@ -781,7 +774,13 @@ class IO {
case 0x03b8:
if constexpr (video == VideoAdaptor::MDA) {
return video_.template read<8>();
return video_.template read<0x8>();
}
break;
case 0x3da:
if constexpr (video == VideoAdaptor::CGA) {
return video_.template read<0xa>();
}
break;