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Get as far as MDA being able to fetch.

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This commit is contained in:
Thomas Harte 2023-11-22 13:52:28 -05:00
parent f249e4ada6
commit 381537fde9
1 changed files with 15 additions and 1 deletions
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16
Machines/PCCompatible/PCCompatible.cpp
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@ -39,6 +39,10 @@ class MDA {
public:
MDA() : crtc_(Motorola::CRTC::Personality::HD6845S, outputter_) {}
void set_source(const uint8_t *source) {
outputter_.source = source;
}
void run_for(Cycles cycles) {
// I _think_ the MDA's CRTC is clocked at 14/9ths the PIT clock.
// Do that conversion here.
@ -127,6 +131,8 @@ class MDA {
}
if(pixels) {
// TODO: use refresh address to fetch from RAM; use that plus row address to index font.
pixel_pointer[0] = pixel_pointer[2] = pixel_pointer[4] = pixel_pointer[6] = 0;
pixel_pointer[1] = pixel_pointer[3] = pixel_pointer[5] = pixel_pointer[7] = pixel_pointer[8] = 1;
pixel_pointer += 9;
@ -156,6 +162,8 @@ class MDA {
uint8_t *pixels = nullptr;
uint8_t *pixel_pointer = nullptr;
static constexpr size_t DefaultAllocationSize = 720;
const uint8_t *source = nullptr;
} outputter_;
Motorola::CRTC::CRTC6845<CRTCOutputter> crtc_;
@ -492,12 +500,15 @@ struct Memory {
}
//
// Population.
// External access.
//
void install(size_t address, const uint8_t *data, size_t length) {
std::copy(data, data + length, memory.begin() + std::vector<uint8_t>::difference_type(address));
}
const uint8_t *at(uint32_t address) {
return &memory[address];
}
// TEMPORARY HACK.
// void print_mda() {
@ -764,6 +775,9 @@ class ConcreteMachine:
const auto &bios_contents = roms.find(bios)->second;
context.memory.install(0x10'0000 - bios_contents.size(), bios_contents.data(), bios_contents.size());
// Give the MDA something to read from.
mda_.set_source(context.memory.at(0xb'0000));
}
~ConcreteMachine() {