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Made first attempt at offering some sort of pictographic of actual RAM contents.

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This commit is contained in:
Thomas Harte 2017-08-01 07:34:12 -04:00
parent 3ae699964f
commit 10a5581aea
1 changed files with 21 additions and 3 deletions
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24
Machines/AmstradCPC/AmstradCPC.cpp
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@ -16,7 +16,13 @@ using namespace AmstradCPC;
struct CRTCBusHandler {
public:
CRTCBusHandler() : cycles_(0), was_enabled_(false), was_sync_(false), pixel_data_(nullptr), pixel_pointer_(nullptr) {}
CRTCBusHandler(uint8_t *ram) :
cycles_(0),
was_enabled_(false),
was_sync_(false),
pixel_data_(nullptr),
pixel_pointer_(nullptr),
ram_(ram) {}
inline void perform_bus_cycle(const Motorola::CRTC::BusState &state) {
cycles_++;
@ -28,7 +34,16 @@ struct CRTCBusHandler {
pixel_pointer_ = pixel_data_ = crt_->allocate_write_area(320);
}
if(pixel_pointer_) {
*pixel_pointer_++ = 0xff;
// the CPC shuffles output lines as:
// MA12 MA11 RA2 RA1 RA0 MA9 MA8 MA7 MA6 MA5 MA4 MA3 MA2 MA1 MA0 CCLK
uint16_t address =
(uint16_t)(
((state.refresh_address & 0x3FF) << 1) |
((state.row_address & 7) << 11) |
((state.refresh_address & 0x1800) << 3)
);
*pixel_pointer_++ = ram_[address];
// flush the current buffer if full
if(pixel_pointer_ == pixel_data_ + 320) {
@ -81,6 +96,8 @@ struct CRTCBusHandler {
bool was_enabled_, was_sync_;
std::shared_ptr<Outputs::CRT::CRT> crt_;
uint8_t *pixel_data_, *pixel_pointer_;
uint8_t *ram_;
};
class ConcreteMachine:
@ -89,7 +106,8 @@ class ConcreteMachine:
public:
ConcreteMachine() :
crtc_counter_(HalfCycles(4)), // This starts the CRTC exactly out of phase with the memory accesses
crtc_(crtc_bus_handler_) {
crtc_(crtc_bus_handler_),
crtc_bus_handler_(ram_) {
// primary clock is 4Mhz
set_clock_rate(4000000);
}