ZX Spectrum from coronavirus and sticks (actually, not really)

• 14 15 , 16 , , 000, 0 ( ), Y0 (15 ). , .
• 14 , 15 — , 16 , 32 , 001, 1 , Y1 (14 ). , 16 , .
• 14 , 15 — , - 32 48 , 010, Y2 (13 ). , .
• If both lines (A14 and A15) are active, the processor accesses the top 16 KiB of memory, from 48 to 64 KiB, we don’t have it, so the Y3 pin (12th pin) is also in the air.

// CPU defines
#define CPU_CLOCK_PIN 2
#define CPU_RESET_PIN 3

// RAM defines
#define RAM_OUTPUT_ENABLE_PIN 4
#define RAM_WRITE_ENABLE_PIN 5
#define RAM_CHIP_ENABLE_PIN 6
#define RAM_BUFFER_PIN 7

// Shift Register defines
#define SR_DATA_PIN 8
#define SR_OUTPUT_ENABLE_PIN 9
#define SR_LATCH_PIN 10
#define SR_CLOCK_PIN 11

//////////////////////////////////////////////////////////////////////////

void setup() {
  // All CPU and RAM control signals need to be configured as inputs by default
  // and only changed to outputs when used.
  // Shift register control signals may be preconfigured

  // CPU controls seetup
  DDRC = B00000000;
  pinMode(CPU_CLOCK_PIN, INPUT);
  pinMode(CPU_RESET_PIN, INPUT);

  // RAM setup
  pinMode(RAM_WRITE_ENABLE_PIN, INPUT);
  pinMode(RAM_OUTPUT_ENABLE_PIN, INPUT);
  pinMode(RAM_CHIP_ENABLE_PIN, INPUT);
  pinMode(RAM_BUFFER_PIN, OUTPUT);
  digitalWrite(RAM_BUFFER_PIN, LOW);

  // SR setup
  pinMode(SR_LATCH_PIN, OUTPUT);
  pinMode(SR_CLOCK_PIN, OUTPUT);
  pinMode(SR_DATA_PIN, OUTPUT);
  pinMode(SR_OUTPUT_ENABLE_PIN, OUTPUT);
  digitalWrite(SR_OUTPUT_ENABLE_PIN, HIGH); // active low

  // common setup
  Serial.begin(9600);
  Serial.println("Hello");
}// setup

//////////////////////////////////////////////////////////////////////////

void shiftReadValueFromAddress(uint16_t address, uint8_t *value) {
  // disable RAM output
  pinMode(RAM_WRITE_ENABLE_PIN, OUTPUT);
  digitalWrite(RAM_WRITE_ENABLE_PIN, HIGH); // active low
  pinMode(RAM_OUTPUT_ENABLE_PIN, OUTPUT);
  digitalWrite(RAM_OUTPUT_ENABLE_PIN, HIGH); // active low
  // set address
  digitalWrite(SR_LATCH_PIN, LOW);
  shiftOut(SR_DATA_PIN, SR_CLOCK_PIN, MSBFIRST, address>>8); 
  shiftOut(SR_DATA_PIN, SR_CLOCK_PIN, MSBFIRST, address);  
  digitalWrite(SR_LATCH_PIN, HIGH);
  digitalWrite(SR_OUTPUT_ENABLE_PIN, LOW); // active low
  // write value to RAM
  digitalWrite(RAM_OUTPUT_ENABLE_PIN, LOW); // active low
  delay(1);
  DDRC = B00000000;
  *value = PINC;
  digitalWrite(RAM_OUTPUT_ENABLE_PIN, HIGH); // active low
  // disable SR
  digitalWrite(SR_OUTPUT_ENABLE_PIN, HIGH); // active low
  pinMode(RAM_WRITE_ENABLE_PIN, INPUT);
  pinMode(RAM_OUTPUT_ENABLE_PIN, INPUT);
}// shiftWriteValueToAddress

//////////////////////////////////////////////////////////////////////////

void runClock(uint32_t cycles) {
  uint32_t currCycle = 0;
  pinMode(CPU_CLOCK_PIN, OUTPUT);
  while(currCycle < cycles) {
    digitalWrite(CPU_CLOCK_PIN, HIGH);
    digitalWrite(CPU_CLOCK_PIN, LOW);
    currCycle++;
  }
  pinMode(CPU_CLOCK_PIN, INPUT);
}// runClock

//////////////////////////////////////////////////////////////////////////

void trySpectrum() {
  pinMode(RAM_WRITE_ENABLE_PIN, INPUT);
  pinMode(RAM_OUTPUT_ENABLE_PIN, INPUT);
  pinMode(CPU_RESET_PIN, OUTPUT);
  digitalWrite(CPU_RESET_PIN, LOW);
  runClock(30);
  digitalWrite(CPU_RESET_PIN, HIGH);
  runClock(12500000);
}// trySpectrum

//////////////////////////////////////////////////////////////////////////

void readDisplayLines() {
  uint8_t value;
  digitalWrite(RAM_BUFFER_PIN, HIGH);
  pinMode(RAM_CHIP_ENABLE_PIN, OUTPUT);
  digitalWrite(RAM_CHIP_ENABLE_PIN, LOW);
  for(uint16_t i=16384; i<16384+6144;i++) {
    shiftReadValueFromAddress(i, &value);
    Serial.println(value);
  }
  pinMode(RAM_CHIP_ENABLE_PIN, INPUT);
}// readDisplayLines

//////////////////////////////////////////////////////////////////////////

void loop() {
  trySpectrum();
  Serial.println("Hope we are ok now. Please set up memory for reading");
  delay(40000);
  Serial.println("Reading memory");
  readDisplayLines();
  Serial.println("Done");
  delay(100000);
}// loop

// CPU defines
#define CPU_CLOCK_PIN 2 -  2     6  ( )
#define CPU_RESET_PIN 3 -  3     26  (RESET)

// RAM defines
#define RAM_OUTPUT_ENABLE_PIN 4 -  4     22  (OE)
#define RAM_WRITE_ENABLE_PIN 5 -  5    .     .
#define RAM_CHIP_ENABLE_PIN 6 -  6     .        ,        .   - ,   -  .   ,   .
#define RAM_BUFFER_PIN 7 -  ,    6,    .

// Shift Register defines
#define SR_DATA_PIN 8   -  8     14 "" 595.        9 ,     .
#define SR_OUTPUT_ENABLE_PIN 9 -   13  595
#define SR_LATCH_PIN 10 -   12  595
#define SR_CLOCK_PIN 11 -   11  595.

#include "stdafx.h"
#include <windows.h>
#include <stdint.h>
#include <stdio.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
uint8_t *scrData;

VOID OnPaint(HDC hdc) {
	size_t arrSize = 6144;//sizeof(scrData) / sizeof(scrData[0]);
	//int currRow = 0, currX = 0, currBlock = 0, currY = 0, currBase = 0;
	for (size_t arrPos = 0; arrPos < arrSize; arrPos++) {
		int blockPos = arrPos % 2048;
		int currBase = (blockPos % 256) / 32;
		int currX = blockPos % 32;
		int currBlock = arrPos / 2048;
		int currRow = blockPos / 256;
		int currY = currBlock * 64 + currBase * 8 + currRow;
		for (int trueX = 0; trueX < 8; trueX++) {
			char r = ((scrData[arrPos] >> trueX) & 1)*255;
			SetPixel(hdc, currX * 8 + (8-trueX), currY, RGB(r, r, r));
		}
	}
}

void loadData() {
	FILE *file;
	errno_t err;
	if ((err = fopen_s(&file, "data.txt", "r"))) {
		MessageBox(NULL, L"Unable to oopen the file", L"Error", 1);
	}
	scrData = (uint8_t*)malloc(6144);
	int currDataPos = 0;
	char buffer[256];
	char currChar = 0;
	int currLinePos = 0;
	while (currChar != EOF) {
		currChar = getc(file);
		buffer[currLinePos++] = currChar;
		if (currChar == '\n') {
			buffer[currLinePos] = 0;
			scrData[currDataPos++] = (uint8_t)atoi(buffer);
			currLinePos = 0;
		}
	}
	fclose(file);
}

INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PSTR, INT iCmdShow) {
	HWND                hWnd;
	MSG                 msg;
	WNDCLASS            wndClass;
	wndClass.style = CS_HREDRAW | CS_VREDRAW;
	wndClass.lpfnWndProc = WndProc;
	wndClass.cbClsExtra = 0;
	wndClass.cbWndExtra = 0;
	wndClass.hInstance = hInstance;
	wndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
	wndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wndClass.lpszMenuName = NULL;
	wndClass.lpszClassName = TEXT("GettingStarted");
	RegisterClass(&wndClass);
	hWnd = CreateWindow(
		TEXT("GettingStarted"),   // window class name
		TEXT("Getting Started"),  // window caption
		WS_OVERLAPPEDWINDOW,      // window style
		CW_USEDEFAULT,            // initial x position
		CW_USEDEFAULT,            // initial y position
		CW_USEDEFAULT,            // initial x size
		CW_USEDEFAULT,            // initial y size
		NULL,                     // parent window handle
		NULL,                     // window menu handle
		hInstance,                // program instance handle
		NULL);                    // creation parameters
	loadData();
	ShowWindow(hWnd, iCmdShow);
	UpdateWindow(hWnd);
	while (GetMessage(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
}  // WinMain

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
	HDC          hdc;
	PAINTSTRUCT  ps;
	switch (message) {
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		OnPaint(hdc);
		EndPaint(hWnd, &ps);
		return 0;
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
} // WndProc