Merge pull request #12 from penfold42/switchdecode
RAMBOard support - 8k ram @ $8000
This commit is contained in:
Stephen White
GitHub
commit
d970e0ec73
3 changed files with 102 additions and 18 deletions
111
src/main.cpp
111
src/main.cpp
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@ -90,6 +90,7 @@ u8 deviceID = 8;
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IEC_Commands m_IEC_Commands;
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bool onResetChangeToStartingFolder = false;
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bool extraRAM = false;
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bool enableRAMBOard = false;
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bool disableSD2IECCommands = false;
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bool supportUARTInput = false;
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bool graphIEC = false;
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@ -202,20 +203,43 @@ DWORD get_fattime() { return 0; } // If you have hardware RTC return a correct v
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// 1c00 !cs2 on pin 7
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u8 read6502(u16 address)
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{
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u8 value;
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if (address & 0x8000) // address line 15 selects the ROM
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u8 value = 0;
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if (address & 0x8000)
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{
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value = roms.Read(address);
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switch (address & 0xe000) // keep bits 15,14,13
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{
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case 0x8000: // 0x8000-0x9fff
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if (enableRAMBOard) {
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value = s_u8Memory[address]; // 74LS42 outputs low on pin 1 or pin 2
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break;
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}
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case 0xa000: // 0xa000-0xbfff
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case 0xc000: // 0xc000-0xdfff
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case 0xe000: // 0xe000-0xffff
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value = roms.Read(address);
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break;
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}
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}
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else
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{
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// Address lines 15, 12, 11 and 10 are fed into a 74LS42 for decoding
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u16 addressLines15_12_11_10 = (address & 0x1c00) >> 10;
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addressLines15_12_11_10 |= (address & 0x8000) >> (15 - 3);
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if (addressLines15_12_11_10 == 0 || addressLines15_12_11_10 == 1) value = s_u8Memory[address & 0x7ff]; // 74LS42 outputs low on pin 1 or pin 2
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else if (addressLines15_12_11_10 == 6) value = pi1541.VIA[0].Read(address); // 74LS42 outputs low on pin 7
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else if (addressLines15_12_11_10 == 7) value = pi1541.VIA[1].Read(address); // 74LS42 outputs low on pin 9
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else value = address >> 8; // Empty address bus
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u16 addressLines12_11_10 = (address & 0x1c00) >> 10;
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switch (addressLines12_11_10)
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{
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case 0:
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case 1:
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value = s_u8Memory[address & 0x7ff]; // 74LS42 outputs low on pin 1 or pin 2
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break;
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case 6:
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value = pi1541.VIA[0].Read(address); // 74LS42 outputs low on pin 7
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break;
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case 7:
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value = pi1541.VIA[1].Read(address); // 74LS42 outputs low on pin 9
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break;
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default:
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value = address >> 8; // Empty address bus
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break;
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}
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}
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return value;
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}
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@ -258,12 +282,41 @@ u8 peek6502(u16 address)
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void write6502(u16 address, const u8 value)
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{
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if (address & 0x8000) return; // address line 15 selects the ROM
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u16 addressLines15_12_11_10 = (address & 0x1c00) >> 10;
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addressLines15_12_11_10 |= (address & 0x8000) >> (15 - 3);
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if (addressLines15_12_11_10 == 0 || addressLines15_12_11_10 == 1) s_u8Memory[address & 0x7ff] = value; // 74LS42 outputs low on pin 1 or pin 2
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else if (addressLines15_12_11_10 == 6) pi1541.VIA[0].Write(address, value); // 74LS42 outputs low on pin 7
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else if (addressLines15_12_11_10 == 7) pi1541.VIA[1].Write(address, value); // 74LS42 outputs low on pin 9
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if (address & 0x8000)
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{
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switch (address & 0xe000) // keep bits 15,14,13
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{
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case 0x8000: // 0x8000-0x9fff
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if (enableRAMBOard) {
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s_u8Memory[address] = value; // 74LS42 outputs low on pin 1 or pin 2
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break;
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}
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case 0xa000: // 0xa000-0xbfff
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case 0xc000: // 0xc000-0xdfff
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case 0xe000: // 0xe000-0xffff
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return;
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}
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}
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else
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{
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// Address lines 15, 12, 11 and 10 are fed into a 74LS42 for decoding
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u16 addressLines12_11_10 = (address & 0x1c00) >> 10;
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switch (addressLines12_11_10)
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{
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case 0:
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case 1:
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s_u8Memory[address & 0x7ff] = value; // 74LS42 outputs low on pin 1 or pin 2
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break;
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case 6:
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pi1541.VIA[0].Write(address, value); // 74LS42 outputs low on pin 7
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break;
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case 7:
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pi1541.VIA[1].Write(address, value); // 74LS42 outputs low on pin 9
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break;
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default:
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break;
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}
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}
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}
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void write6502ExtraRAM(u16 address, const u8 value)
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@ -963,6 +1016,9 @@ static void CheckOptions()
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extraRAM = options.GetExtraRAM() != 0;
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DEBUG_LOG("extraRAM = %d\r\n", extraRAM);
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enableRAMBOard = options.GetRAMBOard() != 0;
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DEBUG_LOG("RAMBOard = %d\r\n", enableRAMBOard);
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disableSD2IECCommands = options.GetDisableSD2IECCommands();
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//supportUARTInput = options.GetSupportUARTInput() != 0;
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graphIEC = options.GraphIEC();
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@ -978,6 +1034,23 @@ static void CheckOptions()
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invertIECInputs = false;
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ignoreReset = options.IgnoreReset();
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// print confirmation of parsed options
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if (0) {
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screen.Clear(COLOUR_BLACK);
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int y_pos = 200;
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snprintf(tempBuffer, tempBufferSize, "ignoreReset = %d\r\n", ignoreReset);
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screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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snprintf(tempBuffer, tempBufferSize, "RAMBOard = %d\r\n", enableRAMBOard);
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screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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snprintf(tempBuffer, tempBufferSize, "splitIECLines = %d\r\n", splitIECLines);
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screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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snprintf(tempBuffer, tempBufferSize, "invertIECInputs = %d\r\n", invertIECInputs);
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screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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snprintf(tempBuffer, tempBufferSize, "invertIECOutputs = %d\r\n", invertIECOutputs);
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screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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IEC_Bus::WaitMicroSeconds(5 * 1000000);
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}
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ROMName = options.GetRomFontName();
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if (ROMName)
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{
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@ -1077,12 +1150,14 @@ extern "C"
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write32(ARM_GPIO_GPCLR0, 0xFFFFFFFF);
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DisplayLogo();
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int y_pos = 184;
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snprintf(tempBuffer, tempBufferSize, "Copyright(C) 2018 Stephen White");
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screen.PrintText(false, 0, 200, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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snprintf(tempBuffer, tempBufferSize, "This program comes with ABSOLUTELY NO WARRANTY.");
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screen.PrintText(false, 0, 216, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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snprintf(tempBuffer, tempBufferSize, "This is free software, and you are welcome to redistribute it.");
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screen.PrintText(false, 0, 232, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
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if (!quickBoot)
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IEC_Bus::WaitMicroSeconds(3 * 1000000);
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@ -122,6 +122,7 @@ Options::Options(void)
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, deviceID(8)
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, onResetChangeToStartingFolder(0)
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, extraRAM(0)
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, enableRAMBOard(0)
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, disableSD2IECCommands(0)
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, supportUARTInput(0)
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, graphIEC(0)
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@ -174,6 +175,12 @@ void Options::Process(char* buffer)
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if ((nValue = GetDecimal(pValue)) != INVALID_VALUE)
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extraRAM = nValue;
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}
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else if (strcasecmp(pOption, "RAMBOard") == 0)
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{
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unsigned nValue = 0;
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if ((nValue = GetDecimal(pValue)) != INVALID_VALUE)
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enableRAMBOard = nValue;
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}
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else if (strcasecmp(pOption, "DisableSD2IECCommands") == 0)
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{
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unsigned nValue = 0;
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@ -49,6 +49,7 @@ public:
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const char* GetRomFontName() const { return ROMFontName; }
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const char* GetRomName(int index) const;
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unsigned int GetExtraRAM() const { return extraRAM; }
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unsigned int GetRAMBOard() const { return enableRAMBOard; }
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unsigned int GetDisableSD2IECCommands() const { return disableSD2IECCommands; }
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unsigned int GetSupportUARTInput() const { return supportUARTInput; }
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@ -70,6 +71,7 @@ private:
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unsigned int deviceID;
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unsigned int onResetChangeToStartingFolder;
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unsigned int extraRAM;
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unsigned int enableRAMBOard;
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unsigned int disableSD2IECCommands;
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unsigned int supportUARTInput;
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unsigned int graphIEC;
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