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https://github.com/bradgrantham/apple2e.git
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initial floating bus implementation
This commit is contained in:
Brad Grantham
parent
bdcf50f890
commit
9d5d4b4a35
229
apple2e.cpp
229
apple2e.cpp
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@ -463,6 +463,32 @@ struct DISKIIboard : board_base
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virtual void reset(void) {}
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};
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struct Mockingboard : board_base
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{
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Mockingboard()
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{
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}
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virtual bool write(int addr, unsigned char data)
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{
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if((addr >= 0xC400) && (addr <= 0xC4FF)) {
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if(debug & DEBUG_RW) printf("Mockingboard write 0x%02X to 0x%04X ignored\n", data, addr);
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return true;
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}
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return false;
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}
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virtual bool read(int addr, unsigned char &data)
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{
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if((addr >= 0xC400) && (addr <= 0xC4FF)) {
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if(debug & DEBUG_RW) printf("Mockingboard read at 0x%04X ignored\n", addr);
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data = 0;
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return true;
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}
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return false;
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}
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virtual void reset(void) {}
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};
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const int waveform_length = 44100 / 1000 / 2; // half of a wave at 4000 Hz
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const float waveform_max_amplitude = .35f;
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static unsigned char waveform[waveform_length];
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@ -477,6 +503,114 @@ void initialize_audio_waveform()
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}
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}
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int hires_blanking_address_base[262];
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extern int hires_visible_address_base[262];
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static void generate_hires_scanout_addresses() __attribute__((constructor));
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void generate_hires_scanout_addresses()
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{
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for(int i = 0; i < 262; i++)
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if(i < 64)
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hires_blanking_address_base[i] = hires_visible_address_base[i] + 0x68;
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else
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hires_blanking_address_base[i] = hires_visible_address_base[i] - 0x18;
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}
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int get_hires_scanout_address(int byte_in_frame)
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{
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int line_in_frame = byte_in_frame / 65;
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int byte_in_line = byte_in_frame % 65;
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if(byte_in_line < 25)
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return hires_blanking_address_base[line_in_frame] + byte_in_line;
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return hires_visible_address_base[line_in_frame] + byte_in_line - 25;
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}
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static int text_blanking_address_base[] =
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{
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0x1468,
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0x14E8,
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0x1568,
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0x15E8,
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0x1668,
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0x16E8,
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0x1768,
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0x17E8,
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0x1410,
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0x1490,
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0x1510,
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0x1590,
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0x1610,
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0x1690,
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0x1710,
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0x1790,
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0x1438,
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0x14B8,
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0x1538,
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0x15B8,
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0x1638,
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0x16B8,
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0x1738,
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0x17B8,
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0x1460,
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0x14E0,
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0x1560,
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0x15E0,
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0x1660,
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0x16E0,
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0x1760,
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0x17E0,
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0x17E0, // last text line is actually scanned 14 times so add another row
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};
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static int text_visible_address_base[] =
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{
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0x0400,
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0x0480,
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0x0500,
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0x0580,
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0x0600,
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0x0680,
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0x0700,
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0x0780,
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0x0428,
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0x04A8,
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0x0528,
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0x05A8,
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0x0628,
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0x06A8,
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0x0728,
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0x07A8,
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0x0450,
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0x04D0,
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0x0550,
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0x05D0,
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0x0650,
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0x06D0,
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0x0750,
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0x07D0,
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0x0478,
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0x04F8,
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0x0578,
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0x05F8,
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0x0678,
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0x06F8,
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0x0778,
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0x07F8,
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0x07F8, // last text line is actually scanned 14 times so add another row
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};
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int get_text_scanout_address(int byte_in_frame)
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{
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int text_line_in_frame = byte_in_frame / (8 * 65);
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int byte_in_line = byte_in_frame % 65;
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if(byte_in_line < 25)
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return text_blanking_address_base[text_line_in_frame] + byte_in_line;
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return text_visible_address_base[text_line_in_frame] + byte_in_line - 25;
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}
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struct MAINboard : board_base
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{
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system_clock& clk;
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@ -681,6 +815,58 @@ struct MAINboard : board_base
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virtual bool read(int addr, unsigned char &data)
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{
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// Special case for floating bus for reading video scanout
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// XXX doesn't handle 80-column nor AUX
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if((addr == 0xC050) || (addr == 0xC051)) {
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bool page1 = (PAGE2 && !STORE80) ? false : true;
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// 65 bytes per line, 262 lines per frame (aka "field")
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int byte_in_frame = clk.clock_cpu % 17030;
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int line_in_frame = byte_in_frame / 65;
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if(1)printf("TEXT %s, HIRES %s, MIXED %s, line_in_frame = %d\n",
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TEXT ? "true" : "false",
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HIRES ? "true" : "false",
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MIXED ? "true" : "false",
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line_in_frame);
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bool mixed_text_scanout =
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((line_in_frame >= 160) && (line_in_frame < 192)) ||
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(line_in_frame >= 224);
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if(TEXT || !HIRES || (MIXED && mixed_text_scanout)) {
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// TEXT or GR mode; they read the same addresses.
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int addr2 = get_text_scanout_address(byte_in_frame) + (page1 ? 0 : 0x0400);
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printf("got text scanout address $%04X\n", addr2);
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if(addr2 > 0xC00) {
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printf("read 0C00 floating bus\n");
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ram_0C00.read(addr2, data);
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} else {
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if(page1) {
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printf("read text page1 floating bus\n");
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text_page1.read(addr2, data);
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return true;
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} else {
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printf("read text page2 floating bus\n");
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text_page2.read(addr2, data);
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return true;
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}
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}
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} else {
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// HGR mode and not in text region if MIXED
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int addr2 = get_hires_scanout_address(byte_in_frame) + (page1 ? 0 : 0x2000);
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printf("got hires scanout address $%04X\n", addr2);
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if(page1) {
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printf("read hires page1 floating bus\n");
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hires_page1.read(addr2, data);
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return true;
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} else {
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printf("read hires page2 floating bus\n");
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hires_page2.read(addr2, data);
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return true;
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}
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}
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}
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if(debug & DEBUG_RW) printf("MAIN board read\n");
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for(auto b : boards) {
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if(b->read(addr, data)) {
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@ -2559,6 +2745,7 @@ map<int, key_to_ascii> interface_key_to_apple2e =
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};
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DISKIIboard *diskIIboard;
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Mockingboard *mockingboard;
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enum APPLE2Einterface::EventType process_events(MAINboard *board, bus_frontend& bus, CPU6502& cpu)
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{
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@ -2759,6 +2946,8 @@ int main(int argc, char **argv)
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DISKIIboard::floppy_activity_func activity = [](int num, bool activity){APPLE2Einterface::show_floppy_activity(num, activity);};
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diskIIboard = new DISKIIboard(diskII_rom, floppy1_name, floppy2_name, activity);
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mainboard->boards.push_back(diskIIboard);
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mockingboard = new Mockingboard();
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mainboard->boards.push_back(mockingboard);
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} catch(const char *msg) {
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cerr << msg << endl;
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exit(EXIT_FAILURE);
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@ -2883,3 +3072,43 @@ int main(int argc, char **argv)
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APPLE2Einterface::shutdown();
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}
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int hires_visible_address_base[262] =
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{
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0x0000, 0x0400, 0x0800, 0x0C00, 0x1000, 0x1400, 0x1800, 0x1C00,
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0x0080, 0x0480, 0x0880, 0x0C80, 0x1080, 0x1480, 0x1880, 0x1C80,
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0x0100, 0x0500, 0x0900, 0x0D00, 0x1100, 0x1500, 0x1900, 0x1D00,
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0x0180, 0x0580, 0x0980, 0x0D80, 0x1180, 0x1580, 0x1980, 0x1D80,
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0x0200, 0x0600, 0x0A00, 0x0E00, 0x1200, 0x1600, 0x1A00, 0x1E00,
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0x0280, 0x0680, 0x0A80, 0x0E80, 0x1280, 0x1680, 0x1A80, 0x1E80,
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0x0300, 0x0700, 0x0B00, 0x0F00, 0x1300, 0x1700, 0x1B00, 0x1F00,
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0x0380, 0x0780, 0x0B80, 0x0F80, 0x1380, 0x1780, 0x1B80, 0x1F80,
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0x0028, 0x0428, 0x0828, 0x0C28, 0x1028, 0x1428, 0x1828, 0x1C28,
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0x00A8, 0x04A8, 0x08A8, 0x0CA8, 0x10A8, 0x14A8, 0x18A8, 0x1CA8,
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0x0128, 0x0528, 0x0928, 0x0D28, 0x1128, 0x1528, 0x1928, 0x1D28,
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0x01A8, 0x05A8, 0x09A8, 0x0DA8, 0x11A8, 0x15A8, 0x19A8, 0x1DA8,
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0x0228, 0x0628, 0x0A28, 0x0E28, 0x1228, 0x1628, 0x1A28, 0x1E28,
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0x02A8, 0x06A8, 0x0AA8, 0x0EA8, 0x12A8, 0x16A8, 0x1AA8, 0x1EA8,
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0x0328, 0x0728, 0x0B28, 0x0F28, 0x1328, 0x1728, 0x1B28, 0x1F28,
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0x03A8, 0x07A8, 0x0BA8, 0x0FA8, 0x13A8, 0x17A8, 0x1BA8, 0x1FA8,
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0x0050, 0x0450, 0x0850, 0x0C50, 0x1050, 0x1450, 0x1850, 0x1C50,
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0x00D0, 0x04D0, 0x08D0, 0x0CD0, 0x10D0, 0x14D0, 0x18D0, 0x1CD0,
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0x0150, 0x0550, 0x0950, 0x0D50, 0x1150, 0x1550, 0x1950, 0x1D50,
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0x01D0, 0x05D0, 0x09D0, 0x0DD0, 0x11D0, 0x15D0, 0x19D0, 0x1DD0,
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0x0250, 0x0650, 0x0A50, 0x0E50, 0x1250, 0x1650, 0x1A50, 0x1E50,
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0x02D0, 0x06D0, 0x0AD0, 0x0ED0, 0x12D0, 0x16D0, 0x1AD0, 0x1ED0,
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0x0350, 0x0750, 0x0B50, 0x0F50, 0x1350, 0x1750, 0x1B50, 0x1F50,
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0x03D0, 0x07D0, 0x0BD0, 0x0FD0, 0x13D0, 0x17D0, 0x1BD0, 0x1FD0,
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0x0078, 0x0478, 0x0878, 0x0C78, 0x1078, 0x1478, 0x1878, 0x1C78,
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0x00F8, 0x04F8, 0x08F8, 0x0CF8, 0x10F8, 0x14F8, 0x18F8, 0x1CF8,
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0x0178, 0x0578, 0x0978, 0x0D78, 0x1178, 0x1578, 0x1978, 0x1D78,
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0x01F8, 0x05F8, 0x09F8, 0x0DF8, 0x11F8, 0x15F8, 0x19F8, 0x1DF8,
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0x0278, 0x0678, 0x0A78, 0x0E78, 0x1278, 0x1678, 0x1A78, 0x1E78,
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0x02F8, 0x06F8, 0x0AF8, 0x0EF8, 0x12F8, 0x16F8, 0x1AF8, 0x1EF8,
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0x0378, 0x0778, 0x0B78, 0x0F78, 0x1378, 0x1778, 0x1B78, 0x1F78,
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0x03F8, 0x07F8, 0x0BF8, 0x0FF8, 0x13F8, 0x17F8, 0x1BF8, 0x1FF8,
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0x0BF8, 0x0FF8, 0x13F8, 0x17F8, 0x1BF8, 0x1FF8,
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};
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@ -2112,7 +2112,7 @@ int text_row_base_offsets[24] =
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0x3D0,
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};
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int hires_row_base_offsets[192] =
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static int hires_row_base_offsets[192] =
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{
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0x0000, 0x0400, 0x0800, 0x0C00, 0x1000, 0x1400, 0x1800, 0x1C00,
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0x0080, 0x0480, 0x0880, 0x0C80, 0x1080, 0x1480, 0x1880, 0x1C80,
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5
notes
5
notes
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@ -33,8 +33,13 @@ per-scanline modes
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incrementing CPU instruction cycles
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OK - call add_cpu_cycles()
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address generator
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every line is 65 bytes, there are 262 lines, so there are 17030 bytes per field
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honor softswitches
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convert clock_cpu to address
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blanking and offscreen addressing during HIRES MIXED
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160 through 191 and 224 through 261
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TEXT addressing at 160, HPE' + 1 through at 192, HPE'
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argh
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read empty memory address on bus no longer fails but instead
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generate address, get byte from RAM and return it
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recording softswitch mode changes
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