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Brad Grantham
parent
f50ef091a5
commit
f9dbf8a704
142
apple2e.cpp
142
apple2e.cpp
@ -62,7 +62,7 @@ const int textport_row_base_addresses[] =
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0x750,
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0x7D0,
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};
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void textport_change(unsigned char *port)
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void textport_change(unsigned char *textport)
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{
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printf("TEXTPORT:\n");
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printf("------------------------------------------\n");
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@ -70,7 +70,8 @@ void textport_change(unsigned char *port)
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printf("|");
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for(int col = 0; col < 40; col++) {
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int addr = textport_row_base_addresses[row] + col;
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printf("%c", isprint(port[addr]) ? port[addr] : ' ');
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int ch = textport[addr] & 0x7F;
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printf("%c", isprint(ch) ? ch : '?');
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}
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printf("|\n");
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}
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@ -119,38 +120,38 @@ struct MAINboard : board_base
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SoftSwitch* sw = *it;
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if(addr == sw->read_address) {
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data = sw->sw ? 0x80 : 0x00;
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printf("Read status of %s = %02X\n", sw->name.c_str(), data);
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if(debug & DEBUG_RW) printf("Read status of %s = %02X\n", sw->name.c_str(), data);
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return true;
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} else if(sw->read_also_changes && addr == sw->set_address) {
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data = 0xff;
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sw->sw = true;
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printf("Set %s\n", sw->name.c_str());
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if(debug & DEBUG_RW) printf("Set %s\n", sw->name.c_str());
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return true;
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} else if(sw->read_also_changes && addr == sw->clear_address) {
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data = 0xff;
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sw->sw = false;
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printf("Clear %s\n", sw->name.c_str());
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if(debug & DEBUG_RW) printf("Clear %s\n", sw->name.c_str());
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return true;
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}
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}
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if(ignore_mmio.find(addr) != ignore_mmio.end()) {
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printf("read %04X, ignored, return 0x00\n", addr);
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if(debug & DEBUG_RW) printf("read %04X, ignored, return 0x00\n", addr);
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data = 0x00;
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return true;
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}
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if(addr == 0xC000) {
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printf("read KBD, force 0x00\n");
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if(debug & DEBUG_RW) printf("read KBD, force 0x00\n");
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data = 0x00;
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return true;
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}
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if(addr == 0xC030) {
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printf("read SPKR, force 0x00\n");
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if(debug & DEBUG_RW) printf("read SPKR, force 0x00\n");
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// click
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data = 0x00;
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return true;
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}
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if(addr == 0xC010) {
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printf("read KBDSTRB, force 0x00\n");
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if(debug & DEBUG_RW) printf("read KBDSTRB, force 0x00\n");
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// reset keyboard latch
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data = 0x00;
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return true;
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@ -191,22 +192,22 @@ struct MAINboard : board_base
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if(addr == sw->set_address) {
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data = 0xff;
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sw->sw = true;
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printf("Set %s\n", sw->name.c_str());
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if(debug & DEBUG_RW) printf("Set %s\n", sw->name.c_str());
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return true;
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} else if(addr == sw->clear_address) {
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data = 0xff;
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sw->sw = false;
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printf("Clear %s\n", sw->name.c_str());
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if(debug & DEBUG_RW) printf("Clear %s\n", sw->name.c_str());
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return true;
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}
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}
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if(addr == 0xC010) {
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printf("write KBDSTRB\n");
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if(debug & DEBUG_RW) printf("write KBDSTRB\n");
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// reset keyboard latch
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return true;
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}
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if(addr == 0xC030) {
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printf("write SPKR\n");
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if(debug & DEBUG_RW) printf("write SPKR\n");
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// click
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return true;
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}
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@ -363,6 +364,22 @@ struct CPU6502
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unsigned char inst = read_pc_inc(bus);
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switch(inst) {
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case 0xCA: {
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if(debug & DEBUG_DECODE) printf("DEC X\n");
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x = x - 1;
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flag_change(Z, x == 0x00);
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flag_change(N, x & 0x80);
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break;
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}
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case 0xC8: {
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if(debug & DEBUG_DECODE) printf("INC Y\n");
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y = y + 1;
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flag_change(Z, y == 0x00);
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flag_change(N, y & 0x80);
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break;
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}
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case 0xEA: {
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if(debug & DEBUG_DECODE) printf("NOP\n");
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break;
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@ -430,9 +447,19 @@ struct CPU6502
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break;
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}
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case 0xC6: {
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int zpg = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("DEC %04X\n", zpg);
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unsigned char m = bus.read(zpg) - 1;
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flag_change(Z, m == 0);
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flag_change(N, m & 0x80);
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bus.write(zpg, m);
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break;
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}
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case 0xCE: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("DEC %02X\n", addr);
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if(debug & DEBUG_DECODE) printf("DEC %04X\n", addr);
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unsigned char m = bus.read(addr) - 1;
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flag_change(Z, m == 0);
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flag_change(N, m & 0x80);
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@ -456,6 +483,16 @@ struct CPU6502
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break;
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}
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case 0xB1: {
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unsigned char zpg = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("LDA (%02x), Y\n", zpg);
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int addr = bus.read(zpg) + bus.read(zpg + 1) * 256 + y;
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a = bus.read(addr);
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flag_change(Z, a == 0x00);
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flag_change(N, a & 0x80);
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break;
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}
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case 0xA5: {
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unsigned char zpg = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("LDA %02X\n", zpg);
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@ -474,6 +511,15 @@ struct CPU6502
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break;
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}
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case 0xBD: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("LDA %04X, X\n", addr);
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a = bus.read(addr + x);
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flag_change(Z, a == 0x00);
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flag_change(N, a & 0x80);
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break;
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}
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case 0x65: {
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unsigned char zpg = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("ADC %02X\n", zpg);
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@ -609,6 +655,28 @@ struct CPU6502
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break;
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}
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case 0x9D: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("STA %04x, X\n", addr);
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bus.write(addr + x, a);
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break;
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}
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case 0x99: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("STA %04x, Y\n", addr);
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bus.write(addr + y, a);
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break;
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}
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case 0x91: {
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unsigned char zpg = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("STA (%02x), Y\n", zpg);
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int addr = bus.read(zpg) + bus.read(zpg + 1) * 256 + y;
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bus.write(addr, a);
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break;
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}
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case 0x8D: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("STA %04X\n", addr);
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@ -711,6 +779,28 @@ struct CPU6502
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break;
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}
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case 0xC5: {
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unsigned char zpg = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("CMP %04X\n", zpg);
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unsigned char m = bus.read(zpg);
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flag_change(C, m <= a);
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m = a - m;
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flag_change(N, m & 0x80);
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flag_change(Z, m == 0);
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break;
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}
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case 0xCD: {
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int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
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if(debug & DEBUG_DECODE) printf("CMP %04X\n", addr);
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unsigned char m = bus.read(addr);
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flag_change(C, m <= a);
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m = a - m;
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flag_change(N, m & 0x80);
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flag_change(Z, m == 0);
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break;
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}
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case 0xC9: {
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unsigned char imm = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("CMP #%02X\n", imm);
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@ -731,6 +821,17 @@ struct CPU6502
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flag_change(Z, m == 0);
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break;
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}
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case 0xC4: {
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unsigned char zpg = read_pc_inc(bus) + x;
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if(debug & DEBUG_DECODE) printf("CPY %02X\n", zpg);
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unsigned char m = bus.read(zpg);
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flag_change(C, m <= y);
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m = y - m;
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flag_change(N, m & 0x80);
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flag_change(Z, m == 0);
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break;
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}
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case 0x90: {
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int rel = (read_pc_inc(bus) + 128) % 256 - 128;
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@ -793,6 +894,13 @@ struct CPU6502
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break;
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}
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case 0x86: {
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unsigned char zpg = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("STX %02X\n", zpg);
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bus.write(zpg, x);
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break;
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}
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case 0x84: {
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unsigned char zpg = read_pc_inc(bus);
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if(debug & DEBUG_DECODE) printf("STY %02X\n", zpg);
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@ -899,8 +1007,8 @@ int main(int argc, char **argv)
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while(1) {
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cpu.cycle(bus);
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printf("> ");
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char line[512];
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fgets(line, sizeof(line) - 1, stdin);
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// printf("> ");
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// char line[512];
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// fgets(line, sizeof(line) - 1, stdin);
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}
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}
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