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https://github.com/mist64/perfect6502.git
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breaking transistors
This commit is contained in:
Michael Steil
parent
a0034447c1
commit
e292c84c3a
112
perfect6502.c
112
perfect6502.c
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@ -20,9 +20,10 @@
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THE SOFTWARE.
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*/
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int verbose = 0;
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int verbose = 1;
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//#define TEST
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//#define BROKEN_TRANSISTORS
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/************************************************************
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*
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@ -461,6 +462,10 @@ floatnode(nodenum_t nn)
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set_nodes_state_floating(nn, 1);
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}
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#ifdef BROKEN_TRANSISTORS
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transnum_t broken_transistor = (transnum_t)-1;
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#endif
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void
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toggleTransistor(transnum_t tn)
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{
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@ -471,6 +476,13 @@ toggleTransistor(transnum_t tn)
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BOOL on = !get_transistors_on(tn);
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#endif
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#ifdef BROKEN_TRANSISTORS
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if (tn == broken_transistor) {
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if (!on)
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return;
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}
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#endif
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set_transistors_on(tn, on);
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/* if the transistor is off, both nodes are floating */
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@ -926,6 +938,8 @@ step()
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*
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************************************************************/
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count_t transistors;
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void
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setupNodesAndTransistors()
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{
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@ -944,6 +958,7 @@ setupNodesAndTransistors()
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nodenum_t c2 = transdefs[i].c2;
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/* skip duplicate transistors */
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BOOL found = NO;
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#ifndef BROKEN_TRANSISTORS
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for (count_t k = 0; k < i; k++) {
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if (transdefs[k].gate == gate &&
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transdefs[k].c1 == c1 &&
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@ -952,6 +967,7 @@ setupNodesAndTransistors()
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break;
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}
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}
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#endif
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if (!found) {
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transistors_gate[j] = gate;
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transistors_c1[j] = c1;
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@ -959,7 +975,7 @@ setupNodesAndTransistors()
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j++;
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}
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}
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count_t transistors = j;
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transistors = j;
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if (verbose)
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printf("unique transistors: %d\n", transistors);
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@ -1004,7 +1020,7 @@ initChip()
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/* hold RESET for 8 cycles */
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for (int i = 0; i < 16; i++)
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step_quiet();
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step();
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/* release RESET */
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setHigh(res);
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@ -1023,24 +1039,7 @@ initChip()
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*
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************************************************************/
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#ifndef TEST
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int
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main()
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{
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/* set up data structures for efficient emulation */
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setupNodesAndTransistors();
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/* set up memory for user program */
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init_monitor();
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/* set initial state of nodes, transistors, inputs; RESET chip */
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initChip();
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/* emulate the 6502! */
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for (;;) {
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step();
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if (verbose)
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chipStatus();
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};
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}
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#else
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#ifdef TEST
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#define BRK_LENGTH 2 /* BRK pushes PC + 2 onto the stack */
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@ -1590,4 +1589,75 @@ main()
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}
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}
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}
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#elif defined(BROKEN_TRANSISTORS)
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#define MAX_CYCLES 33000
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BOOL log_rw[MAX_CYCLES];
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uint16_t log_ab[MAX_CYCLES];
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uint8_t log_db[MAX_CYCLES];
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int
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main()
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{
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setupNodesAndTransistors();
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for (int run = -1; run < transistors; run ++) {
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#if 0
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/* skip a few runs! */
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if (run == 0)
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run = 180;
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#endif
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if (run != -1) {
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printf("testing transistor %d: ", run);
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broken_transistor = run;
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}
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bzero(memory, 65536);
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init_monitor();
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initChip();
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BOOL fail = NO;
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for (int c = 0; c < MAX_CYCLES; c++) {
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step();
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if (run == -1) {
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log_rw[c] = isNodeHigh(rw);
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log_ab[c] = readAddressBus();
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log_db[c] = readDataBus();
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} else {
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if (log_rw[c] != isNodeHigh(rw)) {
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printf("FAIL, RW %d instead of %d @ %d\n", isNodeHigh(rw), log_rw[c], c);
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fail = YES;
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break;
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}
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if (log_ab[c] != readAddressBus()) {
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printf("FAIL, AB 0x%04x instead of 0x%04x @ %d\n", readAddressBus(), log_ab[c], c);
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fail = YES;
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break;
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}
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if (log_db[c] != readDataBus()) {
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printf("FAIL, DB 0x%02x instead of 0x%02x @ %d\n", readDataBus(), log_db[c], c);
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fail = YES;
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break;
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}
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}
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}
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if (run != -1 && !fail)
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printf("PASS\n");
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}
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}
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#else
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int
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main()
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{
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/* set up data structures for efficient emulation */
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setupNodesAndTransistors();
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/* set up memory for user program */
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init_monitor();
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/* set initial state of nodes, transistors, inputs; RESET chip */
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initChip();
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/* emulate the 6502! */
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for (;;) {
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step();
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if (verbose)
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chipStatus();
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};
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}
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#endif
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@ -399,6 +399,7 @@ CHRIN() {
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/* CHROUT */
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static void
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CHROUT() {
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return;
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//exit(1);
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#if 0
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int a = *(unsigned short*)(&RAM[0x0100+S+1]) + 1;
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@ -913,7 +914,11 @@ kernal_dispatch() {
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case MAGIC_CONTINUATION: /*printf("--CONTINUATION--\n");*/ return 0;
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#if 0
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default: printf("unknown PC=$%04X S=$%02X\n", PC, S); exit(1);
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#else
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default: return 1;
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#endif
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}
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return 1;
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}
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