PIC ICW1

2013-03-23 00:12:08 -04:00 · 2013-03-23 00:12:08 -04:00 · 1b7be5151d
commit 1b7be5151d
parent c9023f6453
1 changed files with 10 additions and 0 deletions
--- a/PIC.js
+++ b/PIC.js
@ -72,6 +72,16 @@ PIC.prototype.ioport_write = function(mem8_loc, x) {
    mem8_loc &= 1;
    if (mem8_loc == 0) {
        if (x & 0x10) {
+	    /*
+	      ICW1
+	      // 7:5 = address (if MCS-80/85 mode)
+	      // 4 == 1
+	      // 3: 1 == level triggered, 0 == edge triggered
+	      // 2: 1 == call interval 4, 0 == call interval 8
+	      // 1: 1 == single PIC, 0 == cascaded PICs
+	      // 0: 1 == send ICW4
+
+	     */
            this.reset();
            this.init_state = 1;
            this.init4 = x & 1;