fixup link to visual6502 wiki

Added zoom using the mouse wheel

README

@@ -1,4 +1,4 @@
-This is the JavaScript simulator from the visual5602.org project:
+This is the JavaScript simulator from the visual6502.org project:
 www.visual6502.org/JSSim
 
 It includes a general purpose transistor-level simulator, layout browser,

chip-6800/support.js

@@ -4,7 +4,9 @@
 
 chipname='6800';
 
-grChipSize=7000;
+grChipSize=6600;
+grChipOffsetX=25
+grChipOffsetY=-200;
 
 ngnd = nodenames['gnd'];
 npwr = nodenames['vcc'];

chip-z80/nodenames.js

@@ -0,0 +1,530 @@
+// ***********************************************************
+// * This file is automatically generated by Z80Simulator.   *
+// * Please do not manually edit! Instead, find a transistor *
+// * that uses the new signal and use FindTransistor(x,y) in *
+// * Z80Simulator to cause that signal to be added.          *
+// * This seems a pain, but it has two advantages:           *
+// * - all signals are then available in Z80Simulator        *
+// * - it avoids renumbering issues if/when the PNGs change  *
+// ***********************************************************
+var nodenames ={
+// Pads
+vss: 1,
+vcc: 2,
+clk: 3,
+ab0: 5,
+ab1: 6,
+ab2: 7,
+ab3: 8,
+ab4: 9,
+ab5: 10,
+ab6: 11,
+ab7: 12,
+ab8: 13,
+ab9: 14,
+ab10: 15,
+ab11: 16,
+ab12: 17,
+ab13: 18,
+ab14: 19,
+ab15: 20,
+_reset: 21,
+_wait: 22,
+wait: 22,
+_int: 23,
+int: 23,
+_irq: 23,
+irq: 23,
+_nmi: 24,
+nmi: 24,
+_busrq: 25,
+busrq: 25,
+_m1: 26,
+_rd: 27,
+_wr: 28,
+_mreq: 29,
+_iorq: 30,
+_rfsh: 31,
+db0: 32,
+db1: 33,
+db2: 34,
+db3: 35,
+db4: 36,
+db5: 37,
+db6: 38,
+db7: 39,
+_halt: 40,
+_busak: 41,
+// T-States
+t1: 115,
+t2: 137,
+t3: 144,
+t4: 166,
+t5: 134,
+t6: 168,
+// Machine cycles
+m1: 155,
+m2: 173,
+m3: 163,
+m4: 159,
+m5: 209,
+m6: 210,
+// EXX latches
+ex_af: 631,
+ex_bcdehl: 1770,
+ex_dehl0: 625,
+ex_dehl1: 629,
+ex_dehl_combined: 626,
+// Registers
+reg_a0: 2245,
+reg_a1: 2319,
+reg_a2: 2357,
+reg_a3: 2442,
+reg_a4: 2463,
+reg_a5: 2552,
+reg_a6: 2586,
+reg_a7: 2656,
+reg_f0: 1827,
+reg_f1: 1903,
+reg_f2: 1928,
+reg_f3: 2009,
+reg_f4: 2032,
+reg_f5: 2107,
+reg_f6: 2132,
+reg_f7: 2209,
+reg_b0: 2242,
+reg_b1: 2316,
+reg_b2: 2354,
+reg_b3: 2439,
+reg_b4: 2460,
+reg_b5: 2549,
+reg_b6: 2583,
+reg_b7: 2653,
+reg_c0: 1824,
+reg_c1: 1900,
+reg_c2: 1925,
+reg_c3: 2006,
+reg_c4: 2029,
+reg_c5: 2104,
+reg_c6: 2129,
+reg_c7: 2206,
+reg_d0: 2238,
+reg_d1: 2312,
+reg_d2: 2350,
+reg_d3: 2435,
+reg_d4: 2456,
+reg_d5: 2545,
+reg_d6: 2579,
+reg_d7: 2649,
+reg_e0: 1820,
+reg_e1: 1896,
+reg_e2: 1921,
+reg_e3: 2002,
+reg_e4: 2025,
+reg_e5: 2100,
+reg_e6: 2125,
+reg_e7: 2202,
+reg_h0: 2240,
+reg_h1: 2314,
+reg_h2: 2352,
+reg_h3: 2437,
+reg_h4: 2458,
+reg_h5: 2547,
+reg_h6: 2581,
+reg_h7: 2651,
+reg_l0: 1822,
+reg_l1: 1898,
+reg_l2: 1923,
+reg_l3: 2004,
+reg_l4: 2027,
+reg_l5: 2102,
+reg_l6: 2127,
+reg_l7: 2204,
+reg_w0: 2234,
+reg_w1: 2308,
+reg_w2: 2346,
+reg_w3: 2431,
+reg_w4: 2452,
+reg_w5: 2541,
+reg_w6: 2575,
+reg_w7: 2645,
+reg_z0: 1816,
+reg_z1: 1892,
+reg_z2: 1917,
+reg_z3: 1998,
+reg_z4: 2021,
+reg_z5: 2096,
+reg_z6: 2121,
+reg_z7: 2198,
+reg_pch0: 2232,
+reg_pch1: 2306,
+reg_pch2: 2344,
+reg_pch3: 2429,
+reg_pch4: 2450,
+reg_pch5: 2539,
+reg_pch6: 2573,
+reg_pch7: 2643,
+reg_pcl0: 1814,
+reg_pcl1: 1890,
+reg_pcl2: 1915,
+reg_pcl3: 1996,
+reg_pcl4: 2019,
+reg_pcl5: 2094,
+reg_pcl6: 2119,
+reg_pcl7: 2196,
+reg_sph0: 2235,
+reg_sph1: 2309,
+reg_sph2: 2347,
+reg_sph3: 2432,
+reg_sph4: 2453,
+reg_sph5: 2542,
+reg_sph6: 2576,
+reg_sph7: 2646,
+reg_spl0: 1817,
+reg_spl1: 1893,
+reg_spl2: 1918,
+reg_spl3: 1999,
+reg_spl4: 2022,
+reg_spl5: 2097,
+reg_spl6: 2122,
+reg_spl7: 2199,
+reg_ixh0: 2237,
+reg_ixh1: 2311,
+reg_ixh2: 2349,
+reg_ixh3: 2434,
+reg_ixh4: 2455,
+reg_ixh5: 2544,
+reg_ixh6: 2578,
+reg_ixh7: 2648,
+reg_ixl0: 1819,
+reg_ixl1: 1895,
+reg_ixl2: 1920,
+reg_ixl3: 2001,
+reg_ixl4: 2024,
+reg_ixl5: 2099,
+reg_ixl6: 2124,
+reg_ixl7: 2201,
+reg_iyh0: 2236,
+reg_iyh1: 2310,
+reg_iyh2: 2348,
+reg_iyh3: 2433,
+reg_iyh4: 2454,
+reg_iyh5: 2543,
+reg_iyh6: 2577,
+reg_iyh7: 2647,
+reg_iyl0: 1818,
+reg_iyl1: 1894,
+reg_iyl2: 1919,
+reg_iyl3: 2000,
+reg_iyl4: 2023,
+reg_iyl5: 2098,
+reg_iyl6: 2123,
+reg_iyl7: 2200,
+reg_i0: 2233,
+reg_i1: 2307,
+reg_i2: 2345,
+reg_i3: 2430,
+reg_i4: 2451,
+reg_i5: 2540,
+reg_i6: 2574,
+reg_i7: 2644,
+reg_r0: 1815,
+reg_r1: 1891,
+reg_r2: 1916,
+reg_r3: 1997,
+reg_r4: 2020,
+reg_r5: 2095,
+reg_r6: 2120,
+reg_r7: 2197,
+reg_aa0: 2244,
+reg_aa1: 2318,
+reg_aa2: 2356,
+reg_aa3: 2441,
+reg_aa4: 2462,
+reg_aa5: 2551,
+reg_aa6: 2585,
+reg_aa7: 2655,
+reg_ff0: 1826,
+reg_ff1: 1902,
+reg_ff2: 1927,
+reg_ff3: 2008,
+reg_ff4: 2031,
+reg_ff5: 2106,
+reg_ff6: 2131,
+reg_ff7: 2208,
+reg_bb0: 2243,
+reg_bb1: 2317,
+reg_bb2: 2355,
+reg_bb3: 2440,
+reg_bb4: 2461,
+reg_bb5: 2550,
+reg_bb6: 2584,
+reg_bb7: 2654,
+reg_cc0: 1825,
+reg_cc1: 1901,
+reg_cc2: 1926,
+reg_cc3: 2007,
+reg_cc4: 2030,
+reg_cc5: 2105,
+reg_cc6: 2130,
+reg_cc7: 2207,
+reg_dd0: 2239,
+reg_dd1: 2313,
+reg_dd2: 2351,
+reg_dd3: 2436,
+reg_dd4: 2457,
+reg_dd5: 2546,
+reg_dd6: 2580,
+reg_dd7: 2650,
+reg_ee0: 1821,
+reg_ee1: 1897,
+reg_ee2: 1922,
+reg_ee3: 2003,
+reg_ee4: 2026,
+reg_ee5: 2101,
+reg_ee6: 2126,
+reg_ee7: 2203,
+reg_hh0: 2241,
+reg_hh1: 2315,
+reg_hh2: 2353,
+reg_hh3: 2438,
+reg_hh4: 2459,
+reg_hh5: 2548,
+reg_hh6: 2582,
+reg_hh7: 2652,
+reg_ll0: 1823,
+reg_ll1: 1899,
+reg_ll2: 1924,
+reg_ll3: 2005,
+reg_ll4: 2028,
+reg_ll5: 2103,
+reg_ll6: 2128,
+reg_ll7: 2205,
+// Data buses and control
+dp_dl: 82,
+dl_dp: 165,
+load_ir: 1354,
+dlatch0: 123,
+dlatch1: 195,
+dlatch2: 414,
+dlatch3: 930,
+dlatch4: 1000,
+dlatch5: 872,
+dlatch6: 751,
+dlatch7: 358,
+dl_d: 87,
+d_dl: 133,
+dbus0: 138,
+dbus1: 196,
+dbus2: 412,
+dbus3: 480,
+dbus4: 485,
+dbus5: 486,
+dbus6: 380,
+dbus7: 370,
+_instr0: 1350,
+_instr1: 1360,
+_instr2: 1366,
+_instr3: 1380,
+_instr4: 1388,
+_instr5: 1395,
+_instr6: 1370,
+_instr7: 1375,
+instr0: 1348,
+instr1: 1359,
+instr2: 1365,
+instr3: 1379,
+instr4: 1387,
+instr5: 1394,
+instr6: 1369,
+instr7: 1374,
+d_u: 546,
+ubus0: 545,
+ubus1: 528,
+ubus2: 526,
+ubus3: 770,
+ubus4: 779,
+ubus5: 790,
+ubus6: 716,
+ubus7: 525,
+u_v: 750,
+vbus0: 755,
+vbus1: 772,
+vbus2: 783,
+vbus3: 796,
+vbus4: 803,
+vbus5: 808,
+vbus6: 836,
+vbus7: 839,
+rl_wr: 678,
+rh_wr: 652,
+r_u: 692,
+r_v: 693,
+regbit0: 702,
+regbit1: 732,
+regbit2: 738,
+regbit3: 775,
+regbit4: 776,
+regbit5: 807,
+regbit6: 809,
+regbit7: 864,
+regbit8: 870,
+regbit9: 902,
+regbit10: 906,
+regbit11: 934,
+regbit12: 935,
+regbit13: 970,
+regbit14: 973,
+regbit15: 999,
+r_p: 1785,
+r_x1: 608,
+pcbit0: 703,
+pcbit1: 731,
+pcbit2: 739,
+pcbit3: 774,
+pcbit4: 777,
+pcbit5: 806,
+pcbit6: 810,
+pcbit7: 863,
+pcbit8: 871,
+pcbit9: 901,
+pcbit10: 907,
+pcbit11: 933,
+pcbit12: 936,
+pcbit13: 969,
+pcbit14: 974,
+pcbit15: 998,
+// ALU
+alubus0: 837,
+alubus1: 889,
+alubus2: 937,
+alubus3: 983,
+alubus4: 852,
+alubus5: 903,
+alubus6: 951,
+alubus7: 995,
+alua0: 850,
+alua1: 899,
+alua2: 947,
+alua3: 993,
+alua4: 868,
+alua5: 920,
+alua6: 968,
+alua7: 1007,
+alub0: 845,
+alub1: 897,
+alub2: 944,
+alub3: 988,
+alub4: 867,
+alub5: 918,
+alub6: 966,
+alub7: 1005,
+aluout0: 2211,
+aluout1: 2338,
+aluout2: 2504,
+aluout3: 816,
+alulat0: 865,
+alulat1: 912,
+alulat2: 960,
+alulat3: 1002,
+// PLA
+pla0: 287,
+pla1: 332,
+pla2: 314,
+pla3: 333,
+pla4: 315,
+pla5: 334,
+pla6: 316,
+pla7: 335,
+pla8: 317,
+pla9: 336,
+pla10: 318,
+pla11: 361,
+pla12: 261,
+pla13: 337,
+pla14: 319,
+pla15: 464,
+pla16: 288,
+pla17: 338,
+pla18: 320,
+pla19: 364,
+pla20: 325,
+pla21: 324,
+pla22: 308,
+pla23: 289,
+pla24: 339,
+pla25: 313,
+pla26: 340,
+pla27: 290,
+pla28: 341,
+pla29: 291,
+pla30: 342,
+pla31: 292,
+pla32: 365,
+pla33: 293,
+pla34: 362,
+pla35: 294,
+pla36: 331,
+pla37: 293,
+pla38: 343,
+pla39: 296,
+pla40: 297,
+pla41: 298,
+pla42: 344,
+pla43: 299,
+pla44: 269,
+pla45: 300,
+pla46: 237,
+pla47: 301,
+pla48: 345,
+pla49: 302,
+pla50: 346,
+pla51: 264,
+pla52: 266,
+pla53: 347,
+pla54: 303,
+pla55: 356,
+pla56: 227,
+pla57: 366,
+pla58: 304,
+pla59: 305,
+pla60: 271,
+pla61: 348,
+pla62: 306,
+pla63: 309,
+pla64: 311,
+pla65: 312,
+pla66: 307,
+pla67: 367,
+pla68: 272,
+pla69: 349,
+pla70: 273,
+pla71: 350,
+pla72: 274,
+pla73: 351,
+pla74: 275,
+pla75: 276,
+pla76: 268,
+pla77: 352,
+pla78: 277,
+pla79: 278,
+pla80: 279,
+pla81: 280,
+pla82: 368,
+pla83: 281,
+pla84: 282,
+pla85: 283,
+pla86: 284,
+pla87: 285,
+pla88: 286,
+pla89: 321,
+pla90: 353,
+pla91: 322,
+pla92: 354,
+pla93: 323,
+pla94: 369,
+pla95: 258,
+pla96: 249,
+pla97: 245,
+pla98: 355,
+}

chip-z80/testprogram.js

@@ -0,0 +1,73 @@
+// This file testprogram.js can be substituted by one of several tests
+testprogramAddress=0x0000;
+
+// we want to auto-clear the console if any output is sent by the program
+var consoleboxStream="";
+
+// demonstrate write hook
+writeTriggers[0x8000]="consoleboxStream += String.fromCharCode(d);"+
+    "consolebox.innerHTML = consoleboxStream;";
+
+// demonstrate read hook (not used by this test program)
+readTriggers[0x8004]="((consolegetc==undefined)?0:0xff)";  // return zero until we have a char
+readTriggers[0x8000]="var c=consolegetc; consolegetc=undefined; (c)";
+
+// for opcodes, see http://www.textfiles.com/programming/CARDS/6800
+
+testprogram = [
+    0x00,                    // NOP
+    0x31, 0x00, 0x01,        // LD SP,0x0100
+    0xCD, 0x0B, 0x00,        // CALL $000B
+    0x00,                    // NOP
+    0x21, 0x78, 0x56,        // LD HL,$5678
+    0x21, 0x34, 0x12,        // LD HL,$1234
+    0xe5,                    // PUSH HL
+    0x00,                    // NOP
+    0x00,                    // NOP
+    0x3C,                    // INC A
+    0x04,                    // INC B
+    0x15,                    // DEC D
+    0x24,                    // INC H
+    0xEB,                    // EXX DE,HL
+    0x00,                    // NOP
+    0x3C,                    // INC A
+    0x04,                    // INC B
+    0x15,                    // DEC D
+    0x24,                    // INC H
+    0xD9,                    // EXX
+    0x00,                    // NOP
+    0x3C,                    // INC A
+    0x04,                    // INC B
+    0x15,                    // DEC D
+    0x24,                    // INC H
+    0xEB,                    // EXX DE,HL
+    0x00,                    // NOP
+    0x3C,                    // INC A
+    0x04,                    // INC B
+    0x15,                    // DEC D
+    0x24,                    // INC H
+    0x08,                    // EXX AF,AF'
+    0x00,                    // NOP
+    0x3C,                    // INC A
+    0x04,                    // INC B
+    0x15,                    // DEC D
+    0x24,                    // INC H
+    0x00,                    // NOP
+    0x00,                    // NOP
+    0x00,                    // NOP
+    0x21, 0x00, 0x01,        // LD HL,$0100
+    0x36, 0xCC,              // LD (HL),$CC
+    0x00,                    // NOP
+    0x7E,                    // LD A, (HL)
+    0x00,                    // NOP
+    // Pavel's original test program
+    0x21, 0x34, 0x12,        // LD HL,$1234
+    0x31, 0xfe, 0xdc,        // LD SP,0xDCFE
+    0xe5,                    // PUSH HL
+    0x21, 0x78, 0x56,        // LD HL,$5678
+    0xe3,                    // EX (SP),HL
+    0xdd, 0x21, 0xbc,0x9a,   // LD IX, 0x9ABC
+    0xdd, 0xe3,              // EX (SP),IX
+    0x76,                    // HALT
+    0x00                     // NOP    
+]

chipsim.js

@@ -158,7 +158,7 @@ function allNodes(){
 function stateString(){
 	var codes = ['l','h'];
 	var res = '';
-	for(var i=0;i<1725;i++){
+	for(var i=0;i<nodes.length;i++){
 		var n = nodes[i];
 		if(n==undefined) res+='x';
 		else if(i==ngnd) res+='g';

expert-allinone.js

@@ -11879,8 +11879,8 @@ p2: 1553,       // I bit of status register (storage node)
 p3: 348,        // D bit of status register (storage node)
 p4: 1119,       // there is no bit4 in the status register! (not a storage node)
 p5: -1,         // there is no bit5 in the status register! (not a storage node)
-p6: 77,         // V bit of status register (storage node)
+p6: 1625,       // V bit of status register (storage node)
-p7: 1370,       // N bit of status register (storage node)
+p7: 69,         // N bit of status register (storage node)
 
                 // internal bus: status register outputs for push P
 Pout0: 687,
@@ -12102,7 +12102,7 @@ notRnWprepad: 187, // internal signal: to pad, yet to be inverted and retimed
 RnWstretched: 353, // internal signal: control datapad output drivers, aka TRISTATE
 "#DBE": 1035,      // internal signal: formerly from DBE pad (6501)
 cp1: 710,       // internal signal: clock phase 1
-cclk: 943,      // unbonded pad: internal non-overlappying phi2
+cclk: 943,      // unbonded pad: internal non-overlapping phi2
 fetch: 879,     // internal signal
 clearIR: 1077,  // internal signal
 D1x1: 827,      // internal signal: interrupt handler related
@@ -12281,7 +12281,8 @@ INTG: 1350,     // internal signal: interrupt handler related
 
 // internal signals: control signals
 nnT2BR: 967,    // doubly inverted
-BRtaken: 1544,  // aka #TAKEN
+"#BRtaken": 1544,  // aka #TAKEN
+"~BRtaken": 1544,   // automatic alias replacing hash with tilde
 
 // interrupt and vector related
 NMIP: 1032,
@@ -12469,7 +12470,10 @@ AxB7: 1241,
 // internal signals: datapath control signals
 
 "ADL/ABL": 639,      // load ABL latches from ADL bus
+"dpc-1_ADL/ABL": 639,// alias for DPControl pseudo-bus
+
 "ADH/ABH": 821,      // load ABH latches from ADH bus
+"dpc-2_ADH/ABH": 821,// alias for DPControl pseudo-bus
 
 dpc0_YSB: 801,       // drive sb from y
 dpc1_SBY: 325,       // load y from sb
@@ -14022,6 +14026,71 @@ function listActiveTCStates() {
 	return s.join("+");
 }
 
+    // Show all time code node states (active and inactive) in fixed format,
+    // with non-PLA-controlling internal state indication in square
+    // brackets, followed by RCL-resident timing state indication.
+    // ".." for a PLA-controlling node indicates inactive state, "T"* for a
+    // PLA-controlling node indicates active state.
+    // Bracketed codes are one of T1/V0/T6/..
+    // V0 indicates the VEC0 node, T6 is a synonym for the VEC1 node.
+    // The RCL codes are one of SD1/SD2/...
+    // For discussion of this reconstruction, see:
+    // http://visual6502.org/wiki/index.php?title=6502_Timing_States
+function allTCStates( useHTML )
+{
+    var s = "";
+    var _spc;
+    useHTML = (typeof useHTML === 'undefined') ? false : useHTML;
+        // Use Non-Breaking Space for presentation in an HTML (browser)
+        // context, else use ASCII space for logging context
+    _spc = useHTML ? ' ' : ' ';
+    if ( !isNodeHigh( nodenames[ 'clock1' ] ) ) s += "T0"; else s += "..";
+    s += _spc;
+        // T+ in visual6502 is called T1x in
+        // http://www.weihenstephan.org/~michaste/pagetable/6502/6502.jpg
+        // Notated as T+ for compatibility with PLA node names
+    if ( !isNodeHigh( nodenames[ 'clock2' ] ) ) s += "T+"; else s += "..";
+    s += _spc;
+    if ( !isNodeHigh( nodenames[ 't2' ] ) ) s += "T2"; else s += "..";
+    s += _spc;
+    if ( !isNodeHigh( nodenames[ 't3' ] ) ) s += "T3"; else s += "..";
+    s += _spc;
+    if ( !isNodeHigh( nodenames[ 't4' ] ) ) s += "T4"; else s += "..";
+    s += _spc;
+    if ( !isNodeHigh( nodenames[ 't5' ] ) ) s += "T5"; else s += "..";
+    s += _spc + "[";
+    // Check three confirmed exclusive states (three nodes)
+    if ( isNodeHigh( 862 ) ) {
+        s += "T1";
+        // ...else if VEC0 is on...
+    } else if ( isNodeHigh( nodenames[ 'VEC0' ] ) ) {
+        // ...then tell the outside world
+        s += "V0";
+        // ...else if VEC1 is on...
+    } else if ( isNodeHigh( nodenames[ 'VEC1' ] ) ) {
+        // ...then this is the canonical T6. It is a synonym for VEC1
+        s += "T6";
+    } else {
+        // ...else none of the "hidden" bits in the clock state is active
+        s += "..";
+    }
+    s += "]" + _spc;
+    // Check the RCL's two confirmed exclusive states (two nodes)
+        // If this node is grounding ~WR...
+    if ( isNodeHigh( 440 ) ) {
+        // ...then we can regard this state as Store Data 1
+        s += "SD1";
+        // ...else if this node is grounding ~WR...
+    } else if ( isNodeHigh( 1258 ) ) {
+        // ...then we can regard this state as Store Data 2
+        s += "SD2";
+    } else {
+        // ...else none of the RCL-resident timing bits is active
+        s += "...";
+    }
+    return s;
+}
+
 function readBit(name){
         return isNodeHigh(nodenames[name])?1:0;
 }
@@ -14048,6 +14117,13 @@ function busToString(busname){
 		return ['clock1','clock2','t2','t3','t4','t5'].map(busToHex).join("");
 	if(busname=='State')
 		return listActiveTCStates();
+	if(busname=='TState')
+		return allTCStates( true );
+	if(busname=='Phi')
+		// Pretty-printed phase indication based on the state of cp1,
+                // the internal Phase 1 node
+		return 'Φ' +
+		       (isNodeHigh( nodenames[ 'cp1' ] ) ? '1' : '2');
 	if(busname=='Execute')
 		return dis6502toHTML(readBits('ir',8));
 	if(busname=='Fetch')
@@ -14057,7 +14133,7 @@ function busToString(busname){
 		//    - we'll allow the x and xx prefix but ignore the #
 		return listActiveSignals('^([x]?x-)?op-');
 	if(busname=='DPControl')
-		return listActiveSignals('^dpc[0-9]+_');
+		return listActiveSignals('^dpc[-]?[0-9]+_');
 	if(busname[0]=="-"){
 		// invert the value of the bus for display
 		var value=busToHex(busname.slice(1))

expert-z80.html

@@ -0,0 +1,151 @@
+<!DOCTYPE html>
+
+<head>
+<title>Visual Z80 in JavaScript</title>
+<style type="text/css">@import "expert.css";</style>
+<script src="chip-z80/segdefs.js"></script>
+<script src="chip-z80/transdefs.js"></script>
+<script src="chip-z80/nodenames.js"></script>
+<script src="wires.js"></script>
+<script src="expertWires.js"></script>
+<script src="chipsim.js"></script>
+<script src="memtable.js"></script>
+<script src="macros.js"></script>
+<script src="chip-z80/support.js"></script>
+<script src="chip-z80/testprogram.js"></script>
+<script src="3rdparty/jquery-1.3.2.min.js"></script>
+<script src="3rdparty/jquery.cookie.js"></script>
+<script src="3rdparty/splitter.js"></script>
+
+<script type="text/javascript">
+function handleOnload() {
+	/MSIE (\d+\.\d+);/.test(navigator.appVersion);
+	IEVersion=Number(RegExp.$1);
+	if((navigator.appName == 'Microsoft Internet Explorer') && (IEVersion<9)){
+		document.getElementById('browsertrouble').innerHTML=
+			'<p>Sorry, '+navigator.appName+' not supported - showing you a picture instead!</p>';
+		document.getElementById('frame').innerHTML='<a href="browsertrouble.html"><img src="images/jssim2.png" style="border:10px"></a>';
+	}else{
+		setTimeout(setup,200);
+	}
+};
+
+// initialise splitter (built on jquery)
+$().ready(function(){
+	$("#frame").splitter({
+		type: "v",
+		outline: true,
+		minLeft: 20,
+		sizeLeft: 810,
+		resizeToWidth: true,
+		anchorToWindow: true,
+	});
+	$("#rightcolumn").splitter({
+		type: "h",
+		outline: true,
+		sizeBottom: 180,
+		minTop: 100,
+	});
+});
+</script>
+
+</head>
+
+<body onload="handleOnload();">
+<span id="plain">
+<a href="http://www.visual6502.org/faq.html">FAQ</a>&nbsp;
+<a href="http://blog.visual6502.org">Blog</a>&nbsp;
+<a href="http://www.visual6502.org/links.html">Links</a>&nbsp;
+<a href="http://github.com/trebonian/visual6502">Source</a>&nbsp;
+</span>
+<div class="frame" id="frame">
+<div class="leftcolumn" id="leftcolumn">
+<div id="chipsurround" tabindex="1">
+<div class="chip" id="chip">
+<span id="waiting">Please wait, graphics initialising...</span>
+<canvas class="chip" id="chipbg"></canvas>
+<canvas class="chip" id="overlay"></canvas>
+<canvas class="chip" id="hilite"></canvas>
+<canvas class="chip" id="hitbuffer"></canvas>
+</div>
+</div> <!-- chipsurround -->
+<div class="nochip" id="nochip">
+  <form>
+  <input type="button" value="Show chip layout" onclick="updateChipLayoutVisibility(true)" />
+  </form>
+</div>
+<div id="layoutControlPanel">
+  Use 'z' or '>' to zoom in, 'x' or '<' to zoom out, click to probe signals and drag to pan.
+  <form id="updateShow"> Show:
+  <input type="checkbox" name="1" id="updateShow1" onchange="updateShow(this.name,this.checked)" />(diffusion)
+  <input type="checkbox" name="3" id="updateShow3" onchange="updateShow(this.name,this.checked)" />(grounded diffusion)
+  <input type="checkbox" name="4" id="updateShow4" onchange="updateShow(this.name,this.checked)" />(powered diffusion)
+  <input type="checkbox" name="5" id="updateShow5" onchange="updateShow(this.name,this.checked)" />(polysilicon)
+  <input type="checkbox" name="0" id="updateShow0" onchange="updateShow(this.name,this.checked)" />(metal)
+  <input type="checkbox" name="2" id="updateShow2" onchange="updateShow(this.name,this.checked)" />(protection)
+  </form>
+  <form action="javascript:hiliteNodeList();">
+  <input type="button" value="Find:" onclick="hiliteNodeList();" />
+  <input type="text" id="HighlightThese" name="HighlightThese" value="" />
+  <input type="button" value="Clear Highlighting" onclick="clearHighlight();" />
+  <span class="animatebox">
+    Animate during simulation:
+    <input type="checkbox" id="animateModeCheckbox" onchange="updateChipLayoutAnimation(this.checked)" 
+    /></span>
+  </form>
+  <form>
+  <input type="button" value="Hide Chip Layout" onclick="updateChipLayoutVisibility(false)" />
+  <a href="" id="linkHere" >Link to this location</a>
+  </form>
+</div>
+</div> <!-- closing leftcolumn -->
+<div class="rightcolumn" id="rightcolumn">
+<div id="righttopdiv">
+<div class = "buttons">
+  <div class="twobuttons">
+    <a href ="javascript:stopChip()" id="stop"><img class="navstop" src="images/stop.png" title="stop"></a>
+    <a href ="javascript:runChip()"  id="start"><img class="navplay" src="images/play.png" title="run"></a>
+  </div>
+  <div class="morebuttons">
+    <a href ="javascript:resetChip()"><img class="navbutton" src="images/up.png" title="reset"></a>
+    <a href ="javascript:stepBack()"><img class="navbutton" src="images/prev.png" title="back"></a>
+    <a href ="javascript:stepForward()"><img class="navbutton" src="images/next.png" title="forward"></a>
+    <a href ="javascript:goUntilSyncOrWrite()"><img class="navbutton" src="images/singlestep.png" title="step"></a>
+    <a href ="javascript:goFor()"><img class="navbutton" src="images/fastforward.png" title="fastforward"></a>
+  </div>
+  <div style="float:right;">
+    <a href="http://visual6502.org/wiki/index.php?title=JssimUserHelp" target="_blank">User Guide</a>
+    &nbsp;
+  </div>
+</div>  <!-- buttons -->
+<div class="status" id="status"><p>x: 0<br>y: 0</p>
+</div> <!-- status -->
+
+   <div id="memtablediv">
+	<table class="memtable" id="memtable" tabindex="2"></table>
+   </div>
+</div> <!-- righttopdiv -->
+
+   <div id="tracingdiv">
+        <textarea id="consolebox">
+click here and type if your program handles input
+        </textarea>
+	<div id="expertControlPanel" tabindex="3">
+	  <form action="javascript:updateLogList()">
+	  <input type="button" value="Trace more" onclick="updateLoglevel(++loglevel)" />
+	  <input type="button" value="Trace less" onclick="updateLoglevel(--loglevel)" />
+	  <input type="button" value="Trace these too:" onclick="updateLogList()" />
+            <input type="text" id="LogThese" name="LogThese" value="" />
+	  <input type="button" value="Log Up/Down" onclick="updateLogDirection();" />
+	  <input type="button" value="Clear Log" onclick="updateLoglevel(loglevel)" />
+	  </form>
+	  <br />
+	</div>
+	<div id="logstreamscroller">
+	       <table class="logstream" id="logstream"></table>
+	</div>
+   </div>
+</div> <!-- closing rightcolumn -->
+</div> <!-- closing 'frame' div -->
+</body>
+</html>

expert.html

@@ -56,8 +56,8 @@ $().ready(function(){
 <a href="http://blog.visual6502.org">Blog</a>&nbsp;
 <a href="http://www.visual6502.org/links.html">Links</a>&nbsp;
 <a href="http://github.com/trebonian/visual6502">Source</a>&nbsp;
-<a href="http://skilldrick.github.com/easy6502/#first-program">easy6502 assembler</a>&nbsp;
+<a href="http://skilldrick.github.io/easy6502/#first-program">easy6502 assembler</a>&nbsp;
-<a href="http://www.e-tradition.net/bytes/6502/disassembler.html">e-tradition disassembler</a>&nbsp;
+<a href="http://www.masswerk.at/6502/disassembler.html">mass:werk disassembler</a>&nbsp;
 </span>
 <div class="frame" id="frame">
 <div class="leftcolumn" id="leftcolumn">
@@ -115,7 +115,7 @@ $().ready(function(){
     <a href ="javascript:goFor()"><img class="navbutton" src="images/fastforward.png" title="fastforward"></a>
   </div>
   <div style="float:right;">
-    <a href="http://visual6502.org/wiki/index.php?title=JssimUserHelp" target="_blank">User Guide</a>
+    <a href="https://web.archive.org/web/20210608195625/http://visual6502.org/wiki/index.php?title=JssimUserHelp" target="_blank">User Guide</a>
     &nbsp;
   </div>
 </div>  <!-- buttons -->

expertWires.js

@@ -37,12 +37,14 @@ var labelThese=[];
 //   overlay - a red/white transparency to show logic high or low
 //   hilite - to show the selected polygon
 //   hitbuffer - abusing color values to return which polygon is under a point
-// we no longer use a scaling transform - we now scale the chip data at 
+// we no longer use a scaling transform - we now scale the chip data at
 //   the point of drawing line segments
 // if the canvas is any smaller than chip coordinates there will be
 //   rounding artifacts, and at high zoom there will be anti-aliasing on edges.
 var grMaxZoom=12;
 var grChipSize=10000;
+var grChipOffsetX=400;
+var grChipOffsetY=0;
 var grCanvasSize=2000;
 var grLineWidth=1;
 
@@ -51,7 +53,7 @@ var layernames = ['metal', 'switched diffusion', 'inputdiode', 'grounded diffusi
 var colors = ['rgba(128,128,192,0.4)','#FFFF00','#FF00FF','#4DFF4D',
               '#FF4D4D','#801AC0','rgba(128,0,255,0.75)'];
 var drawlayers = [true, true, true, true, true, true];
-              
+
 // some modes and parameters which can be passed in from the URL query
 var moveHereFirst;
 var expertMode=true;
@@ -210,6 +212,24 @@ function setupParams(){
 			clockTriggers[value]=[clockTriggers[value],"setLow('rdy');"].join("");
 		} else if(name=="rdy1" && parseInt(value)!=NaN){
 			clockTriggers[value]=[clockTriggers[value],"setHigh('rdy');"].join("");
+		} else if(name=="so0" && parseInt(value)!=NaN){
+			clockTriggers[value]=[clockTriggers[value],"setLow('so');"].join("");
+		} else if(name=="so1" && parseInt(value)!=NaN){
+			clockTriggers[value]=[clockTriggers[value],"setHigh('so');"].join("");
+		// Some Z80 inputs - we can refactor if this becomes unwieldy
+		} else if(name=="int0" && parseInt(value)!=NaN){
+			clockTriggers[value]=[clockTriggers[value],"setLow('int');"].join("");
+		} else if(name=="int1" && parseInt(value)!=NaN){
+			clockTriggers[value]=[clockTriggers[value],"setHigh('int');"].join("");
+		} else if(name=="wait0" && parseInt(value)!=NaN){
+			clockTriggers[value]=[clockTriggers[value],"setLow('wait');"].join("");
+		} else if(name=="wait1" && parseInt(value)!=NaN){
+			clockTriggers[value]=[clockTriggers[value],"setHigh('wait');"].join("");
+		} else if(name=="busrq0" && parseInt(value)!=NaN){
+			clockTriggers[value]=[clockTriggers[value],"setLow('busrq');"].join("");
+		} else if(name=="busrq1" && parseInt(value)!=NaN){
+			clockTriggers[value]=[clockTriggers[value],"setHigh('busrq');"].join("");
+		//
 		} else if(name=="time" && parseInt(value)!=NaN){
 			eventTime=value;
 		} else if(name=="databus" && parseInt(value)!=NaN){
@@ -257,13 +277,22 @@ function handleKey(e){
 	else if(c=='p') stepBack();
 }
 
+//  handler for zoom in/out using the mouse wheel
+function handleWheelZoom(e){
+	chipsurround.focus();
+	e.preventDefault();
+	var n = e.deltaY / 100;
+	if(n>0 && zoom>1) setZoom(zoom/1.2);
+	if(n<0 && zoom<grMaxZoom) setZoom(zoom*1.2);
+}
+
 //  handler for mousedown events over chip display
 //  must handle click-to-select (and focus), and drag to pan
 function mouseDown(e){
 	chipsurround.focus();
 	e.preventDefault();
-	moved=false;	
+	moved=false;
-	dragMouseX = e.clientX;	
+	dragMouseX = e.clientX;
 	dragMouseY = e.clientY;
 	chipsurround.onmousemove = function(e){mouseMove(e)};
 	chipsurround.onmouseup = function(e){mouseUp(e)};
@@ -286,7 +315,7 @@ function mouseMove(e){
 }
 
 function mouseUp(e){
-	if(!moved) handleClick(e);	
+	if(!moved) handleClick(e);
 	chipsurround.onmousemove = undefined;
 	chipsurround.onmouseup = undefined;
 }
@@ -330,8 +359,8 @@ function updateLinkHere(){
 //   boxLabel(['PD',   50, 8424, 3536, 9256, 2464])
 //   boxLabel(['IR',   50, 8432, 2332, 9124,  984])
 //   boxLabel(['PLA', 100, 1169, 2328, 8393,  934])
-//   boxLabel(['Y',    50, 2143, 8820, 2317, 5689])  
+//   boxLabel(['Y',    50, 2143, 8820, 2317, 5689])
-//   boxLabel(['X',    50, 2317, 8820, 2490, 5689])  
+//   boxLabel(['X',    50, 2317, 8820, 2490, 5689])
 //   boxLabel(['S',    50, 2490, 8820, 2814, 5689])
 //   boxLabel(['ALU',  50, 2814, 8820, 4525, 5689])
 //   boxLabel(['DAdj', 40, 4525, 8820, 5040, 5689])
@@ -457,7 +486,7 @@ function hiliteNodeList(){
 // the localx and localy functions return canvas coordinate offsets from the canvas window top left corner
 // we divide the results by 'zoom' to get drawn coordinates useful in findNodeNumber
 // to convert to reported user chip coordinates we multiply by grChipSize/600
-// to compare to segdefs and transdefs coordinates we subtract 400 from x and subtract y from grChipSize
+// to compare to segdefs and transdefs coordinates we subtract grChipOffsetX from x and subtract y from grChipSize plus grChipOffsetY
 
 function handleClick(e){
 	var x = localx(hilite, e.clientX)/zoom;
@@ -467,7 +496,7 @@ function handleClick(e){
 	var cx = Math.round(x*grChipSize/600);
 	var cy = Math.round(y*grChipSize/600);
 	// prepare two lines of status report
-	var s1='x: ' + cx + ' y: ' + cy;
+	var s1='x: ' + (cx - grChipOffsetX) + ' y: ' + (cy - grChipOffsetY);
 	var s2='node:&nbsp;' + w + '&nbsp;' + nodeName(w);
 	if(w==-1) {
 		setStatus(s1); // no node found, so report only coordinates
@@ -476,8 +505,8 @@ function handleClick(e){
 	// we have a node, but maybe we clicked over a transistor
 	var nodelist=[w];
 	// match the coordinate against transistor gate bounding boxes
-	x=cx-400;
+	x=cx-grChipOffsetX;
-	y=grChipSize-cy;
+	y=grChipSize+grChipOffsetY-cy;
 	for(var i=0;i<nodes[w].gates.length;i++){
 		var xmin=nodes[w].gates[i].bb[0], xmax=nodes[w].gates[i].bb[1];
 		var ymin=nodes[w].gates[i].bb[2], ymax=nodes[w].gates[i].bb[3];
@@ -579,8 +608,10 @@ function setupChipLayoutGraphics(){
 	}
 	// grant focus to the chip display to enable zoom keys
 	chipsurround.focus();
+	chipsurround.onwheel = function(e){handleWheelZoom(e);};
 	chipsurround.onmousedown = function(e){mouseDown(e);};
 	chipsurround.onkeypress = function(e){handleKey(e);};
+	chipsurround.onmouseout = function(e){mouseLeave(e);};
 }
 
 // utility function to save graphics pan and zoom

index.html

@@ -66,7 +66,7 @@ Keyboard controls: 'z' to zoom in, 'x' to zoom out, 'n' to step the simulation.
 <br />
 Mouse controls: Left-click and drag to scroll around (when you're zoomed in.)
 <br />
-More information in the <a href="http://visual6502.org/wiki/index.php?title=JssimUserHelp">User Guide</a>.
+More information in the <a href="https://web.archive.org/web/20210608195625/http://visual6502.org/wiki/index.php?title=JssimUserHelp">User Guide</a>.
 <br />
 <br /> 
 </span>
@@ -97,8 +97,8 @@ More information in the <a href="http://visual6502.org/wiki/index.php?title=Jssi
 <br />
 <br />
 Source code is available on <a href="http://github.com/trebonian/visual6502">github visual6502</a>.
-Use the online <a href="http://skilldrick.github.com/easy6502/#first-program">emulator and assembler</a> from the easy6502 tutorial
+Use the online <a href="https://skilldrick.github.io/easy6502/#first-program">emulator and assembler</a> from the easy6502 tutorial
-and <a href="http://www.e-tradition.net/bytes/6502/disassembler.html">disassembler</a> from e-tradition.net
+and <a href="http://www.masswerk.at/6502/disassembler.html">disassembler</a> from mass:werk
 <br />
 For in-depth 6502 investigation and some more advanced features, try our <a href="expert.html">Advanced</a> page.
 <br />

kioskWires.js

@@ -45,6 +45,8 @@ var userResetHigh;
 //   rounding artifacts, and at high zoom there will be anti-aliasing on edges.
 var grMaxZoom=12;
 var grChipSize=10000;
+var grChipOffsetX=400;
+var grChipOffsetY=0;
 var grCanvasSize=2000;
 var grLineWidth=1;
 

macros.js

@@ -304,6 +304,71 @@ function listActiveTCStates() {
 	return s.join("+");
 }
 
+    // Show all time code node states (active and inactive) in fixed format,
+    // with non-PLA-controlling internal state indication in square
+    // brackets, followed by RCL-resident timing state indication.
+    // ".." for a PLA-controlling node indicates inactive state, "T"* for a
+    // PLA-controlling node indicates active state.
+    // Bracketed codes are one of T1/V0/T6/..
+    // V0 indicates the VEC0 node, T6 is a synonym for the VEC1 node.
+    // The RCL codes are one of SD1/SD2/...
+    // For discussion of this reconstruction, see:
+    // http://visual6502.org/wiki/index.php?title=6502_Timing_States
+function allTCStates( useHTML )
+{
+    var s = "";
+    var _spc;
+    useHTML = (typeof useHTML === 'undefined') ? false : useHTML;
+        // Use Non-Breaking Space for presentation in an HTML (browser)
+        // context, else use ASCII space for logging context
+    _spc = useHTML ? ' ' : ' ';
+    if ( !isNodeHigh( nodenames[ 'clock1' ] ) ) s += "T0"; else s += "..";
+    s += _spc;
+        // T+ in visual6502 is called T1x in
+        // http://www.weihenstephan.org/~michaste/pagetable/6502/6502.jpg
+        // Notated as T+ for compatibility with PLA node names
+    if ( !isNodeHigh( nodenames[ 'clock2' ] ) ) s += "T+"; else s += "..";
+    s += _spc;
+    if ( !isNodeHigh( nodenames[ 't2' ] ) ) s += "T2"; else s += "..";
+    s += _spc;
+    if ( !isNodeHigh( nodenames[ 't3' ] ) ) s += "T3"; else s += "..";
+    s += _spc;
+    if ( !isNodeHigh( nodenames[ 't4' ] ) ) s += "T4"; else s += "..";
+    s += _spc;
+    if ( !isNodeHigh( nodenames[ 't5' ] ) ) s += "T5"; else s += "..";
+    s += _spc + "[";
+    // Check three confirmed exclusive states (three nodes)
+    if ( isNodeHigh( 862 ) ) {
+        s += "T1";
+        // ...else if VEC0 is on...
+    } else if ( isNodeHigh( nodenames[ 'VEC0' ] ) ) {
+        // ...then tell the outside world
+        s += "V0";
+        // ...else if VEC1 is on...
+    } else if ( isNodeHigh( nodenames[ 'VEC1' ] ) ) {
+        // ...then this is the canonical T6. It is a synonym for VEC1
+        s += "T6";
+    } else {
+        // ...else none of the "hidden" bits in the clock state is active
+        s += "..";
+    }
+    s += "]" + _spc;
+    // Check the RCL's two confirmed exclusive states (two nodes)
+        // If this node is grounding ~WR...
+    if ( isNodeHigh( 440 ) ) {
+        // ...then we can regard this state as Store Data 1
+        s += "SD1";
+        // ...else if this node is grounding ~WR...
+    } else if ( isNodeHigh( 1258 ) ) {
+        // ...then we can regard this state as Store Data 2
+        s += "SD2";
+    } else {
+        // ...else none of the RCL-resident timing bits is active
+        s += "...";
+    }
+    return s;
+}
+
 function readBit(name){
         return isNodeHigh(nodenames[name])?1:0;
 }
@@ -330,6 +395,13 @@ function busToString(busname){
 		return ['clock1','clock2','t2','t3','t4','t5'].map(busToHex).join("");
 	if(busname=='State')
 		return listActiveTCStates();
+	if(busname=='TState')
+		return allTCStates( true );
+	if(busname=='Phi')
+		// Pretty-printed phase indication based on the state of cp1,
+                // the internal Phase 1 node
+		return 'Φ' +
+		       (isNodeHigh( nodenames[ 'cp1' ] ) ? '1' : '2');
 	if(busname=='Execute')
 		return disassemblytoHTML(readBits('ir',8));
 	if(busname=='Fetch')
@@ -339,7 +411,7 @@ function busToString(busname){
 		//    - we'll allow the x and xx prefix but ignore the #
 		return listActiveSignals('^([x]?x-)?op-');
 	if(busname=='DPControl')
-		return listActiveSignals('^dpc[0-9]+_');
+		return listActiveSignals('^dpc[-]?[0-9]+_');
 	if(busname[0]=="-"){
 		// invert the value of the bus for display
 		var value=busToHex(busname.slice(1))

nodenames.js

@@ -153,8 +153,8 @@ p2: 1553,       // I bit of status register (storage node)
 p3: 348,        // D bit of status register (storage node)
 p4: 1119,       // there is no bit4 in the status register! (not a storage node)
 p5: -1,         // there is no bit5 in the status register! (not a storage node)
-p6: 77,         // V bit of status register (storage node)
+p6: 1625,       // V bit of status register (storage node)
-p7: 1370,       // N bit of status register (storage node)
+p7: 69,         // N bit of status register (storage node)
 
                 // internal bus: status register outputs for push P
 Pout0: 687,
@@ -405,7 +405,7 @@ RnWstretched: 353, // internal signal: control datapad output drivers, aka TRIST
 "#DBE": 1035,      // internal signal: formerly from DBE pad (6501)
 "~DBE": 1035,       // automatic alias replacing hash with tilde
 cp1: 710,       // internal signal: clock phase 1
-cclk: 943,      // unbonded pad: internal non-overlappying phi2
+cclk: 943,      // unbonded pad: internal non-overlapping phi2
 fetch: 879,     // internal signal
 clearIR: 1077,  // internal signal
 H1x1: 1042,     // internal signal: drive status byte onto databus
@@ -590,8 +590,8 @@ H1x1: 1042,     // internal signal: drive status byte onto databus
 
 // internal signals: control signals
 nnT2BR: 967,    // doubly inverted
-BRtaken: 1544,  // aka #TAKEN
+"#BRtaken": 1544,  // aka #TAKEN
-BRtaken: 1544,   // automatic alias replacing hash with tilde
+"~BRtaken": 1544,   // automatic alias replacing hash with tilde
 
 // internal signals and state: interrupt and vector related
 // segher says:
@@ -863,7 +863,10 @@ AxB7: 1241,
 // internal signals: datapath control signals
 
 "ADL/ABL": 639,      // load ABL latches from ADL bus
+"dpc-1_ADL/ABL": 639,// alias for DPControl pseudo-bus
+
 "ADH/ABH": 821,      // load ABH latches from ADH bus
+"dpc-2_ADH/ABH": 821,// alias for DPControl pseudo-bus
 
 dpc0_YSB: 801,       // drive sb from y
 dpc1_SBY: 325,       // load y from sb

wires.js

@@ -204,18 +204,33 @@ function ctxDrawBox(ctx, xMin, yMin, xMax, yMax){
 function zoomToBox(xmin,xmax,ymin,ymax){
 	var xmid=(xmin+xmax)/2;
 	var ymid=(ymin+ymax)/2;
-	var x=(xmid+400)/grChipSize*600;
+	var x=(xmid+grChipOffsetX)/grChipSize*600;
-	var y=600-ymid/grChipSize*600;
+	var y=600-(ymid-grChipOffsetY)/grChipSize*600;
-	var zoom=5;  // pending a more careful calculation
+	// Zoom to fill 80% of the window with the selection
+	var fillfactor=0.80;
+	var dx=xmax-xmin;
+	var dy=ymax-ymin;
+	if (dx < 1) dx=1;
+	if (dy < 1) dy=1;
+	var zx=(800/600)*fillfactor*grChipSize/dx;
+	var zy=fillfactor*grChipSize/dy;
+	var zoom=Math.min(zx,zy);
+	if (zoom < 1) {
+		zoom = 1;
+	}
+	if (zoom > grMaxZoom) {
+		zoom = grMaxZoom;
+	}
 	moveHere([x,y,zoom]);
 }
 
 function drawSeg(ctx, seg){
-	var dx = 400;
+	var dx = grChipOffsetX;
+	var dy = grChipOffsetY;
 	ctx.beginPath();
-	ctx.moveTo(grScale(seg[0]+dx), grScale(grChipSize-seg[1]));
+	ctx.moveTo(grScale(seg[0]+dx), grScale(grChipSize-seg[1]+dy));
-	for(var i=2;i<seg.length;i+=2) ctx.lineTo(grScale(seg[i]+dx), grScale(grChipSize-seg[i+1]));
+	for(var i=2;i<seg.length;i+=2) ctx.lineTo(grScale(seg[i]+dx), grScale(grChipSize-seg[i+1]+dy));
-	ctx.lineTo(grScale(seg[0]+dx), grScale(grChipSize-seg[1]));
+	ctx.lineTo(grScale(seg[0]+dx), grScale(grChipSize-seg[1]+dy));
 }
 
 function findNodeNumber(x,y){