1 EESchema Schematic File Version 4 2 LIBS:AcornElectronMainboard-cache 3 EELAYER 26 0 4 EELAYER END 5 $Descr A4 11693 8268 6 encoding utf-8 7 Sheet 7 9 8 Title "" 9 Date "" 10 Rev "" 11 Comp "" 12 Comment1 "" 13 Comment2 "" 14 Comment3 "" 15 Comment4 "" 16 $EndDescr 17 $Comp 18 L AcornElectron:6502A IC? 19 U 1 1 61F22EDC 20 P 5400 4050 21 AR Path="/61F22EDC" Ref="IC?" Part="1" 22 AR Path="/61F2273C/61F22EDC" Ref="IC3" Part="1" 23 F 0 "IC3" H 5400 5528 50 0000 C CNN 24 F 1 "6502A" H 5400 5437 50 0000 C CNN 25 F 2 "" H 5400 4050 50 0001 C CNN 26 F 3 "" H 5400 4050 50 0001 C CNN 27 1 5400 4050 28 1 0 0 -1 29 $EndComp 30 Wire Wire Line 31 5900 4300 6000 4300 32 NoConn ~ 5900 4500 33 NoConn ~ 5900 4600 34 Wire Wire Line 35 5700 2750 5700 1300 36 Text Label 4900 3100 2 50 ~ 0 37 A0 38 Text Label 4900 3200 2 50 ~ 0 39 A1 40 Text Label 4900 3300 2 50 ~ 0 41 A2 42 Text Label 4900 3400 2 50 ~ 0 43 A3 44 Text Label 4900 3500 2 50 ~ 0 45 A4 46 Text Label 4900 3600 2 50 ~ 0 47 A5 48 Text Label 4900 3700 2 50 ~ 0 49 A6 50 Text Label 4900 3800 2 50 ~ 0 51 A7 52 Text Label 4900 3900 2 50 ~ 0 53 A8 54 Text Label 4900 4000 2 50 ~ 0 55 A9 56 Text Label 4900 4100 2 50 ~ 0 57 A10 58 Text Label 4900 4200 2 50 ~ 0 59 A11 60 Text Label 4900 4300 2 50 ~ 0 61 A12 62 Text Label 4900 4400 2 50 ~ 0 63 A13 64 Text Label 4900 4500 2 50 ~ 0 65 A14 66 Text Label 4900 4600 2 50 ~ 0 67 A15 68 Wire Bus Line 69 4400 1500 6800 1500 70 Entry Wire Line 71 4400 3000 4500 3100 72 Entry Wire Line 73 4400 3100 4500 3200 74 Entry Wire Line 75 4400 3200 4500 3300 76 Entry Wire Line 77 4400 3300 4500 3400 78 Entry Wire Line 79 4400 3400 4500 3500 80 Entry Wire Line 81 4400 3500 4500 3600 82 Entry Wire Line 83 4400 3600 4500 3700 84 Entry Wire Line 85 4400 3700 4500 3800 86 Entry Wire Line 87 4400 3800 4500 3900 88 Entry Wire Line 89 4400 3900 4500 4000 90 Entry Wire Line 91 4400 4000 4500 4100 92 Entry Wire Line 93 4400 4100 4500 4200 94 Entry Wire Line 95 4400 4200 4500 4300 96 Entry Wire Line 97 4400 4300 4500 4400 98 Entry Wire Line 99 4400 4400 4500 4500 100 Entry Wire Line 101 4400 4500 4500 4600 102 Wire Wire Line 103 4500 3100 4900 3100 104 Wire Wire Line 105 4500 3200 4900 3200 106 Wire Wire Line 107 4500 3300 4900 3300 108 Wire Wire Line 109 4500 3400 4900 3400 110 Wire Wire Line 111 4500 3500 4900 3500 112 Wire Wire Line 113 4500 3600 4900 3600 114 Wire Wire Line 115 4500 3700 4900 3700 116 Wire Wire Line 117 4500 3800 4900 3800 118 Wire Wire Line 119 4500 3900 4900 3900 120 Wire Wire Line 121 4500 4000 4900 4000 122 Wire Wire Line 123 4500 4100 4900 4100 124 Wire Wire Line 125 4500 4200 4900 4200 126 Wire Wire Line 127 4500 4300 4900 4300 128 Wire Wire Line 129 4500 4400 4900 4400 130 Wire Wire Line 131 4500 4500 4900 4500 132 Wire Wire Line 133 4500 4600 4900 4600 134 $Comp 135 L Connector_Generic:Conn_01x22 PL? 136 U 1 1 61F22F1C 137 P 1100 3200 138 AR Path="/61F22F1C" Ref="PL?" Part="1" 139 AR Path="/61F2273C/61F22F1C" Ref="PL2" Part="1" 140 F 0 "PL2" H 1020 4417 50 0000 C CNN 141 F 1 "Keyboard" H 1020 4326 50 0000 C CNN 142 F 2 "" H 1100 3200 50 0001 C CNN 143 F 3 "~" H 1100 3200 50 0001 C CNN 144 1 1100 3200 145 -1 0 0 -1 146 $EndComp 147 $Comp 148 L ROM:ROM_32K IC? 149 U 1 1 61F22F23 150 P 3300 3700 151 AR Path="/61F22F23" Ref="IC?" Part="1" 152 AR Path="/61F2273C/61F22F23" Ref="IC2" Part="1" 153 F 0 "IC2" H 3300 4600 50 0000 C CNN 154 F 1 "ROM_32K" H 3300 4500 50 0000 C CNN 155 F 2 "" H 3300 3700 50 0001 C CNN 156 F 3 "" H 3300 3700 50 0001 C CNN 157 1 3300 3700 158 1 0 0 -1 159 $EndComp 160 Wire Bus Line 161 4400 1500 2200 1500 162 Connection ~ 4400 1500 163 Entry Wire Line 164 2200 3100 2300 3200 165 Entry Wire Line 166 2200 3200 2300 3300 167 Entry Wire Line 168 2200 3300 2300 3400 169 Entry Wire Line 170 2200 3400 2300 3500 171 Entry Wire Line 172 2200 3500 2300 3600 173 Entry Wire Line 174 2200 3600 2300 3700 175 Entry Wire Line 176 2200 3700 2300 3800 177 Entry Wire Line 178 2200 3800 2300 3900 179 Entry Wire Line 180 2200 3900 2300 4000 181 Entry Wire Line 182 2200 4000 2300 4100 183 Entry Wire Line 184 2200 4100 2300 4200 185 Entry Wire Line 186 2200 4200 2300 4300 187 Entry Wire Line 188 2200 4300 2300 4400 189 Entry Wire Line 190 2200 4400 2300 4500 191 Entry Wire Line 192 2200 4500 2300 4600 193 Wire Wire Line 194 2300 3200 2800 3200 195 Wire Wire Line 196 2300 3300 2800 3300 197 Wire Wire Line 198 2300 3400 2800 3400 199 Wire Wire Line 200 2300 3500 2800 3500 201 Wire Wire Line 202 2300 3600 2800 3600 203 Wire Wire Line 204 2300 3700 2800 3700 205 Wire Wire Line 206 2300 3800 2800 3800 207 Wire Wire Line 208 2300 3900 2800 3900 209 Wire Wire Line 210 2300 4000 2800 4000 211 Wire Wire Line 212 2300 4100 2800 4100 213 Wire Wire Line 214 2300 4200 2800 4200 215 Wire Wire Line 216 2300 4300 2800 4300 217 Wire Wire Line 218 2300 4400 2800 4400 219 Wire Wire Line 220 2300 4500 2800 4500 221 Wire Wire Line 222 2300 4600 2800 4600 223 Text Label 5900 3200 0 50 ~ 0 224 D0 225 Text Label 5900 3300 0 50 ~ 0 226 D1 227 Text Label 5900 3400 0 50 ~ 0 228 D2 229 Text Label 5900 3500 0 50 ~ 0 230 D3 231 Text Label 5900 3600 0 50 ~ 0 232 D4 233 Text Label 5900 3700 0 50 ~ 0 234 D5 235 Text Label 5900 3800 0 50 ~ 0 236 D6 237 Text Label 5900 3900 0 50 ~ 0 238 D7 239 Entry Wire Line 240 6600 3200 6700 3300 241 Entry Wire Line 242 6600 3300 6700 3400 243 Entry Wire Line 244 6600 3400 6700 3500 245 Entry Wire Line 246 6600 3500 6700 3600 247 Entry Wire Line 248 6600 3600 6700 3700 249 Entry Wire Line 250 6600 3700 6700 3800 251 Entry Wire Line 252 6600 3800 6700 3900 253 Entry Wire Line 254 6600 3900 6700 4000 255 Entry Wire Line 256 3900 3700 4000 3800 257 Entry Wire Line 258 3900 3800 4000 3900 259 Entry Wire Line 260 3900 3900 4000 4000 261 Entry Wire Line 262 3900 4000 4000 4100 263 Entry Wire Line 264 3900 4100 4000 4200 265 Entry Wire Line 266 3900 4200 4000 4300 267 Entry Wire Line 268 3900 4300 4000 4400 269 Entry Wire Line 270 3900 4400 4000 4500 271 Wire Wire Line 272 3800 3700 3900 3700 273 Wire Wire Line 274 3800 3800 3900 3800 275 Wire Wire Line 276 3800 3900 3900 3900 277 Wire Wire Line 278 3800 4000 3900 4000 279 Wire Wire Line 280 3800 4100 3900 4100 281 Wire Wire Line 282 3800 4200 3900 4200 283 Wire Wire Line 284 3800 4300 3900 4300 285 Wire Wire Line 286 3800 4400 3900 4400 287 Wire Wire Line 288 6800 1700 4000 1700 289 Wire Wire Line 290 4000 1700 4000 3500 291 Entry Wire Line 292 2100 3000 2200 3100 293 Entry Wire Line 294 2100 3100 2200 3200 295 Entry Wire Line 296 2100 3200 2200 3300 297 Entry Wire Line 298 2100 3300 2200 3400 299 Entry Wire Line 300 2100 3400 2200 3500 301 Entry Wire Line 302 2100 3500 2200 3600 303 Entry Wire Line 304 2100 3600 2200 3700 305 Entry Wire Line 306 2100 3700 2200 3800 307 Entry Wire Line 308 2100 3800 2200 3900 309 Entry Wire Line 310 2100 3900 2200 4000 311 Entry Wire Line 312 2100 4000 2200 4100 313 Entry Wire Line 314 2100 4100 2200 4200 315 Entry Wire Line 316 2100 4200 2200 4300 317 Entry Wire Line 318 2100 4300 2200 4400 319 Wire Wire Line 320 1300 3000 2100 3000 321 Wire Wire Line 322 1300 3100 2100 3100 323 Wire Wire Line 324 1300 3200 2100 3200 325 Wire Wire Line 326 1300 3300 2100 3300 327 Wire Wire Line 328 1300 3400 2100 3400 329 Wire Wire Line 330 1300 3500 2100 3500 331 Wire Wire Line 332 1300 3600 2100 3600 333 Wire Wire Line 334 1300 3700 2100 3700 335 Wire Wire Line 336 1300 3800 2100 3800 337 Wire Wire Line 338 1300 3900 2100 3900 339 Wire Wire Line 340 1300 4000 2100 4000 341 Wire Wire Line 342 1300 4100 2100 4100 343 Wire Wire Line 344 1300 4200 2100 4200 345 Wire Wire Line 346 1300 4300 2100 4300 347 Text Label 2800 3200 2 50 ~ 0 348 A0 349 Text Label 2800 3300 2 50 ~ 0 350 A1 351 Text Label 2800 3400 2 50 ~ 0 352 A2 353 Text Label 2800 3500 2 50 ~ 0 354 A3 355 Text Label 2800 3600 2 50 ~ 0 356 A4 357 Text Label 2800 3700 2 50 ~ 0 358 A5 359 Text Label 2800 3800 2 50 ~ 0 360 A6 361 Text Label 2800 3900 2 50 ~ 0 362 A7 363 Text Label 2800 4000 2 50 ~ 0 364 A8 365 Text Label 2800 4100 2 50 ~ 0 366 A9 367 Text Label 2800 4200 2 50 ~ 0 368 A10 369 Text Label 2800 4300 2 50 ~ 0 370 A11 371 Text Label 2800 4400 2 50 ~ 0 372 A12 373 Text Label 2800 4500 2 50 ~ 0 374 A13 375 Text Label 2800 4600 2 50 ~ 0 376 A14 377 Text Label 1300 3900 0 50 ~ 0 378 A0 379 Text Label 1300 4000 0 50 ~ 0 380 A1 381 Text Label 1300 4100 0 50 ~ 0 382 A2 383 Text Label 1300 4200 0 50 ~ 0 384 A3 385 Text Label 1300 4300 0 50 ~ 0 386 A4 387 Text Label 1300 3000 0 50 ~ 0 388 A13 389 Text Label 1300 3100 0 50 ~ 0 390 A12 391 Text Label 1300 3200 0 50 ~ 0 392 A11 393 Text Label 1300 3300 0 50 ~ 0 394 A10 395 Text Label 1300 3400 0 50 ~ 0 396 A9 397 Text Label 1300 3500 0 50 ~ 0 398 A8 399 Text Label 1300 3600 0 50 ~ 0 400 A7 401 Text Label 1300 3700 0 50 ~ 0 402 A6 403 Text Label 1300 3800 0 50 ~ 0 404 A5 405 Text Label 3800 3700 0 50 ~ 0 406 D0 407 Text Label 3800 3800 0 50 ~ 0 408 D1 409 Text Label 3800 3900 0 50 ~ 0 410 D2 411 Text Label 3800 4000 0 50 ~ 0 412 D3 413 Text Label 3800 4100 0 50 ~ 0 414 D4 415 Text Label 3800 4200 0 50 ~ 0 416 D5 417 Text Label 3800 4300 0 50 ~ 0 418 D6 419 Text Label 3800 4400 0 50 ~ 0 420 D7 421 Connection ~ 5700 1300 422 Wire Wire Line 423 7500 900 1800 900 424 Wire Wire Line 425 1800 900 1800 2300 426 Wire Wire Line 427 1800 2300 1300 2300 428 Text Label 1300 2200 0 50 ~ 0 429 BREAK 430 Text Label 1300 2300 0 50 ~ 0 431 CAPS_LOCK 432 Text Label 1300 2400 0 50 ~ 0 433 0V 434 Text Label 1300 2500 0 50 ~ 0 435 5V 436 Text Label 1300 2600 0 50 ~ 0 437 KBD0 438 Text Label 1300 2700 0 50 ~ 0 439 KBD1 440 Text Label 1300 2800 0 50 ~ 0 441 KBD2 442 Text Label 1300 2900 0 50 ~ 0 443 KBD3 444 Entry Wire Line 445 1900 2600 2000 2500 446 Entry Wire Line 447 1900 2700 2000 2600 448 Entry Wire Line 449 1900 2800 2000 2700 450 Entry Wire Line 451 1900 2900 2000 2800 452 Wire Wire Line 453 1300 2600 1900 2600 454 Wire Wire Line 455 1300 2700 1900 2700 456 Wire Wire Line 457 1300 2800 1900 2800 458 Wire Wire Line 459 1300 2900 1900 2900 460 Wire Wire Line 461 4000 3500 3800 3500 462 NoConn ~ 4900 4800 463 $Comp 464 L Jumper:Jumper_3_Open LK? 465 U 1 1 61F22FC4 466 P 4550 5250 467 AR Path="/61F22FC4" Ref="LK?" Part="1" 468 AR Path="/61F2273C/61F22FC4" Ref="LK1" Part="1" 469 F 0 "LK1" H 4550 5382 50 0000 C CNN 470 F 1 "ROM type" H 4550 5473 50 0000 C CNN 471 F 2 "" H 4550 5250 50 0001 C CNN 472 F 3 "~" H 4550 5250 50 0001 C CNN 473 1 4550 5250 474 -1 0 0 1 475 $EndComp 476 Wire Wire Line 477 3800 3400 4100 3400 478 Wire Wire Line 479 4100 3400 4100 5000 480 Wire Wire Line 481 4100 5000 4550 5000 482 Wire Wire Line 483 4550 5000 4550 5100 484 Wire Wire Line 485 4800 5250 4800 4900 486 Wire Wire Line 487 4800 4900 4900 4900 488 Text GLabel 3550 2400 1 50 Input ~ 0 489 5V 490 Wire Wire Line 491 3550 3000 3550 2500 492 Text GLabel 5200 2400 1 50 Input ~ 0 493 5V 494 Wire Wire Line 495 5200 2750 5200 2400 496 $Comp 497 L Device:C C? 498 U 1 1 61F22FD5 499 P 3750 2750 500 AR Path="/61F22FD5" Ref="C?" Part="1" 501 AR Path="/61F2273C/61F22FD5" Ref="C?" Part="1" 502 F 0 "C?" H 3865 2796 50 0000 L CNN 503 F 1 "A" H 3865 2705 50 0000 L CNN 504 F 2 "" H 3788 2600 50 0001 C CNN 505 F 3 "~" H 3750 2750 50 0001 C CNN 506 1 3750 2750 507 1 0 0 -1 508 $EndComp 509 Text GLabel 3550 5700 3 50 Input ~ 0 510 0V 511 Text GLabel 5300 5700 3 50 Input ~ 0 512 0V 513 Wire Wire Line 514 3550 5700 3550 4900 515 Wire Wire Line 516 3550 4900 4200 4900 517 Wire Wire Line 518 4200 4900 4200 3000 519 Wire Wire Line 520 4200 3000 3750 3000 521 Wire Wire Line 522 3750 3000 3750 2900 523 Connection ~ 3550 4900 524 Wire Wire Line 525 3550 4900 3550 4800 526 Wire Wire Line 527 3750 2600 3750 2500 528 Wire Wire Line 529 3750 2500 3550 2500 530 Connection ~ 3550 2500 531 Wire Wire Line 532 3550 2500 3550 2400 533 Wire Wire Line 534 5300 5700 5300 5400 535 Wire Wire Line 536 5300 5400 5500 5400 537 Wire Wire Line 538 5500 5400 5500 5300 539 Connection ~ 5300 5400 540 Wire Wire Line 541 5300 5400 5300 5300 542 Text GLabel 1600 2500 2 50 Input ~ 0 543 5V 544 Text GLabel 1600 2400 2 50 Input ~ 0 545 0V 546 Wire Wire Line 547 1300 2400 1600 2400 548 Wire Wire Line 549 1300 2500 1600 2500 550 Text GLabel 4300 5700 3 50 Input ~ 0 551 0V 552 Wire Wire Line 553 4300 5700 4300 5250 554 Text Label 4800 5200 1 50 ~ 0 555 Toshiba 556 Text Label 4300 5300 3 50 ~ 0 557 Hitachi 558 Wire Wire Line 559 1900 2200 1300 2200 560 Wire Wire Line 561 5700 1300 1900 1300 562 Wire Wire Line 563 1900 1300 1900 2200 564 Text GLabel 6000 4700 2 50 Input ~ 0 565 RDY 566 Wire Wire Line 567 5900 4200 6200 4200 568 Wire Wire Line 569 5900 4100 6800 4100 570 Wire Wire Line 571 5700 1300 7500 1300 572 Wire Bus Line 573 4000 6100 6700 6100 574 Wire Wire Line 575 5900 4700 6000 4700 576 Wire Wire Line 577 5900 3200 6600 3200 578 Wire Wire Line 579 5900 3300 6600 3300 580 Wire Wire Line 581 5900 3400 6600 3400 582 Wire Wire Line 583 5900 3500 6600 3500 584 Wire Wire Line 585 5900 3600 6600 3600 586 Wire Wire Line 587 5900 3700 6600 3700 588 Wire Wire Line 589 5900 3800 6600 3800 590 Wire Wire Line 591 5900 3900 6600 3900 592 Text GLabel 8500 4000 2 50 Input ~ 0 593 ~NMI 594 Text GLabel 6200 4200 2 50 Input ~ 0 595 ~IRQ 596 Text GLabel 6000 4300 2 50 Output ~ 0 597 RnW 598 Text GLabel 7700 5000 2 50 Input ~ 0 599 PHI_OUT 600 Text GLabel 6800 1500 2 50 Output ~ 0 601 CPU_ADDRESS 602 Text GLabel 6800 6100 2 50 BiDi ~ 0 603 CPU_DATA 604 Wire Bus Line 605 6800 6100 6700 6100 606 Connection ~ 6700 6100 607 Text GLabel 6800 1100 2 50 Output ~ 0 608 KBD_DATA 609 Wire Bus Line 610 6800 1100 2000 1100 611 Text GLabel 7500 1300 2 50 Output ~ 0 612 ~RST 613 Text GLabel 6800 1700 2 50 Input ~ 0 614 ROM 615 Text GLabel 7500 900 2 50 Output ~ 0 616 CAPS_LOCK 617 Text Notes 6800 3200 0 50 ~ 0 618 Issue 6 boards tend to have\nIC18 (74LS08) fitted for some\nkind of buffering for ~NMI\nand for PHI_OUT.\n\nLK8 is made to enable buffering via IC18 for ~NMI.\nLK9 is made to disable buffering via IC18 for PHI_OUT.\n\nOn such boards, without any links made, buffering\nonly seems to be done for PHI_OUT.\n 619 $Comp 620 L 74xx:74LS08 IC18 621 U 4 1 61F0E37D 622 P 7200 4900 623 F 0 "IC18" H 7200 4583 50 0000 C CNN 624 F 1 "74LS08" H 7200 4674 50 0000 C CNN 625 F 2 "" H 7200 4900 50 0001 C CNN 626 F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 7200 4900 50 0001 C CNN 627 4 7200 4900 628 -1 0 0 1 629 $EndComp 630 Text GLabel 7700 4500 2 50 Input ~ 0 631 BUFFER_ENABLE 632 Wire Wire Line 633 7700 4500 7600 4500 634 Wire Wire Line 635 7700 5000 7600 5000 636 Wire Wire Line 637 5900 4900 6800 4900 638 $Comp 639 L Jumper:Jumper_2_Open LK9 640 U 1 1 61F22F77 641 P 7200 5400 642 F 0 "LK9" H 7200 5635 50 0000 C CNN 643 F 1 "Disable buffer" H 7200 5544 50 0000 C CNN 644 F 2 "" H 7200 5400 50 0001 C CNN 645 F 3 "~" H 7200 5400 50 0001 C CNN 646 1 7200 5400 647 1 0 0 -1 648 $EndComp 649 Wire Wire Line 650 7400 5400 7600 5400 651 Wire Wire Line 652 7600 5400 7600 5000 653 Connection ~ 7600 5000 654 Wire Wire Line 655 7600 5000 7500 5000 656 Wire Wire Line 657 7000 5400 6800 5400 658 Wire Wire Line 659 6800 5400 6800 4900 660 Connection ~ 6800 4900 661 Wire Wire Line 662 6800 4900 6900 4900 663 $Comp 664 L 74xx:74LS08 IC18 665 U 2 1 61F3624E 666 P 7200 4100 667 F 0 "IC18" H 7200 4425 50 0000 C CNN 668 F 1 "74LS08" H 7200 4334 50 0000 C CNN 669 F 2 "" H 7200 4100 50 0001 C CNN 670 F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 7200 4100 50 0001 C CNN 671 2 7200 4100 672 -1 0 0 -1 673 $EndComp 674 $Comp 675 L Jumper:Jumper_2_Open LK8 676 U 1 1 61F363E2 677 P 8000 4000 678 F 0 "LK8" H 8000 4235 50 0000 C CNN 679 F 1 "Enable buffer" H 8000 4144 50 0000 C CNN 680 F 2 "" H 8000 4000 50 0001 C CNN 681 F 3 "~" H 8000 4000 50 0001 C CNN 682 1 8000 4000 683 1 0 0 -1 684 $EndComp 685 Text GLabel 8100 3600 2 50 Input ~ 0 686 5V 687 Wire Wire Line 688 7800 4000 7600 4000 689 Wire Wire Line 690 7600 4500 7600 4200 691 Wire Wire Line 692 7600 4200 7500 4200 693 Connection ~ 7600 4500 694 Wire Wire Line 695 7600 4500 7600 4800 696 Wire Wire Line 697 7600 4800 7500 4800 698 Wire Wire Line 699 8500 4000 8400 4000 700 Wire Wire Line 701 7600 4000 7600 3600 702 Connection ~ 7600 4000 703 Wire Wire Line 704 7600 4000 7500 4000 705 $Comp 706 L Device:R R74 707 U 1 1 61F7EEAC 708 P 7850 3600 709 F 0 "R74" V 7643 3600 50 0000 C CNN 710 F 1 "4700R" V 7734 3600 50 0000 C CNN 711 F 2 "" V 7780 3600 50 0001 C CNN 712 F 3 "~" H 7850 3600 50 0001 C CNN 713 1 7850 3600 714 0 1 1 0 715 $EndComp 716 Wire Wire Line 717 7600 3600 7700 3600 718 Wire Wire Line 719 8000 3600 8100 3600 720 Wire Wire Line 721 6800 4100 6800 3300 722 Wire Wire Line 723 6800 3300 8400 3300 724 Wire Wire Line 725 8400 3300 8400 4000 726 Connection ~ 6800 4100 727 Wire Wire Line 728 6800 4100 6900 4100 729 Connection ~ 8400 4000 730 Wire Wire Line 731 8400 4000 8200 4000 732 $Comp 733 L 74xx:74LS08 IC18 734 U 5 1 61FA23D2 735 P 9300 3100 736 F 0 "IC18" H 9530 3146 50 0000 L CNN 737 F 1 "74LS08" H 9530 3055 50 0000 L CNN 738 F 2 "" H 9300 3100 50 0001 C CNN 739 F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 9300 3100 50 0001 C CNN 740 5 9300 3100 741 1 0 0 -1 742 $EndComp 743 Text GLabel 9300 2500 1 50 Input ~ 0 744 5V 745 Wire Wire Line 746 9300 2500 9300 2600 747 Text GLabel 9300 3700 3 50 Input ~ 0 748 0V 749 Wire Wire Line 750 9300 3700 9300 3600 751 Wire Bus Line 752 2000 1100 2000 2800 753 Wire Bus Line 754 6700 3300 6700 6100 755 Wire Bus Line 756 4000 3800 4000 6100 757 Wire Bus Line 758 2200 1500 2200 4500 759 Wire Bus Line 760 4400 1500 4400 4500 761 $EndSCHEMATC