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 Entry Wire Line 69 4400 3000 4500 3100 70 Entry Wire Line 71 4400 3100 4500 3200 72 Entry Wire Line 73 4400 3200 4500 3300 74 Entry Wire Line 75 4400 3300 4500 3400 76 Entry Wire Line 77 4400 3400 4500 3500 78 Entry Wire Line 79 4400 3500 4500 3600 80 Entry Wire Line 81 4400 3600 4500 3700 82 Entry Wire Line 83 4400 3700 4500 3800 84 Entry Wire Line 85 4400 3800 4500 3900 86 Entry Wire Line 87 4400 3900 4500 4000 88 Entry Wire Line 89 4400 4000 4500 4100 90 Entry Wire Line 91 4400 4100 4500 4200 92 Entry Wire Line 93 4400 4200 4500 4300 94 Entry Wire Line 95 4400 4300 4500 4400 96 Entry Wire Line 97 4400 4400 4500 4500 98 Entry Wire Line 99 4400 4500 4500 4600 100 Wire Wire Line 101 4500 3100 4900 3100 102 Wire Wire Line 103 4500 3200 4900 3200 104 Wire Wire Line 105 4500 3300 4900 3300 106 Wire Wire Line 107 4500 3400 4900 3400 108 Wire Wire Line 109 4500 3500 4900 3500 110 Wire Wire Line 111 4500 3600 4900 3600 112 Wire Wire Line 113 4500 3700 4900 3700 114 Wire Wire Line 115 4500 3800 4900 3800 116 Wire Wire Line 117 4500 3900 4900 3900 118 Wire Wire Line 119 4500 4000 4900 4000 120 Wire Wire Line 121 4500 4100 4900 4100 122 Wire Wire Line 123 4500 4200 4900 4200 124 Wire Wire Line 125 4500 4300 4900 4300 126 Wire Wire Line 127 4500 4400 4900 4400 128 Wire Wire Line 129 4500 4500 4900 4500 130 Wire Wire Line 131 4500 4600 4900 4600 132 $Comp 133 L Connector_Generic:Conn_01x22 PL? 134 U 1 1 61F22F1C 135 P 1100 3200 136 AR Path="/61F22F1C" Ref="PL?" Part="1" 137 AR Path="/61F2273C/61F22F1C" Ref="PL2" Part="1" 138 F 0 "PL2" H 1020 4417 50 0000 C CNN 139 F 1 "Keyboard" H 1020 4326 50 0000 C CNN 140 F 2 "" H 1100 3200 50 0001 C CNN 141 F 3 "~" H 1100 3200 50 0001 C CNN 142 1 1100 3200 143 -1 0 0 -1 144 $EndComp 145 $Comp 146 L ROM:ROM_32K IC? 147 U 1 1 61F22F23 148 P 3300 3700 149 AR Path="/61F22F23" Ref="IC?" Part="1" 150 AR Path="/61F2273C/61F22F23" Ref="IC2" Part="1" 151 F 0 "IC2" H 3300 4600 50 0000 C CNN 152 F 1 "ROM_32K" H 3300 4500 50 0000 C CNN 153 F 2 "" H 3300 3700 50 0001 C CNN 154 F 3 "" H 3300 3700 50 0001 C CNN 155 1 3300 3700 156 1 0 0 -1 157 $EndComp 158 Entry Wire Line 159 2500 3100 2600 3200 160 Entry Wire Line 161 2500 3200 2600 3300 162 Entry Wire Line 163 2500 3300 2600 3400 164 Entry Wire Line 165 2500 3400 2600 3500 166 Entry Wire Line 167 2500 3500 2600 3600 168 Entry Wire Line 169 2500 3600 2600 3700 170 Entry Wire Line 171 2500 3700 2600 3800 172 Entry Wire Line 173 2500 3800 2600 3900 174 Entry Wire Line 175 2500 3900 2600 4000 176 Entry Wire Line 177 2500 4000 2600 4100 178 Entry Wire Line 179 2500 4100 2600 4200 180 Entry Wire Line 181 2500 4200 2600 4300 182 Entry Wire Line 183 2500 4300 2600 4400 184 Entry Wire Line 185 2500 4400 2600 4500 186 Entry Wire Line 187 2500 4500 2600 4600 188 Wire Wire Line 189 2600 3200 2800 3200 190 Wire Wire Line 191 2600 3300 2800 3300 192 Wire Wire Line 193 2600 3400 2800 3400 194 Wire Wire Line 195 2600 3500 2800 3500 196 Wire Wire Line 197 2600 3600 2800 3600 198 Wire Wire Line 199 2600 3700 2800 3700 200 Wire Wire Line 201 2600 3800 2800 3800 202 Wire Wire Line 203 2600 3900 2800 3900 204 Wire Wire Line 205 2600 4000 2800 4000 206 Wire Wire Line 207 2600 4100 2800 4100 208 Wire Wire Line 209 2600 4200 2800 4200 210 Wire Wire Line 211 2600 4300 2800 4300 212 Wire Wire Line 213 2600 4400 2800 4400 214 Wire Wire Line 215 2600 4500 2800 4500 216 Wire Wire Line 217 2600 4600 2800 4600 218 Text Label 5900 3200 0 50 ~ 0 219 D0 220 Text Label 5900 3300 0 50 ~ 0 221 D1 222 Text Label 5900 3400 0 50 ~ 0 223 D2 224 Text Label 5900 3500 0 50 ~ 0 225 D3 226 Text Label 5900 3600 0 50 ~ 0 227 D4 228 Text Label 5900 3700 0 50 ~ 0 229 D5 230 Text Label 5900 3800 0 50 ~ 0 231 D6 232 Text Label 5900 3900 0 50 ~ 0 233 D7 234 Entry Wire Line 235 6600 3200 6700 3300 236 Entry Wire Line 237 6600 3300 6700 3400 238 Entry Wire Line 239 6600 3400 6700 3500 240 Entry Wire Line 241 6600 3500 6700 3600 242 Entry Wire Line 243 6600 3600 6700 3700 244 Entry Wire Line 245 6600 3700 6700 3800 246 Entry Wire Line 247 6600 3800 6700 3900 248 Entry Wire Line 249 6600 3900 6700 4000 250 Entry Wire Line 251 3900 3700 4000 3800 252 Entry Wire Line 253 3900 3800 4000 3900 254 Entry Wire Line 255 3900 3900 4000 4000 256 Entry Wire Line 257 3900 4000 4000 4100 258 Entry Wire Line 259 3900 4100 4000 4200 260 Entry Wire Line 261 3900 4200 4000 4300 262 Entry Wire Line 263 3900 4300 4000 4400 264 Entry Wire Line 265 3900 4400 4000 4500 266 Wire Wire Line 267 3800 3700 3900 3700 268 Wire Wire Line 269 3800 3800 3900 3800 270 Wire Wire Line 271 3800 3900 3900 3900 272 Wire Wire Line 273 3800 4000 3900 4000 274 Wire Wire Line 275 3800 4100 3900 4100 276 Wire Wire Line 277 3800 4200 3900 4200 278 Wire Wire Line 279 3800 4300 3900 4300 280 Wire Wire Line 281 3800 4400 3900 4400 282 Wire Wire Line 283 6800 1700 4000 1700 284 Wire Wire Line 285 4000 1700 4000 3500 286 Wire Wire Line 287 1300 3000 2000 3000 288 Wire Wire Line 289 1300 3100 2000 3100 290 Wire Wire Line 291 1300 3200 2000 3200 292 Wire Wire Line 293 1300 3300 2000 3300 294 Wire Wire Line 295 1300 3400 2000 3400 296 Wire Wire Line 297 1300 3500 2000 3500 298 Wire Wire Line 299 1300 3600 2000 3600 300 Wire Wire Line 301 1300 3700 2000 3700 302 Wire Wire Line 303 1300 3800 2000 3800 304 Wire Wire Line 305 1300 3900 2000 3900 306 Wire Wire Line 307 1300 4000 2000 4000 308 Wire Wire Line 309 1300 4100 2000 4100 310 Wire Wire Line 311 1300 4200 2000 4200 312 Wire Wire Line 313 1300 4300 2000 4300 314 Text Label 2800 3200 2 50 ~ 0 315 A0 316 Text Label 2800 3300 2 50 ~ 0 317 A1 318 Text Label 2800 3400 2 50 ~ 0 319 A2 320 Text Label 2800 3500 2 50 ~ 0 321 A3 322 Text Label 2800 3600 2 50 ~ 0 323 A4 324 Text Label 2800 3700 2 50 ~ 0 325 A5 326 Text Label 2800 3800 2 50 ~ 0 327 A6 328 Text Label 2800 3900 2 50 ~ 0 329 A7 330 Text Label 2800 4000 2 50 ~ 0 331 A8 332 Text Label 2800 4100 2 50 ~ 0 333 A9 334 Text Label 2800 4200 2 50 ~ 0 335 A10 336 Text Label 2800 4300 2 50 ~ 0 337 A11 338 Text Label 2800 4400 2 50 ~ 0 339 A12 340 Text Label 2800 4500 2 50 ~ 0 341 A13 342 Text Label 2800 4600 2 50 ~ 0 343 A14 344 Text Label 1300 3900 0 50 ~ 0 345 A0 346 Text Label 1300 4000 0 50 ~ 0 347 A1 348 Text Label 1300 4100 0 50 ~ 0 349 A2 350 Text Label 1300 4200 0 50 ~ 0 351 A3 352 Text Label 1300 4300 0 50 ~ 0 353 A4 354 Text Label 1300 3000 0 50 ~ 0 355 A13 356 Text Label 1300 3100 0 50 ~ 0 357 A12 358 Text Label 1300 3200 0 50 ~ 0 359 A11 360 Text Label 1300 3300 0 50 ~ 0 361 A10 362 Text Label 1300 3400 0 50 ~ 0 363 A9 364 Text Label 1300 3500 0 50 ~ 0 365 A8 366 Text Label 1300 3600 0 50 ~ 0 367 A7 368 Text Label 1300 3700 0 50 ~ 0 369 A6 370 Text Label 1300 3800 0 50 ~ 0 371 A5 372 Text Label 3800 3700 0 50 ~ 0 373 D0 374 Text Label 3800 3800 0 50 ~ 0 375 D1 376 Text Label 3800 3900 0 50 ~ 0 377 D2 378 Text Label 3800 4000 0 50 ~ 0 379 D3 380 Text Label 3800 4100 0 50 ~ 0 381 D4 382 Text Label 3800 4200 0 50 ~ 0 383 D5 384 Text Label 3800 4300 0 50 ~ 0 385 D6 386 Text Label 3800 4400 0 50 ~ 0 387 D7 388 Connection ~ 5700 1300 389 Wire Wire Line 390 7500 900 1800 900 391 Wire Wire Line 392 1800 900 1800 2300 393 Wire Wire Line 394 1800 2300 1300 2300 395 Text Label 1300 2200 0 50 ~ 0 396 BREAK 397 Text Label 1300 2300 0 50 ~ 0 398 CAPS_LOCK 399 Text Label 1300 2400 0 50 ~ 0 400 0V 401 Text Label 1300 2500 0 50 ~ 0 402 5V 403 Text Label 1300 2600 0 50 ~ 0 404 KBD0 405 Text Label 1300 2700 0 50 ~ 0 406 KBD1 407 Text Label 1300 2800 0 50 ~ 0 408 KBD2 409 Text Label 1300 2900 0 50 ~ 0 410 KBD3 411 Entry Wire Line 412 1900 2600 2000 2500 413 Entry Wire Line 414 1900 2700 2000 2600 415 Entry Wire Line 416 1900 2800 2000 2700 417 Entry Wire Line 418 1900 2900 2000 2800 419 Wire Wire Line 420 1300 2600 1900 2600 421 Wire Wire Line 422 1300 2700 1900 2700 423 Wire Wire Line 424 1300 2800 1900 2800 425 Wire Wire Line 426 1300 2900 1900 2900 427 Wire Wire Line 428 4000 3500 3800 3500 429 NoConn ~ 4900 4800 430 $Comp 431 L Jumper:Jumper_3_Bridged12 LK? 432 U 1 1 61F22FC4 433 P 4550 5250 434 AR Path="/61F22FC4" Ref="LK?" Part="1" 435 AR Path="/61F2273C/61F22FC4" Ref="LK1" Part="1" 436 F 0 "LK1" H 4550 5382 50 0000 C CNN 437 F 1 "ROM type" H 4550 5473 50 0000 C CNN 438 F 2 "" H 4550 5250 50 0001 C CNN 439 F 3 "~" H 4550 5250 50 0001 C CNN 440 1 4550 5250 441 1 0 0 1 442 $EndComp 443 Wire Wire Line 444 3800 3400 4100 3400 445 Wire Wire Line 446 4100 3400 4100 5000 447 Wire Wire Line 448 4100 5000 4450 5000 449 Wire Wire Line 450 4550 5000 4550 5100 451 Wire Wire Line 452 4800 5250 4800 4900 453 Wire Wire Line 454 4800 4900 4900 4900 455 Text GLabel 3550 2400 1 50 Input ~ 0 456 5V 457 Wire Wire Line 458 3550 3000 3550 2500 459 Text GLabel 5200 2400 1 50 Input ~ 0 460 5V 461 Wire Wire Line 462 5200 2750 5200 2400 463 $Comp 464 L Device:C C? 465 U 1 1 61F22FD5 466 P 3750 2750 467 AR Path="/61F22FD5" Ref="C?" Part="1" 468 AR Path="/61F2273C/61F22FD5" Ref="A1" Part="1" 469 F 0 "A1" H 3865 2796 50 0000 L CNN 470 F 1 "A" H 3865 2705 50 0000 L CNN 471 F 2 "" H 3788 2600 50 0001 C CNN 472 F 3 "~" H 3750 2750 50 0001 C CNN 473 1 3750 2750 474 1 0 0 -1 475 $EndComp 476 Text GLabel 3550 5700 3 50 Input ~ 0 477 0V 478 Text GLabel 5300 5700 3 50 Input ~ 0 479 0V 480 Wire Wire Line 481 3550 5700 3550 4900 482 Wire Wire Line 483 3550 4900 4200 4900 484 Wire Wire Line 485 4200 4900 4200 3000 486 Wire Wire Line 487 4200 3000 3750 3000 488 Wire Wire Line 489 3750 3000 3750 2900 490 Connection ~ 3550 4900 491 Wire Wire Line 492 3550 4900 3550 4800 493 Wire Wire Line 494 3750 2600 3750 2500 495 Wire Wire Line 496 3750 2500 3550 2500 497 Connection ~ 3550 2500 498 Wire Wire Line 499 3550 2500 3550 2400 500 Wire Wire Line 501 5300 5700 5300 5400 502 Wire Wire Line 503 5300 5400 5500 5400 504 Wire Wire Line 505 5500 5400 5500 5300 506 Connection ~ 5300 5400 507 Wire Wire Line 508 5300 5400 5300 5300 509 Text GLabel 1600 2500 2 50 Input ~ 0 510 5V 511 Text GLabel 1600 2400 2 50 Input ~ 0 512 0V 513 Wire Wire Line 514 1300 2400 1600 2400 515 Wire Wire Line 516 1300 2500 1600 2500 517 Text GLabel 4300 5700 3 50 Input ~ 0 518 0V 519 Wire Wire Line 520 4300 5700 4300 5250 521 Text Label 4800 5200 1 50 ~ 0 522 Toshiba 523 Text Label 4300 5300 3 50 ~ 0 524 Hitachi 525 Wire Wire Line 526 1900 2200 1300 2200 527 Wire Wire Line 528 5700 1300 1900 1300 529 Wire Wire Line 530 1900 1300 1900 2200 531 Text GLabel 6000 4700 2 50 Input ~ 0 532 RDY 533 Wire Wire Line 534 5900 4200 6200 4200 535 Wire Wire Line 536 5900 4100 6800 4100 537 Wire Wire Line 538 5700 1300 7500 1300 539 Wire Bus Line 540 4000 6100 6700 6100 541 Wire Wire Line 542 5900 4700 6000 4700 543 Wire Wire Line 544 5900 3200 6600 3200 545 Wire Wire Line 546 5900 3300 6600 3300 547 Wire Wire Line 548 5900 3400 6600 3400 549 Wire Wire Line 550 5900 3500 6600 3500 551 Wire Wire Line 552 5900 3600 6600 3600 553 Wire Wire Line 554 5900 3700 6600 3700 555 Wire Wire Line 556 5900 3800 6600 3800 557 Wire Wire Line 558 5900 3900 6600 3900 559 Text GLabel 8650 3300 2 50 Input ~ 0 560 ~NMI 561 Text GLabel 6200 4200 2 50 Input ~ 0 562 ~IRQ 563 Text GLabel 6000 4300 2 50 Output ~ 0 564 RnW 565 Text GLabel 7700 5000 2 50 Input ~ 0 566 PHI_OUT 567 Text GLabel 6800 1500 2 50 Output ~ 0 568 A[0..15] 569 Text GLabel 6800 6100 2 50 BiDi ~ 0 570 D[0..7] 571 Wire Bus Line 572 6800 6100 6700 6100 573 Connection ~ 6700 6100 574 Text GLabel 6800 1100 2 50 Output ~ 0 575 KBD[0..3] 576 Wire Bus Line 577 6800 1100 2000 1100 578 Text GLabel 7500 1300 2 50 Output ~ 0 579 ~RST 580 Text GLabel 6800 1700 2 50 Input ~ 0 581 ROM 582 Text GLabel 7500 900 2 50 Output ~ 0 583 CAPS_LOCK 584 Text Notes 6800 3200 0 50 ~ 0 585 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 disable buffering via IC18 for ~NMI.\nLK9 is made to disable buffering via IC18 for PHI_OUT.\n\nThese buffers were introduced for the Aberdeen ULA,\nand are superfluous for the Ferranti ULA.\nSee the "Acorn Information - Volume 1" document.\n 586 $Comp 587 L 74xx:74LS08 IC18 588 U 4 1 61F0E37D 589 P 7200 4900 590 F 0 "IC18" H 7200 4583 50 0000 C CNN 591 F 1 "74LS08" H 7200 4674 50 0000 C CNN 592 F 2 "" H 7200 4900 50 0001 C CNN 593 F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 7200 4900 50 0001 C CNN 594 4 7200 4900 595 -1 0 0 1 596 $EndComp 597 Text GLabel 7700 4500 2 50 Input ~ 0 598 BUFFER_ENABLE 599 Wire Wire Line 600 7700 4500 7600 4500 601 Wire Wire Line 602 7700 5000 7600 5000 603 Wire Wire Line 604 5900 4900 6800 4900 605 $Comp 606 L Jumper:Jumper_2_Open LK9 607 U 1 1 61F22F77 608 P 7200 5400 609 F 0 "LK9" H 7200 5635 50 0000 C CNN 610 F 1 "Disable buffer" H 7200 5544 50 0000 C CNN 611 F 2 "" H 7200 5400 50 0001 C CNN 612 F 3 "~" H 7200 5400 50 0001 C CNN 613 1 7200 5400 614 1 0 0 -1 615 $EndComp 616 Wire Wire Line 617 7400 5400 7600 5400 618 Wire Wire Line 619 7600 5400 7600 5000 620 Connection ~ 7600 5000 621 Wire Wire Line 622 7600 5000 7500 5000 623 Wire Wire Line 624 7000 5400 6800 5400 625 Wire Wire Line 626 6800 5400 6800 4900 627 Connection ~ 6800 4900 628 Wire Wire Line 629 6800 4900 6900 4900 630 $Comp 631 L 74xx:74LS08 IC18 632 U 2 1 61F3624E 633 P 7200 4100 634 F 0 "IC18" H 7200 4425 50 0000 C CNN 635 F 1 "74LS08" H 7200 4334 50 0000 C CNN 636 F 2 "" H 7200 4100 50 0001 C CNN 637 F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 7200 4100 50 0001 C CNN 638 2 7200 4100 639 -1 0 0 -1 640 $EndComp 641 Text GLabel 8100 3600 2 50 Input ~ 0 642 5V 643 Wire Wire Line 644 7800 4000 7600 4000 645 Wire Wire Line 646 7600 4500 7600 4200 647 Wire Wire Line 648 7600 4200 7500 4200 649 Connection ~ 7600 4500 650 Wire Wire Line 651 7600 4500 7600 4800 652 Wire Wire Line 653 7600 4800 7500 4800 654 Wire Wire Line 655 7600 4000 7600 3600 656 Connection ~ 7600 4000 657 Wire Wire Line 658 7600 4000 7500 4000 659 $Comp 660 L Device:R R74 661 U 1 1 61F7EEAC 662 P 7850 3600 663 F 0 "R74" V 7643 3600 50 0000 C CNN 664 F 1 "4700R" V 7734 3600 50 0000 C CNN 665 F 2 "" V 7780 3600 50 0001 C CNN 666 F 3 "~" H 7850 3600 50 0001 C CNN 667 1 7850 3600 668 0 1 1 0 669 $EndComp 670 Wire Wire Line 671 7600 3600 7700 3600 672 Wire Wire Line 673 8000 3600 8100 3600 674 Wire Wire Line 675 6800 4100 6800 3300 676 Wire Wire Line 677 6800 3300 8500 3300 678 Wire Wire Line 679 8500 3300 8500 4000 680 Connection ~ 6800 4100 681 Wire Wire Line 682 6800 4100 6900 4100 683 $Comp 684 L 74xx:74LS08 IC18 685 U 5 1 61FA23D2 686 P 9300 3100 687 F 0 "IC18" H 9530 3146 50 0000 L CNN 688 F 1 "74LS08" H 9530 3055 50 0000 L CNN 689 F 2 "" H 9300 3100 50 0001 C CNN 690 F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 9300 3100 50 0001 C CNN 691 5 9300 3100 692 1 0 0 -1 693 $EndComp 694 Text GLabel 9300 2500 1 50 Input ~ 0 695 5V 696 Wire Wire Line 697 9300 2500 9300 2600 698 Text GLabel 9300 3700 3 50 Input ~ 0 699 0V 700 Wire Wire Line 701 9300 3700 9300 3600 702 Text Label 6700 1100 2 50 ~ 0 703 KBD[0..3] 704 Text Label 6700 1500 2 50 ~ 0 705 A[0..15] 706 Entry Wire Line 707 2000 3000 2100 2900 708 Entry Wire Line 709 2000 3100 2100 3000 710 Entry Wire Line 711 2000 3200 2100 3100 712 Entry Wire Line 713 2000 3300 2100 3200 714 Entry Wire Line 715 2000 3400 2100 3300 716 Entry Wire Line 717 2000 3500 2100 3400 718 Entry Wire Line 719 2000 3600 2100 3500 720 Entry Wire Line 721 2000 3700 2100 3600 722 Entry Wire Line 723 2000 3800 2100 3700 724 Entry Wire Line 725 2000 3900 2100 3800 726 Entry Wire Line 727 2000 4000 2100 3900 728 Entry Wire Line 729 2000 4100 2100 4000 730 Entry Wire Line 731 2000 4200 2100 4100 732 Entry Wire Line 733 2000 4300 2100 4200 734 Entry Bus Bus 735 2500 1600 2600 1500 736 Entry Bus Bus 737 2100 1600 2200 1500 738 Entry Bus Bus 739 4400 1600 4500 1500 740 Text Label 6600 6100 2 50 ~ 0 741 D[0..7] 742 $Comp 743 L Jumper:Jumper_2_Open LK8 744 U 1 1 622A19C1 745 P 8000 4000 746 F 0 "LK8" H 8000 4250 50 0000 C CNN 747 F 1 "Disable buffer" H 8000 4150 50 0000 C CNN 748 F 2 "" H 8000 4000 50 0001 C CNN 749 F 3 "~" H 8000 4000 50 0001 C CNN 750 1 8000 4000 751 -1 0 0 -1 752 $EndComp 753 Wire Wire Line 754 8650 3300 8500 3300 755 $Comp 756 L power:PWR_FLAG #FLG0108 757 U 1 1 62024ADF 758 P 4450 5000 759 F 0 "#FLG0108" H 4450 5075 50 0001 C CNN 760 F 1 "PWR_FLAG" H 4450 5174 50 0000 C CNN 761 F 2 "" H 4450 5000 50 0001 C CNN 762 F 3 "~" H 4450 5000 50 0001 C CNN 763 1 4450 5000 764 1 0 0 -1 765 $EndComp 766 Connection ~ 4450 5000 767 Wire Wire Line 768 4450 5000 4550 5000 769 Text Notes 4300 6450 0 50 ~ 0 770 Note that KiCad cannot determine whether ~CS\nis driven via LK1, so a power flag is required. 771 Connection ~ 8500 3300 772 Wire Wire Line 773 8200 4000 8500 4000 774 Wire Bus Line 775 2200 1500 6800 1500 776 Wire Bus Line 777 2000 1100 2000 2800 778 Wire Bus Line 779 6700 3300 6700 6100 780 Wire Bus Line 781 4000 3800 4000 6100 782 Wire Bus Line 783 2500 1600 2500 4500 784 Wire Bus Line 785 2100 1600 2100 4200 786 Wire Bus Line 787 4400 1600 4400 4500 788 $EndSCHEMATC