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 3 9 8 Title "" 9 Date "" 10 Rev "" 11 Comp "" 12 Comment1 "" 13 Comment2 "" 14 Comment3 "" 15 Comment4 "" 16 $EndDescr 17 $Comp 18 L DRAM:4164 IC4 19 U 1 1 61D7F23A 20 P 2350 2650 21 F 0 "IC4" H 2350 3225 50 0000 C CNN 22 F 1 "4164" H 2350 3134 50 0000 C CNN 23 F 2 "" H 2300 2650 50 0001 C CNN 24 F 3 "" H 2300 2650 50 0001 C CNN 25 1 2350 2650 26 1 0 0 -1 27 $EndComp 28 $Comp 29 L DRAM:4164 IC5 30 U 1 1 61D7F241 31 P 3750 2650 32 F 0 "IC5" H 3750 3225 50 0000 C CNN 33 F 1 "4164" H 3750 3134 50 0000 C CNN 34 F 2 "" H 3700 2650 50 0001 C CNN 35 F 3 "" H 3700 2650 50 0001 C CNN 36 1 3750 2650 37 1 0 0 -1 38 $EndComp 39 $Comp 40 L DRAM:4164 IC6 41 U 1 1 61D7F248 42 P 5150 2650 43 F 0 "IC6" H 5150 3225 50 0000 C CNN 44 F 1 "4164" H 5150 3134 50 0000 C CNN 45 F 2 "" H 5100 2650 50 0001 C CNN 46 F 3 "" H 5100 2650 50 0001 C CNN 47 1 5150 2650 48 1 0 0 -1 49 $EndComp 50 $Comp 51 L DRAM:4164 IC7 52 U 1 1 61D7F24F 53 P 6550 2650 54 F 0 "IC7" H 6550 3225 50 0000 C CNN 55 F 1 "4164" H 6550 3134 50 0000 C CNN 56 F 2 "" H 6500 2650 50 0001 C CNN 57 F 3 "" H 6500 2650 50 0001 C CNN 58 1 6550 2650 59 1 0 0 -1 60 $EndComp 61 Entry Wire Line 62 1800 2800 1900 2700 63 Entry Wire Line 64 1800 2900 1900 2800 65 Entry Wire Line 66 1800 3000 1900 2900 67 Connection ~ 3000 3300 68 Wire Bus Line 69 3000 3300 1800 3300 70 Entry Wire Line 71 2900 2600 3000 2700 72 Entry Wire Line 73 2900 2700 3000 2800 74 Entry Wire Line 75 2900 2800 3000 2900 76 Entry Wire Line 77 2900 2900 3000 3000 78 Entry Wire Line 79 2900 3000 3000 3100 80 Connection ~ 3200 3300 81 Wire Bus Line 82 3200 3300 3000 3300 83 Entry Wire Line 84 3200 2800 3300 2700 85 Entry Wire Line 86 3200 2900 3300 2800 87 Entry Wire Line 88 3200 3000 3300 2900 89 Entry Wire Line 90 4300 2600 4400 2700 91 Entry Wire Line 92 4300 2700 4400 2800 93 Entry Wire Line 94 4300 2800 4400 2900 95 Entry Wire Line 96 4300 2900 4400 3000 97 Entry Wire Line 98 4300 3000 4400 3100 99 Entry Wire Line 100 4600 2800 4700 2700 101 Entry Wire Line 102 4600 2900 4700 2800 103 Entry Wire Line 104 4600 3000 4700 2900 105 Entry Wire Line 106 5700 2600 5800 2700 107 Entry Wire Line 108 5700 2700 5800 2800 109 Entry Wire Line 110 5700 2800 5800 2900 111 Entry Wire Line 112 5700 2900 5800 3000 113 Entry Wire Line 114 5700 3000 5800 3100 115 Entry Wire Line 116 6000 2800 6100 2700 117 Entry Wire Line 118 6000 2900 6100 2800 119 Entry Wire Line 120 6000 3000 6100 2900 121 Entry Wire Line 122 7100 2600 7200 2700 123 Entry Wire Line 124 7100 2700 7200 2800 125 Entry Wire Line 126 7100 2800 7200 2900 127 Entry Wire Line 128 7100 2900 7200 3000 129 Entry Wire Line 130 7100 3000 7200 3100 131 Wire Wire Line 132 6900 2600 7100 2600 133 Wire Wire Line 134 6900 2700 7100 2700 135 Wire Wire Line 136 6900 2800 7100 2800 137 Wire Wire Line 138 6900 2900 7100 2900 139 Wire Wire Line 140 6900 3000 7100 3000 141 Wire Wire Line 142 6100 2700 6200 2700 143 Wire Wire Line 144 6100 2800 6200 2800 145 Wire Wire Line 146 6100 2900 6200 2900 147 Wire Wire Line 148 1900 2700 2000 2700 149 Wire Wire Line 150 1900 2800 2000 2800 151 Wire Wire Line 152 1900 2900 2000 2900 153 Wire Wire Line 154 2700 2600 2900 2600 155 Wire Wire Line 156 2700 2700 2900 2700 157 Wire Wire Line 158 2700 2800 2900 2800 159 Wire Wire Line 160 2700 2900 2900 2900 161 Wire Wire Line 162 2700 3000 2900 3000 163 Wire Wire Line 164 3300 2700 3400 2700 165 Wire Wire Line 166 3300 2800 3400 2800 167 Wire Wire Line 168 3300 2900 3400 2900 169 Wire Wire Line 170 4100 2600 4300 2600 171 Wire Wire Line 172 4100 2700 4300 2700 173 Wire Wire Line 174 4100 2800 4300 2800 175 Wire Wire Line 176 4100 2900 4300 2900 177 Wire Wire Line 178 4100 3000 4300 3000 179 Wire Wire Line 180 4700 2700 4800 2700 181 Wire Wire Line 182 4700 2800 4800 2800 183 Wire Wire Line 184 4700 2900 4800 2900 185 Wire Wire Line 186 5500 2600 5700 2600 187 Wire Wire Line 188 5500 2700 5700 2700 189 Wire Wire Line 190 5500 2800 5700 2800 191 Wire Wire Line 192 5500 2900 5700 2900 193 Wire Wire Line 194 5500 3000 5700 3000 195 Text Label 6900 2600 0 50 ~ 0 196 A6 197 Text Label 6900 2700 0 50 ~ 0 198 A3 199 Text Label 6900 2800 0 50 ~ 0 200 A4 201 Text Label 6900 2900 0 50 ~ 0 202 A5 203 Text Label 6900 3000 0 50 ~ 0 204 A7 205 Text Label 6200 2700 2 50 ~ 0 206 A0 207 Text Label 6200 2800 2 50 ~ 0 208 A2 209 Text Label 6200 2900 2 50 ~ 0 210 A1 211 Text Label 5500 2600 0 50 ~ 0 212 A6 213 Text Label 4100 2600 0 50 ~ 0 214 A6 215 Text Label 2700 2600 0 50 ~ 0 216 A6 217 Text Label 5500 2700 0 50 ~ 0 218 A3 219 Text Label 4100 2700 0 50 ~ 0 220 A3 221 Text Label 2700 2700 0 50 ~ 0 222 A3 223 Text Label 5500 2800 0 50 ~ 0 224 A4 225 Text Label 4100 2800 0 50 ~ 0 226 A4 227 Text Label 2700 2800 0 50 ~ 0 228 A4 229 Text Label 5500 2900 0 50 ~ 0 230 A5 231 Text Label 4100 2900 0 50 ~ 0 232 A5 233 Text Label 2700 2900 0 50 ~ 0 234 A5 235 Text Label 5500 3000 0 50 ~ 0 236 A7 237 Text Label 4100 3000 0 50 ~ 0 238 A7 239 Text Label 2700 3000 0 50 ~ 0 240 A7 241 Text Label 4800 2700 2 50 ~ 0 242 A0 243 Text Label 4800 2800 2 50 ~ 0 244 A2 245 Text Label 4800 2900 2 50 ~ 0 246 A1 247 Text Label 3400 2700 2 50 ~ 0 248 A0 249 Text Label 2000 2700 2 50 ~ 0 250 A0 251 Text Label 3400 2800 2 50 ~ 0 252 A2 253 Text Label 2000 2800 2 50 ~ 0 254 A2 255 Text Label 3400 2900 2 50 ~ 0 256 A1 257 Text Label 2000 2900 2 50 ~ 0 258 A1 259 Wire Wire Line 260 2700 2400 2900 2400 261 Wire Wire Line 262 4100 2400 4300 2400 263 Wire Wire Line 264 4500 2500 4800 2500 265 Wire Wire Line 266 4550 2600 4800 2600 267 Wire Wire Line 268 5500 2400 5700 2400 269 Wire Wire Line 270 5900 2500 6200 2500 271 Wire Wire Line 272 5950 2600 6200 2600 273 Wire Wire Line 274 6900 2400 7100 2400 275 Text Label 6200 2600 2 50 ~ 0 276 ~RAS 277 Text Label 4800 2600 2 50 ~ 0 278 ~RAS 279 Text Label 3400 2600 2 50 ~ 0 280 ~RAS 281 Text Label 2000 2600 2 50 ~ 0 282 ~RAS 283 Text Label 6200 2500 2 50 ~ 0 284 ~WE 285 Text Label 4800 2500 2 50 ~ 0 286 ~WE 287 Text Label 3400 2500 2 50 ~ 0 288 ~WE 289 Text Label 2000 2500 2 50 ~ 0 290 ~WE 291 Text Label 6900 2400 0 50 ~ 0 292 ~CAS 293 Text Label 5500 2400 0 50 ~ 0 294 ~CAS 295 Text Label 4100 2400 0 50 ~ 0 296 ~CAS 297 Text Label 2700 2400 0 50 ~ 0 298 ~CAS 299 Wire Wire Line 300 6000 2400 5900 2300 301 Wire Wire Line 302 5900 2300 5900 1700 303 Wire Wire Line 304 7200 2400 7200 1700 305 Wire Wire Line 306 7100 2500 7200 2400 307 Wire Wire Line 308 6900 2500 7100 2500 309 Wire Wire Line 310 5700 2500 5800 2400 311 Wire Wire Line 312 5800 2400 5800 1700 313 Wire Wire Line 314 5500 2500 5700 2500 315 Wire Wire Line 316 4300 2500 4400 2400 317 Wire Wire Line 318 4400 2400 4400 1700 319 Wire Wire Line 320 4300 2500 4100 2500 321 Wire Wire Line 322 2900 2500 3000 2400 323 Wire Wire Line 324 3000 2400 3000 1700 325 Wire Wire Line 326 2900 2500 2700 2500 327 Wire Wire Line 328 4500 2300 4600 2400 329 Wire Wire Line 330 4500 1700 4500 2300 331 Wire Wire Line 332 1700 2300 1800 2400 333 Wire Wire Line 334 1700 1700 1700 2300 335 Wire Wire Line 336 3100 2300 3200 2400 337 Wire Wire Line 338 3100 1700 3100 2300 339 Connection ~ 7200 3300 340 Text Label 6900 2500 0 50 ~ 0 341 RAM3 342 Connection ~ 6000 3300 343 Wire Bus Line 344 6000 3300 7200 3300 345 Connection ~ 4600 3300 346 Connection ~ 5800 3300 347 Wire Bus Line 348 5800 3300 6000 3300 349 Wire Bus Line 350 4600 3300 5800 3300 351 Connection ~ 4400 3300 352 Wire Bus Line 353 4400 3300 4600 3300 354 Wire Bus Line 355 3200 3300 4400 3300 356 Text Label 5500 2500 0 50 ~ 0 357 RAM2 358 Text Label 4100 2500 0 50 ~ 0 359 RAM1 360 Text Label 2700 2500 0 50 ~ 0 361 RAM0 362 Text Label 6200 2400 2 50 ~ 0 363 RAM3 364 Text Label 4800 2400 2 50 ~ 0 365 RAM2 366 Text Label 3400 2400 2 50 ~ 0 367 RAM1 368 Text Label 2000 2400 2 50 ~ 0 369 RAM0 370 Wire Wire Line 371 6000 2400 6200 2400 372 Wire Wire Line 373 4600 2400 4800 2400 374 Wire Wire Line 375 3200 2400 3400 2400 376 Wire Wire Line 377 1800 2400 2000 2400 378 Entry Wire Line 379 7100 1600 7200 1700 380 Entry Wire Line 381 5800 1600 5900 1700 382 Entry Wire Line 383 5700 1600 5800 1700 384 Entry Wire Line 385 4400 1600 4500 1700 386 Entry Wire Line 387 4300 1600 4400 1700 388 Entry Wire Line 389 3000 1600 3100 1700 390 Entry Wire Line 391 2900 1600 3000 1700 392 Entry Wire Line 393 1600 1600 1700 1700 394 Text GLabel 1000 1200 1 50 Input ~ 0 395 5V 396 Wire Wire Line 397 1000 1200 1000 3100 398 Wire Wire Line 399 6100 3100 6100 3000 400 Wire Wire Line 401 6100 3000 6200 3000 402 Wire Wire Line 403 4700 3100 4700 3000 404 Wire Wire Line 405 4700 3000 4800 3000 406 Connection ~ 4700 3100 407 Wire Wire Line 408 3300 3100 3300 3000 409 Wire Wire Line 410 3300 3000 3400 3000 411 Connection ~ 3300 3100 412 Wire Wire Line 413 1900 3100 1900 3000 414 Wire Wire Line 415 1900 3000 2000 3000 416 Wire Wire Line 417 1000 3100 1900 3100 418 Connection ~ 1900 3100 419 Text GLabel 1600 1200 1 50 Input ~ 0 420 0V 421 Wire Wire Line 422 1600 1200 1600 1400 423 Wire Wire Line 424 1600 1400 2800 1400 425 Wire Wire Line 426 7000 1400 7000 2300 427 Wire Wire Line 428 7000 2300 6900 2300 429 Wire Wire Line 430 5500 2300 5600 2300 431 Wire Wire Line 432 5600 2300 5600 1400 433 Connection ~ 5600 1400 434 Wire Wire Line 435 5600 1400 7000 1400 436 Wire Wire Line 437 4100 2300 4200 2300 438 Wire Wire Line 439 4200 2300 4200 1400 440 Connection ~ 4200 1400 441 Wire Wire Line 442 4200 1400 5600 1400 443 Wire Wire Line 444 2700 2300 2800 2300 445 Wire Wire Line 446 2800 2300 2800 1400 447 Connection ~ 2800 1400 448 Wire Wire Line 449 2800 1400 4200 1400 450 Wire Bus Line 451 7200 3300 7700 3300 452 Text GLabel 7700 1600 2 50 BiDi ~ 0 453 RAM[0..3] 454 Text GLabel 7700 3300 2 50 Input ~ 0 455 RA[0..7] 456 Text Label 7600 3300 2 50 ~ 0 457 A[0..7] 458 Text GLabel 7700 3700 2 50 Input ~ 0 459 ~WE 460 Text GLabel 7700 3500 2 50 Input ~ 0 461 ~RAS 462 Wire Wire Line 463 1700 2500 2000 2500 464 Text GLabel 7700 1900 2 50 Input ~ 0 465 ~CAS 466 Wire Wire Line 467 1700 3700 3100 3700 468 Wire Wire Line 469 1700 3700 1700 2500 470 Wire Wire Line 471 3400 2500 3100 2500 472 Wire Wire Line 473 3100 2500 3100 3700 474 Connection ~ 3100 3700 475 Wire Wire Line 476 3100 3700 4500 3700 477 Wire Wire Line 478 4500 2500 4500 3700 479 Connection ~ 4500 3700 480 Wire Wire Line 481 4500 3700 5900 3700 482 Wire Wire Line 483 5900 2500 5900 3700 484 Connection ~ 5900 3700 485 Wire Wire Line 486 5900 3700 7700 3700 487 Wire Wire Line 488 5950 2600 5950 3500 489 Wire Wire Line 490 5950 3500 7700 3500 491 Wire Wire Line 492 4550 2600 4550 3500 493 Wire Wire Line 494 4550 3500 5950 3500 495 Connection ~ 5950 3500 496 Wire Wire Line 497 3400 2600 3150 2600 498 Wire Wire Line 499 3150 2600 3150 3500 500 Wire Wire Line 501 3150 3500 4550 3500 502 Connection ~ 4550 3500 503 Wire Wire Line 504 2000 2600 1750 2600 505 Wire Wire Line 506 1750 2600 1750 3500 507 Wire Wire Line 508 1750 3500 3150 3500 509 Connection ~ 3150 3500 510 Wire Wire Line 511 7100 2400 7100 1900 512 Wire Wire Line 513 7100 1900 7700 1900 514 Wire Wire Line 515 5700 2400 5700 1900 516 Wire Wire Line 517 5700 1900 7100 1900 518 Connection ~ 7100 1900 519 Wire Wire Line 520 4300 2400 4300 1900 521 Wire Wire Line 522 4300 1900 5700 1900 523 Connection ~ 5700 1900 524 Wire Wire Line 525 2900 2400 2900 1900 526 Wire Wire Line 527 2900 1900 4300 1900 528 Connection ~ 4300 1900 529 $Comp 530 L DRAM:TM4164EA4 IC20 531 U 1 1 623B101C 532 P 1350 5250 533 AR Path="/623B101C" Ref="IC20" Part="1" 534 AR Path="/61D7EEE8/623B101C" Ref="IC20" Part="1" 535 F 0 "IC20" H 1072 5296 50 0000 R CNN 536 F 1 "TM4164EA4" H 1072 5205 50 0000 R CNN 537 F 2 "" H 1400 5750 50 0001 C CNN 538 F 3 "" H 1400 5750 50 0001 C CNN 539 1 1350 5250 540 1 0 0 -1 541 $EndComp 542 Text GLabel 1350 3900 1 50 Input ~ 0 543 5V 544 Text GLabel 1350 6600 3 50 Input ~ 0 545 0V 546 Wire Wire Line 547 1350 3900 1350 4000 548 Wire Wire Line 549 1350 6600 1350 6500 550 Text GLabel 7700 5000 2 50 Input ~ 0 551 RA[0..7] 552 Wire Bus Line 553 7700 5000 2100 5000 554 Entry Wire Line 555 2000 5100 2100 5000 556 Entry Wire Line 557 2000 5200 2100 5100 558 Entry Wire Line 559 2000 5300 2100 5200 560 Entry Wire Line 561 2000 5400 2100 5300 562 Entry Wire Line 563 2000 5500 2100 5400 564 Entry Wire Line 565 2000 5600 2100 5500 566 Entry Wire Line 567 2000 5700 2100 5600 568 Entry Wire Line 569 2000 5800 2100 5700 570 Wire Wire Line 571 1700 5100 2000 5100 572 Wire Wire Line 573 1700 5200 2000 5200 574 Wire Wire Line 575 1700 5300 2000 5300 576 Wire Wire Line 577 1700 5400 2000 5400 578 Wire Wire Line 579 1700 5500 2000 5500 580 Wire Wire Line 581 1700 5600 2000 5600 582 Wire Wire Line 583 1700 5700 2000 5700 584 Wire Wire Line 585 1700 5800 2000 5800 586 NoConn ~ 1700 5900 587 Text Label 1750 5100 0 50 ~ 0 588 A0 589 Text Label 1750 5200 0 50 ~ 0 590 A1 591 Text Label 1750 5300 0 50 ~ 0 592 A2 593 Text Label 1750 5400 0 50 ~ 0 594 A3 595 Text Label 1750 5500 0 50 ~ 0 596 A4 597 Text Label 1750 5600 0 50 ~ 0 598 A5 599 Text Label 1750 5700 0 50 ~ 0 600 A6 601 Text Label 1750 5800 0 50 ~ 0 602 A7 603 Text GLabel 7700 4100 2 50 BiDi ~ 0 604 RAM[0..3] 605 Wire Bus Line 606 7700 4100 2100 4100 607 Entry Wire Line 608 2000 4200 2100 4100 609 Entry Wire Line 610 2000 4300 2100 4200 611 Entry Wire Line 612 2000 4400 2100 4300 613 Entry Wire Line 614 2000 4500 2100 4400 615 Entry Wire Line 616 2000 4600 2100 4500 617 Entry Wire Line 618 2000 4700 2100 4600 619 Entry Wire Line 620 2000 4800 2100 4700 621 Entry Wire Line 622 2000 4900 2100 4800 623 Wire Wire Line 624 1700 4200 2000 4200 625 Wire Wire Line 626 1700 4300 2000 4300 627 Wire Wire Line 628 1700 4400 2000 4400 629 Wire Wire Line 630 1700 4500 2000 4500 631 Wire Wire Line 632 1700 4600 2000 4600 633 Wire Wire Line 634 1700 4700 2000 4700 635 Wire Wire Line 636 1700 4800 2000 4800 637 Wire Wire Line 638 1700 4900 2000 4900 639 Text Label 1750 4200 0 50 ~ 0 640 RAM0 641 Text Label 1750 4400 0 50 ~ 0 642 RAM1 643 Text Label 1750 4600 0 50 ~ 0 644 RAM2 645 Text Label 1750 4800 0 50 ~ 0 646 RAM3 647 Text Label 1750 4300 0 50 ~ 0 648 RAM0 649 Text Label 1750 4500 0 50 ~ 0 650 RAM1 651 Text Label 1750 4700 0 50 ~ 0 652 RAM2 653 Text Label 1750 4900 0 50 ~ 0 654 RAM3 655 Text Label 7600 5000 2 50 ~ 0 656 A[0..7] 657 Text GLabel 7700 6100 2 50 Input ~ 0 658 ~CAS 659 Text GLabel 8000 6200 2 50 Input ~ 0 660 ~RAS 661 Text GLabel 7700 6300 2 50 Input ~ 0 662 ~WE 663 Wire Wire Line 664 7700 6100 1700 6100 665 Wire Wire Line 666 1700 6200 8000 6200 667 Wire Wire Line 668 1700 6300 7700 6300 669 Text Notes 2100 4000 0 50 ~ 0 670 Alternative DRAM single-in-line package 671 Wire Wire Line 672 1900 3100 3300 3100 673 Wire Wire Line 674 3300 3100 4700 3100 675 Wire Wire Line 676 4700 3100 6100 3100 677 Wire Bus Line 678 1800 2800 1800 3300 679 Wire Bus Line 680 3200 2800 3200 3300 681 Wire Bus Line 682 4600 2800 4600 3300 683 Wire Bus Line 684 6000 2800 6000 3300 685 Wire Bus Line 686 5800 2700 5800 3300 687 Wire Bus Line 688 7200 2700 7200 3300 689 Wire Bus Line 690 4400 2700 4400 3300 691 Wire Bus Line 692 3000 2700 3000 3300 693 Wire Bus Line 694 2100 5000 2100 5700 695 Wire Bus Line 696 2100 4100 2100 4800 697 Wire Bus Line 698 1600 1600 7700 1600 699 $EndSCHEMATC