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 2100 2650 21 F 0 "IC4" H 2100 3225 50 0000 C CNN 22 F 1 "4164" H 2100 3134 50 0000 C CNN 23 F 2 "" H 2050 2650 50 0001 C CNN 24 F 3 "" H 2050 2650 50 0001 C CNN 25 1 2100 2650 26 1 0 0 -1 27 $EndComp 28 $Comp 29 L DRAM:4164 IC5 30 U 1 1 61D7F241 31 P 3900 2650 32 F 0 "IC5" H 3900 3225 50 0000 C CNN 33 F 1 "4164" H 3900 3134 50 0000 C CNN 34 F 2 "" H 3850 2650 50 0001 C CNN 35 F 3 "" H 3850 2650 50 0001 C CNN 36 1 3900 2650 37 1 0 0 -1 38 $EndComp 39 $Comp 40 L DRAM:4164 IC6 41 U 1 1 61D7F248 42 P 5700 2650 43 F 0 "IC6" H 5700 3225 50 0000 C CNN 44 F 1 "4164" H 5700 3134 50 0000 C CNN 45 F 2 "" H 5650 2650 50 0001 C CNN 46 F 3 "" H 5650 2650 50 0001 C CNN 47 1 5700 2650 48 1 0 0 -1 49 $EndComp 50 $Comp 51 L DRAM:4164 IC7 52 U 1 1 61D7F24F 53 P 7500 2650 54 F 0 "IC7" H 7500 3225 50 0000 C CNN 55 F 1 "4164" H 7500 3134 50 0000 C CNN 56 F 2 "" H 7450 2650 50 0001 C CNN 57 F 3 "" H 7450 2650 50 0001 C CNN 58 1 7500 2650 59 1 0 0 -1 60 $EndComp 61 Entry Wire Line 62 1500 2800 1600 2700 63 Entry Wire Line 64 1500 2900 1600 2800 65 Entry Wire Line 66 1500 3000 1600 2900 67 Connection ~ 3000 3500 68 Wire Bus Line 69 3000 3500 1500 3500 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 ~ 3300 3500 81 Wire Bus Line 82 3300 3500 3000 3500 83 Entry Wire Line 84 3300 2800 3400 2700 85 Entry Wire Line 86 3300 2900 3400 2800 87 Entry Wire Line 88 3300 3000 3400 2900 89 Entry Wire Line 90 4700 2600 4800 2700 91 Entry Wire Line 92 4700 2700 4800 2800 93 Entry Wire Line 94 4700 2800 4800 2900 95 Entry 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50 0001 C CNN 506 F 3 "" H 1400 5750 50 0001 C CNN 507 1 1350 5250 508 1 0 0 -1 509 $EndComp 510 Text GLabel 1350 3900 1 50 Input ~ 0 511 5V 512 Text GLabel 1350 6600 3 50 Input ~ 0 513 0V 514 Wire Wire Line 515 1350 3900 1350 4000 516 Wire Wire Line 517 1350 6600 1350 6500 518 Text GLabel 8900 5000 2 50 Input ~ 0 519 RA[0..7] 520 Wire Bus Line 521 8900 5000 2100 5000 522 Entry Wire Line 523 2000 5100 2100 5000 524 Entry Wire Line 525 2000 5200 2100 5100 526 Entry Wire Line 527 2000 5300 2100 5200 528 Entry Wire Line 529 2000 5400 2100 5300 530 Entry Wire Line 531 2000 5500 2100 5400 532 Entry Wire Line 533 2000 5600 2100 5500 534 Entry Wire Line 535 2000 5700 2100 5600 536 Entry Wire Line 537 2000 5800 2100 5700 538 Wire Wire Line 539 1700 5100 2000 5100 540 Wire Wire Line 541 1700 5200 2000 5200 542 Wire Wire Line 543 1700 5300 2000 5300 544 Wire Wire Line 545 1700 5400 2000 5400 546 Wire Wire Line 547 1700 5500 2000 5500 548 Wire Wire Line 549 1700 5600 2000 5600 550 Wire Wire Line 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