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4 layers223.5 × 129.8 mmClassicIIReloaded, the printed circuit board in 3D

ClassicIIReloaded

btb/ClassicII16

Reproduction of Macintosh Classic II

Full screenGitHub.kicad_pcb
Size
223.5 × 129.8 mm
Copper layers
4
Thickness
1.6 mm
Parts
416
Nets
440
Pads
1,962
Tracks, vias
10,444, 1,255
Pours
41
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
25 May 2025
Updated
12 Oct 2026

Overview

ClassicIIReloaded is an open-source printed circuit board by btb, from the btb/ClassicII repository on GitHub. It is a 4-layer board of 223.5 × 129.8 mm with 416 parts on 440 nets, routed with 10,444 tracks and 1,255 vias.

It is built around the 74LS245SC, AM26LS30JC and AM26LV32ID. Its parts include 113 capacitors, 97 resistors, 15 ICs, 11 inductors and 3 connectors.

Main components

3

README

ClassicIIReloaded/README.md

Classic II Reloaded

Rendering of Classic II Reloaded logic board

Started with my reverse-engineered later-revision Classic II, and made some changes for convenience:

  • Can use ROM chips from the earlier or later revisions.
  • Should be able to use more "modern" 12mm right-angle pushbuttons.
  • Can use a 2032 battery.
  • Late revision jumper block made no sense, use separate jumpers like the earlier revision.
  • Electrolytic capacitor pads wide enough to safely accomodate tantalum capacitors.

Parts

416
QtyValueFootprintReferences
79~MyPackage:TestPoint_THTPad_D1.0mm_Drill0.5mmTP1, TP10, TP11, TP100, TP101, TP109, TP110, TP111, TP112, TP113, TP114, TP115, TP116, TP117, TP118, TP119 +63
45100nFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC28, C38, C42, C44, C45, C46, C47, C49, C100, C101, C104, C109, C110, C111, C112, C113 +29
36~MyPackage:TestPoint_Pad_D1.0mmTP13, TP14, TP15, TP17, TP135, TP136, TP149, TP150, TP152, TP157, TP158, TP160, TP161, TP162, TP163, TP165 +20
314.7KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR2, R13, R16, R18, R36, R38, R41, R43, R45, R47, R50, R51, R53, R54, R57, R59 +15
2222RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR4, R12, R20, R52, R56, R58, R61, R62, R63, R67, R68, R73, R74, R75, R78, R79 +6
1510nFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC23, C27, C31, C34, C37, C50, C64, C88, C95, C96, C102, C103, C105, C107, C114
13560pFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC1, C2, C16, C17, C18, C19, C20, C22, C24, C25, C26, C29, C30
1210uF 16VMyPackage:CP_Elec_4x5.8_largepadsC5, C6, C7, C8, C10, C11, C12, C14, C21, C74, C79, C106
11FerriteMyPackage:L_2010_5025Metric_Pad2.0x2.2mm_HandSolderL1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11
6NetTie_2MyPackage:NetTie-2_THT_Pad0.43mmNT1, NT2, NT3, NT4, NT5, NT6
53.3uF 16VMyPackage:CP_EIA-3528-21_Kemet-B_Pad3.0x2.35mm_HandSolderC36, C48, C76, C84, C93
547RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR10, R11, R21, R49, R76
41Mx4MyPackage:SOJ-26-20_7.62x17.145mm_P1.27mmU13, U14, U17, U19
41nFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC32, C33, C40, C54
427C010-080MyPackage:DIP-32_W15.24mm_Socket_SmallPadsU22, U23, U24, U25
4FiducialFiducial:Fiducial_1mm_Mask3mmFD2, FD3, FD4, FD5
4MountingHoleMyPackage:MountingHole_3.2mm_M3_ISO14580ZH1, ZH2, ZH3, ZH4
3220RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR17, R33, R86
347uF 16VMyPackage:CP_Elec_6.3x5.4_largepadsC3, C4, C13
21.6KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR7, R15
2100KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR26, R95
2100pFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC35, C115
210MMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR48, R55
219.1K 1%MyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR42, R46
21AMyPackage:Fuse_2512_6332Metric_Pad2.54x2.54mm_HandSolderF1, F2
21KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR19, R44
21uF 50VMyPackage:CP_Elec_4x5.8_largepadsC9, C15
2200KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR5, R34
225R 150pFMyPackage:SOIC-20W_7.5x12.8mm_P1.27mm_RCRC1, RC2
227C322MyPackage:DIP-42_W15.24mm_Socket_SmallPadsZZU22, ZZU23
227C400MyPackage:DIP-40_W15.24mm_Socket_SmallPadsZU22, ZU23
227KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR29, R40
233RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR71, R72
24.7nFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC72, C108
274LS245MyPackage:SOIC-20W_7.5x12.8mm_P1.27mm_ovalU20, U21
2820RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR32, R35
2AM26LS30MyPackage:PLCC-20_roundedU6, U7
2AM26LV32MyPackage:SOIC-16_4.55x10.3mm_P1.27mm_ovalU3, U5
2FerriteMyPackage:L_Pack03_P2.54mmLP1, LP3
2FiducialMyPackage:Fiducial_1mm_Mask3mm_squareFD1, FD6
10RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR97
11 MBytes PROMConnector_Mine:PinHeader_1x02_P2.54mm_VerticalJ16
11.2KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR85
11.5nFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC69
1100RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR83
110K 1%MyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR96
110pFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC66
111.3K 1%MyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR31
116KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR37
1180RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR14
11N5817MyPackage:D_SMAD3
12/2 MBytesConnector_Mine:PinHeader_1x02_P2.54mm_VerticalJ13
12032MyPackage:BatteryHolder_Keystone_103_1x20mmZBT1
1220pFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC39
123.2K 1%MyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR25
125R 150pFMyPackage:SOIC-20W_7.5x12.8mm_P1.27mm_ovalRC3
12N3904MyPackage:SOT-23_HandsolderingQ1
13.3KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR1
13.3uF 16VMyPackage:CP_EIA-3528-12_Kemet-T_Pad1.98x2.35mm_HandSolderC71
13.9nFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC41
1300pFMyPackage:SMD_1206_3216Metric_Pad1.65x1.27mm_largepadsC61
131.3344MHzMyPackage:Oscillator_DIP-14G1
131.3344MHzMyPackage:Oscillator_SMD_Abracon_ABLNOZG1
132.768KCrystal:Crystal_AT310_D3.0mm_L10.0mm_VerticalY1
1330KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR39
133pFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC70
134.8K 1%MyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR22
139RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR23
13VMyPackage:BatteryHolder_Keystone_108_1_2xAABT1
1470RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR3
1470pFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC52
1512K PROMConnector_Mine:PinHeader_1x02_P2.54mm_VerticalJ14
16.2KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR28
16.8KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR27
160.4K 1%MyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR30
168030MyPackage:PQFP-132_24x24mm_P0.635mm_altU16
1680RMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR8
1680pFMyPackage:SMD_1206_3216Metric_Pad1.65x1.27mm_largepadsC97
168pFMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmC90
175KMyPackage:SMD_0805_2012Metric_Pad1.25x1.65mmR24

The 388 most common of 416 parts.

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Questions

How big is the ClassicIIReloaded PCB?

It measures 223.5 × 129.8 mm and has 4 copper layers, 1.6 mm thick.

What parts does the ClassicIIReloaded use?

416 parts, built around the 74LS245SC, AM26LS30JC and AM26LV32ID. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the ClassicIIReloaded KiCad files?

From the btb/ClassicII repository on GitHub, at the commit this page was made from: the board is ClassicIIReloaded/ClassicIIReloaded.kicad_pcb and its schematic ClassicIIReloaded/ClassicIIReloaded.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the ClassicIIReloaded design in my own project?

Its repository states no licence, so its author keeps all rights: ask btb before reusing the design.