Apple-II-R0
About the Apple-II-R0 PCB
Apple-II-R0 is an open source PCB design by reifsnyderb, published on GitHub. It is a 2-layer board measuring 215.5 × 361.2 mm, with 189 components from 85 distinct parts.
Other key parts include the 74LS00, 74LS166, 2513 Char ROM, Keyboard_Connector and 74LS257. By type, the board carries 25 resistors, 15 connectors, 14 diodes, 14 capacitors, 7 modules and 5 fuses.
From the project
Schematic for Apple II System Board Revision 0
This schematic was taken from the BitPreserve project and compared to the Apple II Gerbers by Mike Willegal (http://www.willegal.net/appleii/appleii-first_page.htm). When necessary, The Apple II Circuit Description by Winston D. Gayler was consulted.
The PCB layout is a reworking of the Gerbers by Mike Willegal in KiCad. Where components are unobtainable from regular suppliers, substitutes have been used with part number references.
Main components on the Apple-II-R0
Apple-II-R0 bill of materials (BOM)
189 components, 85 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS00 | DIP-14_W7.62mm | A2 |
| 1 | 74LS166 | DIP-16_W7.62mm | A3 |
| 1 | 2513 Char ROM | DIP-24_W15.24mm | A5 |
| 1 | Keyboard_Connector | DIP-16_W7.62mm_Socket_LongPads | A7 |
| 1 | 74LS257 | DIP-16_W7.62mm | A8 |
| 1 | 74LS151 | DIP-16_W7.62mm | A9 |
| 1 | 74LS194 | DIP-16_W7.62mm | A10 |
| 2 | 2N4258 | TO-18-3 | Q1, Q2 |
| 1 | 2N3904 Central Semiconductor Corp | TO-92 | Q3 |
| 1 | MPSA13 | TO-92 | Q4 |
| 1 | XT0001 | Crystal_HC18-U_Vertical | Y1 |
| 1 | Cassette Data In | AUDIO_mono | J0 |
| 1 | 74LS257 | DIP-16_W7.62mm | J1 |
| 1 | Cassette Data Out | AUDIO_mono | J2 |
| 1 | Conn_01x16 | Keyboard Connector 16 Pin | J3 |
| 1 | 74LS74 | DIP-14_W7.62mm | J13 |
| 1 | GAME_IO_Conn | DIP-16_W7.62mm_Socket_LongPads | J14 |
| 1 | Aux Video | PinHeader_1x04_P2.54mm_Vertical | J18 |
| 8 | 50 pin slot | Standard_Edge_Connector | SLOT0, SLOT1, SLOT2, SLOT3, SLOT4, SLOT5, SLOT6, SLOT7 |
| 1 | 74LS175 | DIP-16_W7.62mm | B1 |
Show 65 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS86 | DIP-14_W7.62mm | B2 |
| 1 | NE555P 555 Texas Instruments | DIP-8_W7.62mm | B3 |
| 2 | 74LS194 | DIP-16_W7.62mm | B4, B9 |
| 2 | 74LS174 | DIP-16_W7.62mm | B5, B8 |
| 2 | 74LS257 | DIP-16_W7.62mm | B6, B7 |
| 1 | 74LS74 | DIP-14_W7.62mm | B10 |
| 1 | 74LS08 | DIP-14_W7.62mm | B11 |
| 1 | 74LS11 | DIP-14_W7.62mm | B12 |
| 1 | 74LS02 | DIP-14_W7.62mm | B13 |
| 1 | Power Connector | POWER | CP0 |
| 1 | 1N914 | D_DO-15_P10.16mm_Horizontal | CR1 |
| 1 | 5-50pF | COLOUR_TRIM | CT3 |
| 40 | 0.1uF | C_Disc_D5.0mm_W2.5mm_P5.00mm | Cap1, Cap3, Cap4, Cap13, Cap14, Cap15, Cap16, Cap17 +32 |
| 1 | 47pf | C_Disc_D7.0mm_W2.5mm_P5.00mm | Cap2 |
| 4 | .022uF | C_Disc_D5.0mm_W2.5mm_P5.00mm | Cap5, Cap6, Cap7, Cap8 |
| 4 | .1uF | C_Disc_D5.0mm_W2.5mm_P5.00mm | Cap9, Cap10, Cap11, Cap12 |
| 1 | Memory Type Sel | DIP-14_W7.62mm | E1 |
| 1 | 74LS139 | DIP-16_W7.62mm | E2 |
| 8 | 4116 | DIP-16_W7.62mm | E3, E4, E5, E6, E7, E8, E9, E10 |
| 3 | 74LS153 | DIP-16_W7.62mm | E11, E12, E13 |
| 1 | 74LS283 | DIP-16_W7.62mm | E14 |
| 1 | Memory Type Sel | DIP-14_W7.62mm | F1 |
| 1 | 74LS139 | DIP-16_W7.62mm | F2 |
| 2 | 74LS138 | DIP-16_W7.62mm | F12, F13 |
| 1 | 74LS259 | DIP-16_W7.62mm | F14 |
| 1 | 74LS08 | DIP-14_W7.62mm | H1 |
| 2 | 74LS138 | DIP-16_W7.62mm | H2, H12 |
| 3 | 8T97 | DIP-16_W7.62mm | H3, H4, H5 |
| 1 | 6502 | DIP-40_W15.24mm | H7 |
| 2 | 8T28 | DIP-16_W7.62mm | H10, H11 |
| 1 | NE558 | DIP-16_W7.62mm | H13 |
| 1 | 74LS251 | DIP-16_W7.62mm | H14 |
| 1 | Jumper | User-1 | JP-User1 |
| 1 | MA741 | DIP-8_W7.62mm | K13 |
| 1 | RCA Connector | VIDEO | K14 |
| 3 | 1k | R_Array_SIP8 | RA01, RA02, RA03 |
| 6 | ROM_Chip | DIP-24_W15.24mm | ROM-D0, ROM-D8, ROM-E0, ROM-E8, ROM-F0, ROM-F8 |
| 1 | 22-23-2021 Speaker Connector Molex | PinHeader_1x02_P2.54mm_Vertical | SPKR1 |
| 1 | Memory Type Sel | DIP-14_W7.62mm | D1 |
| 1 | 74LS20 | DIP-14_W7.62mm | D2 |
| 8 | 4116 | DIP-16_W7.62mm | D3, D4, D5, D6, D7, D8, D9, D10 |
| 4 | 74LS161 | DIP-16_W7.62mm | D11, D12, D13, D14 |
| 1 | 27uH | L_Axial_L7.0mm_D3.3mm_P12.70mm_Horizontal_Fastron_MICC | L1 |
| 1 | 74LS153 | DIP-16_W7.62mm | C1 |
| 1 | 74LS195 | DIP-16_W7.62mm | C2 |
| 8 | 4116 | DIP-16_W7.62mm | C3, C4, C5, C6, C7, C8, C9, C10 |
| 1 | 74LS04 | DIP-14_W7.62mm | C11 |
| 1 | 74LS257 | DIP-16_W7.62mm | C12 |
| 1 | 74LS51 | DIP-14_W7.62mm | C13 |
| 1 | 74LS32 | DIP-14_W7.62mm | C14 |
| 1 | 330R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 2 | 47R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R4 |
| 1 | 150R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 2K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 1K5 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 10R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 2 | 27R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R25 |
| 1 | 200R | Potentiometer_Bourns_3266Y_Vertical | R11 |
| 5 | 12K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12, R16, R17, R19, R29 |
| 1 | 3M3 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
| 1 | 220k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15 |
| 5 | 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R18, R20, R21, R22, R23 |
| 1 | 47K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R24 |
Apple-II-R0 design files
The KiCad project lives in the reifsnyderb/Apple-II-R0 repository on GitHub; these links point at the commit this page was built from.
- LayoutAppleII.kicad_pcb
- SchematicAppleII.kicad_sch
Apple-II-R0: common questions
How big is the Apple-II-R0 PCB?
The Apple-II-R0 measures 215.5 × 361.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Apple-II-R0?
189 components, from 85 distinct parts. The full bill of materials is listed on this page.
Where can I download the Apple-II-R0 design files?
From the reifsnyderb/Apple-II-R0 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Apple-II-R0 design in my own project?
The repository has no license, so all rights stay with reifsnyderb. Use it as a reference, and ask the author before reusing the design.