JC2 v4.1
About the JC2 v4.1 PCB
JC2 v4.1 is an open source PCB design by Emile666, published on GitHub. It is a 2-layer board measuring 233.7 × 160 mm, with 120 components from 79 distinct parts.
Other key parts include the 6502, 27C256, AS6C4008, 6532 and 74F04. By type, the board carries 28 resistors, 27 capacitors, 26 switches, 13 ICs, 10 connectors and 6 LEDs.
From the project
Junior-Computer-2 HW and SW
Fourty years later, Joerg Walke created the Junior-Computer 2, which is an expanded version of the original Junior Computer. It contained 32 KB RAM, 8KB ROM and an onboard RS232 serial interface. The development of the Junior Computer 2 is still in progress and you can read all about it on the web-site of Joerg: https://old-computer-tech.net/junior-computer/
Main components on the JC2 v4.1
JC2 v4.1 bill of materials (BOM)
120 components, 79 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 6502 | DIP-40_W15.24mm | U1 |
| 1 | 27C256 | DIP-28_W15.24mm | U2 |
| 1 | AS6C4008 | DIP-32_W15.24mm | U3 |
| 1 | 6532 | DIP-40_W15.24mm | U4 |
| 1 | 74F04 | DIP-14_W7.62mm | U5 |
| 1 | 74LS01 | DIP-14_W7.62mm | U6 |
| 1 | 74LS145 | DIP-16_W7.62mm | U9 |
| 1 | LM556 | DIP-14_W7.62mm | U10 |
| 1 | ULN2003 | DIP-16_W7.62mm | U11 |
| 1 | 6551 | DIP-28_W15.24mm | U12 |
| 1 | MAX232 | DIP-16_W7.62mm | U13 |
| 1 | ATF1504AS | PLCC-44_THT-Socket | U14 |
| 1 | 6522 | DIP-40_W15.24mm | U15 |
| 1 | BC516 | TO-92_Inline | Q1 |
| 1 | 1MHz | Crystal_HC18-U_Vertical | X1 |
| 1 | 1.8432 MHz | Crystal_HC18-U_Horizontal | X2 |
| 1 | 1 MHz | Oscillator_DIP-14 | X3 |
| 1 | C2X32_AC_MALE | DIN41612_C_2x32_Male_Horizontal_THT | J1 |
| 1 | DB25_Male | DSUB-25_Male_Horizontal_P2.77x2.84mm_EdgePinOffset9.40mm | J2 |
| 1 | Power | BarrelJack_GCT_DCJ200-10-A_Horizontal | J3 |
Show 59 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | RIOT Connector | IDC-Header_2x10_P2.54mm_Vertical | J4 |
| 1 | EXT POWER | PinHeader_1x05_P2.54mm_Vertical | J5 |
| 1 | BOB-12731 | BOB-12731 | J7 |
| 1 | VIA Connector | IDC-Header_2x12_P2.54mm_Vertical | J8 |
| 1 | SPK | PinHeader_1x02_P2.54mm_Vertical | J10 |
| 1 | VCC | Pin_D0.9mm_L10.0mm_W2.4mm_FlatFork | J91 |
| 1 | NC | Pin_D0.9mm_L10.0mm_W2.4mm_FlatFork | J92 |
| 1 | Buzzer | Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | SPK_ENBL | PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | RST | Switch_JC2 | SW1 |
| 1 | STP | Switch_JC2 | SW2 |
| 1 | 0 | Switch_JC2 | SW3 |
| 1 | 1 | Switch_JC2 | SW4 |
| 1 | 2 | Switch_JC2 | SW5 |
| 1 | 3 | Switch_JC2 | SW6 |
| 1 | 4 | Switch_JC2 | SW7 |
| 1 | 5 | Switch_JC2 | SW8 |
| 1 | 6 | Switch_JC2 | SW9 |
| 1 | 7 | Switch_JC2 | SW10 |
| 1 | 8 | Switch_JC2 | SW11 |
| 1 | 9 | Switch_JC2 | SW12 |
| 1 | A | Switch_JC2 | SW13 |
| 1 | B | Switch_JC2 | SW14 |
| 1 | C | Switch_JC2 | SW15 |
| 1 | D | Switch_JC2 | SW16 |
| 1 | E | Switch_JC2 | SW17 |
| 1 | F | Switch_JC2 | SW18 |
| 1 | AD | Switch_JC2 | SW19 |
| 1 | DA | Switch_JC2 | SW20 |
| 1 | + | Switch_JC2 | SW21 |
| 1 | GO | Switch_JC2 | SW22 |
| 1 | PC | Switch_JC2 | SW23 |
| 1 | STEP | SW_Push_2P2T_Toggle_CK_PVA2OAH5xxxxxxV2 | SW24 |
| 1 | DISPLAY | SW_Push_2P2T_Toggle_CK_PVA2OAH5xxxxxxV2 | SW25 |
| 1 | POWER SWITCH | SW_CK_JS202011CQN_DPDT_Straight | SW26 |
| 6 | LTS-457A | 7SegmentLED_LTS6760_LTS6780_mod_Emile | DS1, DS2, DS3, DS4, DS5, DS6 |
| 2 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 1 | LD_GO | LED_D3.0mm | D3 |
| 1 | LD_PWR | LED_D3.0mm | D4 |
| 1 | 10p | C_Rect_L4.6mm_W2.0mm_P2.50mm_MKS02_FKP02 | C1 |
| 13 | 100n | C_Rect_L4.6mm_W2.0mm_P2.50mm_MKS02_FKP02 | C2, C3, C4, C5, C6, C7, C9, C10 +5 |
| 1 | 47u/16V | CP_Radial_D5.0mm_P2.00mm | C13 |
| 1 | 30pF | C_Rect_L4.6mm_W2.0mm_P2.50mm_MKS02_FKP02 | C15 |
| 4 | 1u/16V | CP_Radial_D5.0mm_P2.00mm | C16, C17, C18, C19 |
| 1 | 470n | C_Rect_L4.6mm_W2.0mm_P2.50mm_MKS02_FKP02 | C20 |
| 4 | 100n | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C21, C22, C23, C24 |
| 1 | 220p | C_Rect_L4.6mm_W2.0mm_P2.50mm_MKS02_FKP02 | C25 |
| 1 | 1000u/16V | CP_Radial_D10.0mm_P5.00mm | C27 |
| 3 | 3K3 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3 |
| 1 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 330 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 3 | 2K2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7, R9, R17 |
| 2 | 68K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R10 |
| 1 | 820K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11 |
| 5 | 4K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12, R15, R16, R31, R32 |
| 1 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
| 7 | 82 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R19, R20, R21, R22, R23, R24, R25 |
| 3 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R26, R27, R30 |
| 1 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R28 |
JC2 v4.1 design files
The KiCad project lives in the Emile666/JC2 repository on GitHub; these links point at the commit this page was built from.
JC2 v4.1: common questions
How big is the JC2 v4.1 PCB?
The JC2 v4.1 measures 233.7 × 160 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the JC2 v4.1?
120 components, from 79 distinct parts. The full bill of materials is listed on this page.
Where can I download the JC2 v4.1 design files?
From the Emile666/JC2 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the JC2 v4.1 design in my own project?
The repository has no license, so all rights stay with Emile666. Use it as a reference, and ask the author before reusing the design.
