JC2 - IO2 Board
About the JC2 - IO2 Board
JC2 - IO2 Board is an open source PCB design by Emile666, published on GitHub. It is a 2-layer board measuring 233.7 × 160 mm, with 96 components from 51 distinct parts.
Other key parts include the 74LS244, 74LS245, 6522, AMS1117-3.3 and ATF22V10. By type, the board carries 26 resistors, 24 capacitors, 21 ICs, 16 connectors, 2 crystals and 1 battery holder.
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 - IO2 Board
JC2 - IO2 Board bill of materials (BOM)
96 components, 51 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 74LS244 | DIP-20_W7.62mm_Socket | U1, U2, U13 |
| 1 | 74LS245 | DIP-20_W7.62mm_Socket | U3 |
| 2 | 6522 | DIP-40_W15.24mm | U4, U5 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U7 |
| 1 | ATF22V10 | DIP-24_W7.62mm | U8 |
| 3 | MCP23017 | DIP-28_W7.62mm | U9, U11, U21 |
| 1 | DS1307+ | DIP-8_W7.62mm | U14 |
| 1 | SN76489 | CERDIP-16_W7.62mm_SideBrazed_Socket | U15 |
| 1 | 74LS165 | DIP-16_W7.62mm | U16 |
| 1 | LM386 | DIP-8_W7.62mm | U17 |
| 1 | DS2482 | SOIC-8W_5.3x5.3mm_P1.27mm | U18 |
| 1 | 24LC512 | DIP8_SOIC8 | U19 |
| 1 | 23LC1024 | DIP8_SOIC8 | U20 |
| 1 | MCP23017 | SOIC-28W_7.5x18.7mm_P1.27mm | U22 |
| 2 | MCP23017_SO | SOIC-28W_7.5x17.9mm_P1.27mm | U23, U24 |
| 1 | 4.00 MHz | Oscillator_DIP-14 | X1 |
| 1 | 32.768 kHz | Crystal_C38-LF_D3.0mm_L8.0mm_Horizontal | Y1 |
| 1 | Expansion | DIN41612_C_2x32_Male_Horizontal_THT | J1 |
| 1 | Audio Jack | Jack_3.5mm_PJ320D_Horizontal | J2 |
| 1 | PORT A | PinSocket_2x07_P2.54mm_Horizontal | J3 |
Show 31 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PORT B | PinHeader_2x08_P2.54mm_Horizontal | J4 |
| 1 | Parallel Port Interconnect | IDC-Header_2x10_P2.54mm_Vertical | J6 |
| 2 | SPI_I2C_OW | PinHeader_2x07_P2.54mm_Vertical | J7, J13 |
| 1 | CF-IDE-44 Header | PinHeader_2x22_P2.00mm_Vertical | J8 |
| 1 | AUDIO_OUT | PinHeader_2x01_P2.54mm_Vertical | J10 |
| 1 | EXT POWER | PinHeader_1x05_P2.54mm_Vertical | J11 |
| 1 | SND_OUT | PinHeader_2x01_P2.54mm_Vertical | J12 |
| 1 | PORT EF | PinHeader_2x10_P2.54mm_Vertical | J14 |
| 1 | Micro_SD_Card | SD_Card-micro_socket_A | J15 |
| 1 | PORT GH | PinHeader_2x10_P2.54mm_Vertical | J16 |
| 1 | PORT IJ | PinHeader_2x10_P2.54mm_Vertical | J17 |
| 1 | ADDA | PinHeader_2x06_P2.54mm_Vertical | J18 |
| 1 | CR2032 | BatteryHolder_Keystone_107_1x23mm | BT1 |
| 1 | ADDR | PinHeader_2x03_P2.54mm_Vertical | JP1 |
| 1 | BSS138 PCB | DIP-12_W10.16mm | PCB1 |
| 1 | PCF8591 PCB | PCF8591_PCB | PCB2 |
| 1 | 10K | Potentiometer_ACP_CA14-H5_Horizontal | RV1 |
| 1 | ACT | LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | LD1 |
| 1 | LD_PWR | LED_D3.0mm | D4 |
| 16 | 100n | C_Rect_L4.6mm_W2.0mm_P2.50mm_MKS02_FKP02 | C1, C2, C3, C4, C5, C8, C15, C16 +8 |
| 3 | 10u/6V3 | CP_Radial_D5.0mm_P2.00mm | C9, C23, C25 |
| 2 | 220uF | CP_Radial_D8.0mm_P5.00mm | C10, C14 |
| 1 | 47n | C_Rect_L4.6mm_W2.0mm_P2.50mm_MKS02_FKP02 | C11 |
| 2 | 10uF | CP_Radial_D5.0mm_P2.00mm | C12, C13 |
| 12 | 330 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R16, R19, R27, R28, R29, R30 +4 |
| 3 | 4K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4, R15 |
| 1 | 1K2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 10 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 2 | 2K2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R17, R18 |
| 6 | 75 | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R20, R21, R22, R23, R24, R26 |
| 1 | 2K2 | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R25 |
JC2 - IO2 Board design files
The KiCad project lives in the Emile666/JC2 repository on GitHub; these links point at the commit this page was built from.
- LayoutHardware/IO2/JC2_IO.kicad_pcb
- SchematicHardware/IO2/JC2_IO.kicad_sch
JC2 - IO2 Board: common questions
How big is the JC2 - IO2 Board?
The JC2 - IO2 Board measures 233.7 × 160 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the JC2 - IO2 Board?
96 components, from 51 distinct parts. The full bill of materials is listed on this page.
Where can I download the JC2 - IO2 Board 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 - IO2 Board 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.
