ISA QuadUART2
About the ISA QuadUART2 PCB
ISA QuadUART2 is an open source PCB design by hkzlab, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 104.1 × 102.9 mm, with 39 components from 20 distinct parts.
Other key parts include the 74HCT138, GD75232N, 16C554, 74HCT32 and 74LS245. By type, the board carries 17 capacitors, 10 ICs, 9 connectors, 2 resistors and 1 crystal.
From the project
This 8-bit ISA board will provide 4 serial RS232 ports using a single 16C554 controller. 2 ports are exposed on an external bracket and 2 are on internal headers.
This 8-bit ISA board will provide 4 serial RS232 ports using a single 16C554 controller.
Port 1 and 2 are exposed on the bracked as DB9 male connectors. Port 3 and 4 are internal.
IRQs will be shared between port 1/3 and port 2/4.
I take NO responsibility for what happens if you decide to build and use this card. Your computer might crash, catch fire or be destroyed in other nasty ways. You're encourauged to take what you deem fit from this, and use it in your projects!
Main components on the ISA QuadUART2
ISA QuadUART2 bill of materials (BOM)
39 components, 20 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74HCT138 | DIP-16_W7.62mm_LongPads | U1, U2 |
| 4 | GD75232N | DIP-20_W7.62mm_LongPads | U5, U6, U25, U26 |
| 1 | 16C554 | PLCC-68_THT-Socket | U23 |
| 1 | 74HCT32 | DIP-14_W7.62mm_LongPads | U24 |
| 1 | 74LS245 | DIP-20_W7.62mm_LongPads | U29 |
| 1 | 74HCT21 | DIP-14_W7.62mm_LongPads | U30 |
| 1 | 1.8432Mhz | Oscillator_DIP-14-8 | X1 |
| 1 | ISA BUS | Conn_Edge_PCB_ISA8 | J1 |
| 1 | ADDR_IRQ | PinHeader_1x08_P2.54mm_Vertical | J2 |
| 1 | UART1_SEL | PinHeader_1x08_P2.54mm_Vertical | J3 |
| 1 | UART2_SEL | PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | ADDR | PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | UART3_SEL | PinHeader_1x04_P2.54mm_Vertical | J8 |
| 1 | Serial 4 IDC | PinHeader_2x05_P2.54mm_Vertical | J11 |
| 1 | Serial 3 IDC | PinHeader_2x05_P2.54mm_Vertical | J12 |
| 1 | UART4_SEL | PinHeader_1x04_P2.54mm_Vertical | J13 |
| 4 | 10uF | CP_Radial_D5.0mm_P2.50mm | C1, C3, C5, C6 |
| 13 | 100nF | C_Disc_D6.0mm_W2.5mm_P5.00mm | C2, C4, C7, C8, C9, C10, C11, C17 +5 |
| 1 | 10k | R_Array_SIP5 | RN2 |
| 1 | 10K | R_Array_SIP9 | RN3 |
ISA QuadUART2 design files
The KiCad project lives in the hkzlab/ISA_QuadUART2 repository on GitHub; these links point at the commit this page was built from.
- LayoutISA_QuadUART.kicad_pcb
ISA QuadUART2: common questions
How big is the ISA QuadUART2 PCB?
The ISA QuadUART2 measures 104.1 × 102.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the ISA QuadUART2?
39 components, from 20 distinct parts. The full bill of materials is listed on this page.
Where can I download the ISA QuadUART2 design files?
From the hkzlab/ISA_QuadUART2 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the ISA QuadUART2 design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which hkzlab chose for the repository.