HardLabs

ISA DualUARTParport

hkzlab·ISA_DualUARTParport

ISA DualUARTParport PCB layout, top view — open source board by hkzlab
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About the ISA DualUARTParport PCB

ISA DualUARTParport is an open source PCB design by hkzlab, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 176.5 × 90.2 mm, with 69 components from 35 distinct parts.

Other key parts include the 74LS138, 16550, GD75232N, 74LS30 and 74LS86. By type, the board carries 31 capacitors, 17 ICs, 8 connectors, 6 resistors, 4 diodes and 2 jumpers.

It belongs with the retro computing designs in this gallery.

From the project

8 bit ISA Parallel port + dual UART adapter

This board adds a parallel port and two serial (RS232) ports to computers with a free ISA slot.

The schematics of this board is heavily inspired by the parallel port schematics found in the IBM 5150 Technical Reference, with just a few changes (IRQ level triggering and configurable port directionality) and by Sergey's floppy/serial controller.

Both serial ports and the parallel port addressing/IRQs are configurable.

ISA DualUARTParport, from the project README
From the project README

Main components on the ISA DualUARTParport

74LS13816550GD75232N74LS3074LS8674LS0274LS15574LS24574LS17474LS37474LS0574LS12574LS24074LS244

ISA DualUARTParport bill of materials (BOM)

69 components, 35 distinct parts.

QtyPartRefs
2
74LS138
U1, U2
2
16550
U4, U22
2
GD75232N
U5, U6
1
74LS30
U11
1
74LS86
U12
1
74LS02
U13
1
74LS155
U14
1
74LS245
U15
1
74LS174
U16
1
74LS374
U17
1
74LS05
U18
1
74LS125
U19
1
74LS240
U20
1
74LS244
U21
1
1.8432Mhz
X1
1
ISA BUS
J1
1
ADDR_IRQ
J2
1
UART1_SEL
J3
1
UART2_SEL
J4
1
Parallel Port LEDs
J5
Show 15 more
QtyPartRefs
1
Serial 2 IDC
J6
1
Parport IRQ Select
J9
1
Parallel Port
J10
1
Address selection
JP1
1
Parport type
JP2
1
LED RX1
D1
1
LED TX1
D2
1
LED RX2
D3
1
LED TX2
D4
4
10uF
C1, C3, C5, C6
18
100nF
C2, C4, C7, C8, C9, C10, C11, C12 +10
9
2.2nF
C27, C28, C29, C30, C31, C32, C33, C34 +1
4
2.7k
R1, R2, R3, R4
1
4.7k
RN1
1
1k
RN2

ISA DualUARTParport design files

The KiCad project lives in the hkzlab/ISA_DualUARTParport repository on GitHub; these links point at the commit this page was built from.

ISA DualUARTParport: common questions

How big is the ISA DualUARTParport PCB?

The ISA DualUARTParport measures 176.5 × 90.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ISA DualUARTParport?

69 components, from 35 distinct parts. The full bill of materials is listed on this page.

Where can I download the ISA DualUARTParport design files?

From the hkzlab/ISA_DualUARTParport repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the ISA DualUARTParport design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

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