MicroATX ISA Backplane - Version 1.1
This backplane supports bus width up to 16 bits. It has onboard POST code indicators as well as a -5V regulator allowing you to use it with modern power supplies.
Available For Sale
[For sale at my eBay store]
- Bare PCB
- Individual Components
- Full Component Kit
Features
- ATX Power Connector
- 16 Bit ISA bus
Required Tools
- Soldering Iron,
- Flux
- Rosin core solder
- Voltmeter
Assembly Steps
Start with the shorter components first. This way you can lay the board down flat on the table and be able to solder them in. The taller components go next.
1. IC Sockets
| component type
|
reference
|
Name
|
Qty
|
| socket
|
U5, U6, U7
|
14 pin 300 mil DIP socket
|
3
|
| socket
|
U1, U2
|
16 pin 300 mil DIP socket
|
2
|
| socket
|
U3, U4
|
20 pin 300 mil DIP socket
|
2
|
2. Capacitors
| component type
|
reference
|
Name
|
Qty
|
| PCB
|
|
PCB
|
1
|
| Capacitor
|
C1 - C51
|
10 uF ceramic, 5.08 mm lead spacing
|
51
|
| Capacitor
|
C52
|
1 uF ceramic, 5.08 mm lead spacing
|
1
|
| Capacitor
|
C53 - C59
|
0.1 uF ceramic, 5.08 mm lead spacing
|
7
|
Polarity doesn't matter unless you are using electrolytic ones.
3. ISA Slots
| component type
|
reference
|
Name
|
Qty
|
| Connector
|
BUS1 - BUS8
|
Edge Connector 98 Pin
|
8
|
4 ATX Power connector
| component type
|
reference
|
Name
|
Qty
|
| Connector
|
P3
|
ATX Connector
|
1
|
5 LED Lights
| component type
|
reference
|
Name
|
Qty
|
| Diode
|
D1 - D5
|
5 mm LED
|
5
|
Power On and Test
The goal is to identify any short circuits that would cause problems. Before powering on the device check to see if there are shorts across any of the rails of the PCB.
- Turn on the backplane and use a volt meter to check voltage across the PCB including the expansion slots.
- Plug in the ATX power connector and the PCB and the standby light should go on.
- Then click the power button and the power lights should go on.
- The -5V regulator is option and if your power supply does not provide -5V then you can solder that in as well. Once the regulator is installed the -5V light should go on as well.
