Difference between revisions of "ISA Backplane"

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(Created page with "= 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...")
 
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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.
 
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.
  
−
* IC Sockets  
+
=== 1. IC Sockets ===
−
* Capacitors (polarity doesn't matter unless you are using electrolytic ones)
 
−
* ISA Slots
 
−
* ATX Power connector
 
−
* LED Lights
 
  
−
Once board is assembled plug it in and 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.
+
{|class="wikitable"
  
−
== Testing the board ==
+
|-
 +
!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
 +
|}
  
−
The board should be tested before plugging any additional cards into it. We can use a voltmeter to test the pins of the ISA slots to make sure they are providing the right voltage.
+
=== 2. Capacitors ===
 +
 
 +
{|class="wikitable"
 +
|-
 +
!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 ===
 +
{|class="wikitable"
 +
|-
 +
!component type
 +
!reference
 +
!Name
 +
!Qty
 +
|-
 +
|Connector
 +
|BUS1 - BUS8
 +
|Edge Connector 98 Pin
 +
|8
 +
|}
 +
 
 +
=== 4 ATX Power connector ===
 +
 
 +
{|class="wikitable"
 +
|-
 +
!component type
 +
!reference
 +
!Name
 +
!Qty
 +
|-
 +
|Connector
 +
|P3
 +
|ATX Connector
 +
|1
 +
|}
 +
 
 +
=== 5 LED Lights ===
 +
 
 +
 
 +
{|class="wikitable"
 +
|-
 +
!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.

Revision as of 23:57, 14 May 2021

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.

Isa-backplane.jpg

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.

  1. Turn on the backplane and use a volt meter to check voltage across the PCB including the expansion slots.
  2. Plug in the ATX power connector and the PCB and the standby light should go on.
  3. Then click the power button and the power lights should go on.
  4. 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.
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