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IBM PC XT 8-bit ISA Prototype PCB Card XL

Introduction

I have originally designed this prototypng PCB card for few of my projects, but this turn out so well that I have now posted all schematic, gerber files and documentation to fellow enthusiast such as yourself. Perhaps (and I hope) content in this obscured corner of interwebs will inspire you to start your own projects.

You can use these card in industry standard ISA XT 8-bit or AT 16-bit slot which is backward compatible. Card has been designed according to IMB ISA standard and can fit rear panel holder and will fit to classic PC XT or AT. PCB contains about 1600 holes in 0.1" matrix, enought to create more complex projects such as IDE or floppy card. World is your oyster in this case. To make the most of it use card in conjuction with IBM PC XT 8-bit ISA Bus Riser Extender Card to raise PCB above motherboard for easier access and protyping. Card has standard 62pin 2x31pin connectors with 45° chamfered edge for easy insertion.

These boards look absolutely gorgeous in standard green solder mask if you going for that standard industrial look.
I can advise you where to buy PCB rear mounting bracket, alternatively you can 3D print your own, files are all over interwebs.

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EDA preview

click on pictures to enlarge


PCB design layout

Specifications

Board Type: Prototype Board
Board Material: FR4-Standard Tg 130-140C Epoxy Glass Composite
Layers: Double sided
PCB Colour: Green colour solder mask, white silk screen lettering
Surface Finish: Lead free HASL-RoHS
External size: 140x100mm
Board Thickness: standard 1.6mm fits in standard 8-bit ISA card slot
Pitch: 2.54mm (100.00 mils)
Hole matrix: 54x29pin and bottom 12x4+ 62pin prototyping (1676pin in total)
Hole size: 1.00mm
Board Connector / Footprint: 62pin 2x31pin ISA Bus connector with 45° chamfered edge
Copper Thickness: 35um
Card weight: 50g

Bill of materials

Identifier	Value	Qty	Notes
Printed Circuit Board	8bit ISA prototype PCB 140 x 100 mm 2 Layer FR4	1	v1.2
Hardware	PC rear bracket	1

Assembly instructions and notes

■ for 45° chamfered edge use option Gold Fingers and 45°finger chamfered option when sending PCB to matufacture. If you by any chance forget to choose this option then you will have to chamfer edges withe sand paper, knife of file in later stages.
■ Gerber files contain " JLCJLCJLCJLC" to silk layer. You can specify a location of the order number, select the "Specify a location" option when you place an order. Only if you order via JLCPCB
. ■ Use a temperature-controlled soldering station and quality solder. Take care not to leave solder bridges as any short circuit will most likely lead to failures

Schematics

File type	File name	File size	Last modified
ISA 8bit extender Schematic v1.0	schematic_isa8bit_protoxl_v10.pdf	82 kB	20/06/2021
ISA 8bit extender Schematic v1.0	schematic_isa8bit_protoxl_v10.jpg	154 kB	20/06/2021

Design Files

File type	File name	File size	Last modified
PCB layers v1.2	pcblayers_isa8bit_protoxl_v12.pdf	229 kB	16/11/2021
Gerbers 140 x 100 mm, 2 Layer FR4; v1.2	gerber_isa8xl_v12.zip	130 kB	16/11/2021
Solder paste stencil	Not available for this project	-	-

Photographs

click on pictures to enlarge

Versions and revisions

This section lists the project version and revision history.

v1.2

■ Final version
■ Various cosmetic updates
■ Various silkscreen updates

Last page update: 15 August 2022

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