1336 (39*34+10) hole 8-bit ISA prototype PCB for designing cards for retro PCs. Designed to be cheap (size 99.5mm x 99.5mm) and have as many holes as possible.

It is also designed to have a 45-degree bevel at the connector for better lifespan of the card and the slot. Order with edge connector enabled and a 45-degree bevel.

ISA (Industry Standard Architecture) is a parallel computer bus standard developed in the early 1980s for IBM PCs and compatibles. It was the main internal expansion bus for personal computers throughout the 1980s and early 1990s. ISA allows hardware devices like sound cards, network cards, or custom interface boards to communicate with the CPU and memory. Despite being largely obsolete in modern systems, its simplicity, 8-bit or 16-bit data paths, and well-documented protocol make it an excellent platform for learning and experimentation in retro computing projects.

Full project page & making of: https://maniek86.xyz/projects/isaprotoboard.php

One of the projects I made using this protoboard is a custom ISA debug & POST (Power On Self Test) card shown below

Based on: https://github.com/JayesonLS/ISA-Cards (IsaTemplate)