Thanks for PCBWay for sponsoring the new PCBs production, more on them later in this post!

I have been working on a new motherboard revision since early October 2023 to fix the issue I found in my first motherboard prototype and add some new features.

The new onboard features are :

• mATX form factor.
• ATX 20 pins power input.
• Front panel header with onboard power switch + reset.
• A PS/2 mouse and keyboard controller (VIA - VT82C42V).
• DMA Controller.
• Dual onboard IDE ports.
• Onboard PC speaker/buzzer + header.
• CH376S module footprint for USB stick support.
• SDCard Module via SPI.

Here's a preview of the new motherboard v0.6 :

To be able to cramp everything on a 2 layers PCB with an mATX form factor, I had to make a imoprtant modification to the design. If you are looking at the expension slots, you can see that the first slot is labeled "CPU Card". Yes, the processor has been move onto a modular card with a PCI connector but beware, this port is not electricaly compatible with a standard PCI card!

This modification gave me the oportunity to move a good amount of ICs off the motherboard. All the bus transcievers has been moved to this card alongsdie the 82288 bus controller add a GAL20v8B acting as a clock generator chip. This gave me also the space to add a socket for a 80c287 Co-Processor!

The new motherboard v0.6 and the 80286 Processor card v0.3 where send to PCBWay to be produce this week. With their 3 to 4 days production time I should be able to do a review of the boards soon!

Thanks again to PCBWay for their great customer service!