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PCB68

BB68 in a more durable form

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Breadboard computers are fun but not very durable...

When I grew tired of hunting for whichever wire had come loose every time I took out BB68, I made this very simple 2-layer PCB and just moved all the parts over.

Traces on the bottom so I can see what is going on, big ground pour on top with just a few links. Works very well with a 10MHz crystal.

And yes that is a 68010 mounted, and yes it works. It runs the Byte magazine Sieve benchmark a whopping 9% faster than the 68000.

The three 20pin connectors are for attaching HP/Agilent Termination Adaptors for easy hookup to the logic analyzer.

Schematic.pdf

Adobe Portable Document Format - 608.64 kB - 05/05/2025 at 12:22

Preview

  • 1 × Motorola MC68010P12 CPU
  • 2 × AS6C4008 Memory ICs / Static RAM (SRAM)
  • 2 × SST 39SF040 512K x8 Flash ROM
  • 1 × MC68681 DUART
  • 1 × Altera EPM7964SLC-44 5V CPLD used as Address Decoder and Memory Mapper

View all 6 components

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