The Mackerel-08 PCBs have been working great for a few weeks, but that doesn't stop me wanting to tinker with the design. There were a few minor issues with the PCB (mostly cosmetic) and a few design decisions I wanted to change. Consider this patch notes for Mackerel-08 v1.1.

1. Corrected a few typos and errors in the silkscreen labels, including the expansion header pins

2. Changed the SD header to fit an Adafruit microSD breakout, also connected card detect pin to a DUART input pin.

3. SPI headers are condensed into a dual row pin header instead of box connectors

4. Expansion headers now expose all address lines and CPU control signals

5. Changed the footprint for the two oscillators to accept either DIP-8 or DIP-14 size cans

6. Added/removed some pullup resistors

7. Add a 5v switching regulator to the board. DC input is now 7-15VDC

8. Changed all resistors to 1206 SMD and placed them on the back of the board

Not exactly a huge overhaul, but the on-board regulator and full expansion header will prove useful in developing additional hardware for the board.

The updated schematic PDF and Gerbers are on Github: https://github.com/crmaykish/mackerel-68k/tree/master/releases/mackerel-08/v1.1