There's been a lot going on over on Discord lately, and the pace is really picking up in rosco_m68k land!
One of the big things I've been trying to get done for quite some time is the rosco_m68k r2 (which, to differentiate from the upcoming Pro version, is to be renamed the rosco_m68k Classic). I'm pleased to say that I found some time over the weekend, and the first r2 PCBs are now in production at the fab!
This is going to be a huge quality-of-life enhancement to the existing r1.23 board, with highlights including:
- On-board XR68C681 replaces the MFP, providing 115.2Kbps serial
- 1MB ROM, up from 64KB max on the current board
- The new ROMs are flashable in-circuit (no more pulling to update!)
Under the hood there are more improvements, including a move away from 7400-series logic and manufacturability improvements that should increase reliability. As well as providing a faster UART out of the box, removing the MC68901 is a big win for the project as it means one less out-of-production IC to source.
I'll update more once the new boards are back from China, but in the meantime, here's a (already slightly-outdated) render from Kicad:
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