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Home » RBC Forums » General Discussion » CB030, A 68030 SBC for hobbyists
Re: CB030, A 68030 SBC for hobbyists [message #6949 is a reply to message #6946] Thu, 23 January 2020 20:17 Go to previous messageGo to previous message
plasmo is currently offline  plasmo
Messages: 916
Registered: March 2017
Location: New Mexico, USA
Senior Member
Status of CB030 and a question:

I received a couple 64 meg DRAM today and plug them in. They both work fine and pass memory diagnostic. These are 60nS DRAM so I'm able to run 0 wait state at 24MHz.

In term of producibility of rev0 CB030. I found it easy to build, in about 1 hour, and I've built 4 boards and got 4 working boards so the design seem to be producible.

Once I understood the privilege violation in CP/M68K with cache enabled, I just turn off 68030 cache when in CP/M68K. With cache off, it still run about 4 times faster than 8MHz 68000. I'm not too motivated to optimize CP/M68K for 68030 because I think it really should run more modern OS.

I'm ready to revise the board to fix known problems. The question I have is whether a FPU is absolutely needed to port Linux or other OS and how much RAM they need? I'm like fish out of water when it comes to Linux and BSD and modern OS in general.

Bill
 
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