GeekDot
Well-known member
Hey gang,
After many moons of waiting on my todo-stack, I finally repaired my Radius Rocket. Runs fine and all...
..but there's one strange thing I came about when doing nastier things than running MacBench: It claims not having an MMU (while the installed 68040/25 certainly has one) - the 'mmu ' Gestalt return-code is empty.
I'm not the first one stumbling across this, like this guy in 1999... and it looks like there are some more 040 accelerators not providing MMU functionality.
A quick measurement showed they're asserting /MDIS ("MMU disable", pin S6, pulled high)... anybody every heard why they did that?
I was under the impression that a Rocket is a completely "sandboxed" Q9x0 minus I/O and own bus.
After many moons of waiting on my todo-stack, I finally repaired my Radius Rocket. Runs fine and all...
..but there's one strange thing I came about when doing nastier things than running MacBench: It claims not having an MMU (while the installed 68040/25 certainly has one) - the 'mmu ' Gestalt return-code is empty.
I'm not the first one stumbling across this, like this guy in 1999... and it looks like there are some more 040 accelerators not providing MMU functionality.
A quick measurement showed they're asserting /MDIS ("MMU disable", pin S6, pulled high)... anybody every heard why they did that?
I was under the impression that a Rocket is a completely "sandboxed" Q9x0 minus I/O and own bus.