View Full Version : VXL30 and an MMU
25 September 2009, 03:57
I am currently working on my Amiga 2000 with a VXL30 which had a EC030 clocked at 40 MHz. I purchased a 50 MHz 030 with a MMU (while still using the 40 MHz crystal). Looking at the pin side of the 2 CPUs the the mmu cpu has 2 more pins which line up with the socket on the VXL. I can't find any jumper setting to use the MMU. ( I assumed that just installing the new chip would make it available). When I run AIBB it does not register that there is a MMU. I can't figure out what I am doing wrong. Also reading the manuals, there is a note stating that clocking the CPU at 50 MHz runs into problems Does anyone know what the problems are?
Any help would be greatly appreaciated.
25 September 2009, 04:03
I have the same setup, the difference is I am yet to put my MC68030@40 in there, (motherboard issues.... oh my am I plauged!)
I have the manual, I will scan it and up it for you. as far as I know the MMU is integral to the CPU and thats how its recognised, although, saying that I could be wrong... I will need to check.
25 September 2009, 10:46
AFAIK most programs only show if MMU is currently active, not if it is available. AmigaOS does not need or use 68030 MMU normally. (Things get different with 68040+)
Detecting between 68030 and 68EC030 is practically impossible because at least some EC030's have broken MMU that can crash the system if it is used.
25 September 2009, 12:56
Increasing CPU clock might have impact on PAL chips.
Check board revision.
25 September 2009, 18:40
To test the MMU just issue the command "CPU fastROM" in a CLI window, then use Sysinfo to show the MMU use.
29 September 2009, 08:02
Thanx it appeared on sysinfo.
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