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dankal
[lang=en]But Wilfried ,the display modul of the Genius 68030 really look the same and works at 33Mhz , is the inside changed ? they are hard to find anyway and if you have to buy the cpu modul with it ,it will cost way too much !(1700 E last ebay sale )
But is it simply possible to replace a 68020 cpu by a 68030 or even a 68040 ?
That would be great as those cpu are now cheap (obsolete but still possible to find)
Regards[/lang]
Hi dankal,
the Genius module works with 33MHz, but it connects to the display with a lower speed. I don't know exactly but I guess it's 16MHz - that's why the normal display module works with the Genius.
The 68020 modules connect to the display with their original clock speed - that's OK for their standard speed but becomes a problem if you put the clock speed higher than 16..18MHz.
A few years ago, there was a replacement display available that was able to drive higher frequencies up to 24Mhz that could be soldered into the display module. Unfortunately, these displays were quite sensitive to the higher voltage you need to drive the overclocked module (up to 6V), so many of them died. Today, we don't know any compatible replacement display that's able to drive 24MHz.
As a consequence, I wouldn't recommend tuning your module to 24MHz now. Better stay at a lower speed (16..18MHz) and stay with the original display. Then you also don't need to exchange the CPU with a version that's able to drive 24MHz (which would have been necessary with 24MHz since you can't drive the 12MHz version that high).
Regards,
Dirk