Low-cost A600 acceleration theory

[Matt_H]

With the 500, 1000, and 2000 you could pop out the 68000 and replace it with a 68010 or faster 68000. No need for any other hardware (I think).

Would it be possible to clip a 68000/20 over the one on the 600 motherboard in the usual reverse-socket manner without the need for modification? I'm looking at the MC68HC000FN20. $8.21 for the chip, let's say $10(?) for a socket. $20 for a 2 MIPS (so claimed by Motorola) upgrade isn't bad... provided this theory actually works.

But then there's still the limited memory problem... Sigh.

[Matt_H]

Yes, it's a top-of-the-line 68000 at 20Mhz. Maybe I didn't look hard enough, but the only crystal on the 600 motherboard I saw was clocked at 28Mhz. Same with the 1200. I assume there's a dividing value somewhere else. The 600's default 68000 is actually an 8Mhz chip clocked down to 7. Time to check inside the machine again...

[Matt_H]

So we'd need a 1.4 divider for a 20Mhz chip. Or maybe overclock it to 28Mhz with a divider of 1. Where is this setting controlled from?

I did a quick glance through motorola's documentation. 68000-type chips in the 68pin Lead Quad Pack (that is the format used in the 600, yes?) look to be fully pin compatible (See this , page 173), even the 010.  Anyone got any 600 schematics?