Acill's Amiga Repair Thread

[Acill]

This 1240 is now a 66Mhz 060!

[Acill]

Busy night,  another 040 to 060 conversion. This time it's a 3640  at 66Mhz!

[kneehighspy]

more awesome work Acill.  thanks for posting.

//kneehighspy

[desantii]

Will running that 3640(now 3660) at 66mhz make the motherboard run at 33mhz? Probably the limit of what it can do...

Or is the speed independent of the 25mhz clock running the mb

[Acill]

Will running that 3640(now 3660) at 66mhz make the motherboard run at 33mhz? Probably the limit of what it can do...

Or is the speed independent of the 25mhz clock running the mb

The speed does not make the MB run faster, only the CPU from my understanding since you set the clock jumpers for accelerator to EXT on the A4000 which uses the oscillator on the accelerator instead of the one on the board. This makes the crystal on the 3640 run at full speed as well instead of the half speed the usual 040 runs at. This is the fastest the 3640 will run however stable. The CPU on it in another accelerator can run as high as 100Mhz I've seen. Cosmos is the better person to ask about this version of the upgrade though. He designed it from what I understand. I just built it from the parts he supplied and soldered it all together.

[Cosmos Amiga]

Cosmos is the better person to ask about this version of the upgrade though. He designed it from what I understand

It's Mozart the author, banned from a1k.org !!

[magnetic]

These amiga websites banning people left and right are absurd. The power hungry losers that run alot of amiga sites need to get a life.

Good job Acill!

[desantii]

I always though EXT means the MB is running based on the external CPU board clock...Is this the same case on a A3000?

The speed does not make the MB run faster, only the CPU from my understanding since you set the clock jumpers for accelerator to EXT on the A4000 which uses the oscillator on the accelerator instead of the one on the board. This makes the crystal on the 3640 run at full speed as well instead of the half speed the usual 040 runs at. This is the fastest the 3640 will run however stable. The CPU on it in another accelerator can run as high as 100Mhz I've seen. Cosmos is the better person to ask about this version of the upgrade though. He designed it from what I understand. I just built it from the parts he supplied and soldered it all together.

[Acill]

I always though EXT means the MB is running based on the external CPU board clock...Is this the same case on a A3000?

I honestly dont get what magic they do with that EXT jumper. The 3000 one acts very strange too. I know you have to have it set of the CPU card uses its own oscillator, but other times you dont use it as if using an A3630.

It could be running at 33 in this case yes, and I know with the 3640 conversion the best I have ever seen them go with a rev 6 is 66. Its sad since that CPU can go to 100 easily. I have my CSPPC running at 85 for example and its very cool to the touch still.

[Acill]

I just got word that I will be traveling for work Monday the 19th for 3 weeks. I have a few boards in getting work done, but as I have mentioned in the past things can go slow at times. If you are waiting for a board and havent heard from me directly before this posting I wont be able to complete it before getting back from Amiwest.

[magnetic]

I honestly dont get what magic they do with that EXT jumper. The 3000 one acts very strange too. I know you have to have it set of the CPU card uses its own oscillator, but other times you dont use it as if using an A3630.

.

Lol its not "magic" its pretty definitive. Some boards need the clock to come from the mb crystal some have onboard crystal. For ex. the 3630 must use the 4000 mb crystal as it does not have one of its own. The 3640 has onboard crystal so the jumper is set accordingly.

[kirk_m]

I received my A3000 back from Acill today.  I had sent it in for a recap, battery area repair and adding a coin cell battery.   I also had him add a socket for the crystal oscillator for the CPU, and provide me with a 50MHz crystal oscillator.  My machine is a 16MHz version, and, just switching the jumpers doesn't overclock it, despite what everyone keeps bandying about here and elsewhere.  The machine won't even boot when the jumpers are changed to 25MHz settings with the 32 MHz crystal.  Well, after the 50MHz is put in, the machine boots right up, and software detects it as 25MHz!

Now I can use SuperBuster 11 properly (needs a 25MHz machine, regardless of whether you have a processor card added) with my BigRam and X-Surf-100.  There is a known malfunction of the X-S-100 when used on a 16MHz A3000 that also has a SuperBuster-11 in it, according to Jens.

Thanks, Paul, for excellent work again.

[Acill]

i received my a3000 back from acill today.  I had sent it in for a recap, battery area repair and adding a coin cell battery.   I also had him add a socket for the crystal oscillator for the cpu, and provide me with a 50mhz crystal oscillator.  My machine is a 16mhz version, and, just switching the jumpers doesn't overclock it, despite what everyone keeps bandying about here and elsewhere.  The machine won't even boot when the jumpers are changed to 25mhz settings with the 32 mhz crystal.  Well, after the 50mhz is put in, the machine boots right up, and software detects it as 25mhz!

Now i can use superbuster 11 properly (needs a 25mhz machine, regardless of whether you have a processor card added) with my bigram and x-surf-100.  There is a known malfunction of the x-s-100 when used on a 16mhz a3000 that also has a superbuster-11 in it, according to jens.

Thanks, paul, for excellent work again.

love these comments!

[magnetic]

Now I can use SuperBuster 11 properly (needs a 25MHz machine, regardless of whether you have a processor card added) with my BigRam and X-Surf-100.  There is a known malfunction of the X-S-100 when used on a 16MHz A3000 that also has a SuperBuster-11 in it, according to Jens.

Thanks, Paul, for excellent work again.

awesome! you have a super nice rare amiga there! That part about people telling u to just move the jumper made me lol. how dumb.. Good work as always Paul!

[Acill]

Some very early Amiga work before catching my 6am flight to Norfolk. Happy to say this recap went fast and trouble free. I couldn't sleep so this one gets out before I left saving the owner two of weeks of waiting now. I did the PSU conversion to a 190 watt ATX inside original case too. It's powering this 500 for a final test before packing and shipping home.

[SACC-guy]

@Acill
Are you going to be accepting items at Amiwest2016?