Questions about an LCIII to LCIII+ overclock mod on machine with MC68030FE16B installed.

[djhaloeight]

Is there a specific app available that I can use to test the fpu or display info about it?

I believe the Techtool Pro application by Micromat will display if there is an FPU installed in the hardware section. Not sure about any apps to be able to test functionality. I’d like to be able to do that too.

 

[volvo242gt]

MacBench can test it... Won't be able to tell you if it's working properly, but you can run a pre-FPU installation test, then a post-installation test and compare between the two.

 

[Nixontheknight]

Hi,

Got a bit of time the other day to perform that overclock mod. Took about 5mins and worked perfectly. Machine showing up as 33mhz. Is there anything else I should be aware of?

I will just need to order some heatsinks. However I have also realised that with the NIC installed in the case, it doesn't leave much room for a heatsink as it obscures the processor. Are there smaller NICs available?

Regarding the 68882, I went for a rummage in my storage and found a spare amiga 1200 expansion that contains a PLCC 68882 at 33mhz. I have attached a picture, surely this will do rightly for the LC?

Is there a specific app available that I can use to test the fpu or display info about it?

I'd still like to pick up another though, so if anybody knows a reliable source, let me know!

Cheers folks.

speedometer should be able to test the FPU, and TattleTech will tell you if it really is an 882

 

[theirongiant]

Hi,

I will just need to order some heatsinks. However I have also realised that with the NIC installed in the case, it doesn't leave much room for a heatsink as it obscures the processor. Are there smaller NICs available?

I have a Farallon Ethernet card installed in my LC III, and I am considering this mod as well.

The gap between the top of the Motorola and the side of the NIC facing the CPU is about 1/2".

To account for fit with other Ethernet cards, ensure adequate airflow around the heatsink, account for the thickness of the thermal pad, and a healthy margin of error, you should subtract 1/8". Now you're left with a recommended maximum heatsink height (not necessarily absolute max height) of around 3/8" , or ~9.5mm.

The CPU surface measures approximately 7/8" or ~22mm.

For a maximum heatsink size of 22 x 22 x 9.5 mm, I think the one below is as good as close as you're going to get.

Easycargo heatsink (20mm x 20mm x 10mm, 10 pcs @ $7.99): https://www.amazon.com/dp/B07BDKN3XV/

This heatsink will cover 90% of the surface of the CPU. You can attach this heatsink to the CPU, FPU, and the VLSA controller (this one is larger than the other two), and still have parts left over to cover a lot more LC III's if you only do the CPU. That ain't bad for something that costs just $8 and maybe an hour of your time.

 

[Nixontheknight]

I have a Farallon Ethernet card installed in my LC III, and I am considering this mod as well.

The gap between the top of the Motorola and the side of the NIC facing the CPU is about 1/2".

To account for fit with other Ethernet cards, ensure adequate airflow around the heatsink, account for the thickness of the thermal pad, and a healthy margin of error, you should subtract 1/8". Now you're left with a recommended maximum heatsink height (not necessarily absolute max height) of around 3/8" , or ~9.5mm.

The CPU surface measures approximately 7/8" or ~22mm.

For a maximum heatsink size of 22 x 22 x 9.5 mm, I think the one below is as good as close as you're going to get.

Easycargo heatsink (20mm x 20mm x 10mm, 10 pcs @ $7.99): https://www.amazon.com/dp/B07BDKN3XV/

This heatsink will cover 90% of the surface of the CPU. You can attach this heatsink to the CPU, FPU, and the VLSA controller (this one is larger than the other two), and still have parts left over to cover a lot more LC III's if you only do the CPU. That ain't bad for something that costs just $8 and maybe an hour of your time.

I think the VLSI chip is the graphics chip, right?

 

[Phipli]

I think the VLSI chip is the graphics chip, right?

Its the Sonora Integrated Controller. I basically is 90% of the computer rolled into one chip. Yes it does video stuff, but also, RAM, sound control, the RTC/ADB/Cuda hangs off it, it controls the floppy drive... probably other stuff.