My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Lynxman · Post by **Lynxman** » Tue Jan 12, 2021 6:06 pm

Strange.

: TF536-02.jpg (114.11 KiB) Viewed 3857 times

My oscillator is a SIT8008BC-83-33E-100.000000T: https://www.digikey.no/products/no?keyw ... 000000T-ND

I have another one I can try instead. I bought two of them.

Lynxman · Post by **Lynxman** » Tue Jan 12, 2021 6:15 pm

I replaced the oscillator and get the same thing. Will try reflashing the CPLD.

EDIT:
Didn't change anything. Would be odd if it did.

EDIT:
Tried a 33 MHz (fake) CPU and get the same result.

Post by **alenppc** » Tue Jan 12, 2021 6:27 pm

It really doesn't. Sysinfo is utter garbage. Try AIBB and you'll get way more accurate results.

Lynxman · Post by **Lynxman** » Tue Jan 12, 2021 6:35 pm

AIBB 6.5 says CPU Clock is 40 MHz.

Lynxman · Post by **Lynxman** » Tue Jan 12, 2021 6:38 pm

I will take another look under the microscope. I know for sure there are no shorts but maybe a pin is lifted.

Post by **terriblefire** » Tue Jan 12, 2021 6:41 pm

Lynxman wrote: Tue Jan 12, 2021 6:38 pm I will take another look under the microscope. I know for sure there are no shorts but maybe a pin is lifted.

This is not possible. Like i couldnt make the board do that if i tried. It divides the input clock by 2. there is no known way to divide with logic like this.

Either there is an 80 mhz crystal on there, there is some tragic soldering between the CPLD and the CPU or the software is wrong.

Lynxman · Post by **Lynxman** » Tue Jan 12, 2021 6:58 pm

The CPLD solderings are good. I tugged every one of them. I probably received the wrong oscillators. They don't have frequency scribed on them.

Lynxman · Post by **Lynxman** » Tue Jan 12, 2021 7:06 pm

I don't think my solderings are bad. Every single leg has been pushed to check looseness.

: TF536-03.jpg (91.61 KiB) Viewed 3817 times

I will order new ocsillators and replace them. I'm glad it still works with the lower frequency.

Post by **alenppc** » Tue Jan 12, 2021 7:22 pm

Yes, it could be an 80 mhz crystal then, but the 536 will generally boot at that frequency only on a specific A500 revision (I think rev5 but not sure anymore), not on the other revs.

Lynxman · Post by **Lynxman** » Tue Jan 12, 2021 7:25 pm

Will let you know how it does with the new parts when I get them. Might as well just leave it at 40 MHz since it works and put it in the A2000. It lets me use the cheap fake 030's. Will runu a raytrace to see if it's stable.

I'm loving the buffered IDE. I have a CF card thatdidn't work properly in my TF534's with a short IDE cable but works great here even with a long cable.

exxos's Atari, Amiga & retro forum

My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.

Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.