exxos's Atari, Amiga & retro forum

kludge wrote: 10 Mar 2019 08:34

terriblefire wrote: 08 Mar 2019 07:26 There is a resistor pad in the Rev 3 for this purpose. North of the RaM cpld next to the SPI port.

What's a recommended value for RCLKLOAD?

Its more of a gut thing with this one. i'd start with 50 ohms and see where you get to.

terriblefire wrote: 10 Mar 2019 08:53 Its more of a gut thing with this one. i'd start with 50 ohms and see where you get to.

I'll order an assortment of 0603's then. Any idea what values I could need? 50, 500, 5k? 50, 100, 150? I have no clue :)

kludge wrote: 10 Mar 2019 08:58

terriblefire wrote: 10 Mar 2019 08:53 Its more of a gut thing with this one. i'd start with 50 ohms and see where you get to.

I'll order an assortment of 0603's then. Any idea what values I could need? 50, 500, 5k? 50, 100, 150? I have no clue :)

I never got this to work well. Hence why i redesigned the board as the TF534.

Out of curiosity what did you do to enhance the design in the 534? :?: :?: :?:

PaulJ wrote: 10 Mar 2019 14:58 Out of curiosity what did you do to enhance the design in the 534? :?: :?: :?:

I think that the main difference in this regard is 4 layers instead of two, making for a proper ground plane.

kludge wrote: 10 Mar 2019 15:04

PaulJ wrote: 10 Mar 2019 14:58 Out of curiosity what did you do to enhance the design in the 534? :?: :?: :?:

I think that the main difference in this regard is 4 layers instead of two, making for a proper ground plane.

No its massively more than this. I basically spent a month doing what your doing to the clock lines and got nowhere. I completely redesigned the topology of the clock. I no longer sell the TF530 because of this.

terriblefire wrote: 10 Mar 2019 15:17
No its massively more than this. I basically spent a month doing what your doing to the clock lines and got nowhere. I completely redesigned the topology of the clock. I no longer sell the TF530 because of this.

So terrible fire, would recomend bypassing the 530 and go directly to the 534? I didn't place the order for the 534's since I was going to build the 530's first. Sounds like maybe I should just bypass the 530's. The 534's gave me pause due to one of the cpld's has a smaller pin pitch than the cpld's used on the 530. Never the less what do you recomend?

You get more RAM, better clocks and you can use existing ZII ram which you cant with the 530.. and 44pin IDE.. The pitch is a bit harder but not massively so.

Sounds good, I've put in for 2 of the last eight. Give me the word and I'll forward the payment. :D :D :D

terriblefire wrote: 10 Mar 2019 15:17 No its massively more than this. I basically spent a month doing what your doing to the clock lines and got nowhere. I completely redesigned the topology of the clock. I no longer sell the TF530 because of this.

Sorry, it wasn’t my intention to downplay the work you put into it. I’ll probably spend two months on and off and then throw it in the trash.