exxos's Atari, Amiga & retro forum

Yepp, ADJ trace is cutted and 3.3V connected instead, getting 3.28V from the regulator, should be fine..
tried several CF cards - getting same behavior..

Need to burn some DiagROMs now, stumbled on this:


These EPROMS are repainted and reprinted MX27C4100's 🤕
Any reason to do that? 🤔

8 Bit Dreams wrote: 14 Nov 2021 11:00 Yepp, ADJ trace is cutted and 3.3V connected instead, getting 3.28V from the regulator, should be fine..
tried several CF cards - getting same behavior..

Need to burn some DiagROMs now, stumbled on this:
IMG_20211031_171755.jpg
These EPROMS are repainted and reprinted MX27C4100's 🤕
Any reason to do that? 🤔

Got exactly the same stuff instead of AMD. Irony is that those repainted chips are faster!

Ok, reporting success! Design is surely working! My issue was BUS Transceivers - changed these out and card booted without any issues:


Is it locked to 50MHz?

Not Locked to 50mhz it's CPU dependent on overclockable CPU, but 80mhz is most you will get at the moment

Ok, tried several settings - can't go above 75MHz,
getting freeze on 79,5 immediately, but hey, that's impressive anyway! Very pleased how smooth it works!
Thank You very much Mr.Leary! :P

8 Bit Dreams wrote: 14 Nov 2021 12:08 Is it locked to 50MHz?

Add heat sinks to the CPLD's and CPU and you will get 62.5mhz, maybe even 75mhz.
I have added a laptop cpu blower fan, it lays flat on the A1200 motherboard and blows air over the CPLD's and CPU. It's stable at 75mhz all day.

Yeah that firmware design pushes the CPLDs over their design limits .

I assembled 3 TF1260 cards for my three Amiga 1200 computers.
I programmed them with the BETA firmware from the file "tf1260r1_2021_09_07_999.zip". In one card I soldered 128 RAM in the other two 64MB it looks like it is working properly.
I have a problem with the "cpuspeed" program. When I try to increase the speed to 62.5MHz, the cards that have 64MB soldered freeze the computer. The card with 128MB soldered works fine, but reading errors appear when reading files from the CF card. The parts I used as ram memory: 128MB - MT48LC32M16A2P-75IT, 64MB - MT48LC16M16A2-75 and MT48LC16M16A2-6. I changed the CPLD circuits a few different pieces and I have the same symptoms all the time.
Is this a problem with my soldering or are the memory chips wrong?

The TF1260 works at 50Mhz.. everything above is a bonus. Its the CPLDs that are the limit with the current firmware design. As i've mentioned about 5000 times there is a new one coming. Patience.

EDIT: For the love of <insert your preferred deity here> do not rip apart a working card just because it doesn't overclock.

terriblefire wrote: 16 Nov 2021 09:05 EDIT: For the love of Jason Donovan do not rip apart a working card just because it doesn't overclock.

Now now, Jason has a lot on his hands. It's unfair to burden him.