exxos's Atari, Amiga & retro forum

@matt020 have you tried the TF536 without the A2091 installed?

dalek wrote: 16 Jul 2020 00:52 @matt020 have you tried the TF536 without the A2091 installed?

I didn't, I really felt that because I was having the same results as other people, removing the A2091 would'nt make any difference. In hindsight, I probably should have removed it..

Of the other people here who are having TF536 and A2000 problems, do you have any cards plugged into the Zorro slots??

I had all cards removed during my tests...

Maybe it's worth to recompile rev.1 FW we used to rev.2 pcbs and check does it work on A2k or not...🤔

Just flash the working rev1 firmware in the rev2. IDE will not work everything else is unchanged.

The A2000 has a lot of resistor packs near the 68000 socket, could it be a termination issue due to the pull ups on A24-A31?

Maximilian wrote: 16 Jul 2020 15:28 The A2000 has a lot of resistor packs near the 68000 socket, could it be a termination issue due to the pull ups on A24-A31?

A24-A31 are entirely internal to the TF536.. so its not likely. Its more likely an issue with the clock phase control.

I flashed my board back to the rev1 firmware.

Same behavior as before with the 3.1 rom, flashing bars followed by a black screen.

DiagROM 1.2 doesn't get as far as before, hanging during the fastmem check. I did try to plug in a mouse to to cancel fastmem detection, but with a mouse connected DiagROM only sends <> to the serial port, and hangs showing a blue screen.

I forgot to mention in my previous post that I have a 24 MHz 8 channel logic analyzer (a cheapo china one) on my bench, and would be happy to do any signal captures on my rev6 board that might help identify the issue...

Is it possible the SMD component sizes fitted by the PCB manufacturer are the wrong size or something (on the underside). eg. resistor arrays, resistors.