exxos's Atari, Amiga & retro forum

Badwolf wrote: 24 Sep 2026 15:31 This would have the advantage of being fully 32 bit albeit with the same restriction of being bus-slave only.

I engage in lots of daydreaming :P

That's actually not a bad idea really, just need another connector and another couple of layers of PCB to fit it all then :P

I suppose as the data buses on the small connector, a duplicate connector there for the other 16 bits would probably be the most convenient way of doing it.. Rooting it probably not so convenient...

EDIT:

ohhh look the other side of the databus is sitting right there !

Ah, no I was thinking more about a bolt-on board that wouldn't need mods to the existing design.

Some kind of madcap thing like this with magical routeing of 68 lines through the gaps. :P

I've done it here on the FPU as it has all the lines and fewer pins, but I know DFB1X is SMT for that.

BW

Badwolf wrote: 24 Sep 2026 16:26 Ah, no I was thinking more about a bolt-on board that wouldn't need mods to the existing design.
Some kind of madcap thing like this with magical routeing of 68 lines through the gaps. :P

Good luck with that one :) could probably be done if you push to enough Layers , but that's its own drama.. Probably be cheaper to respin the whole board and start again at that point :P

Meanwhile I'm trying to fit extra connector on for the 32 bit bus :P

For the Mega Videl I’m focusing on the CT60 to have access to the full speed 32 bit wide 68060 bus. Putting it on a copy of the Falcon bus seems overly constrained. So if you do add one it’d be good if it’s a 32-bit 68030 clock speed one.

Anyway no promises on my end, not even sure if I’ll get the CT60 version working.

Design so far is here: https://github.com/scrameta/mega_videl

foft wrote: 24 Sep 2026 17:36 For the Mega Videl I’m focusing on the CT60 to have access to the full speed 32 bit wide 68060 bus. Putting it on a copy of the Falcon bus seems overly constrained. So if you do add one it’d be good if it’s a 32-bit 68030 clock speed one.
Anyway no promises on my end, not even sure if I’ll get the CT60 version working.
Design so far is here: https://github.com/scrameta/mega_videl

Interesting stuff ! The databus is driven from the CPU. I guess I could pipe the CPU clock to the connector but its going to be clock switching. The master osc could be done but thats going to be a few ns in front of the CPU clock. The firmware would likely need updating to make sure the CPU is running 50mhz by whatever is fitted. But that's not a huge issue anyway.

exxos wrote: 24 Sep 2026 18:28 Capture.PNG

:o

Are you snaking A24-31 down there too?

exxos wrote: 24 Sep 2026 16:31 Good luck with that one :) could probably be done if you push to enough Layers , but that's its own drama.

Of course I could just do it as a plug-in to the FPU slot. Duh. :P

BW

foft wrote: 24 Sep 2026 17:36 For the Mega Videl I’m focusing on the CT60 to have access to the full speed 32 bit wide 68060 bus.

Have kept half an eye on your work but not being fully au fait with the 060 I guessed it wouldn't be backwards portable.

But all the very best :)

BW

Badwolf wrote: 24 Sep 2026 19:02 Are you snaking A24-31 down there too?

Yep working on that now.

I'm going to reorder the layout of that bottom socket so things just flow better..

exxos wrote: 24 Sep 2026 16:31 Of course I could just do it as a plug-in to the FPU slot. Duh. :P

:lol: :roll:

Those SMT sockets are a bit too fragile to mess with :( I want to get some metal braces to clamp around those sockets but getting them the right size is another matter... I was trying to look around to see if there was any more meaty SMT style sockets but they all seem to be basically the same :(

High address lines now rooted to the connector :)