DFB1r3 dev board demonstration video

[JezC]

Very nice...I'd be interested in a version of this if/when you're in a position to consider making or selling these.

:goodpost: :bravo: :thumbup:

[Badwolf]

By the way, I mentioned in the video that I was experimenting with adding an FPU to the board. It doesn't work for me, alas.

It's recognised and under TOS the FRAC.DSP program will draw its Mandelbrot, but GB6 will crash. Under EmuTOS it's an exception on both.

I've a suspicion I've pushed my particular brand of firmware about as far as I can. I'm getting some odd fitting errors and any little tweak seems to break timing now despite vast swathes of macrocells being available. More work is needed there & therefore timing may be the problem.


In terms of wiring, I've:

• All 32 data lines connected

• DSACK[1:0] are connected direct and converted to open drain with 2k2 pullups

• A[4:1] connected to the address bus

• Clock, reset, RW, AS and DS bridged

• Chip Select being the only derived signal based on

  Code: Select all

  &FC & ( A[19:16] == 4'b0010 ); // co-processor decode

Sound about right?

BW

[exxos]

• Chip Select being the only derived signal based on

  Code: Select all

  &FC & ( A[19:16] == 4'b0010 ); // co-processor decode

TF536 has

Code: Select all

wire FPUOP = CPUSPACE & ({A[19:16]} === {4'b0010});

So looks right to me :)

[Reylan]

Hello,
I was wondering if it would be possible to stack the dfb1 on top is a ct60e.
To give a fully compatible and fast 68030 and a 68060.
Just to know 😊

[Badwolf]

Hello,
I was wondering if it would be possible to stack the dfb1 on top is a ct60e.
To give a fully compatible and fast 68030 and a 68060.
Just to know 😊

Haha, I doubt it!

BW

[Badwolf]

TF536 has

Code: Select all

wire FPUOP = CPUSPACE & ({A[19:16]} === {4'b0010});

So looks right to me :)

Cheers.

Been away for a week so will likely come back to this later this week. Suspecting possibly dodgy fly-leads, TBH.

BW

[MegaSTEarian]

Any update on this wonderful project?

[Badwolf]

Yeah, sorry, not a lot for a number of reasons.

• I've been a way for a bit.
• I've been experimenting with other things.
• Cricket season has started so my weekends aren't as available.
• The FPU hat didn't work 'out of the box' and I hit a dead-end firmware-wise trying to make it so.

I've started work on rebuilding the firmware as it's *really* inefficient at the moment. I thought about porting the TF330 source as a starter but it doesn't really have much in common with the Falcon's architecture so would likely end up being mostly my code. The TF536 is closer, but it's not open. I might try a bastardised combination TF534 and TF330 and see where I get.

Basically I want a new, more efficient, more reliable firmware before I move back the FPU and rev4.

Cheers for chasing me up, though. :)

BW

[MegaSTEarian]

Cheers, thanks for the update.