Steve's DFB1 build

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Steve
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Re: Steve's DFB1 build

Post by Steve »

Ohhh thank you FedEx!

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Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Steve's DFB1 build

Post by Steve »

Okay but now I've broken my CPU.

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frank.lukas
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Joined: Fri Jan 19, 2018 11:52 am

Re: Steve's DFB1 build

Post by frank.lukas »

.. you can solder new pins. That's enough to set up the CPU once.
Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Steve's DFB1 build

Post by Steve »

It's okay I got a spare :)

By the way before I test, @Badwolf I'm getting 21 ohms across vcc and gnd, would that be correct? CPU inserted etc.

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Steve
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Re: Steve's DFB1 build

Post by Steve »

And just want to double check that I've got the Xtal installed correctly :)

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Badwolf
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Re: Steve's DFB1 build

Post by Badwolf »

Steve wrote: Wed Apr 20, 2022 12:29 pm By the way before I test, @Badwolf I'm getting 21 ohms across vcc and gnd, would that be correct? CPU inserted etc.
Whilst plugged into the Falcon? Seems reasonable. I could have even been persuaded it would be lower.

BW
DFB1 Open source 50MHz 030 and TT-RAM accelerator for the Falcon
DSTB1 Open source 16Mhz 68k and AltRAM accelerator for the ST
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
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Badwolf
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Joined: Tue Nov 19, 2019 12:09 pm

Re: Steve's DFB1 build

Post by Badwolf »

Steve wrote: Wed Apr 20, 2022 12:30 pm And just want to double check that I've got the Xtal installed correctly :)
Yep. Pin one top right. Tiny silkscreen says "Oscillator this way -->" ;)

BTW, if you can, I prefer to test in RGB or Composite mode (versus VGA) as most tellys will react faster to the signal coming on than VGA screens (which tend to need to wake up).

Could potentially save 5 or 6 seconds of power if something's not right.

Remember you need to jumper the flash disable and, if I were you, I'd jumper the master disable on first power up: make sure you see the Atari logo from the on-board processor before trying the external one.

BW
DFB1 Open source 50MHz 030 and TT-RAM accelerator for the Falcon
DSTB1 Open source 16Mhz 68k and AltRAM accelerator for the ST
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
Steve
Posts: 2570
Joined: Fri Sep 15, 2017 11:49 am

Re: Steve's DFB1 build

Post by Steve »

@Badwolf

I'm getting this:
(Diag cart in)

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Badwolf
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Re: Steve's DFB1 build

Post by Badwolf »

Firstly, is this with the master enable jumpered or open?

If jumpered, reseat both board and diag cart.

If open, does jumpered work?

BW
DFB1 Open source 50MHz 030 and TT-RAM accelerator for the Falcon
DSTB1 Open source 16Mhz 68k and AltRAM accelerator for the ST
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
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