Raven. A homemade Atari-like computer

[agranlund]

Bravo!
Is that a 68060 EC you're running in there? Makes sense at this stage of the development.

Thanks! I cheaped out and use an LC variant.
An MMU is required and is configured by the bios to help the machine be more Atari-like.

It shouldn't be impossible to get MiNT memory protection playing nice with that - but at this stage I still run with mem-protection disabled.
(In fact, I think the kernel when I got the first boot was built completely without MMU support)

[me262]

Very nice work! I love how clean it is on the surface!

I especially like the MicroATX form factor, and the ATX power connector (SFX or TFX power supply maybe? I want to see how small this can get!)! Will this respond to the power button as a push button on/off? Or is there a separate on/off state switch that this will use? What happens with the reset button?

The graphics refresh looks interesting, I wonder how the Bad Apple demo would look on here.

[agranlund]

I especially like the MicroATX form factor, and the ATX power connector (SFX or TFX power supply maybe? I want to see how small this can get!)! Will this respond to the power button as a push button on/off? Or is there a separate on/off state switch that this will use? What happens with the reset button?

Thanks!

The on/off is a press once to toggle between on/off like you have on modern cases.
There's a front-panel connector for hooking it up to the button on the mATX case.

Reset is also exposed in that connector and it does a hard-reset.
I'm thinking for next rev I'll probably expose soft-reset too.

Then there's the normal Power and Disk Activity LED connectors there too.
(and an option to blink the Power led on disk activity if the case only has a single LED)

I have a case where this is going into so it was mostly designed around what that case has - though it's just a normal mATX case.

[Badwolf]

Lovely progress, Anders.

What are the dual MFPs for, just out of interest?

BW

[agranlund]

What are the dual MFPs for, just out of interest?

One is wired up pretty much like on the ST.
Not exactly the same of course but for the most part quite close.

The other one takes care of ISA interrupts.
It also takes care of Midi in lieu of an ACIA - though I'm not 100% sure if it'll stay like that, we'll see later when I get to doing some midi experiments.
Having 4 extra and guaranteed free for whatever I want timers are quite nice too, for behind-the-OS type of things. I'm using one at the moment to generate Vblank signal.
I may end up using one of the timers for DMA-sound emulation, or something of that sort..

[Badwolf]

The other one takes care of ISA interrupts.
It also takes care of Midi in lieu of an ACIA - though I'm not 100% sure if it'll stay like that, we'll see later when I get to doing some midi experiments.
Having 4 extra and guaranteed free for whatever I want timers are quite nice too, for behind-the-OS type of things. I'm using one at the moment to generate Vblank signal.
I may end up using one of the timers for DMA-sound emulation, or something of that sort..

BW

[agranlund]

I think there is a law somewhere stating that all hardware must be able to run Doom.
Thus...



Bottlenecked by access speed to graphics card. But it's expected.

[exxos]

I think there is a law somewhere stating that all hardware must be able to run Doom.
Thus...

[Steve]

So cool!!!

[mikro]

A lot quicker than on CT60!