Raven. A homemade Atari-like computer

[PhilC]

I chased more red herrings than I care to admit today, but in the end I did find a more or less suitable location to hijack Nova VDI's scroll routine for VT52 console. Cirrus and WDC cards are now scrolling it quite fast with the blitter :)

Oh that's good, when viewing addresses on Mon.TOS it was painfully slow.

Gembench results compared to an STFM with the Raven@640x580x256 and with the GD5429 ram at 83mhz are getting amusing.

PXL_20250824_122652353.jpg

[mrbombermillzy]

Gembench results compared to an STFM with the Raven@640x580x256 and with the GD5429 ram at 83mhz are getting amusing.

Ahem! Tut-tut. :lol: (Got you back!)

Seriously though, its looking like the Raven can realistically be able to run GEM/VDI output games.

You should try running the Shadow of the Beast GEM demo on it. :)

[PhilC]

@mrbombermillzy Oh I know my typing is bad :P

I'll see if I can find the demo and try it.

[mrbombermillzy]

I think its in here Phil:

vdi_fx11_68k.zip

[PhilC]

I think its in here Phil: vdi_fx11_68k.zip

Yes it seems to run that and most of the others quite happily too.

[mrbombermillzy]

I think its in here Phil: vdi_fx11_68k.zip

Yes it seems to run that and most of the others quite happily too.

On a regular 68000 Atari it runs very slowly. (IIRC 1-3 FPS).

[agranlund]

Uploaded a new release zip based on latest code.
https://github.com/agranlund/raven/rele ... A1.latest

I think the main point of interest is the graphics driver.
(you'll need to update the rom for the rvnova vga driver to work)

Code: Select all

20250827:
  rom:      updated to EmuTOS 1.4
  rom:      x86 emulation bugfix
  rvnova:   Cirrus Logic GD54xx driver (blitter support)
  rvnova:   WDC90C31 driver (blitter support)
  rvnova:   OAK driver

[agranlund]

And updated again with a temporary workaround for SDL picking the wrong resolution (thanks for noticing that @PhilC !)
https://github.com/agranlund/raven/rele ... .A1.latest

The only file updated since last post is c:\nova\default\auto\sta_vdi.bib

For now, I just removed the 320x200x16bpp resolution since SDL appears to pick that over the 8bpp variant when both are available -- I'll take a look at the SDL side a bit later.
This issue was only seen with the 'default' driver since the resolution lists for the other ones had only 8bpp for 320x200 already.

[luciodra]

I did not quite understand if and which update must be used.

Screenshot_28-8-2025_81558_github.com.jpeg

[agranlund]

Yeah sorry I should get rid of that topmost unnumbered changes descriptions — now that you mention it I realize it probably doesn’t belong in that file.

I kept track of work in progress stuff under the xxxxxxx description until being included (or not) in a proper numbered release.

So in this case, there is no new changes to firmware in the 250827 release package.