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 (330.1 KiB) Viewed 1146 times

[mrbombermillzy]

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

Ahem! Tut-tut. (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

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

[mrbombermillzy]

I think its in here Phil:

vdi_fx11_68k.zip

(270.27 KiB) Downloaded 19 times

[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 (27.36 KiB) Viewed 930 times

[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.