MiSTer FPGA Forum

Hi,

I made a version which defaults to high res, and this seems to work better. OSI Invaders and Pacdude both start off in high res and switch to low, and Defender switches to low before it starts. The emulator also defaults to high res, so that is what the release version will do.

D.

Hi, This test version has software control over screen resolution. To see it work: Choose OSI C2P, then set resolution to auto. It will default to low res. Reset, to make sure the display variables are set properly. POKE 56832,1 sets high res, POKE 56832,0 sets it back to low res. Games which support this are OSI Invaders (the C2P version) and Pacd...

Hi,

I managed to get the automatic resolution switching to work in the C2P mode, so OSI Invaders is now an authentic C2P experience

I'll post a development version after I clean up the GUI, which always takes longer than the actual development...

D.

Hi,

I received permission to redistribute the OSI C1P version of OSI Invaders from its rescuer, Timothy Musson, so here it is.

D.

Thanks, I think it might be nice to have software control over screen mode. Maybe, for the C2P, I should have "High/Low/Auto", which would be the best of both worlds. Anyway, I was given access to the C1P version of OSIInvaders. It works very well on the core, and I even fixed it a bit, to get rid of a syntax error in the middle of loadin...

EeDee wrote: ↑Mon Nov 22, 2021 9:29 pm

danielb wrote: ↑Mon Nov 22, 2021 7:03 pm
Maybe it peeks or pokes some hardware register that isn't supported in the core ...

D.

Dunno

I have PRG files. Could PRG also be made loadable?

No idea. On other systems, prg files are binary files that are injected directly into memory. Could you send me one so I can see what it is?

Unfortunately I get "Access Denied" when I try to download it. D. Seems you have to request a download **The problem of getting Caterpillar to run seems to persist** Hi, Yes, I asked for access to the file. Caterpillar is the only game that I can think of off-hand that doesn't run. I still have no idea why. Maybe it peeks or pokes some h...

Another question occurs to me: Did the OSI machines have an external switch of some kind for changing screen mode (analogous to the menu option in the core) or was screen mode only controlled from software?

If the latter is true, then the core should really do the same for accuracy's sake.

D.

Thanks. I might have to do something about that...

D.

One question about OSI Invaders. On WinOSI, the text intro appears to be in 64-column mode, and then it seems to switch to 32 column mode for the game itself. Could the OSI machines auto switch screen mode? Also, there appears to have been a C1P version of OSU invaders: https://trmusson.dreamhosters.com/c1p.html Unfortunately I get "Access Den...

Hi,

To run OSI Invaders, go into C2P mode, then do a cold reset and start Basic, then do another reset, press "M" for the monitor, and load it.

This works on the new version of the core, the old version, WinOSI, and, I believe, the original hardware.

D.

Hi, The new version with the OSI C1P mode is now official. I found and fixed a couple of GUI bugs since I posted the development version. The OSI C1P, as I understand it, is actually identical to the Superboard II, which is the OSI machine that the Compukit UK101 was based on/ripped off from. Also, this video gives a good demonstration of the C1P a...

Compukit UK101

- Added OSI C1P/Superboard II mode.

Hi, Here is a new test version. There are now three machine types: UK101, OSI C2P and OSI C1P. The last currently only runs Cegmon. Its screen is a 32x32 matrix, of which only the central 24x24 are in use. This is why games written specifically for it won't display properly on other systems. A few games which didn't work before now run, such as Rid...

Hi, C1P mode now appears to be working, at least partially. It took me a while to work out the different screen addressing mode, hence the two deleted messages from yesterday. Anyway, we now have Ridge Cruiser, and also a new C1P-specific monitor, which I don't recognise. I "borrowed" it from the WinOSI source code package, where it is ca...

Sorry. Deleted again.
I wish there was some way to delete a post in this forum.

Deleted for now.

Just a little update: I'm working on a new mode, for the OSI C1P.

I have had some moderate success, but it will be a while before it is ready for testing.

D.

PS. I will also take a look at saving over UART

I tried this core for the first time yesterday.

It seems to work great. I knew nothing at all about this machine beforehand, so thanks for bringing another obscure (to me) system to MiSTer!

D.

Hi,

I finally managed to get this core to run on my MiSTer with HDMI.

It seems to work at 1080p, but not at 1440p.

Anyway, it's nice to get acquainted with another computer that I'd never heard of before, so thanks to everyone who worked on it.

D.

EeDee wrote: ↑Mon Nov 15, 2021 7:37 am

danielb wrote: ↑Sat Nov 13, 2021 10:00 am Hi,

I just pushed a new official version.

This one has the fixed Scandoubler code, and also a rearranged menu.

D.

Nice to see the improvements are still coming. Thanks.
I'm still holding out for a Saving via UART fix

I will definitely take a look at that soon...

D.

Hi,

I just pushed a new official version.

This one has the fixed Scandoubler code, and also a rearranged menu.

D.

Compukit UK101

- Scandoubler now works.
- Rearranged menu to group related items together.

Hi Danielb, et al. Here's a little progress update: I have not been working on the core quite as intensively as before. It is quite functional and I have other stuff that needs attention. However, I have been continuing to faff about with the video. In my latest development version, the scandoubler works properly, and I have been testing it with a...

Here's a little progress update: I have not been working on the core quite as intensively as before. It is quite functional and I have other stuff that needs attention. However, I have been continuing to faff about with the video. In my latest development version, the scandoubler works properly, and I have been testing it with a VGA screen. This wo...

EeDee wrote: ↑Wed Nov 10, 2021 10:16 am

danielb wrote: ↑Wed Nov 10, 2021 10:02 am I'll take a look at it. I haven't tried it for a very long time.

Thanks
Is that how it feels?

Relatively speaking...

D.

I'll take a look at it. I haven't tried it for a very long time.

The Sol-20 seems like something one of the several devs who work on old computer cores would be interested in, I assume all the parts in it are already in other cores so may not be too difficult at this stage, that site has a lot of docs on there, and it also seems to have something of a fan base if that site is to go by. This seems to be very sim...

Thanks, You're making a lovely job of this core :-) Anything else in mind ;-) For this version, just details. I think it's mostly finished. Some enhancements only work with Cegmon. I recently found this repository: https://github.com/sjgray/OSI-monitor-roms , where someone has been reconstructing the source code for the various OSI ROMS. Hopefully...

The selectable memory size is now "official". I also fixed the keyboard autorepeat rate for OSI Cegmon at high clock speeds.

D.