MiSTer FPGA Forum

Compukit UK101

- Selectable memory size - options are 4K, 8K, 32K and the maximum approx. 41K.
- Fixed keyboard auto-repeat rate at high clock speeds for OSI machine (Cegmon only).

Out of interest do you think Superboard would work with WEMON (has more features)? Watford Electronics wrote it to, but you never know Hi, The Wemon that I have is set up for a UK101 at 48x16. For it to work on an OSI, it would at least need to be patched for the different screen size. I have the Wemon manual; maybe the information is in there on ...

Hi, I managed to get 24x24 mode working. In the version that I have at the moment, it replaces the 32x32 mode on the OSI machine, and basically only works with Cegmon, because Cegmon is the only monitor that I know how to patch to change the default screen settings. So, is there any point to adding it to the official version? Every game is written ...

Fun fact: it seems that if you tell the system at startup that it has memory of a certain size, it will believe you and not bother counting it. Therefore you can tell a 4K system that it has 8K, and all will be well until it actually tries to access memory that it doesn't have. "PRINT FRE(0)" will give wrong results based on the amount of...

Hi all, Here is a new test version with variable memory sizes. You can switch between 4K,8K,32K and the maximum 41K. D. This is great! I'm trying it now. Thank you :-) Could you try this version too? The first one was a little overengineered, which resulted in an unnecessarily large core. This one should behave in exactly the same way as the first...

Hi all,

Here is a new test version with variable memory sizes. You can switch between 4K,8K,32K and the maximum 41K.

D.

That's how it's supposed to work (or at least, how I intended it to work). MonUK02 and Wemon only work in low resolution. When you select them, low resolution is selected for you automatically and the menu item is greyed out. When you select the other monitors, the resolution menu is reenabled. In any case, always reset after selecting a new monito...

For some reason, the update script did not pick it up on my MiSTer, even though I can see the release file in the repository, and it is listed in the Wiki. Did it work for anyone?

I pushed a new version with fixed resolution selection.

Getting the menu right is one of the most difficult parts of the whole project. This version actually has a separate monitor menu for each machine type, but only displays one at a time, and lots of conditions for greying out of menu items.

Please let me know if there are any more bugs.

D.

EeDee wrote: ↑Sun Oct 24, 2021 10:17 pm While in UK101 mode I can't select low resolution for some Monitors as that selection is greyed out

I know. I have a fix for that which I will push tomorrow. Meanwhile, select Cegmon, low-res, and then the monitor that you want.

D

- I'm not sure if this is a bug. I noticed this after watching a YT video linked below. After you press C then A for Memory Size you should get a message that says "This is the COMPUKIT UK101" On the MiSTer "is is the COMPUKIT UK101" https://www.youtube.com/watch?v=aD844aXw9z8 Around :35 Hi, I am resurrecting this post because ...

Hi all,

I pushed the new version with the two new monitor ROMs; Wemon for UK101 and Synmon for OSI.

D.

Compukit UK101

Added two new monitor ROMs: Wemon for UK101 and Synmon for OSI.

That's brilliant. For me, at least, one of the most interesting aspects of the MiSTer is that way that keeps these rather obscure old computers alive.

It looks like someone really put a lot of work into porting all those Spectrum games, or was it made to be Spectrum compatible?

D.

I got Synmon600 to run. For the C2 and C4, it's identical to Synmon1, according to: https://www.osiweb.org/software.html. For some reason, Asteroids runs perfectly under Synmon. As for Wemon, either it's really buggy, or it is equally badly set up on the core and the emulator. Lots of stuff doesn't work on either of them. The next release will have...

I managed to get Wemon working.

Seems to work, but so far, I have been unable to load machine code games using it, but the emulator behaves in exactly the same way...

D.

Yes, also here: https://osiweb.org/misc/OSI_ROM_routines.txt

D.

From CEGMON manual "To save on cost, OSI's SYNMON 2K monitor chip actually contains monitors for several different machines , and only a meagre 3/4K is used for each type" Any use? Hi, yes I've found the information on how the Synmon ROM is mapped. Like so many things on this computer, you couldn't make it up. :shock: So far, I've been a...

I have also been comparing compatibility with the emulator, and on the whole I think the core holds up pretty well. There are a couple of games that don't work, like Caterpillar and Ridge Cruiser, and I'd really like to understand why. I did find an Invaders game that will only load under Synmon, which the core doesn't have, and it got me wonderin...

That's weird... I have also been comparing compatibility with the emulator, and on the whole I think the core holds up pretty well. There are a couple of games that don't work, like Caterpillar and Ridge Cruiser, and I'd really like to understand why. I did find an Invaders game that will only load under Synmon, which the core doesn't have, and it ...

EeDee wrote: ↑Thu Oct 21, 2021 8:15 am

danielb wrote: ↑Wed Oct 20, 2021 9:56 pm Add a carriage return to the end of the file. It will then clear the screen, say "Hit p to start" and freeze.

D.

Yes it does
Any idea what is involved in getting it to load archived files?

What kind of archive?

D

The only game that does work on the emulator, and should, as far as I know, work on the core, but doesn't, is Caterpillar. Not sure what's going on there... At the end of data input it just stops. If you press the space bar you can make out HIT P TO START but that's about it Add a carriage return to the end of the file. It will then clear the scre...

I've been trying the WinOSI Emulator. Feature rich or what?! It's great! Much prefer the Mister version though for some reason or other ;-) Thanks again. I'm going to give it a try now It's great for giving an idea of what's possible and how it should work. I was very happy to see that a couple of games that don't work on the core, don't work on t...

Hi, OSI mode is now "official". In addition to this, input files may now have the .bas and .lod extensions, which seem to be fairly standard for Basic and machine code programs. @Eedee: I was wondering what the Multicomp was based on, although it seems to be a less precise simulation than the UK101-specific one. The Z80 Multicomp is appar...

Compukit UK101

- Added OSI mode to support an Ohio Scientific computer in addition to the UK101.
- Input files may have .bas and .lod extensions, as well as .txt.

Hi,

Here's another pre-release version. This one adds selectable screen resolution in the OSI mode.

D.

Hi, Here is another pre-release version. This one allows switching between UK101 and OSI machines. Compatibility with UK101 games seems to be the same as before. Tested OSI games include Galaxia, Pacdude, OSIInvaders, SuperDefender, Universe, TimeTrek, Pinball and OSI Grand. Caterpillar and RidgeCruiser do not work. NightRider seems to work with g...

Hi all,

I managed to get 32-column mode to work. Not quite ready for the big time yet, but coming soon.

Using the same principle, I could add other resolutions, like 32x16 (already working...), 48x32 or whatever. Is there any use for these?

D.

Hi, Here is another pre-release version. This one allows switching between UK101 and OSI machines. Compatibility with UK101 games seems to be the same as before. Tested OSI games include Galaxia, Pacdude, OSIInvaders, SuperDefender, Universe, TimeTrek, Pinball and OSI Grand. Caterpillar and RidgeCruiser do not work. NightRider seems to work with gl...

After a bit more fiddling, I managed to get one of the OSI ROMs to work. It seems to default to 64x32 characters. I haven't yet attempted to change this, although I did tweak the video output a bit to get a 60hz refresh rate. Not sure if this actually matters or not. Anyway, almost all of the OSI-specific games that I tested now work. I have attach...