MiSTer FPGA Forum

Thanks

For some reason, the famous Easter egg does work in this version of Basic, unlike in the standard version.

D.

After a little bit of fiddling, I managed to hack together a version of the core that runs OSI Basic, and uses the OSI character set. It runs OSI Invaders, showing off the correct characters. At this stage, I made no changes to the screen resolution, and it's running the same monitor as before. It's pretty hilarious that all the characters are reve...

Not just for you I think: https://stardot.org.uk/forums/viewtopic.php?t=13550 (3rd post down and Link in the last one) Wow, there are some pretty hardcore UK101 people on that forum :shock: Meanwhile I have been messing about with the OSI emulator on this site http://osi.marks-lab.com/index.php. It supports the UK101, and several different models ...

Hi DanielB, et al. I really need to find out exactly what the differences were between the UK101 and the OSI machines, and also the differences between the different OSI models, Main differences: Default Screen size: UK101 = 48x16, OSI C1p = 32x32, OSI c2,c3,c4,c8 = 32x32 or 64x32 (Normally 24x24 would be visible with a C1p, as it doesn't account ...

48x32 shouldn't be that hard, I think. As for saving, not sure what's involved. Might be useful if people actually intend to write programs using the core 8-) The idea of writing and saving on old computers, I owned in the past, was one of the reasons I was attracted to Mister as a platform but that aspect has been the biggest letdown for me as it...

Hi DanielB, et al. One thing I have found out is that the OSI machines apparently had a different character set, and that some games written for them don't look right on the UK101 for that reason. Adding a selectable character set should be trivial. VHDL code for the OSI charater set is in the archive I posted earlier (if you want to use it): http...

There are :-) How about a 48x32 mode (it was a common double the Video RAM mod) which would be a useful addition I think. And maybe a way of saving without requiring serial? You could leave the rest for future development if you ever felt like coming back to it. 48x32 shouldn't be that hard, I think. As for saving, not sure what's involved. Might ...

- Floppy disk system. This would be very difficult, at least for me. To do this, you would need precise documentation of the actual interface, and the original DOS ROMS. Some of this does exist for the Superboard, but even so, I suspect this is beyond my FPGA coding skills. There are some disk images on the web for the Superboard, but I don't know...

Hi,

Variable clock speed is now official, including a fix for the key repeat speed.

D.

Compukit UK101:

Added variable CPU clock speed.

Hi,

Yes, this will be fixed in the next release.

D.

New test version with switchable clock speed. Gives speeds between 1 and 10 Mhz. Higher speeds are hilarious. Playing Scramble at 2 or 4Mhz is actually a big improvement.

I want to clean up the code for this a bit before making it official, so it might be a while.

D.

Hi, Well, the core is basically complete, and appears to be working rather well. That said, there are a few expansions that were available for the original kit: - Floppy disk system. This would be very difficult, at least for me. To do this, you would need precise documentation of the actual interface, and the original DOS ROMS. Some of this does ...

Moondandy wrote: ↑Fri Oct 08, 2021 4:45 pm Wow, you've really put a shift in on this, well done getting it so feature filled.

Could this system make use of an RTC or does it predate utilising one?

Thanks!. I've no idea whether one was ever made available as an add-on, but most computers did not have one at this time, or even a few years later.

D.

Hi, Well, the core is basically complete, and appears to be working rather well. That said, there are a few expansions that were available for the original kit: - Floppy disk system. This would be very difficult, at least for me. To do this, you would need precise documentation of the actual interface, and the original DOS ROMS. Some of this does e...

Hi all, I pushed a new version with the 64x32 screen mode to the main repository. To go with this, I am attaching a Scramble game that I downloaded from here: http://osi.vintagecomputers.square7.ch/seite3.html, that runs on a 64x32 screen under Cegmon. It's machine code so load it via the monitor. It's apparently called Super Scramble, by Adventure...

Compukit UK101:

Added 64x32 screen mode.

Hi, Here is a test version with switchable resolution. Unlike the previous incarnation of this feature, switching screen size actually changes the screen resolution and refresh rate, and the display will resync. If you want to avoid this, or if your monitor can't handle the higher refresh rate, you can add [UK101] vsync_adjust=0 to your Mister.ini ...

Hi,

Selectable 64x32 screen in the next version of the core.

It seems to more or less work, but some more testing and debugging is necessary before releasing it into the wild.

D.

Secondly, I have attached a new version of Galactic Hitchhiker. It turns out that the padding I added at the end of the file caused some side effects after a reset. All I really needed to do was to add a carriage return to the end of the file. The attached version appears to work perfectly and has no unwanted side effects. Didn't notice that. Than...

Hi all, I just pushed a new version of the core with one small change - the Load File menu option is now greyed out in UART mode. Secondly, I have attached a new version of Galactic Hitchhiker. It turns out that the padding I added at the end of the file caused some side effects after a reset. All I really needed to do was to add a carriage return ...

Thanks for the help in testing the core. The latest version just "went official".

Compukit UK101:

Load programs from text files.

Here it is. It appears to work fine; I was unable to make it do anything really weird.

One difference is that Super Invaders will now run in File mode, but you still have to select UART and 300 baud to make it work at the correct speed. Not sure what's going on there, but I will investigate if it proves to be a problem.

D.

Apparently... I'll test it some more, and if I can't trip it up, I'll put another pre-release version on the forum.

D.

I seem to have fixed it....

Just an observation that when a text file has finished loading I find I have to press the space bar to get back a flashing cursor and then Return before I can List or Run ect. Additional: Just watch one of your videos and noticed it is normal behaviour :-) Yes, Writing LOAD puts it into "load mode" and it waits for you to upload your pro...

Here's a hint: Super Invaders plays very nicely with a joystick if you redefine the keys. Definitely would have been considered sci-fi in 1979...

D.

I played it right through, following the walkthrough. Some of it is quite funny, but I imagine it would be pretty tedious without the walkthrough

D.

Galactic Hitchhiker This game is, according to this site: https://intfiction.org/t/early-british-text-adventures/46425 possibly the earliest surviving British text adventure game. More details can be found here: http://8bitag.com/info/galactic.html and here: https://stardot.org.uk/forums/viewtopic.php?p=61073#p61073. I downloaded the file from the...