Robotron KC87 core port

Slein
Posts: 32
Joined: Tue Jul 07, 2020 8:19 am
Has thanked: 4 times
Been thanked: 13 times

Robotron KC87 core port

Unread post by Slein »

Hello everyone,

i ported this Robotron KC87 core to the MiSTer platform.
Its usable, but not a finished product yet.

Don't get your hopes to high though, its a basic system without much graphics capabilities.
No pretty games like on C64 or other contemporary computers.

Made in GDR/DDR/East Germany in the later half of the 80ies it is based on the U880/Z80 CPU,
has 16kb RAM + expansion module, a truly terrible keyboard and a metal case.
Some info and pictures at Wikipedia.

As of now the core lacks tape input , *.TAP support and audio output. There is not much software available, it was a somewhat
less loved little stepbrother of the KC85/x series. But theres a core for those too waiting for a port, my next project.
Tape support/audio/better MiSTer integration are on my todo list for later.
Video output on HDMI works for me at a little over 50Hz, i have no way of testing analog video and don't expect it to work.

There is a Basic interpreter in ROM, type BASIC at the OS prompt to start it.
Basic comands are the usual RUN/LIST/EDIT XY (line number).
I don't know much more about using this computer.

Sources and a precompiled .rbf are available at github.
User avatar
tontonkaloun
Posts: 307
Joined: Sun May 24, 2020 7:38 pm
Has thanked: 14 times
Been thanked: 20 times

Re: Robotron KC87 core port

Unread post by tontonkaloun »

Hello,

Thank you so much

I love all these machines from the Soviet bloc, they're often surprising.
User avatar
tontonkaloun
Posts: 307
Joined: Sun May 24, 2020 7:38 pm
Has thanked: 14 times
Been thanked: 20 times

Re: Robotron KC87 core port

Unread post by tontonkaloun »

Thank you for your new core : kc854_20210218
Slein
Posts: 32
Joined: Tue Jul 07, 2020 8:19 am
Has thanked: 4 times
Been thanked: 13 times

Re: Robotron KC87 core port

Unread post by Slein »

Its not really ready yet, just a quick backup to github.

I starting working on tape support for both cores last night to really see if things are working with software.

Nice to see someone enjoying the old iron :)
User avatar
Alkadian
Posts: 299
Joined: Thu May 28, 2020 9:55 am
Has thanked: 48 times
Been thanked: 15 times

Re: Robotron KC87 core port

Unread post by Alkadian »

Vey cool machine, I love discovering new computers I wasn't aware of!

I have just lunched it to see how it looks like.
Slein
Posts: 32
Joined: Tue Jul 07, 2020 8:19 am
Has thanked: 4 times
Been thanked: 13 times

Re: Robotron KC87 core port

Unread post by Slein »

I added TAP file support to the core, but now its obvious that things are running a little fast. One more thing for the todo list..

There is more info on how to convert/use TAP files on github.

Its pretty crazy to see how sloow tapes really were back then:
User avatar
tontonkaloun
Posts: 307
Joined: Sun May 24, 2020 7:38 pm
Has thanked: 14 times
Been thanked: 20 times

Re: Robotron KC87 core port

Unread post by tontonkaloun »

Slein wrote: Mon Feb 22, 2021 4:01 pm I added TAP file support to the core, but now its obvious that things are running a little fast. One more thing for the todo list..

There is more info on how to convert/use TAP files on github.

Its pretty crazy to see how sloow tapes really were back then:
A big thank you !!!
User avatar
Alkadian
Posts: 299
Joined: Thu May 28, 2020 9:55 am
Has thanked: 48 times
Been thanked: 15 times

Re: Robotron KC87 core port

Unread post by Alkadian »

Slein wrote: Mon Feb 22, 2021 4:01 pm I added TAP file support to the core, but now its obvious that things are running a little fast. One more thing for the todo list..

There is more info on how to convert/use TAP files on github.

Its pretty crazy to see how sloow tapes really were back then:
Great, thanks! Something new to play with! :mrgreen:

Ahh! I see now the meaning of "grab some coffee and/or watch the disk led blinking" :D
User avatar
tontonkaloun
Posts: 307
Joined: Sun May 24, 2020 7:38 pm
Has thanked: 14 times
Been thanked: 20 times

Re: Robotron KC87 core port

Unread post by tontonkaloun »

@Slein
Thank's for the new version of KC87
User avatar
Chris23235
Posts: 274
Joined: Sun May 24, 2020 8:45 pm
Has thanked: 4 times
Been thanked: 12 times

Re: Robotron KC87 core port

Unread post by Chris23235 »

Many thanks, I am looking forward to tap support so that I can have a look at the software available on the system. I always wanted to look at both KC series emulators for a while now, but never did it.
Slein
Posts: 32
Joined: Tue Jul 07, 2020 8:19 am
Has thanked: 4 times
Been thanked: 13 times

Re: Robotron KC87 core port

Unread post by Slein »

I suggest you wait a little longer. There are more nice games than i had thought and the cores really don't do them justice in their current state.

The experience will get better as i learn more about the systems and how to implement them. :)
Slein
Posts: 32
Joined: Tue Jul 07, 2020 8:19 am
Has thanked: 4 times
Been thanked: 13 times

Re: Robotron KC87 core port

Unread post by Slein »

I found the speed problem, the original author already implemented a turbo mode and i failed to understand it. Now its switchable in the osd.
There is sound output too now, tape noise can be turned on in the osd.

The games are now playable at close to the real speed and in all their glory :)
There might still be problems or errors though.
User avatar
wark91
Posts: 105
Joined: Sun May 24, 2020 8:34 pm
Has thanked: 13 times
Been thanked: 5 times

Re: Robotron KC87 core port

Unread post by wark91 »

Thank you Slein !
User avatar
Alkadian
Posts: 299
Joined: Thu May 28, 2020 9:55 am
Has thanked: 48 times
Been thanked: 15 times

Re: Robotron KC87 core port

Unread post by Alkadian »

Slein wrote: Thu Feb 25, 2021 7:26 am I found the speed problem, the original author already implemented a turbo mode and i failed to understand it. Now its switchable in the osd.
There is sound output too now, tape noise can be turned on in the osd.

The games are now playable at close to the real speed and in all their glory :)
There might still be problems or errors though.
Great, I will test the new release shortly!
Thanks!
User avatar
tontonkaloun
Posts: 307
Joined: Sun May 24, 2020 7:38 pm
Has thanked: 14 times
Been thanked: 20 times

Re: Robotron KC87 core port

Unread post by tontonkaloun »

Slein wrote: Thu Feb 25, 2021 7:26 am I found the speed problem, the original author already implemented a turbo mode and i failed to understand it. Now its switchable in the osd.
There is sound output too now, tape noise can be turned on in the osd.

The games are now playable at close to the real speed and in all their glory :)
There might still be problems or errors though.
Thank you Slein
User avatar
tontonkaloun
Posts: 307
Joined: Sun May 24, 2020 7:38 pm
Has thanked: 14 times
Been thanked: 20 times

Re: Robotron KC87 core port

Unread post by tontonkaloun »

Hello

Thank you for your Core Arcade "PolyPlay_20210303"
I wouldn't even have imagined that there might have been arcade machines in East Germany :)
User avatar
Alkadian
Posts: 299
Joined: Thu May 28, 2020 9:55 am
Has thanked: 48 times
Been thanked: 15 times

Re: Robotron KC87 core port

Unread post by Alkadian »

tontonkaloun wrote: Wed Mar 03, 2021 3:52 pm Hello

Thank you for your Core Arcade "PolyPlay_20210303"
I wouldn't even have imagined that there might have been arcade machines in East Germany :)
@tontonkaloun,

Well spot it! I didn't notice this new core at all!

@Slein,

Thanks for that, as I keep saying I just love exploring new machines :mrgreen:
Slein
Posts: 32
Joined: Tue Jul 07, 2020 8:19 am
Has thanked: 4 times
Been thanked: 13 times

Re: Robotron KC87 core port

Unread post by Slein »

Some games on the PolyPlay are real fun to play!

I'm trying to get a KC85/x to find out why the joystick doesn't really work on the KC85/4 core. So far the first seller on Ebay let me down cause the price was too low (damaged while packing...). Maybe i will find another for a good price.
User avatar
tontonkaloun
Posts: 307
Joined: Sun May 24, 2020 7:38 pm
Has thanked: 14 times
Been thanked: 20 times

Re: Robotron KC87 core port

Unread post by tontonkaloun »

Alkadian wrote: Wed Mar 03, 2021 4:07 pm
tontonkaloun wrote: Wed Mar 03, 2021 3:52 pm Hello

Thank you for your Core Arcade "PolyPlay_20210303"
I wouldn't even have imagined that there might have been arcade machines in East Germany :)
@tontonkaloun,

Well spot it! I didn't notice this new core at all!

@Slein,

Thanks for that, as I keep saying I just love exploring new machines :mrgreen:
Hello
Attachments
PolyPlay_20210303.rar
(897.42 KiB) Downloaded 1 time
Slein
Posts: 32
Joined: Tue Jul 07, 2020 8:19 am
Has thanked: 4 times
Been thanked: 13 times

Re: Robotron KC87 core port

Unread post by Slein »

Or post a link to the forum post i made a little later: https://misterfpga.org/viewtopic.php?f=25&t=2172 :)
Theres a link to the github repository, the current rbf (and possible updates) is in the release folder.
User avatar
Alkadian
Posts: 299
Joined: Thu May 28, 2020 9:55 am
Has thanked: 48 times
Been thanked: 15 times

Re: Robotron KC87 core port

Unread post by Alkadian »

tontonkaloun wrote: Wed Mar 03, 2021 5:40 pm
Alkadian wrote: Wed Mar 03, 2021 4:07 pm
tontonkaloun wrote: Wed Mar 03, 2021 3:52 pm Hello

Thank you for your Core Arcade "PolyPlay_20210303"
I wouldn't even have imagined that there might have been arcade machines in East Germany :)
@tontonkaloun,

Well spot it! I didn't notice this new core at all!

@Slein,

Thanks for that, as I keep saying I just love exploring new machines :mrgreen:
Hello
Hello! Thanks for sharing the file!

I have also noticed that Slein made a separate post to announce his new core.
Post Reply