Atari 2600 / VIC 20

https://github.com/mist-devel/mist-board/wiki

Moderators: Mug UK, Zorro 2, Greenious, spiny, Moderator Team

Lroby74
Captain Atari
Captain Atari
Posts: 161
Joined: Sun Sep 04, 2016 8:35 pm

Re: Atari 2600 / VIC 20

Postby Lroby74 » Fri Feb 15, 2019 10:53 pm

slingshot wrote:Yes


Did it, thank you!

Now it's time to create C16.ROM :)

User avatar
DrOG
Atari Super Hero
Atari Super Hero
Posts: 670
Joined: Sun Jul 31, 2016 8:23 pm
Location: Gyula, Hungary

Re: Atari 2600 / VIC 20

Postby DrOG » Sun Mar 10, 2019 6:41 pm

Hi!

This weekend I noticed that the video out of the Atari 2600 core shows some colors wrongly in case of PAL ROMs if scanlines are set to 25 or 50%. Usually I connect my MiST over SCART to the display, but this time tried component. Over VGA (only NTSC ROMs are compatible with my TV using this connector) no such decoloration, but scanlines are barely visible over blue background. See attachments taken from Seaquest.

Cheers: Gábor
You do not have the required permissions to view the files attached to this post.

slingshot
Atari God
Atari God
Posts: 1340
Joined: Mon Aug 06, 2018 3:05 pm

Re: Atari 2600 / VIC 20

Postby slingshot » Tue Mar 12, 2019 9:01 am

The reduced scanline modes are discarding some bits from the RGB output, and sometimes it can transfer to some different colors, as I see. Will check once...

User avatar
DrOG
Atari Super Hero
Atari Super Hero
Posts: 670
Joined: Sun Jul 31, 2016 8:23 pm
Location: Gyula, Hungary

Re: Atari 2600 / VIC 20

Postby DrOG » Tue Mar 12, 2019 1:16 pm

slingshot wrote:The reduced scanline modes are discarding some bits from the RGB output, and sometimes it can transfer to some different colors, as I see. Will check once...

Thank you in advance! Not urgent at all, I use mainly SCART connector in case of my main screen as it's very picky in aspect of non-standard resolutions/refresh rates over VGA as mentioned earlier.

Lroby74
Captain Atari
Captain Atari
Posts: 161
Joined: Sun Sep 04, 2016 8:35 pm

Re: Atari 2600 / VIC 20

Postby Lroby74 » Tue Apr 02, 2019 10:19 am

A friend of mine (Antonino or Nino for friends Porcino) started very recently to study Verilog and VHDL, and added in the Vic20 core the ability to read an audio file (for now) from the Mistica EAR port, his goal would be to become expert enough to add full support for TAPs (including the various Datasette keys) in the C64 core.

He released a small demonstration video:
https://www.facebook.com/groups/2955017 ... 625401460/
Last edited by Lroby74 on Fri May 03, 2019 8:26 am, edited 1 time in total.

User avatar
DrOG
Atari Super Hero
Atari Super Hero
Posts: 670
Joined: Sun Jul 31, 2016 8:23 pm
Location: Gyula, Hungary

Re: Atari 2600 / VIC 20

Postby DrOG » Tue Apr 02, 2019 12:41 pm

Lroby74 wrote:A friend of mine started very recently to study Verilog and VHDL, and added in the Vic20 core the ability to read an audio file (for now) from the Mistica EAR port, his goal would be to become expert enough to add full support for TAPs (including the various Datasette keys) in the C64 core.
He released a small demonstration video:
https://www.facebook.com/groups/2955017 ... 625401460/

It would be really nice! Mistica's EAR port can be easily reproduced on a daughterboard for the MiST (in fact I believe Mistica utilized the original schematic of V6Z80P, as they are the same - BC846 is the SMD version of BC548, see attachments).

We recently try to modify the original circuit to accept lower signal levels (perhaps line-in voltages as well), see details in another topic:
viewtopic.php?f=115&t=30124
You do not have the required permissions to view the files attached to this post.

slingshot
Atari God
Atari God
Posts: 1340
Joined: Mon Aug 06, 2018 3:05 pm

Re: Atari 2600 / VIC 20

Postby slingshot » Thu May 02, 2019 7:55 pm

I assumed VIC-20 is complete, I was wrong:

https://github.com/gyurco/VIC20_MiST/releases/tag/1.7

The horrible audio distortion is fixed, also @nippur72 rewrote the sound generator. TAP support is added.

User avatar
DrOG
Atari Super Hero
Atari Super Hero
Posts: 670
Joined: Sun Jul 31, 2016 8:23 pm
Location: Gyula, Hungary

Re: Atari 2600 / VIC 20

Postby DrOG » Fri May 03, 2019 4:41 am

THX!!! :cheers: Gonna try it this weekend!

DanyPPC
Atari Super Hero
Atari Super Hero
Posts: 783
Joined: Tue Feb 21, 2017 7:02 am

Re: Atari 2600 / VIC 20

Postby DanyPPC » Fri May 03, 2019 6:15 am

Really great update ! :cheers:

DanyPPC
Atari Super Hero
Atari Super Hero
Posts: 783
Joined: Tue Feb 21, 2017 7:02 am

Re: Atari 2600 / VIC 20

Postby DanyPPC » Fri May 03, 2019 7:55 am

Vic20 core lacks an option like C16/C64 Cores to load a standard kernal, so I have to delete my VIC20 JiffyDOS rom from SD card if I want to load tapes.

Lroby74
Captain Atari
Captain Atari
Posts: 161
Joined: Sun Sep 04, 2016 8:35 pm

Re: Atari 2600 / VIC 20

Postby Lroby74 » Fri May 03, 2019 5:57 pm

DanyPPC wrote:Vic20 core lacks an option like C16/C64 Cores to load a standard kernal, so I have to delete my VIC20 JiffyDOS rom from SD card if I want to load tapes.

ATM, you can rename or move into a subfolder Vic20.rom file when you need to load TAPs :)

User avatar
vebxenon
Atari Super Hero
Atari Super Hero
Posts: 853
Joined: Fri Apr 24, 2015 12:10 pm

Re: Atari 2600 / VIC 20

Postby vebxenon » Tue Jun 04, 2019 12:28 pm

E7 mapper added thanks to Slingshot :D :cheers: :cheers:

https://github.com/mist-devel/mist-bina ... ores/a2600

"E7 - M-Network cart (Bump'n'Jump, Burgertime), use .E7 extension"
Just a computer and videogame lover :)

- Atari Jr 2600 clone
- Atari 7800 Peritel
- Atari XEGS
- Atari Lynx II
- Atari Jaguar
- MiST Board

DanyPPC
Atari Super Hero
Atari Super Hero
Posts: 783
Joined: Tue Feb 21, 2017 7:02 am

Re: Atari 2600 / VIC 20

Postby DanyPPC » Tue Jun 04, 2019 2:11 pm

Burger time don't move ! :shrug:

slingshot
Atari God
Atari God
Posts: 1340
Joined: Mon Aug 06, 2018 3:05 pm

Re: Atari 2600 / VIC 20

Postby slingshot » Tue Jun 04, 2019 5:32 pm

DanyPPC wrote:Burger time don't move ! :shrug:

It needs "B" difficulty setting (same in Stella, so not a core bug).

DanyPPC
Atari Super Hero
Atari Super Hero
Posts: 783
Joined: Tue Feb 21, 2017 7:02 am

Re: Atari 2600 / VIC 20

Postby DanyPPC » Tue Jun 04, 2019 7:04 pm

Ah, ok. You are right :wink:

NML32
Atari Super Hero
Atari Super Hero
Posts: 646
Joined: Tue Mar 11, 2014 1:54 am
Location: USA/Florida

Re: Atari 2600 / VIC 20

Postby NML32 » Tue Jun 04, 2019 8:19 pm

I'm happy to see the Atari 2600 core getting updates. :D


Return to “MiST”

Who is online

Users browsing this forum: No registered users and 5 guests