Re: Re: Re: PET video to VGA

I had a try, yesterday evening with this hacked ROM. Results, even if still imperfect, are usable and are the best ones I could have until now. In détails :

 

[Note : no shielded cables in my test]

(Analogic) SCART/Composite video with "normal" 6540ROM adapter : Had a stable B&W display, really too much shifted to the upper left, with something as big snow. Not really usable. [and somewhat out of what I wish, a VGA display, not a TV display]

(pure digital) VGA/GB8220/Direct 7402 pin 4 output on 6540ROM adapter : Had a "mostly stable" green display, shifted to the right but I can manage changing GB8220 setup. In "mostly", I mean GB8220 seems to loose sync once every 5 second but recover very fast. While this is not the ideal setting, this is suficient to allow me to peek & poke to 6545 registers, trying to find the right values. I'm comparing PET's video output with C128's RGBI output as a reference.

Keyboard maps to QWERTY but that's okay.

... Could not obtain anything with SCART using Steve's editor ROM ... "No signal" !


Does anyone knows :
- What are registers values supposed to be OK ?
- Locations, in this hacked ROM, to patch to change those registers values ?

Regards


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========================================

Message du : 18/12/2013 18:08
De : "Rob Clarke " <crock@clarke-family.org.uk>
A : cbm-hackers@musoftware.de
Copie à : 
Sujet : Re: Re: PET video to VGA


If it helps you, one of the edit ROM's Zimmers already has the CRTC 
already set for 15.625 khz horizontal. I know this is PAL timing but 
possibly a step in the right direction.

That one is: 
http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/edit-4-80-b-50Hz.901474-04_.bin

cheers, Rob

On 18/12/2013 17:36, Steve Gray wrote:
> I'm in the middle of working on my editrom project, but hopefully I
> could build whatever combination of screen, timing and keyboard you
> need. Are you using a French keyboard or standard B? I haven't looked
> at the French edit rom binaries yet.
> 
> I have other edit rom request to fill as well... so little time.
> 
> Steve
> 
> FROM: "hwarin@neuf.fr" 
> TO: cbm-hackers@musoftware.de
> SENT: Wednesday, December 18, 2013 11:13:22 AM
> SUBJECT: Re: Re: PET video to VGA
> 
> Anders,
> I had forgotten to try this ... Direct 6540ROM to Scart using Steve's
> editor ... Not the ideal solution in my mind but simplier ...
> Thanks
> 
> Tous vos emails en 1 clic avec l'application SFR Mail sur iPhone et
> Android - En savoir plus [1].
> 
> ========================================
> 
> Message du : 18/12/2013 17:01
> De : "Anders Carlsson " 
> A : cbm-hackers@musoftware.de
> Copie à :
> Sujet : Re: PET video to VGA
> 
> Steve Gray wrote:
> 
>> Ok, so if you have the right NTSC signal you will need to adapt the
> rest
>> of the stuff to work on VGA.
> 
> If Hervé uses his LCD TV with SCART input, he probably can stop at
> this
> point as just about every (?) European TV set will accept NTSC
> composite
> video, at least in monochrome. Since the PET in default form doesn't
> output
> any colours anyway, going through conversion to RGB or VGA would be
> plain
> overkill unless considered an exercise. Probably the GB8220 converter
> could
> be used as a scan doubler if the desire still is to get a 31 kHz
> signal.
> 
> Best regards
> 
> Anders Carlsson
> 
> Message was sent through the cbm-hackers mailing list
> 
> 
> 
> Links:
> ------
> [1]
> http://www.sfr.fr/telephonie-mobile/services-options/services-smartphones/applications-sfr/sfr-mail/android?sfrintid=M_email_signature

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