Re: composite on 8032...

From: didier derny <didier_at_aida.org>
Date: Sun, 25 Sep 2016 22:01:35 +0200
Message-ID: <8f62943e-96e1-148c-e23a-0e726b236fe6@aida.org>
Hi,

partly solved with Steve's rom builder kit

I had to fix the vertical parameters to get a full image


thanks



On 25/09/2016 18:21, William Levak wrote:
>
>
> According to my notes, the CRTC settings for a 50Hz PAL monitor are:
>
> Business mode
>   63, 40, 50, 8, 32, 16, 25, 29, 0, 8, 0, 0, 16, 0, 0, 0, 0, 0
>
> Graphic mode
>   63, 40, 50, 8, 36, 17, 25, 32, 0, 7, 0, 0, 16, 0, 0, 0, 0, 0
>
> register 2 is the horizontal sync position.
> register 3 lower 4 bits are the horizontal sync width.
> You start counting registers at 0, so registers 2 and 3 contain 50 and 8.
> Adjusting these registers will affect the horizontal position of your 
> text
> on the screen.
>
> If this does not fix it, then there is too much capacitance on your 
> horizontal sync circuit, or there is too much delay in the circuit.
>
> On Wed, 14 Sep 2016, didier derny wrote:
>
>> Hi,
>>
>> I tried, with a large range of capacitor...
>> I get roughly 2 cases
>>
>> 1/ the image is unstable...
>> 2/ the image is stable
>>     but when the image is stable, I always have 6/7 columns missing 
>> on the left...
>>    the value of the capacitor does not change the number of missing 
>> characters...
>>
>> all the converted I tried have the same problem with the same number 
>> of columns missing
>>
>> On 14/09/2016 05:06, William Levak wrote:
>>>
>>> You need to change the capacitor on your hoizontal sweep frequency.
>>>
>>>
>>> On Fri, 9 Sep 2016, didier derny wrote:
>>>
>>>> I tried to get a composite signal
>>>>
>>>> with this schematics: 
>>>> http://www.6502.org/users/andre/hwinfo/crtc/comp_pucoe_v1.0c-sch.png
>>>> and this rom: edit-4-80-b-50Hz.901474-04_.bin 
>>>> <http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/edit-4-80-b-50Hz.901474-04_.bin>
>>>>
>>>> I get an image a little bit blurry, but a part is missing
>>>> I only see:
>>>> MODORE BASIC 4.0 ***
>>>> BYTES FREE
>>>>
>>>> this part is missing:
>>>> *** COM
>>>> 31743
>>>>
>>>> any idea to get the rest ?  I used the right rom ?
>>>> I choosed it from an excel file I found on the web
>>>>
>>>> thanks
>>>>
>>>> -- 
>>>> didier
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>> wlevak@sdf.lonestar.org
>>> SDF Public Access UNIX System - http://sdf.lonestar.org
>>>
>>>       Message was sent through the cbm-hackers mailing list
>>
>>
>>      Message was sent through the cbm-hackers mailing list
>>
>
> wlevak@sdf.lonestar.org
> SDF Public Access UNIX System - http://sdf.lonestar.org
>
>       Message was sent through the cbm-hackers mailing list


       Message was sent through the cbm-hackers mailing list
Received on 2016-09-25 21:00:02

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