Re: PET 50Hz editor ROMS

From: Rob Clarke <crock_at_clarke-family.org.uk>
Date: Sun, 27 Apr 2014 17:32:56 +0200
Message-ID: <535D2328.1010101@clarke-family.org.uk>
OK, here's a text version. The xls contains the formulas for working out 
the frequencies and frame rates. How about an open format like ODS, will 
that do?

http://inchocks.co.uk/commodore/PET/PET_CRTC.csv

Rob

On 27/04/2014 17:00, William Levak wrote:
>
>
> I can't read xls.  Can you print it to a text file?
>
>
> On Sat, 26 Apr 2014, Rob Clarke wrote:
>
>> Hi William,
>>
>> I collected all the CRTC values from known ROM's into a spreadsheet, 
>> you can find it here.
>>
>> http://inchocks.co.uk/commodore/PET/PET_CRTC.xls
>>
>> The one in the first column is row 8 on the sheet, which also gives 
>> you a 50hz display but as you say, with slightly adjusted geometry.
>>
>> Rob
>>
>> On 26/04/2014 07:13, William Levak wrote:
>>>
>>> On zimmers.net under PET firmware there 3 separate images for the 
>>> 901474-04 50Hz screen editor ROM. I have compared them and found 
>>> only a few differences.  The affected region is listed below.  The 
>>> three columns below are the three different ROMs in the same order 
>>> they are listed on zimmers.net.
>>>
>>> $E787 is the ROM checksum.
>>>
>>> The other data almost looks like random garbage, but it has a 
>>> pattern.  It took me a while to remember where I had seen that 
>>> pattern.  They are the register values for the CRTC.
>>>
>>> According to my CRTC notes, the last column is values for an 
>>> external PAL monitor.  The middle column is values for a 50 Hz 
>>> internal monitor.
>>> I don't recognize the values in the first column.  They are almost 
>>> like the 60 Hz internal monitor, but the vertical spacing is different.
>>>
>>>
>>> E72A:  31  32  3F
>>> E72B:  28  28  28
>>> E72C:  29  28  32
>>> E72D:  0F  08  08
>>> E72E:  27  26  20
>>> E72F:  00  02  10
>>> E730:  19  19  19
>>> E731:  20  20  1D
>>> E732:  00  00  00
>>> E733:  09  09  08
>>> E734:  00  00  00
>>> E735:  00  00  00
>>> E736:  10  10  10
>>> E737:  00  00  00
>>> E738:  00  00  00
>>> E739:  00  00  00
>>> E73A:  00  00  00
>>> E73B:  00  00  00
>>>
>>> E73C:  31  32  3F
>>> E73D:  28  28  28
>>> E73E:  29  28  32
>>> E73F:  0F  08  08
>>> E740:  31  30  24
>>> E741:  00  00  11
>>> E742:  19  19  19
>>> E743:  25  25  20
>>> E744:  00  00  00
>>> E745:  07  07  07
>>> E746:  00  00  00
>>> E747:  00  00  00
>>> E748:  10  10  10
>>> E749:  00  00  00
>>> E74A:  00  00  00
>>> E74B:  00  00  00
>>> E74C:  00  00  00
>>> E74D:  00  00  00
>>>
>>> E787:  BF  CD  BF
>>>
>>>
>>>
>>> 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 2014-04-27 16:03:13

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