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 listReceived on 2016-09-25 21:00:02
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