Another way of approaching this may be to have the FPGA stand-in for the 6545 and grab the video data directly? Some inspiration: https://github.com/EisernSchild/MC6845 https://github.com/schlae/graphics-gremlin/blob/main/verilog/crtc6845.v https://opencores.org/websvn/filedetails?repname=System09&path=%2FSystem09%2Ftrunk%2Frtl%2FVHDL%2Fcrtc6845.vhd On Wed, 3 Nov 2021 at 19:44, <didier_at_aida.org> wrote: > I'm on a project to convert the signal from video connnector of a cbm > 8032 into a vga or hdmi signal > > the idea is to use a fpga MAX10 or ICE40UP5k to grab the commodore > video signal and convert it into a vga or hdmi > actually I'm producing the vga signal and I'm trying to grab the cbm signal > > I'm looking for these informations... > the pixel clock > the total count of pixels clock on a line > the count of visible pixels on a line > the width of the horizontal synchro (in pixel clocks) > the count of pixel clocks in the horizontal front portch > the count of pixel clocks in the horizontal back portch > the horizontal synchro polarity > > the total count of lines in the screen > the count of visible lines > the width of the vertical synchro > the count of lines in the vertical front portch > the count of lines in the vertical back portch > the vertical synchro polarity > > > to do this conversion I use an internal ram in the fpga for a 640x200 > pixels screen > the conversion to hdmi is done with a PMOD to HDMI adapter using a texas > chip... > > the idea is to be compatible with all the cbm and cbm II > I'm developping on a DE10-Lite board but I'll move the final version to > a icebreaker board + pmod to hdmi adapter > > I checked serveral sources from zimmers and Steve's data form the CRTC > but till know it's not so clear... > if you have any idea ? > > thanks >Received on 2021-11-03 11:05:06
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