omf Posted November 21, 2015 Share Posted November 21, 2015 im in for one what i would like however is a kit form, im interested in this stuff so would like to build it myself from the parts if possible Link to comment Share on other sites More sharing options...
juice2839 Posted November 21, 2015 Author Share Posted November 21, 2015 im in for one what i would like however is a kit form, im interested in this stuff so would like to build it myself from the parts if possible Keep in mind 50% of the parts used on this pcb are surface mount. I wouldn't have any problems selling one un-assembled but with no warranty or support. Link to comment Share on other sites More sharing options...
128Kgames Posted November 21, 2015 Share Posted November 21, 2015 Composite, RGB or you can plug a F18A into it for VGA. Wait no HDMI? Link to comment Share on other sites More sharing options...
omf Posted November 21, 2015 Share Posted November 21, 2015 Keep in mind 50% of the parts used on this pcb are surface mount. I wouldn't have any problems selling one un-assembled but with no warranty or support. surface mount could be an issue depending on pin spacing i would probably socket everything that can be socketed for future breakage Link to comment Share on other sites More sharing options...
juice2839 Posted November 21, 2015 Author Share Posted November 21, 2015 Wait no HDMI? RGB > HDMI or VGA > HDMI. It's not worth making the board 30% bigger to add HDMI support when you can get and use a converter for fairly cheap and keep the board size and component count down. 1 Link to comment Share on other sites More sharing options...
juice2839 Posted November 22, 2015 Author Share Posted November 22, 2015 This is probably going to be the final layout and design with composite video being the standard package, but you can plug a pcb into the VDP socket for RGB output optionally. Or a f18A into the socket for VGA output optionally. 2 Link to comment Share on other sites More sharing options...
bradd1978 Posted November 22, 2015 Share Posted November 22, 2015 This is probably going to be the final layout and design with composite video being the standard package, but you can plug a pcb into the VDP socket for RGB output optionally. Or a f18A into the socket for VGA output optionally. Will the PCBs come with a TMS9928 in the VDP socket? Link to comment Share on other sites More sharing options...
juice2839 Posted November 22, 2015 Author Share Posted November 22, 2015 Will the PCBs come with a TMS9928 in the VDP socket? It would be a TMS9918 installed for composite video. Link to comment Share on other sites More sharing options...
bradd1978 Posted November 22, 2015 Share Posted November 22, 2015 It would be a TMS9918 installed for composite video. Ok makes sense :-) So if I plugged in a TMS9928, are there designated marked locations for the RGB Sync output? Link to comment Share on other sites More sharing options...
omf Posted November 22, 2015 Share Posted November 22, 2015 that's the ntsc chip isn't it, what about uk people like me, could this be replaced with the '29 chip to make pal output? Link to comment Share on other sites More sharing options...
juice2839 Posted November 22, 2015 Author Share Posted November 22, 2015 Ok makes sense :-) So if I plugged in a TMS9928, are there designated marked locations for the RGB Sync output? You'd have to get an optional pcb (which uses a TMA9928) that plugs into the VDP socket on this pcb for RGB. Much like the F18A plugs in. Link to comment Share on other sites More sharing options...
juice2839 Posted November 22, 2015 Author Share Posted November 22, 2015 that's the ntsc chip isn't it, what about uk people like me, could this be replaced with the '29 chip to make pal output? No idea, but I'm sure if I look into it an adapter pcb could be made to plug into the VDP socket. Link to comment Share on other sites More sharing options...
TotOOntHeMooN Posted November 22, 2015 Share Posted November 22, 2015 (edited) Cool work in progress. By the way, I hope that you have not folowed the schematic found on internet, has some errors exist. I can see two holes around the VDP ; Probably to screw a heat sink... The problem is related to the bad way to generate the VDP clock. (better to fix that) Good luck, TotO. Edited November 22, 2015 by TotOOntHeMooN Link to comment Share on other sites More sharing options...
juice2839 Posted November 22, 2015 Author Share Posted November 22, 2015 Cool work in progress. By the way, I hope that you have not folowed the schematic found on internet, has some errors exist. I can see two holes around the VDP ; Probably to screw a heat sink... The problem is related to the bad way to generate the VDP clock. (better to fix that) Good luck, TotO. The 2 holes are to hold a daughter board down to the main pcb in the VDP socket if you are using the RGB daughter board. I made my own schematic of the colecovision. I found several errors in the schematic posted on AA. Link to comment Share on other sites More sharing options...
TotOOntHeMooN Posted November 22, 2015 Share Posted November 22, 2015 (edited) The 2 holes are to hold a daughter board down to the main pcb in the VDP socket if you are using the RGB daughter board. I made my own schematic of the colecovision. I found several errors in the schematic posted on AA. OK, so it is perfect. (I have made my own too) Edited November 22, 2015 by TotOOntHeMooN Link to comment Share on other sites More sharing options...
juice2839 Posted November 22, 2015 Author Share Posted November 22, 2015 (edited) OK, so it is perfect. (I have made my own too) I did away with the M1 wait circuit as that was wrong in the schematic and also not needed because today the memory is plenty fast enough. I also used a 3.58mhz clock instead of the extra divide by 2 circuit. I streamlined other areas as well like using a CPLD for most of the address decoding and running the SGM clone section of the audio. Some other features include a header for 8 bit I/O and another header with 3 I/O ports mapped. I hope to offer a speech synthiser module, keyboard interface module and maybe a wireless controller module that plugs right to this pcb. Edited November 22, 2015 by juice2839 Link to comment Share on other sites More sharing options...
TotOOntHeMooN Posted November 22, 2015 Share Posted November 22, 2015 Nice. I done close the same, using my own clock and CPLD for address decoding and SGM compatibility too. Link to comment Share on other sites More sharing options...
juice2839 Posted November 22, 2015 Author Share Posted November 22, 2015 Nice. I done close the same, using my own clock and CPLD for address decoding and SGM compatibility too. Cool. What did you use for video? and for video ram? Link to comment Share on other sites More sharing options...
TotOOntHeMooN Posted November 22, 2015 Share Posted November 22, 2015 (edited) See your MP, to avoid the offtopic on your project. Edited November 22, 2015 by TotOOntHeMooN Link to comment Share on other sites More sharing options...
Jinks Posted November 26, 2015 Share Posted November 26, 2015 Here is a dumb question.. How is it all powered. Would be nice to not use the pos psu that the original colecos have. Link to comment Share on other sites More sharing options...
Kamshaft Posted November 26, 2015 Share Posted November 26, 2015 Here is a dumb question.. How is it all powered. Would be nice to not use the pos psu that the original colecos have. If I remember correctly juice said it would use a generic power supply. Assuming 5V or 12V. Link to comment Share on other sites More sharing options...
panzeroceania Posted December 1, 2015 Share Posted December 1, 2015 Rgb AND vga compatibility!!!! Be still my beating heart Link to comment Share on other sites More sharing options...
cbmeeks Posted January 5, 2016 Share Posted January 5, 2016 Any updates on this? Also, how are you generating video? Is a TMS chip or F18 solution required or have you implemented something else? Thanks Link to comment Share on other sites More sharing options...
juice2839 Posted January 5, 2016 Author Share Posted January 5, 2016 (edited) Any updates on this? Also, how are you generating video? Is a TMS chip or F18 solution required or have you implemented something else? Thanks This is coming. We are working out a few more details, but hope to have these out soon. I've been working on the SGM clone first to help finance this new motherboard. Edited January 5, 2016 by juice2839 1 Link to comment Share on other sites More sharing options...
cbmeeks Posted January 5, 2016 Share Posted January 5, 2016 Awesome. But I am mostly curious about the TMS chip. Will I need to supply my own? Thanks Link to comment Share on other sites More sharing options...
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