I posted a few teaser pics on the TMS9918 thread last night of Donkey Kong outputting the playfield graphics on the RC2014 (also attached here).
I spent several hours yesterday researching what it would take:
- Challenge #3: interrupts. Donkey Kong hangs after drawing the play field. I believe this is because the ColecoVision had the TMS9918 video interrupt wired up to the Z80's NMI, rather than INT, as was more common, and I as I have done on my card. Most other games don't even get this far. The only other one I found that would display any graphics was Zaxxon. A hardware solution would be to add a jumper to my card that allows selecting NMI or INT for the interrupt output. However, I'm not really keen to do another hardware rev already, and that's assuming I could even find space for another jumper, which I'm not sure I could.
Just a quick look at the colecovision schematic but it looks like the /int line is not used. So would it be possible to just use /int instead of /nmi?
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It’s available now for you to manufacture yourself. I am not planning to sell it, ever. I make plenty of money at my dayjob and running a side business for pocket change is not my idea of a good time. There are links to the board files and a list of parts in the readme. Also if you look back through the TMS9918 thread, several other people were having them made, and a guy said he was going to offer kits. You may be able to buy from one of them. You will probably also want my z80ctrl board. I guess strictly speaking it’s not required but it makes tinkering a lot easier. Just to set your expectations, this is very much at a stage where you will need to be willing to tinker and figure things out yourself. It’s not playable yet and it may never be. If you build the board expecting to play games on it from day one, you’ll be disappointed.
On Fri, Jul 6, 2018 at 6:55 AM karlab wrote:
Very Nice demo.--When will the video card be available?And what other cards are needed to run Coleco games?karl
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Reminds me of the IBM PC Jr motherboard from all those years ago... I never saw one that did not have all those patch cables, and some of those ones where not even needed 😊
Sent from Mail for Windows 10
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